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EDITORIALS AND ANNOUNCEMENTS

Editorial: Eight Journals Introduce Letters

Michael Thoennessen

Phys. Rev. Research 3, 010001 (2021) - Published 9 March, 2021

HIGHLIGHTED ARTICLES

Acceleration of tissue maturation by mechanotransduction-based bioprinting

Ashkan Shafiee, Jareer Kassis, Anthony Atala, and Elham Ghadiri

Phys. Rev. Research 3, 013008 (2021) - Published 5 January, 2021

The authors explore the impact of mechanotransduction on cellular self-assembly in bioprinting process using statistical mechanics and the kinetics of cell adhesion molecules.

Spin and orbital Edelstein effects in a two-dimensional electron gas: Theory and application to SrTiO3 interfaces

Annika Johansson, Börge Göbel, Jürgen Henk, Manuel Bibes, and Ingrid Mertig

Phys. Rev. Research 3, 013275 (2021) - Published 24 March, 2021

The authors study the electrically induced magnetization at SrTiO3 interfaces that originates from nonequilibrium spin and orbital moments.

Full-Bloch beams and ultrafast Rabi-rotating vortices

Lorenzo Dominici, David Colas, Antonio Gianfrate, Amir Rahmani, Vincenzo Ardizzone, Dario Ballarini, Milena De Giorgi, Giuseppe Gigli, Fabrice P. Laussy, Daniele Sanvitto, and Nina Voronova

Phys. Rev. Research 3, 013007 (2021) - Published 5 January, 2021

The authors report a field which simultaneously assumes all the quantum states of its Hilbert space, and show how this induces a topological defect that spans the physical space.

Dissipation engineered directional filter for quantum ratchets

Zlata Fedorova, Christoph Dauer, Anna Sidorenko, Sebastian Eggert, Johann Kroha, and Stefan Linden

Phys. Rev. Research 3, 013260 (2021) - Published 19 March, 2021

The authors investigate how transport rectification is possible in non-adiabatic Hamiltonian quantum ratchets by using a dissipative, dynamic impurity as a direction-dependent filter.

Universal spectral form factor for many-body localization

Abhishodh Prakash, J. H. Pixley, and Manas Kulkarni

Phys. Rev. Research 3, L012019 (2021) - Published 22 February, 2021

The authors study spectral correlations in the many-body-localized phase by computing the spectral form factor for which they obtain an expression and postulate the presence of a universal power-law scaling regime.

LETTERS

Topological Z2 invariant in Kitaev spin liquids: Classification of gapped spin liquids beyond projective symmetry group

Masahiko G. Yamada

Phys. Rev. Research 3, L012001 (2021) - Published 4 January, 2021

This paper proposes a topological insulator phase in the Kitaev model on the square-octagon lattice.

Finding symmetry breaking order parameters with Euclidean neural networks

Tess E. Smidt, Mario Geiger, and Benjamin Kurt Miller

Phys. Rev. Research 3, L012002 (2021) - Published 4 January, 2021

The authors explore using neural networks to elucidate symmetry questions by using Euclidean neural networks to learn the symmetry-breaking input necessary to turn a square into a rectangle.

Magnetic soliton: From two to three components with SO(3) symmetry

Xiao Chai, Di Lao, Kazuya Fujimoto, and Chandra Raman

Phys. Rev. Research 3, L012003 (2021) - Published 6 January, 2021

The authors show that the underlying SO(3) symmetry can unify different types of vector solitons in antiferromagnetic spinor Bose-Einstein condensates experimentally.

Impurity-induced double transitions for accidentally degenerate unconventional pairing states

Bastian Zinkl and Manfred Sigrist

Phys. Rev. Research 3, L012004 (2021) - Published 14 January, 2021

This study demonstrates the splitting of accidental degeneracies of unconventional pairing states under the influence of disorder, which ultimately leads to a superconducting double transition.

Alignment-induced reconfigurable walls for patterning and assembly of liquid crystal skyrmions

Ayhan Duzgun, Avadh Saxena, and Jonathan V. Selinger

Phys. Rev. Research 3, L012005 (2021) - Published 15 January, 2021

The authors propose that precise and programmable control of liquid crystal skyrmions can be achieved by generating attractive and repulsive regions using electric field, surface anchoring, and light.

Anomalous planar Hall effect in two-dimensional trigonal crystals

Raffaele Battilomo, Niccoló Scopigno, and Carmine Ortix

Phys. Rev. Research 3, L012006 (2021) - Published 19 January, 2021

The authors show that an anomalous Planar Hall effect arises in two-dimensional trigonal crystals, and its origin lies in the Berry curvature and Berry curvature dipole of the electronic wave functions.

Orbital mixing at the onset of high-temperature superconductivity in FeSe1xTex/CaF2

K. Nakayama, R. Tsubono, G. N. Phan, F. Nabeshima, N. Shikama, T. Ishikawa, Y. Sakishita, S. Ideta, K. Tanaka, A. Maeda, T. Takahashi, and T. Sato

Phys. Rev. Research 3, L012007 (2021) - Published 20 January, 2021

The authors use angle-resolved photoemission spectroscopy to show distinct electronic structures with different orbital characters between pristine FeSe and high-Tc FeSe1xTex superconductors.

Generation and sustenance of electric fields in sandstorms

Mustafa Mutiur Rahman, Wan Cheng, and Ravi Samtaney

Phys. Rev. Research 3, L012008 (2021) - Published 20 January, 2021

The authors show that turbulence influences the generation of electric fields, whereby differential turbulent transport of charged sand particles leads to the large-scale charge separation required to sustain the electric fields observed in sandstorms.

Disorder-controlled relaxation in a three-dimensional Hubbard model quantum simulator

W. Morong, S. R. Muleady, I. Kimchi, W. Xu, R. M. Nandkishore, A. M. Rey, and B. DeMarco

Phys. Rev. Research 3, L012009 (2021) - Published 27 January, 2021

The authors study the relaxation dynamics of doubly occupied lattice sites in the three-dimensional disordered Fermi-Hubbard model and find a dynamical regime in strong interactions that is characterized by disorder-enhanced relaxation.

Many-body scar state intrinsic to periodically driven system

Sho Sugiura, Tomotaka Kuwahara, and Keiji Saito

Phys. Rev. Research 3, L012010 (2021) - Published 2 February, 2021

The authors construct periodically-driven many-body systems which do not satisfy the Floquet version of eigenstate thermalization hypothesis.

Direct evaluation of measurement uncertainties by feedback compensation of decoherence

Holger F. Hofmann

Phys. Rev. Research 3, L012011 (2021) - Published 3 February, 2021

This paper shows that the precision of a quantum measurement can be determined from the uncompensated amount of decoherence in a probe qubit after the effects of an extremely weak interaction with the system are compensated by a negative feedback determined by the outcomes of the measurement procedure that is being evaluated.

Attosecond photoionization dynamics in the vicinity of the Cooper minima in argon

C. Alexandridi, D. Platzer, L. Barreau, D. Busto, S. Zhong, M. Turconi, L. Neoričić, H. Laurell, C. L. Arnold, A. Borot, J.-F. Hergott, O. Tcherbakoff, M. Lejman, M. Gisselbrecht, E. Lindroth, A. L'Huillier, J. M. Dahlström, and P. Salières

Phys. Rev. Research 3, L012012 (2021) - Published 5 February, 2021

The authors measure the photoionization time delays between the 3s and 3p subshells of argon in the spectral region of the Cooper minima, and compare with theoretical calculations when including overlapping shake-up channels.

High harmonics of the cyclotron resonance in microwave transmission of a high-mobility two-dimensional electron system

M. L. Savchenko, A. Shuvaev, I. A. Dmitriev, A. A. Bykov, A. K. Bakarov, Z. D. Kvon, and A. Pimenov

Phys. Rev. Research 3, L012013 (2021) - Published 5 February, 2021

The authors detect and explore quantum transmittance oscillations, that accompany microwave induced resistance oscillations.

Message-passing approach to epidemic tracing and mitigation with apps

Ginestra Bianconi, Hanlin Sun, Giacomo Rapisardi, and Alex Arenas

Phys. Rev. Research 3, L012014 (2021) - Published 8 February, 2021

The authors propose a message-passing approach to quantify the role of contact tracing apps in mitigating an epidemic wave: increasing the app’s adoption level raises the value of the epidemic threshold, which is eventually maximized when high-degree nodes are preferentially targeted.

Ab initio construction of the energy density functional for electron systems with the functional-renormalization-group-aided density functional theory

Takeru Yokota and Tomoya Naito

Phys. Rev. Research 3, L012015 (2021) - Published 16 February, 2021

This work shows an ab initio construction of the energy density functional for electron systems without any empirical parameter by use of the functional renormalization group formulated for density functional theory.

Out-of-equilibrium steady states of a locally driven lossy qubit array

Shovan Dutta and Nigel R. Cooper

Phys. Rev. Research 3, L012016 (2021) - Published 16 February, 2021

This work shows that localised dissipation in a qubit array can establish long-range coherence and density-wave order in a class of resonant geometries, which can be understood from simple rate equations.

Photon-photon polaritons in χ(2) microresonators

D. V. Skryabin, V. V. Pankratov, A. Villois, and D. N. Puzyrev

Phys. Rev. Research 3, L012017 (2021) - Published 17 February, 2021

This work reports polaritons formed via strong coupling between sidebands of the fundamental and second harmonic, and maps the sequence of parametric thresholds found in a high-Q ring microresonator.

Field-induced charge symmetry revealed by nuclear magnetic resonance in the topological insulator Bi2Te3

R. Guehne, J. Haase, C. Shekhar, and C. Felser

Phys. Rev. Research 3, L012018 (2021) - Published 19 February, 2021

The authors show quadrupole effects in topological insulator Bi2Te3 and explain them on the basis of strongly spin-orbit coupled conduction electrons which rise to a field induced change in charge symmetry.

Universal spectral form factor for many-body localization

Abhishodh Prakash, J. H. Pixley, and Manas Kulkarni

Phys. Rev. Research 3, L012019 (2021) - Published 22 February, 2021

The authors study spectral correlations in the many-body-localized phase by computing the spectral form factor for which they obtain an expression and postulate the presence of a universal power-law scaling regime.

Transition between chaotic and stochastic universality classes of kinetic roughening

Enrique Rodríguez-Fernández and Rodolfo Cuerno

Phys. Rev. Research 3, L012020 (2021) - Published 2 March, 2021

The authors show that the transition between chaos-dominated and stochastic-dominated fluctuations occurs at a non-zero value of the noise strength.

Interaction-induced topological superconductivity in antiferromagnet-superconductor junctions

Senna S. Luntama, Päivi Törmä, and Jose L. Lado

Phys. Rev. Research 3, L012021 (2021) - Published 5 March, 2021

The authors present a mechanism to generate topological superconductivity at the interface between an antiferromagnetic insulator and a superconductor, by showing that electronic interactions create a synthetic spin-orbit coupling in interfacial solitonic states.

Spreading of correlations and entanglement in the long-range transverse Ising chain

J. T. Schneider, J. Despres, S. J. Thomson, L. Tagliacozzo, and L. Sanchez-Palencia

Phys. Rev. Research 3, L012022 (2021) - Published 5 March, 2021

This work analyzes the nonequilibrium dynamics of a long-range quantum system. The authors show that, while the spreading of spin correlations depends crucially on the interaction range, the propagation of entanglement remains almost independent of it.

Diffusion with local resetting and exclusion

Asaf Miron and Shlomi Reuveni

Phys. Rev. Research 3, L012023 (2021) - Published 5 March, 2021

This article introduces the notion of local stochastic resetting in interacting many-body systems and studies its effect on the symmetric simple exclusion process in one dimension.

First order phase transition between two centro-symmetric superradiant crystals

Xiangliang Li, Davide Dreon, Philip Zupancic, Alexander Baumgärtner, Andrea Morales, Wei Zheng, Nigel R. Cooper, Tobias Donner, and Tilman Esslinger

Phys. Rev. Research 3, L012024 (2021) - Published 5 March, 2021

The authors observe a structural phase transition in a crystal spontaneously formed by placing illuminated atoms in an optical cavity. They record the transient dynamics of the order parameter across the phase transition, showing in real-time the change of the crystal polarization.

Experimental tests of multiplicative Bell inequalities and the fundamental role of local correlations

Dilip Paneru, Amit Te'eni, Bar Y. Peled, James Hubble, Yingwen Zhang, Avishy Carmi, Eliahu Cohen, and Ebrahim Karimi

Phys. Rev. Research 3, L012025 (2021) - Published 12 March, 2021

The authors explore the limits of quantum and classical correlations using Multiplicative Bell inequalities, that reveal the interplay between local and non-local correlations.

Writing and deleting skyrmions with electric fields in a multiferroic heterostructure

Chao-Kai Li, Xu-Ping Yao, and Gang Chen

Phys. Rev. Research 3, L012026 (2021) - Published 16 March, 2021

This article shows that in a van der Waals multiferroic heterostructure, the electric field controls the electric polarization and influences the interfacial Dzyaloshinskii-Moriya interaction, resulting in the creation and annihilation of skyrmions.

Droplet under confinement: Competition and coexistence with a soliton bound state

Xiaoling Cui and Yinfeng Ma

Phys. Rev. Research 3, L012027 (2021) - Published 19 March, 2021

The authors show that the confinement-induced boundary effect can destabilize the quantum droplet towards the formation of a soliton bound state that has no density modulation along the confined direction.

Sixfold excitations in electrides

Simin Nie, B. Andrei Bernevig, and Zhijun Wang

Phys. Rev. Research 3, L012028 (2021) - Published 22 March, 2021

The authors identify that the electride Li12Mg3Si4 and its derivatives exhibit a single linear dispersive six-fold excitation, which is formed by the floating bands of elementary band representation.

ARTICLES

Shadowed triplet pairings in Hund's metals with spin-orbit coupling

Jonathan Clepkens, Austin W. Lindquist, and Hae-Young Kee

Phys. Rev. Research 3, 013001 (2021) - Published 4 January, 2021

The authors study the microscopic origin of an even-parity spin-triplet pairing state relevant to multi-orbital materials with large Hund’s and spin-orbit coupling, such as strontium ruthenate.

Bose-Einstein condensate of Dirac magnons: Pumping and collective modes

P. O. Sukhachov, S. Banerjee, and A. V. Balatsky

Phys. Rev. Research 3, 013002 (2021) - Published 4 January, 2021

The authors propose the formation of Bose-Einstein condensate of pumped Dirac magnons and investigate its emergent properties.

Theory of topological spin Josephson junctions

Pei-Xin Shen, Silas Hoffman, and Mircea Trif

Phys. Rev. Research 3, 013003 (2021) - Published 4 January, 2021

The authors find that inhomogeneous quantum spin chains support spin supercurrents that enhance the entanglement between spins and can be detected using conventional dispersive techniques.

Discretized quantum adiabatic process for free fermions and comparison with the imaginary-time evolution

Tomonori Shirakawa, Kazuhiro Seki, and Seiji Yunoki

Phys. Rev. Research 3, 013004 (2021) - Published 4 January, 2021

The authors study the properties of a variational quantum circuit inspired by the quantum adiabatic computation, and their solution for a free fermions.

Surface-plasmon-based dispersive detection and spectroscopy of ultracold atoms

Matthias Mildner, Claus Zimmermann, and Sebastian Slama

Phys. Rev. Research 3, 013005 (2021) - Published 4 January, 2021

The authors dispersively detect ultracold atoms near a gold surface using evanescent waves. The sensitivity of the detection is enhanced by the excitation of surface plasmons.

Quantum illumination receiver using double homodyne detection

Yonggi Jo, Sangkyung Lee, Yong Sup Ihn, Zaeill Kim, and Su-Yong Lee

Phys. Rev. Research 3, 013006 (2021) - Published 4 January, 2021

The authors present a quantum illumination receiver with linear optical elements and analyze its performance in terms of optical parametric amplification.

Full-Bloch beams and ultrafast Rabi-rotating vortices

Lorenzo Dominici, David Colas, Antonio Gianfrate, Amir Rahmani, Vincenzo Ardizzone, Dario Ballarini, Milena De Giorgi, Giuseppe Gigli, Fabrice P. Laussy, Daniele Sanvitto, and Nina Voronova

Phys. Rev. Research 3, 013007 (2021) - Published 5 January, 2021

The authors report a field which simultaneously assumes all the quantum states of its Hilbert space, and show how this induces a topological defect that spans the physical space.

Acceleration of tissue maturation by mechanotransduction-based bioprinting

Ashkan Shafiee, Jareer Kassis, Anthony Atala, and Elham Ghadiri

Phys. Rev. Research 3, 013008 (2021) - Published 5 January, 2021

The authors explore the impact of mechanotransduction on cellular self-assembly in bioprinting process using statistical mechanics and the kinetics of cell adhesion molecules.

Cooperators overcome migration dilemma through synchronization

Shubhadeep Sadhukhan, Rohitashwa Chattopadhyay, and Sagar Chakraborty

Phys. Rev. Research 3, 013009 (2021) - Published 5 January, 2021

This paper shows random migration induced synchronized emergence of cooperation in interconnected subpopulations playing chaotic replication-selection evolutionary games where altruism is mildly incentivized.

Reconfigurable network for quantum transport simulations

Mario A. Quiroz-Juárez, Chenglong You, Javier Carrillo-Martínez, Diego Montiel-Álvarez, José L. Aragón, Omar S. Magaña-Loaiza, and Roberto de J. León-Montiel

Phys. Rev. Research 3, 013010 (2021) - Published 6 January, 2021

This work provides a simulation of one- and two-dimensional quantum transport phenomena using a reconfigurable electronic network.

Getting hotter by heating less: How driven granular materials dissipate energy in excess

A. Plati, L. de Arcangelis, A. Gnoli, E. Lippiello, A. Puglisi, and A. Sarracino

Phys. Rev. Research 3, 013011 (2021) - Published 6 January, 2021

The authors study the competition between external forcing and internal dissipation in vibrated granular media. They uncover a nonmonotonic behavior of the granular kinetic energy as a function of the input energy, which represents an instance of negative specific heat.

Echoes of a squeezed oscillator

R. Merlin and A. Bianchini

Phys. Rev. Research 3, 013012 (2021) - Published 7 January, 2021

The authors show that pulses applied to drive parametrically an inhomogeneously broadened set of squeezed harmonic oscillators result in a spontaneous recovery of coherence that manifests as echoes.

Spectrum of extensive multiclusters in the Kuramoto model with higher-order interactions

Can Xu and Per Sebastian Skardal

Phys. Rev. Research 3, 013013 (2021) - Published 7 January, 2021

The authors present a stability analysis of multicluster states that form in coupled oscillator systems with higher-order interactions in the thermodynamic limit via their spectral properties.

Plasmonic linewidth narrowing by encapsulation in a dispersive absorbing material

Ryan Peck, Ali Khademi, Juanjuan Ren, Stephen Hughes, Alexandre G. Brolo, and Reuven Gordon

Phys. Rev. Research 3, 013014 (2021) - Published 7 January, 2021

The authors show that dispersive loss of the medium surrounding a metal nanoparticle can lead to narrower plasmonic resonances.

Hunting for the non-Hermitian exceptional points with fidelity susceptibility

Yu-Chin Tzeng, Chia-Yi Ju, Guang-Yin Chen, and Wen-Min Huang

Phys. Rev. Research 3, 013015 (2021) - Published 7 January, 2021

The authors generalize the fidelity to the non-Hermitian quantum mechanics using the metric tensor of the Hilbert space, and detect the quantum critical point and the exceptional point using fidelity susceptibility.

Observation of resonant dipolar collisions in ultracold Na23Rb87 rotational mixtures

Junyu He, Xin Ye, Junyu Lin, Mingyang Guo, Goulven Quéméner, and Dajun Wang

Phys. Rev. Research 3, 013016 (2021) - Published 8 January, 2021

The authors present a joint experimental and theoretical investigation on the collisions in rotational mixtures of ultracold bosonic 23Na87Rb molecules which are dictated by strong resonant dipolar interactions, even when external electric fields are absent.

Fast computation of dissipative quantum systems with ensemble rank truncation

Gerard McCaul, Kurt Jacobs, and Denys I. Bondar

Phys. Rev. Research 3, 013017 (2021) - Published 8 January, 2021

This work details a deterministic ensemble method for evolving open quantum systems and compare it with stochastic techniques.

Optical and electrical feedback cooling of a silica nanoparticle levitated in a Paul trap

Lorenzo Dania, Dmitry S. Bykov, Matthias Knoll, Pau Mestres, and Tracy E. Northup

Phys. Rev. Research 3, 013018 (2021) - Published 8 January, 2021

This work studies feedback cooling of the center-of-mass motion of a nanoparticle levitated in a Paul trap. The authors demonstrate temperatures of a few mK for all three motional modes and characterize cooling as function of feedback parameters, background pressure, and the particle’s position.

Evolution of helimagnetic correlations when approaching the quantum critical point of Mn1xFexSi

C. Pappas, A. O. Leonov, L. J. Bannenberg, P. Fouquet, T. Wolf, and F. Weber

Phys. Rev. Research 3, 013019 (2021) - Published 8 January, 2021

The authors study the evolution of helimagnetic correlations and fluctuations in Mn1xFexSi, when approaching a quantum critical concentration and how it is influenced by frustration in chiral magnetism.

Growth laws and invariants from ribosome biogenesis in lower Eukarya

Sarah Kostinski and Shlomi Reuveni

Phys. Rev. Research 3, 013020 (2021) - Published 8 January, 2021

The authors propose a theoretical framework for the growth of unicellular eukaryotes based on kinetics of ribosome biogenesis.

Impact of temperature and mode polarization on the acoustic phonon range in complex crystalline phases: A case study on intermetallic clathrates

S. R. Turner, S. Pailhès, F. Bourdarot, J. Ollivier, S. Raymond, T. Keller, Y. Sidis, J.-P. Castellan, P.-F. Lory, H. Euchner, M. Baitinger, Yu. Grin, H. Schober, M. de Boissieu, and V. M. Giordano

Phys. Rev. Research 3, 013021 (2021) - Published 8 January, 2021

The authors use inelastic neutron scattering to show that the lattice anharmonicity in a single crystal of a complex type-I clathrate structure depends on transverse versus longitudinal phonon polarizations.

Visualizing the multifractal wave functions of a disordered two-dimensional electron gas

Berthold Jäck, Fabian Zinser, Elio J. König, Sune N. P. Wissing, Anke B. Schmidt, Markus Donath, Klaus Kern, and Christian R. Ast

Phys. Rev. Research 3, 013022 (2021) - Published 8 January, 2021

The authors report on the multifractal eigenstate characteristics of a disordered two-dimensional electron gas near the quantum-critical Anderson transition, and show a disorder-induced anomalous wave function scaling in real space.

Minimal model of many-body localization

F. Monteiro, T. Micklitz, Masaki Tezuka, and Alexander Altland

Phys. Rev. Research 3, 013023 (2021) - Published 8 January, 2021

The authors studies a model of many body localization from a weak disorder regime with Fock space extended states to strong disorder localization.

Dark exciton preparation in a quantum dot by a longitudinal light field tuned to higher exciton states

M. Holtkemper, G. F. Quinteiro, D. E. Reiter, and T. Kuhn

Phys. Rev. Research 3, 013024 (2021) - Published 11 January, 2021

The authors propose a scheme to excite the dark exciton ground state in a quantum dot, based on the use of a longitudinally polarized laser pulse to excite an energetically higher exciton state exhibiting a strong mixing of bright and dark spin configurations.

Simulation of topological Zak phase in spin-phononic crystal networks

Xiao-Xiao Li, Peng-Bo Li, Hong-Rong Li, Hong Gao, and Fu-Li Li

Phys. Rev. Research 3, 013025 (2021) - Published 11 January, 2021

The authors propose a periodic driving protocol for engineering the chiral symmetry-protected spin-spin interactions, and present the simulation of one- and two-dimensional topological properties.

Fast entangling gates in long ion chains

Zain Mehdi, Alexander K. Ratcliffe, and Joseph J. Hope

Phys. Rev. Research 3, 013026 (2021) - Published 11 January, 2021

This work presents a protocol for implementing fast two-qubit gates in long trapped-ion chains.

Magnetization textures in twisted bilayer CrX3 (X=Br, I)

Feiping Xiao, Keqiu Chen, and Qingjun Tong

Phys. Rev. Research 3, 013027 (2021) - Published 11 January, 2021

The authors show that the stacking dependent interlayer magnetic interaction can give rise to the nonuniform magnetization textures in the moire pattern of twisted bilayer CrX3 (X=Br,I)

Critical scaling of the ac conductivity and momentum dissipation

Nikolaos Angelinos, Elias Kiritsis, and Francisco Peña-Benitez

Phys. Rev. Research 3, 013028 (2021) - Published 12 January, 2021

The authors study the scaling of the AC conductivity in a strongly-coupled quantum critical system with momentum dissipation in two dimensions at finite density and temperature.

Precision measurement of the muonium hyperfine interaction in mesoporous silica and aerogel

M. H. Dehn, R. Scheuermann, P.-X. Wang, Y. Cao, M. J. MacLachlan, V. M. Zamarion, D. G. Fleming, and R. F. Kiefl

Phys. Rev. Research 3, 013029 (2021) - Published 12 January, 2021

This study uses high-transverse-field muon-spin-rotation experiments to investigate muonium dynamics and surface interaction in mesoporous silica and aerogels.

Spin and lattice dynamics in the two-singlet system Tb3Ga5O12

S. Petit, F. Damay, Q. Berrod, and J. M. Zanotti

Phys. Rev. Research 3, 013030 (2021) - Published 12 January, 2021

The authors reveal the onset of hybridization between crystal field excitations and an acoustic phonon in terbium gallium garnet, as manifested by an intensity anomaly along the phonon dispersion when it crosses the low energy CEF levels.

Quantum effects in the Aubry transition

Pietro Maria Bonetti, Andrea Rucci, Maria Luisa Chiofalo, and Vladan Vuletić

Phys. Rev. Research 3, 013031 (2021) - Published 12 January, 2021

This paper explores the possibility of observing quantum signatures of the sliding-to-pinning Aubry transition in experiments with trapped ultracold Yb-ions chains, interacting via Coulomb forces in optical lattices.

Heterogeneous impact of a lockdown on inter-municipality mobility

Hygor P. M. Melo, João Henriques, Raquel Carvalho, Trivik Verma, João P. da Cruz, and N. A. M. Araújo

Phys. Rev. Research 3, 013032 (2021) - Published 13 January, 2021

The authors show that the impact of a lockdown on intermunicipality mobility is not homogeneous but rather depends strongly on the pre-lockdown outflow.

Nematic topological semimetal and insulator in magic-angle bilayer graphene at charge neutrality

Shang Liu, Eslam Khalaf, Jong Yeon Lee, and Ashvin Vishwanath

Phys. Rev. Research 3, 013033 (2021) - Published 12 January, 2021

This work explores the possible interacting ground states of magic angle twisted bilayer graphene at charge neutrality, emphasizing the role of three-fold lattice rotation symmetry.

Machine-learning engineering of quantum currents

Tobias Haug, Rainer Dumke, Leong-Chuan Kwek, Christian Miniatura, and Luigi Amico

Phys. Rev. Research 3, 013034 (2021) - Published 12 January, 2021

The authors propose to use deep reinforcement learning to engineer quantum currents by driving cold atom circuits in time.

Goldstino spectrum in an ultracold Bose-Fermi mixture with explicitly broken supersymmetry

Hiroyuki Tajima, Yoshimasa Hidaka, and Daisuke Satow

Phys. Rev. Research 3, 013035 (2021) - Published 12 January, 2021

The authors study the Goldstino mode in ultracold Bose-Fermi mixtures and derive a formula for explicit supersymmetry breaking.

Circuit-QED with phase-biased Josephson weak links

C. Metzger, Sunghun Park, L. Tosi, C. Janvier, A. A. Reynoso, M. F. Goffman, C. Urbina, A. Levy Yeyati, and H. Pothier

Phys. Rev. Research 3, 013036 (2021) - Published 12 January, 2021

This article describes how to evaluate the response of a microwave resonator coupled to a superconducting weak link, and how transitions are induced by phase or electric field microwave drives.

Theory of Fano effect in cavity quantum electrodynamics

Makoto Yamaguchi, Alexey Lyasota, and Tatsuro Yuge

Phys. Rev. Research 3, 013037 (2021) - Published 13 January, 2021

This work provides a theory of the Fano effect in cavity quantum electrodynamics, which can generalize the Fano formula over the weak and strong coupling regimes with pure dephasing.

Calculation of the Green's function in the scattering region for first-principles electron-transport simulations

Yoshiyuki Egami, Shigeru Tsukamoto, and Tomoya Ono

Phys. Rev. Research 3, 013038 (2021) - Published 14 January, 2021

The authors propose a first-principles algorithm for calculating the Green’s function to evaluate electron-transport properties.

Shallow-circuit variational quantum eigensolver based on symmetry-inspired Hilbert space partitioning for quantum chemical calculations

Feng Zhang, Niladri Gomes, Noah F. Berthusen, Peter P. Orth, Cai-Zhuang Wang, Kai-Ming Ho, and Yong-Xin Yao

Phys. Rev. Research 3, 013039 (2021) - Published 13 January, 2021

The authors report a graph-clustering algorithm for partitioning the Hilbert space associated with a qubit Hamiltonian.

Crystalline gauge fields and quantized discrete geometric response for Abelian topological phases with lattice symmetry

Naren Manjunath and Maissam Barkeshli

Phys. Rev. Research 3, 013040 (2021) - Published 13 January, 2021

The authors develop a topological field theory of crystalline gauge fields, which they use to classify the fractional charge, angular momentum, and linear momentum of anyons and lattice defects in (2+1)D topologically ordered phases of matter.

Solving frustrated Ising models using tensor networks

Bram Vanhecke, Jeanne Colbois, Laurens Vanderstraeten, Frank Verstraete, and Frédéric Mila

Phys. Rev. Research 3, 013041 (2021) - Published 13 January, 2021

The authors show how to combine coarse graining and tensor networks to calculate the residual entropy of frustrated Ising models who do not have an obvious local rule.

Spin-orbit torques originating from the bulk and interface in Pt-based structures

Hiroki Hayashi, Akira Musha, Hiroto Sakimura, and Kazuya Ando

Phys. Rev. Research 3, 013042 (2021) - Published 13 January, 2021

The authors show that the origin of the spin-orbit torques in ferromagnetic-metal/Pt heterostructures are strongly dependent on the choice of the ferromagnetic layer.

Braiding with magnetic octupoles

Thomas Lachner, Daniel de las Heras, and Thomas M. Fischer

Phys. Rev. Research 3, 013043 (2021) - Published 13 January, 2021

The authors show the exchange of two identical magnetic octupoles above a magnetic pattern using a single, homogeneous driving field.

High-resolution spectroscopy of a quantum dot driven bichromatically by two strong coherent fields

Chris Gustin, Lukas Hanschke, Katarina Boos, Jonathan R. A. Müller, Malte Kremser, Jonathan J. Finley, Stephen Hughes, and Kai Müller

Phys. Rev. Research 3, 013044 (2021) - Published 14 January, 2021

The authors present high resolution spectroscopic measurements and theoretical calculations of a quantum dot driven by two strong coherent lasers, to show a set of Floquet resonances with applications in spectral engineering.

Positive- and negative-frequency noise from an ensemble of two-level fluctuators

Xinyuan You, Aashish A. Clerk, and Jens Koch

Phys. Rev. Research 3, 013045 (2021) - Published 14 January, 2021

This paper presents an analysis of charge noise due to an ensemble of thermalized two-level fluctuators.

Observation of shock-induced protein crystal damage during megahertz serial femtosecond crystallography

Marie L. Grünbein et al.

Phys. Rev. Research 3, 013046 (2021) - Published 15 January, 2021

The authors show that shock waves launched in liquid microjets by X-ray laser pulses can damage protein crystals, affecting crystallography data collected at megahertz rates.

Continuous-variable quantum cryptography with discrete alphabets: Composable security under collective Gaussian attacks

Panagiotis Papanastasiou and Stefano Pirandola

Phys. Rev. Research 3, 013047 (2021) - Published 14 January, 2021

The authors investigate the effects of using trusted noise and a finite number of signals for a discrete alphabet CV-QKD protocol assuming collective attacks in a composable framework.

Large-scale thermalization, prethermalization, and impact of temperature in the quench dynamics of two unequal Luttinger liquids

Paola Ruggiero, Laura Foini, and Thierry Giamarchi

Phys. Rev. Research 3, 013048 (2021) - Published 14 January, 2021

The work studies the dynamics following a quench in the tunneling between two different interacting Bose gases which are initially coupled. The authors highlight the quasi-thermal behaviour occurring at large times in the large distance regime, and its limit of validity.

Composite particles with minimum uncertainty in spacetime

Carolyn E. Wood and Magdalena Zych

Phys. Rev. Research 3, 013049 (2021) - Published 15 January, 2021

The authors introduce a class of states with minimum uncertainty in position and velocity that fully overcome delocalization in propagating composite particles.

Heat evacuation from active Raman media using frequency-selective dissipative coupling

Galina Nemova and Christophe Caloz

Phys. Rev. Research 3, 013050 (2021) - Published 15 January, 2021

The authors show how frequency-selective dissipative coupling can prevent reversed coherent anti-Stokes Raman scattering cycles, which generate heat in active phase-mismatched Raman media.

Spin-polarized superconductivity: Order parameter topology, current dissipation, and multiple-period Josephson effect

Eyal Cornfeld, Mark S. Rudner, and Erez Berg

Phys. Rev. Research 3, 013051 (2021) - Published 15 January, 2021

The authors propose a relaxation mechanism in spin-polarized two-dimensional triplet superconductors which does not require the creation of vortices. When a voltage is applied to the system, this mechanism leads to an anomalous alternating-current Josephson effect.

Tenfold topology of crystals: Unified classification of crystalline topological insulators and superconductors

Eyal Cornfeld and Shachar Carmeli

Phys. Rev. Research 3, 013052 (2021) - Published 15 January, 2021

The authors provide a classification of crystalline topological phases that captures anomalous surface states undetected by symmetry indicators.

Confinement-induced columnar crystals of ellipses

Weiwei Jin (金炜炜), Yuqian Wang (王昱乾), Ho-Kei Chan (陈浩基), and Zheng Zhong (仲政)

Phys. Rev. Research 3, 013053 (2021) - Published 19 January, 2021

The authors study confinement-induced columnar crystals of ellipses to show that any such structure is an affine transformation of a particular densest-packed structure of circular disks.

Universal scattering phase shift in the presence of spin-orbit coupling

Cai-Xia Zhang and Shi-Guo Peng

Phys. Rev. Research 3, 013054 (2021) - Published 19 January, 2021

The authors develop a unified description of scattering phase shifts between two cold atoms in the presence of spin-orbit coupling, which is independent of the short-range details of interatomic potentials.

Modeling protein target search in human chromosomes

Markus Nyberg, Tobias Ambjörnsson, Per Stenberg, and Ludvig Lizana

Phys. Rev. Research 3, 013055 (2021) - Published 19 January, 2021

The authors find that DNA regions with many gene starts are easy to find. To show this, they take advantage of measured DNA-DNA contact networks and develop a reaction-diffusion model that they solve analytically.

Disentangling supercohomology symmetry-protected topological phases in three spatial dimensions

Yu-An Chen, Tyler D. Ellison, and Nathanan Tantivasadakarn

Phys. Rev. Research 3, 013056 (2021) - Published 19 January, 2021

The authors use a series of lattice dualities to build exactly solvable models for supercohomology symmetry-protected topological phases in (3+1)-dimensions. They also construct gapped topologically ordered boundaries for the fermionic models by extending the global symmetry.

Crowdsourcing human common sense for quantum control

Jesper Hasseriis Mohr Jensen, Miroslav Gajdacz, Shaeema Zaman Ahmed, Jakub Herman Czarkowski, Carrie Weidner, Janet Rafner, Jens Jakob Sørensen, Klaus Mølmer, and Jacob Friis Sherson

Phys. Rev. Research 3, 013057 (2021) - Published 19 January, 2021

The authors explore nonexpert citizen contributions for solving a suite of quantum optimal control problems. Their input is gathered through a game where they produce and subsequently improve solutions using an in-game local optimization algorithm.

Universal quantization of the magnetic susceptibility jump at a topological phase transition

Soshun Ozaki and Masao Ogata

Phys. Rev. Research 3, 013058 (2021) - Published 19 January, 2021

This work studies the magnetic susceptibility of two-dimensional spin-conserving topological insulators. The authors show that the susceptibility jump occurs at a topological phase transition.

Performance evaluation of the discrete truncated Wigner approximation for quench dynamics of quantum spin systems with long-range interactions

Masaya Kunimi, Kazuma Nagao, Shimpei Goto, and Ippei Danshita

Phys. Rev. Research 3, 013060 (2021) - Published 19 January, 2021

The authors study a validity timescale of the discrete truncated Wigner approximation for several quantum-spin systems with long-range interactions of step-function form by using the Bogoliubov-Born-Green-Kirkwood-Yvon equation.

Fluctuation distributions of energy minima in complex landscapes

Horst-Holger Boltz, Jorge Kurchan, and Andrea J. Liu

Phys. Rev. Research 3, 013061 (2021) - Published 19 January, 2021

This paper explores the fluctuation distributions of energy found via gradient descent in complex landscapes present in constraint satisfaction problems.

Casimir forces on deformed fermionic chains

Begoña Mula, Silvia N. Santalla, and Javier Rodríguez-Laguna

Phys. Rev. Research 3, 013062 (2021) - Published 20 January, 2021

The paper shows that Casimir forces on an obstacle mimic the gravitational pull in the Dirac 1+1D vacuum.

Quantum state discrimination using noisy quantum neural networks

Andrew Patterson, Hongxiang Chen, Leonard Wossnig, Simone Severini, Dan Browne, and Ivan Rungger

Phys. Rev. Research 3, 013063 (2021) - Published 20 January, 2021

This paper investigates the effect of noise on a quantum neural network circuit. The authors demonstrate a circuit to perform the task of state discrimination which is robust to this level of noise.

Inertial Theorem: Overcoming the quantum adiabatic limit

Roie Dann and Ronnie Kosloff

Phys. Rev. Research 3, 013064 (2021) - Published 21 January, 2021

The inertrial theorem allows description of nonadiabatic dynamics of strongly driven quantum systems. This leads to a family of rapid control protocols for closed and open systems.

Pseudo-BCS wave function from density matrix decomposition: Application in auxiliary-field quantum Monte Carlo

Zhi-Yu Xiao, Hao Shi, and Shiwei Zhang

Phys. Rev. Research 3, 013065 (2021) - Published 21 January, 2021

This work introduces a method for constructing pseudo-BCS wave functions from the one-body density matrix and apply it as a self- consistent reference state in auxiliary-field quantum Monte Carlo.

Topological orders competing for the Dirac surface state in FeSeTe surfaces

Xianxin Wu, Suk Bum Chung, Chaoxing Liu, and Eun-Ah Kim

Phys. Rev. Research 3, 013066 (2021) - Published 21 January, 2021

The authors propose a mechanism to explain that the Majorana zero mode will be absent in some vortices on surfaces and their fraction increases with an increasing magnetic field in Fe(Te,Se).

Displacement autocorrelation functions for strong anomalous diffusion: A scaling form, universal behavior, and corrections to scaling

Jürgen Vollmer, Lamberto Rondoni, Muhammad Tayyab, Claudio Giberti, and Carlos Mejía-Monasterio

Phys. Rev. Research 3, 013067 (2021) - Published 21 January, 2021

The authors study the moments and the autocorrelation functions of displacement in systems showing strong anomalous diffusion.

Scalable multimode entanglement based on efficient squeezing of propagation eigenmodes

David Barral, Kamel Bencheikh, Juan Ariel Levenson, and Nadia Belabas

Phys. Rev. Research 3, 013068 (2021) - Published 21 January, 2021

The authors propose an array of nonlinear waveguides to produce quadrature entanglement over a wide range of number of spatial modes.

Prediction of tunable spin-orbit gapped materials for dark matter detection

Katherine Inzani, Alireza Faghaninia, and Sinéad M. Griffin

Phys. Rev. Research 3, 013069 (2021) - Published 21 January, 2021

The authors propose spin-orbit gapped semiconductors as low-mass dark matter targets, based on their tunable electronic properties.

Neutral theory for competing attention in social networks

Carlos A. Plata, Emanuele Pigani, Sandro Azaele, Violeta Calleja-Solanas, María J. Palazzi, Albert Solé-Ribalta, Javier Borge-Holthoefer, Sandro Meloni, and Samir Suweis

Phys. Rev. Research 3, 013070 (2021) - Published 22 January, 2021

The authors provide a stochastic theoretical framework to study the coexistence of different memes competing for the limited users’ attention in online social networks and explaining related emergent patterns in Twitter data-streams.

Exciton energy spectra in polyyne chains

Stella Kutrovskaya, Sevak Demirchyan, Anton Osipov, Stepan Baryshev, Anton Zasedatelev, Pavlos Lagoudakis, and Alexey Kavokin

Phys. Rev. Research 3, 013071 (2021) - Published 22 January, 2021

The paper calculates the binding energies of direct and indirect excitons and trions in linear monoatomic carbon chains and compare them to the experimentally detected fine structure of low temperature photoluminescence spectra.

Circular polariton currents with integer and fractional orbital angular momenta

E. S. Sedov, V. A. Lukoshkin, V. K. Kalevich, P. G. Savvidis, and A. V. Kavokin

Phys. Rev. Research 3, 013072 (2021) - Published 22 January, 2021

The authors suggest that circular superfluid currents in polariton condensates may carry both integer and fractional average angular momenta, while their winding numbers or topological charges always remain integer.

Scale-free behavior in hailstone sequences generated by the Collatz map

M. G. E. da Luz, D. M. G. dos Santos, E. P. Raposo, and G. M. Viswanathan

Phys. Rev. Research 3, 013073 (2021) - Published 22 January, 2021

The authors study the onset of scale-invariant behavior in the Collatz’s map orbit.

Unsupervised learning of topological phase transitions using the Calinski-Harabaz index

Jielin Wang, Wanzhou Zhang, Tian Hua, and Tzu-Chieh Wei

Phys. Rev. Research 3, 013074 (2021) - Published 22 January, 2021

The authors propose a framework to deal with unsupervised machine learning of both topological phases and non-topological ones. From this, the Calinski-Harabaz index score can be used to probe phase transitions.

First passage time distribution of active thermal particles in potentials

Benjamin Walter, Gunnar Pruessner, and Guillaume Salbreux

Phys. Rev. Research 3, 013075 (2021) - Published 22 January, 2021

This article describes a method to compute the statistics of the time a randomly moving, active particle takes to reach a certain point for the first time.

Security proof of practical quantum key distribution with detection-efficiency mismatch

Yanbao Zhang, Patrick J. Coles, Adam Winick, Jie Lin, and Norbert Lütkenhaus

Phys. Rev. Research 3, 013076 (2021) - Published 25 January, 2021

The authors perform a security analysis introducing flag-state squashers in order to reduce quantum mechanical dimensions in a quantum optical communication setting.

Quantum reservoir computing with a single nonlinear oscillator

L. C. G. Govia, G. J. Ribeill, G. E. Rowlands, H. K. Krovi, and T. A. Ohki

Phys. Rev. Research 3, 013077 (2021) - Published 25 January, 2021

The authors show the performance of reservoir computing with a quantum nonlinear oscillator and discuss it in terms of the intrinsic nonlinearity of quantum measurement.

Real-time scattering of interacting quasiparticles in quantum spin chains

Maarten Van Damme, Laurens Vanderstraeten, Jacopo De Nardis, Jutho Haegeman, and Frank Verstraete

Phys. Rev. Research 3, 013078 (2021) - Published 25 January, 2021

The authors explain how to simulate real-time scattering of quasiparticle wavepackets in spin chains.

Dynamics of an acoustically trapped sphere in beating sound waves

Mohammed A. Abdelaziz and David G. Grier

Phys. Rev. Research 3, 013079 (2021) - Published 26 January, 2021

The authors show that an acoustically levitated sphere driven by a transverse sound wave is an archetypal wave-driven harmonic oscillator that passes through a hierarchy of dynamical transitions as a function of driving frequency.

Polymer translocation through a nanopore assisted by an environment of active rods

Hamidreza Khalilian, Jalal Sarabadani, and Tapio Ala-Nissila

Phys. Rev. Research 3, 013080 (2021) - Published 26 January, 2021

The authors consider the translocation dynamics of a polymer chain through a nanopore into an environment with active rodlike particles and show that rod activity can facilitate translocation even when there is no external driving force on the polymer.

Strong spin-orbit interaction and g-factor renormalization of hole spins in Ge/Si nanowire quantum dots

F. N. M. Froning, M. J. Rančić, B. Hetényi, S. Bosco, M. K. Rehmann, A. Li, E. P. A. M. Bakkers, F. A. Zwanenburg, D. Loss, D. M. Zumbühl, and F. R. Braakman

Phys. Rev. Research 3, 013081 (2021) - Published 26 January, 2021

The authors use double quantum dot transport measurements to reveal the presence of a strong spin-orbit interaction in Ge/Si nanowires. They also show that this strong spin-orbit interaction gives rise to a g-factor renormalization with magnetic field.

Investigating resonant low-energy electron attachment to formamide: Dynamics of model peptide bond dissociation and other fragmentation channels

Guglielmo Panelli, Ali Moradmand, Brandon Griffin, Kyle Swanson, Thorsten Weber, Thomas N. Rescigno, C. William McCurdy, Daniel S. Slaughter, and Joshua B. Williams

Phys. Rev. Research 3, 013082 (2021) - Published 27 January, 2021

The authors combine momentum imaging experiments and ab initio electron scattering theory to study the dynamics of dissociative electron attachment to formamide.

Fractional diffusion theory of balanced heterogeneous neural networks

Asem Wardak and Pulin Gong

Phys. Rev. Research 3, 013083 (2021) - Published 27 January, 2021

The authors present a theory of balanced neural networks, which identifies a type of network state with nonlinear response properties.

Dynamical approach to Zipf's law

Giordano De Marzo, Andrea Gabrielli, Andrea Zaccaria, and Luciano Pietronero

Phys. Rev. Research 3, 013084 (2021) - Published 27 January, 2021

The authors show that Zipf’s law can be understood only by a dynamical approach and that deviations from Zipf’s law unveil physical properties of systems.

Instantaneous phase synchronization of two decoupled quantum limit-cycle oscillators induced by conditional photon detection

Yuzuru Kato and Hiroya Nakao

Phys. Rev. Research 3, 013085 (2021) - Published 28 January, 2021

The authors show that conditional photon detection on the output fields of two decoupled quantum limit-cycle oscillators via a beam splitter induces instantaneous phase synchronization and quantum entanglement.

Quantum-Zeno Fermi polaron in the strong dissipation limit

Tomasz Wasak, Richard Schmidt, and Francesco Piazza

Phys. Rev. Research 3, 013086 (2021) - Published 28 January, 2021

The authors consider the effect of strong dissipation on a mobile impurity immersed in a bath of fermionic particles.

Semiclassical fast-forward shortcuts to adiabaticity

Ayoti Patra and Christopher Jarzynski

Phys. Rev. Research 3, 013087 (2021) - Published 28 January, 2021

This paper develops and validates fast-forward shortcuts to adiabaticity that can be applied to excited energy eigenstates.

Universal relations for dipolar quantum gases

Johannes Hofmann and Wilhelm Zwerger

Phys. Rev. Research 3, 013088 (2021) - Published 28 January, 2021

The authors derive universal relations for two-dimensional quantum gases with both short-range and an additional dipolar interaction.

Strong-field ionization of complex molecules

Joss Wiese, Jolijn Onvlee, Sebastian Trippel, and Jochen Küpper

Phys. Rev. Research 3, 013089 (2021) - Published 28 January, 2021

The authors introduce a semiclassical model to investigate the structure imprints from complex molecular targets in strong-field ionization studies.

Machine learning prediction of critical transition and system collapse

Ling-Wei Kong, Hua-Wei Fan, Celso Grebogi, and Ying-Cheng Lai

Phys. Rev. Research 3, 013090 (2021) - Published 28 January, 2021

This paper proposes a machine learning scheme to predict critical transitions due to parameter drift.

Turbulence role in the fate of virus-containing droplets in violent expiratory events

M. E. Rosti, M. Cavaiola, S. Olivieri, A. Seminara, and A. Mazzino

Phys. Rev. Research 3, 013091 (2021) - Published 29 January, 2021

The authors perform numerical simulations of human coughs and identify the key role of turbulence in dictating the fate of virus-containing droplets with implications on social distancing rules.

Speedup of the quantum adiabatic algorithm using delocalization catalysis

Chenfeng Cao, Jian Xue, Nic Shannon, and Robert Joynt

Phys. Rev. Research 3, 013092 (2021) - Published 29 January, 2021

The authors model quantum optimization as a chemical reaction and propose an algorithm based on combining catalysis with the quantum notion of delocalized particles.

Experimental quantum communication enhancement by superposing trajectories

Giulia Rubino, Lee A. Rozema, Daniel Ebler, Hlér Kristjánsson, Sina Salek, Philippe Allard Guérin, Alastair A. Abbott, Cyril Branciard, Časlav Brukner, Giulio Chiribella, and Philip Walther

Phys. Rev. Research 3, 013093 (2021) - Published 29 January, 2021

This work compares experimentally and numerically different schemes through which a quantum system traveling along a superposition of trajectories can cross two noisy channels.

Signature of anisotropic exchange interaction revealed by vector-field control of the helical order in a FeGe thin plate

Victor Ukleev, Oleg Utesov, Le Yu, Chen Luo, Kai Chen, Florin Radu, Yuichi Yamasaki, Naoya Kanazawa, Yoshinori Tokura, Taka-hisa Arima, and Jonathan S. White

Phys. Rev. Research 3, 013094 (2021) - Published 29 January, 2021

The authors demonstrate the vector-field control of the magnetic screw axis in a chiral helimagnet and show that the spiral period varies the orientation of the screw axis with respect to the principal crystallographic axes.

Dynamical topological excitations in parafermion chains

Vilja Kaskela and J. L. Lado

Phys. Rev. Research 3, 013095 (2021) - Published 29 January, 2021

The authors show the emergence of topological excitations in quantum many-body parafermion chains and demonstrate their robustness to perturbations and disorder.

Low-loss high-fidelity frequency beam splitter with tunable split ratio based on electromagnetically induced transparency

Kao-Fang Chang, Ta-Pang Wang, Chun-Yi Chen, Yi-Hsin Chen, Yu-Sheng Wang, Yong-Fan Chen, Ying-Cheng Chen, and Ite A. Yu

Phys. Rev. Research 3, 013096 (2021) - Published 29 January, 2021

The authors demonstrate a high efficiency and high fidelity frequency beam splitter using coherent-state single photons and show how it can be used for operations or devices in long-distance quantum communication.

Periodic quenches across the Berezinskii-Kosterlitz-Thouless phase transition

K. Brown, T. Bland, P. Comaron, and N. P. Proukakis

Phys. Rev. Research 3, 013097 (2021) - Published 29 January, 2021

The authors study the effect of periodic cycling across the phase transition in a homogeneous two-dimensional ultracold quantum gas, identifying a resonant driving frequency.

Universal shock-wave propagation in one-dimensional Bose fluids

Romain Dubessy, Juan Polo, Hélène Perrin, Anna Minguzzi, and Maxim Olshanii

Phys. Rev. Research 3, 013098 (2021) - Published 29 January, 2021

This article addresses the dynamics of a one-dimensional Bose gas in a box after an initial velocity boost. The authors show that such dynamics can be described in terms of shock waves.

Split-ring polariton condensates as macroscopic two-level quantum systems

Yan Xue, Igor Chestnov, Evgeny Sedov, Evgeniy Kiktenko, Aleksey K. Fedorov, Stefan Schumacher, Xuekai Ma, and Alexey Kavokin

Phys. Rev. Research 3, 013099 (2021) - Published 29 January, 2021

The authors propose a platform for quantum computation based on Bose-Einstein condensates of exciton polaritons.

Nonequilibrium polarity-induced chemotaxis: Emergent Galilean symmetry and exact scaling exponents

Saeed Mahdisoltani, Riccardo Ben Alì Zinati, Charlie Duclut, Andrea Gambassi, and Ramin Golestanian

Phys. Rev. Research 3, 013100 (2021) - Published 29 January, 2021

The authors propose a chemical sensing interaction mechanism by making use of scaling methods along with symmetry considerations.

Bypassing the computational bottleneck of quantum-embedding theories for strong electron correlations with machine learning

John Rogers, Tsung-Han Lee, Sahar Pakdel, Wenhu Xu, Vladimir Dobrosavljević, Yong-Xin Yao, Ove Christiansen, and Nicola Lanatà

Phys. Rev. Research 3, 013101 (2021) - Published 29 January, 2021

The authors develop a computational framework based on machine learning for bypassing the computational bottleneck of quantum-embedding methodologies.

Adiabatic landscape and optimal paths in ergodic systems

Sho Sugiura, Pieter W. Claeys, Anatoly Dymarsky, and Anatoli Polkovnikov

Phys. Rev. Research 3, 013102 (2021) - Published 1 February, 2021

This work analyzes the landscape of adiabatic state deformations at high temperatures in a quantum system with two control parameters.

Time-reversal odd transport in bilayer graphene: Hall conductivity and Hall viscosity

Wei-Han Hsiao

Phys. Rev. Research 3, 013103 (2021) - Published 1 February, 2021

This work explores a relationship between time-reversal odd transport quantities in graphene.

Quantum Zeno approach for molecular energies with maximum commuting initial Hamiltonians

Hongye Yu and Tzu-Chieh Wei

Phys. Rev. Research 3, 013104 (2021) - Published 2 February, 2021

The authors use the maximum commuting Hamiltonian associated with the qubit-version of a molecular Hamiltonian to construct an interpolated Hamiltonian from the former to the latter.

Orbital and magnetic ordering and domain-wall conduction in ferrimagnet La5Mo4O16

Takuro Katsufuji, Masayuki Miyake, Makoto Naka, Masahito Mochizuki, Sota Kogo, Tomomasa Kajita, Yasuhiro Shimizu, Masayuki Itoh, Takatoshi Hasegawa, Shunsuke Shimose, Shunta Noguchi, Takuo Saiki, Takuro Sato, and Fumitaka Kagawa

Phys. Rev. Research 3, 013105 (2021) - Published 2 February, 2021

The authors show that the nonvolatile positive magnetoresistance observed in a ferrimagnet La5Mo4O16 is caused by the electrical conduction along the magnetic domain walls.

Heterogeneous excitable systems exhibit Griffiths phases below hybrid phase transitions

Géza Ódor and Beatriz de Simoni

Phys. Rev. Research 3, 013106 (2021) - Published 2 February, 2021

The authors show that a Griffiths phase can exist below a discontinuous phase transition of hybrid type, as a consequence of quasi-static topological heterogeneity by modules in small world networks.

Scaling of causal neural avalanches in a neutral model

Sakib Matin, Thomas Tenzin, and W. Klein

Phys. Rev. Research 3, 013107 (2021) - Published 3 February, 2021

The authors show that the scaling of causal neural avalanches in the neutral contact process is consistent with the scaling hypothesis near a critical point.

Silicon crystals for steering high-intensity particle beams at ultrahigh-energy accelerators

A. Mazzolari, M. Romagnoni, E. Bagli, L. Bandiera, S. Baricordi, R. Camattari, D. Casotti, M. Tamisari, A. Sytov, V. Guidi, G. Cavoto, S. M. Carturan, D. De Salvador, A. Balbo, G. Cruciani, Thu Nhi Tran Caliste, R. Verbeni, N. Pastrone, L. Lanzoni, A. Rossall, J. A. van den Berg, R. Jenkins, and P. Dumas

Phys. Rev. Research 3, 013108 (2021) - Published 3 February, 2021

The authors report developments in manufacturing and characterization of bent silicon crystals suitable for steering of high-intensity particle beams at ultra-high energy accelerators.

Violation of fluctuation-dissipation relations for electron transfer in nonpolar solvents

Gerdenis Kodis, Ian R. Gould, and Dmitry V. Matyushov

Phys. Rev. Research 3, 013109 (2021) - Published 4 February, 2021

The authors explore the behavior of electron transfer in nonpolar media and observe a non-Arrhenius activated kinetics due to short range of induction interactions between the medium and the electron.

Fundamental bounds on qubit reset

Daniel Basilewitsch, Jonas Fischer, Daniel M. Reich, Dominique Sugny, and Christiane P. Koch

Phys. Rev. Research 3, 013110 (2021) - Published 4 February, 2021

The authors show that the shortest possible qubit reset time depends on the choice of qubit-ancilla interaction and qubit control whereas the maximally achievable fidelity is determined by the Hilbert space dimension of the ancillary system.

Dynamical control of the conductivity of an atomic Josephson junction

Beilei Zhu, Vijay Pal Singh, Junichi Okamoto, and Ludwig Mathey

Phys. Rev. Research 3, 013111 (2021) - Published 5 February, 2021

This work proposes parametric driving of an atomic Josephson junction to dynamically control the conductivity of the system. This driving gives rise to enhancement or suppression of the amplitudes of the oscillation of the density difference Δn.

Engineering entanglement Hamiltonians with strongly interacting cold atoms in optical traps

R. E. Barfknecht, T. Mendes-Santos, and L. Fallani

Phys. Rev. Research 3, 013112 (2021) - Published 5 February, 2021

The authors show that the entanglement spectrum of homogeneous systems can be simulated with strongly interacting cold atoms in harmonic or linear optical traps under the effect of gravity.

Fast universal two-qubit gate for neutral fermionic atoms in optical tweezers

Jonathan Nemirovsky and Yoav Sagi

Phys. Rev. Research 3, 013113 (2021) - Published 8 February, 2021

The authors present a scheme for a fast universal two-qubit gate for fermionic atoms in optical tweezers. The gate operation relies on short-range interactions during a collision process in an external harmonic potential.

Pairing in spinless fermions and spin chains with next-nearest neighbor interactions

Lorenzo Gotta, Leonardo Mazza, Pascal Simon, and Guillaume Roux

Phys. Rev. Research 3, 013114 (2021) - Published 8 February, 2021

The authors study a one-dimensional model of spinless fermions with repulsive next-nearest-neighbour interaction and map out the phase diagram ibn several density regimes.

Work fluctuation theorem for a Brownian particle in a nonconfining potential

Christoph Streißnig and Holger Kantz

Phys. Rev. Research 3, 013115 (2021) - Published 8 February, 2021

The authors derive a work fluctuation theorem for a Brownian particle in a nonconfining potential which yields a lower bound on the work needed to change the potential in time.

Ultrastrong time-dependent light-matter interactions are gauge relative

Adam Stokes and Ahsan Nazir

Phys. Rev. Research 3, 013116 (2021) - Published 8 February, 2021

The authors show that the assumption of a time-dependent light-matter coupling function is physically different in each different gauge, resulting in non-equivalent models with different final predictions for fast and strong interactions.

Effective response theory for Floquet topological systems

Paolo Glorioso, Andrey Gromov, and Shinsei Ryu

Phys. Rev. Research 3, 013117 (2021) - Published 8 February, 2021

The authors introduce an effective field theory framework to classify phases of topological Floquet systems.

Four-dimensional toric code with non-Clifford transversal gates

Tomas Jochym-O'Connor and Theodore J. Yoder

Phys. Rev. Research 3, 013118 (2021) - Published 8 February, 2021

This article constructs an explicit four-dimensional topological quantum error correcting code that allows for a transversal implementation of a multi-controlled-Z gate.

High resolution strain measurements in highly disordered materials

Mark Sutton, Julien R. M. Lhermitte, Françoise Ehrburger-Dolle, and Frédéric Livet

Phys. Rev. Research 3, 013119 (2021) - Published 8 February, 2021

This work presents a high resolution measurement of the deformations or strains in amorphous or disordered materials using the systematic shifts of the speckles seen in coherent small angle x-ray scattering.

Noise optimizes super-Turing computation in recurrent neural networks

Emmett Redd, Steven Senger, and Tayo Obafemi-Ajayi

Phys. Rev. Research 3, 013120 (2021) - Published 8 February, 2021

The authors use noise to restore chaotic behavior and show consistency with super-Turing theory and operation in neural networks.

Density functional theory modeling of cation diffusion in tetragonal bulk ZrO2: Effects of humidity and hydrogen defect complexes on cation transport

Yueh-Lin Lee, Yuhua Duan, Dan C. Sorescu, Dane Morgan, Harry Abernathy, Thomas Kalapos, and Gregory Hackett

Phys. Rev. Research 3, 013121 (2021) - Published 8 February, 2021

The authors use density functional theory to investigate the defect thermodynamics and transport mechanism under various humidity conditions for cation and hydrogen point defects in bulk tetragonal ZrO2.

Observation of topological bound states in a double Su-Schrieffer-Heeger chain composed of split ring resonators

Zhiwei Guo, Jun Jiang, Haitao Jiang, Jie Ren, and Hong Chen

Phys. Rev. Research 3, 013122 (2021) - Published 8 February, 2021

The authors tune the coupling distributions in the photonic Kitaev model and experimentally observe the topological phase transition and topological bound states.

State-dependent phonon-limited spin relaxation of nitrogen-vacancy centers

M. C. Cambria, A. Gardill, Y. Li, A. Norambuena, J. R. Maze, and S. Kolkowitz

Phys. Rev. Research 3, 013123 (2021) - Published 9 February, 2021

This work examines phonon-induced relaxation within the ground state electronic spin manifold of the nitrogen-vacancy center at room temperature.

Seasonal epidemic spreading on small-world networks: Biennial outbreaks and classical discrete time crystals

Daniel Malz, Andrea Pizzi, Andreas Nunnenkamp, and Johannes Knolle

Phys. Rev. Research 3, 013124 (2021) - Published 9 February, 2021

The authors explore a model of seasonal epidemic spreading and show that it displays a time-crystalline phase with characteristic subharmonic response.

Microcanonical and finite-temperature ab initio molecular dynamics simulations on quantum computers

Igor O. Sokolov, Panagiotis Kl. Barkoutsos, Lukas Moeller, Philippe Suchsland, Guglielmo Mazzola, and Ivano Tavernelli

Phys. Rev. Research 3, 013125 (2021) - Published 10 February, 2021

The authors propose an hybrid quantum/classical variational algorithm for the calculation of atomic forces for ab-initio Molecular Dynamics in the microcanonical and canonical ensembles.

Comparison of coherent phonon generation by electronic and ionic Raman scattering in LaAlO3

Martin J. Neugebauer, Dominik M. Juraschek, Matteo Savoini, Pascal Engeler, Larissa Boie, Elsa Abreu, Nicola A. Spaldin, and Steven L. Johnson

Phys. Rev. Research 3, 013126 (2021) - Published 10 February, 2021

The authors compare the efficiency of electronic versus ionic Raman scattering for driving coherent phonons in a simple perovskite oxide with ultrafast laser pulses.

Odd-parity spin-loop-current order mediated by transverse spin fluctuations in cuprates and related electron systems

Hiroshi Kontani, Youichi Yamakawa, Rina Tazai, and Seiichiro Onari

Phys. Rev. Research 3, 013127 (2021) - Published 10 February, 2021

The authors propose a theoretical mechanism of spontaneous spin-loop-current order in high-Tc superconductors.

Structural involvement in the melting of the charge density wave in 1TTiSe2

Max Burian, Michael Porer, Jose R. L. Mardegan, Vincent Esposito, Sergii Parchenko, Bulat Burganov, Namrata Gurung, Mahesh Ramakrishnan, Valerio Scagnoli, Hiroki Ueda, Sonia Francoual, Federica Fabrizi, Yoshikazu Tanaka, Tadashi Togashi, Yuya Kubota, Makina Yabashi, Kai Rossnagel, Steven L. Johnson, and Urs Staub

Phys. Rev. Research 3, 013128 (2021) - Published 10 February, 2021

The authors find that the structural distortion and the underlying electronic structure of the charge density wave in TiSe2 show different energetics at ultrafast timescales.

Symmetry constraints for vector scattering and transfer matrices containing evanescent components: Energy conservation, reciprocity, and time reversal

Niall Byrnes and Matthew R. Foreman

Phys. Rev. Research 3, 013129 (2021) - Published 10 February, 2021

This work derives a set of constraints for scattering and transfer matrices enforced by energy conservation, reciprocity and time reversal symmetry. The authors consider the vectorial nature of optical fields and account for evanescent components.

Quantum limit cycles and the Rayleigh and van der Pol oscillators

Lior Ben Arosh, M. C. Cross, and Ron Lifshitz

Phys. Rev. Research 3, 013130 (2021) - Published 10 February, 2021

The authors explore the classical to quantum transition of a family of dynamical limit cycles, while identifying quantum features.

Cavity optomechanics with photonic bound states in the continuum

Jamie M. Fitzgerald, Sushanth Kini Manjeshwar, Witlef Wieczorek, and Philippe Tassin

Phys. Rev. Research 3, 013131 (2021) - Published 10 February, 2021

The authors report a free-space cavity optomechanics platform built from two photonic crystal membranes, which operates via photonic bound states in the continuum.

Engineering topological phases guided by statistical and machine learning methods

Thomas Mertz and Roser Valentí

Phys. Rev. Research 3, 013132 (2021) - Published 10 February, 2021

The authors apply statistical methods from machine learning to topological insulators.

ZN lattice gauge theory in a ladder geometry

Jens Nyhegn, Chia-Min Chung, and Michele Burrello

Phys. Rev. Research 3, 013133 (2021) - Published 10 February, 2021

The authors analyze a discrete Abelian lattice gauge theory in a ladder geometry, a model relevant for quantum simulations.

Adding machine learning within Hamiltonians: Renormalization group transformations, symmetry breaking and restoration

Dimitrios Bachtis, Gert Aarts, and Biagio Lucini

Phys. Rev. Research 3, 013134 (2021) - Published 10 February, 2021

The authors present a physical interpretation of machine learning by including the predictive function of a neural network as a term within the Hamiltonian of a statistical system.

Parity-time symmetric systems with memory

Zachary A. Cochran, Avadh Saxena, and Yogesh N. Joglekar

Phys. Rev. Research 3, 013135 (2021) - Published 11 February, 2021

The authors show that memory in PT-symmetric systems leads to non-Markovian nonlinearity and self-induced Floquet dynamics.

Nonequilibrium quantum critical steady state: Transport through a dissipative resonant level

Gu Zhang, Chung-Hou Chung, Chung-Ting Ke, Chao-Yun Lin, Henok Mebrahtu, Alex I. Smirnov, Gleb Finkelstein, and Harold U. Baranger

Phys. Rev. Research 3, 013136 (2021) - Published 11 February, 2021

The authors present theory and experiment for a quantum critical state under nonequilibrium steady-state conditions, demonstrating quantitative agreement for the current as a function of bias.

Extreme lightwave electron field emission from a nanotip

Dominique Matte, Nima Chamanara, Lauren Gingras, Laurent P. René de Cotret, Tristan L. Britt, Bradley J. Siwick, and David G. Cooke

Phys. Rev. Research 3, 013137 (2021) - Published 11 February, 2021

The authors test electron field emission theory in the extreme field limit from a metal nanotip illuminated by single-cycle, intense THz pulses.

Cascade superfluorescence in Er:YLF

F. Chiossi, C. Braggio, A. Khanbekyan, G. Carugno, A. Ortolan, G. Ruoso, R. Calabrese, A. Di Lieto, L. Tomassetti, and M. Tonelli

Phys. Rev. Research 3, 013138 (2021) - Published 12 February, 2021

This work reports the spontaneous development of optical coherences through cascading transitions in Er:YLiF4 crystals. The authors analyze the time needed for achieving maximal coherence as a function of the involved ions number.

Modeling the high-temperature phase coexistence region of mixed transition metal oxides from ab initio calculations

Suzanne K. Wallace, Ambroise van Roekeghem, Anton S. Bochkarev, Javier Carrasco, Alexander Shapeev, and Natalio Mingo

Phys. Rev. Research 3, 013139 (2021) - Published 12 February, 2021

This article describes how to calculate the solubility gap of a complex material containing two types of substitution sites, and including configurational, magnetic and vibrational entropy contributions, from first principles.

Nernst and Ettingshausen effects in the Laughlin geometry

S. G. Sharapov, A. A. Varlamov, C. Goupil, and A. V. Kavokin

Phys. Rev. Research 3, 013140 (2021) - Published 12 February, 2021

The authors propose a link between the entropy budget, the magnetic flux and the nondissipative edge currents induced by a magnetic field in a experiment based on the Laughlin’s cylinder with the edges subjected to a temperature gradient.

Breakdown of quantum-to-classical correspondence for diffusion in a high-temperature thermal environment

Dekel Shapira and Doron Cohen

Phys. Rev. Research 3, 013141 (2021) - Published 12 February, 2021

The authors consider a Brownian particle in a tight binding lattice, and show that quantum mechanics modifies the high temperature dependence of its mobility, if the thermal fluctuations of the potential are spatially uncorrelated.

Deterministic and probabilistic deep learning models for inverse design of broadband acoustic cloak

Waqas W. Ahmed, Mohamed Farhat, Xiangliang Zhang, and Ying Wu

Phys. Rev. Research 3, 013142 (2021) - Published 12 February, 2021

The authors propose a machine learning framework to design a broadband acoustic cloak with a multilayered core-shell configuration.

Supersolidity of cnoidal waves in an ultracold Bose gas

Giovanni I. Martone, Alessio Recati, and Nicolas Pavloff

Phys. Rev. Research 3, 013143 (2021) - Published 12 February, 2021

This paper studies the nonlinear periodic patterns generated by a moving impurity in an ultracold Bose gas, also called cnoidal waves, and shows that they possess typical supersolid features in both their static and dynamic behavior.

Attosecond x-ray transient absorption spectroscopy in graphene

Giovanni Cistaro, Luis Plaja, Fernando Martín, and Antonio Picón

Phys. Rev. Research 3, 013144 (2021) - Published 12 February, 2021

The authors develop a semiclassical theory for attosecond transient absorption spectroscopy for graphene and other two-dimensional materials.

Assessing the significance of directed and multivariate measures of linear dependence between time series

Oliver M. Cliff, Leonardo Novelli, Ben D. Fulcher, James M. Shine, and Joseph T. Lizier

Phys. Rev. Research 3, 013145 (2021) - Published 12 February, 2021

The authors present modified hypothesis tests for directed and multivariate linear dependence measures that account for autocorrelation in linear-Gaussian processes.

Role of time scale in the spreading of asymmetrically interacting diseases

Paulo Cesar Ventura, Yamir Moreno, and Francisco A. Rodrigues

Phys. Rev. Research 3, 013146 (2021) - Published 12 February, 2021

The authors study the dynamics of interacting diseases with asymmetric interactions and show how the stationary prevalences of the diseases depend on their relative time scales.

Relativistic effective action of dynamical gravitomagnetic tides for slowly rotating neutron stars

Pawan Kumar Gupta, Jan Steinhoff, and Tanja Hinderer

Phys. Rev. Research 3, 013147 (2021) - Published 15 February, 2021

This work models the gravitomagnetic tidal response of slowly rotating neutron stars through a relativistic worldline effective action.

Topological properties of the long-range Kitaev chain with Aubry-André-Harper modulation

Joana Fraxanet, Utso Bhattacharya, Tobias Grass, Debraj Rakshit, Maciej Lewenstein, and Alexandre Dauphin

Phys. Rev. Research 3, 013148 (2021) - Published 15 February, 2021

This work studies the interplay between algebraically decaying superconducting pairing and the Aubry-André-Harper potential on the bulk and edge topology.

Tiling with triangles: parquet and GWγ methods unified

Friedrich Krien, Anna Kauch, and Karsten Held

Phys. Rev. Research 3, 013149 (2021) - Published 15 February, 2021

The authors present a unification of the parquet formalism and Hedin’s GWγ approach to aid in the computational feasibility of the parquet equations.

Intrinsic and extrinsic effects on intraband optical conductivity of hot carriers in photoexcited graphene

Masatsugu Yamashita and Chiko Otani

Phys. Rev. Research 3, 013150 (2021) - Published 16 February, 2021

The authors investigate the effects of intrinsic optical phonon and extrinsic coulomb scattering on intraband optical conductivity of hot carriers in photoexcited graphene using iterative solutions of Boltzmann transport equation and temperature model.

Bulk electronic structure of high-order quaternary approximants

Shuvam Sarkar, Pampa Sadhukhan, Vipin Kumar Singh, Andrei Gloskovskii, Kazuhiko Deguchi, Nobuhisa Fujita, and Sudipta Roy Barman

Phys. Rev. Research 3, 013151 (2021) - Published 16 February, 2021

The authors use hard x-ray photoelectron spectroscopy to show the existence of a pseudogap at the Fermi level in high-order quaternary approximants, Al-Pd-Mo-Fe and Al-Pd-Cr-Fe.

Typicality of Heisenberg scaling precision in multimode quantum metrology

Giovanni Gramegna, Danilo Triggiani, Paolo Facchi, Frank A. Narducci, and Vincenzo Tamma

Phys. Rev. Research 3, 013152 (2021) - Published 16 February, 2021

This work proposes a Gaussian metrological setup for Heisenberg-scaling precision in the estimation of a parameter embedded in an arbitrary linear passive network. The authors show that the sensitivity becomes typical for large interferometers.

Measuring local moiré lattice heterogeneity of twisted bilayer graphene

Tjerk Benschop, Tobias A. de Jong, Petr Stepanov, Xiaobo Lu, Vincent Stalman, Sense Jan van der Molen, Dmitri K. Efetov, and Milan P. Allan

Phys. Rev. Research 3, 013153 (2021) - Published 16 February, 2021

The authors introduce a method to continuously map inhomogeneities of a moiré lattice and apply to large area topographic images measured on twisted bilayer graphene acquired using Scanning Tunneling Microscopy.

Damped point-vortex model for polar-core spin vortices in a ferromagnetic spin-1 Bose-Einstein condensate

L. A. Williamson and P. B. Blakie

Phys. Rev. Research 3, 013154 (2021) - Published 17 February, 2021

The authors identify an additional damping mechanism in the vortex dynamics of quasi-two-dimensional spin-1 Bose-Einstein condensates arising from coupling to sound waves.

Optimal inference of the start of COVID-19

Zheng-Meng Zhai, Yong-Shang Long, Ming Tang, Zonghua Liu, and Ying-Cheng Lai

Phys. Rev. Research 3, 013155 (2021) - Published 17 February, 2021

This paper develops a data driven, inverse-inference, predictive modeling framework based on non-Markovian spreading dynamics for COVID-19 to estimate the beginning of the pandemic.

Reaction rates and the noisy saddle-node bifurcation: Renormalization group for barrier crossing

David Hathcock and James P. Sethna

Phys. Rev. Research 3, 013156 (2021) - Published 17 February, 2021

The authors introduce a renormalization-group and scaling framework for barrier crossing problems, which unifies Kramers’ theory for chemical reaction rates with the dynamical systems theory of a noisy saddle-node bifurcation.

Anomalous role of information diffusion in epidemic spreading

Xiaochen Wang, Xuzhen Zhu, Xiaofeng Tao, Jinghua Xiao, Wei Wang, and Ying-Cheng Lai

Phys. Rev. Research 3, 013157 (2021) - Published 17 February, 2021

The authors model the coevolution dynamics of information diffusion, resource allocation and epidemic spreading, and show that the information diffusion may worsen the epidemic spreading subject to allocations of limited resources.

Geomagnetic reversals at the edge of regularity

Breno Raphaldini, Everton S. Medeiros, David Ciro, Daniel Ribeiro Franco, and Ricardo I. F. Trindade

Phys. Rev. Research 3, 013158 (2021) - Published 18 February, 2021

This article supports the existence of regular patterns embedded in the Earth geomagnetic reversal sequences, suggesting that the geodynamo system has already operated on the edge of regularity and chaos.

Optimal estimation of time-dependent gravitational fields with quantum optomechanical systems

Sofia Qvarfort, A. Douglas K. Plato, David Edward Bruschi, Fabienne Schneiter, Daniel Braun, Alessio Serafini, and Dennis Rätzel

Phys. Rev. Research 3, 013159 (2021) - Published 18 February, 2021

The authors demonstrate that modulating the optomechanical coupling in an optomechanical sensor can be used to enhance its sensitivity, and use the results to estimate the sensitivity for detecting gravitational fields from small oscillating masses and passing gravitational waves.

Characterizing spin-one Kitaev quantum spin liquids

Ilia Khait, P. Peter Stavropoulos, Hae-Young Kee, and Yong Baek Kim

Phys. Rev. Research 3, 013160 (2021) - Published 18 February, 2021

The authors study the S=1 Kitaev model using the density matrix renormalization group, and characterize the magnetic phase diagram of cylindric ladder geometries to find evidence for an intermediate phase for antiferromagnetic Kitaev couplings.

Finite-temperature spin dynamics of a two-dimensional Bose-Bose atomic mixture

Arko Roy, Miki Ota, Alessio Recati, and Franco Dalfovo

Phys. Rev. Research 3, 013161 (2021) - Published 18 February, 2021

This work shows that thermal fluctuations in a two-dimensional mixture of two Bose gases inhibit true Bose-Einstein condensation and smoothen all sharp features in the miscible to immiscible phase transition at finite temperature.

Anomalous softening of phonon dispersion in cuprate superconductors

Saheli Sarkar, Maxence Grandadam, and Catherine Pépin

Phys. Rev. Research 3, 013162 (2021) - Published 18 February, 2021

The authors investigate the onset of phonon-softening associated with charge-density wave order below superconducting critical temperatures in under-doped cuprate superconductors.

Virus spread versus contact tracing: Two competing contagion processes

Adriana Reyna-Lara, David Soriano-Paños, Sergio Gómez, Clara Granell, Joan T. Matamalas, Benjamin Steinegger, Alex Arenas, and Jesús Gómez-Gardeñes

Phys. Rev. Research 3, 013163 (2021) - Published 19 February, 2021

The authors model contact tracing as a secondary contagion process that competes with that of the pathogen, thus effectively breaking transmission chains, and show that contact tracing allows to bend the curve.

Properties of a deep seismic waveguide measured with an optical fiber

Ariel Lellouch, Ettore Biondi, Biondo L. Biondi, Bin Luo, Ge Jin, and Mark A. Meadows

Phys. Rev. Research 3, 013164 (2021) - Published 19 February, 2021

The authors report the observation of seismic guided waves in a deep subsurface structure through in-situ fiber-optic sensing.

Quantum thermodynamically consistent local master equations

Adam Hewgill, Gabriele De Chiara, and Alberto Imparato

Phys. Rev. Research 3, 013165 (2021) - Published 19 February, 2021

The paper discusses the thermodynamic consistency of quantum master equations revealing an extra contribution to the heat current due to non-compatibility of operators in quantum mechanics.

Infinite hierarchy of solitons: Interaction of Kerr nonlinearity with even orders of dispersion

Antoine F. J. Runge, Y. Long Qiang, Tristram J. Alexander, M. Z. Rafat, Darren D. Hudson, Andrea Blanco-Redondo, and C. Martijn de Sterke

Phys. Rev. Research 3, 013166 (2021) - Published 22 February, 2021

The authors demonstrate the existence of optical solitons arising from the balance between self-phase modulation and negative, pure, even high-order dispersion using a fiber laser incorporating a spectral pulse shaper.

Toward pricing financial derivatives with an IBM quantum computer

Ana Martin, Bruno Candelas, Ángel Rodríguez-Rozas, José D. Martín-Guerrero, Xi Chen, Lucas Lamata, Román Orús, Enrique Solano, and Mikel Sanz

Phys. Rev. Research 3, 013167 (2021) - Published 22 February, 2021

The authors employ the quantum principal component analysis to simulate the time evolution of several time-maturing forward rates.

Topological critical states and anomalous electronic transmittance in one-dimensional quasicrystals

Junmo Jeon and SungBin Lee

Phys. Rev. Research 3, 013168 (2021) - Published 22 February, 2021

The authors propose a pattern equivariant cohomology of quasicrystals and classify their electronic transport properties.

Broken C4 symmetry in the tetragonal state of uniaxial strained BaCo0.9Ni0.1S1.9

Shin-ichi Shamoto, Hiroki Yamauchi, Kazuhiko Ikeuchi, Ryoichi Kajimoto, and Jun'ichi Ieda

Phys. Rev. Research 3, 013169 (2021) - Published 22 February, 2021

The authors describe a broken C4 lattice symmetry in the tetragonal phase of BaCo0.9Ni0.1S1.9.

Fraudulent white noise: Flat power spectra belie arbitrarily complex processes

Paul M. Riechers and James P. Crutchfield

Phys. Rev. Research 3, 013170 (2021) - Published 22 February, 2021

The authors show that a flat power spectrum belies predictable structures in observed processes.

Charge qubit in a triple quantum dot with tunable coherence

B. Kratochwil, J. V. Koski, A. J. Landig, P. Scarlino, J. C. Abadillo-Uriel, C. Reichl, S. N. Coppersmith, W. Wegscheider, Mark Friesen, A. Wallraff, T. Ihn, and K. Ensslin

Phys. Rev. Research 3, 013171 (2021) - Published 22 February, 2021

The authors investigate the coherence properties of a new triple quantum dot charge qubit.

Photoemission spectrum in paramagnetic FeO under pressure: Towards an ab initio description

S. Di Sabatino, J. Koskelo, J. A. Berger, and P. Romaniello

Phys. Rev. Research 3, 013172 (2021) - Published 22 February, 2021

This work shows that the insulator-to-metal transition observed in paramagnetic FeO at high pressure can be described from first principles by using a refined version of the many-body effective energy theory.

Spin and density self-ordering in dynamic polarization gradients fields

Natalia Masalaeva, Wolfgang Niedenzu, Farokh Mivehvar, and Helmut Ritsch

Phys. Rev. Research 3, 013173 (2021) - Published 23 February, 2021

The authors show that the coupled atom-cavity system implements central aspects of the t-J-V-W spin model with four qualitatively distinct density- and spin-ordered phases including ferromagnetic and antiferromagnetic order.

Wannier-Stark flatbands in Bravais lattices

Arindam Mallick, Nana Chang, Wulayimu Maimaiti, Sergej Flach, and Alexei Andreanov

Phys. Rev. Research 3, 013174 (2021) - Published 23 February, 2021

The authors show that adding a DC field to a Bravais lattice tight binding Hamiltonian results in Wannier-Stark flat energy bands and super-exponentially localized wave functions.

Information geometric inequalities of chemical thermodynamics

Kohei Yoshimura and Sosuke Ito

Phys. Rev. Research 3, 013175 (2021) - Published 23 February, 2021

This paper studies a connection between chemical thermodynamics and information geometry. The authors show a link between speed limits and the Cramér–Rao inequality, and information-geometric trade-off relations in chemical reaction networks.

Quality of internal representation shapes learning performance in feedback neural networks

Lee Susman, Francesca Mastrogiuseppe, Naama Brenner, and Omri Barak

Phys. Rev. Research 3, 013176 (2021) - Published 23 February, 2021

The authors find a resonance frequency at which feedback neural networks reproduce a sinusoidal wave, and show that network performance is determined by the robustness of the corresponding internal representation.

Interfacial spin-flip-generated charge pumping

Sang-Chan Lee, Suik Cheon, and Hyun-Woo Lee

Phys. Rev. Research 3, 013177 (2021) - Published 23 February, 2021

The authors investigate the charge pumping induced by precessing magnetization under the effect of the interfacial spin-flip potential, and find theoretical connections between the spin pumping theory and generalized magnetoelectronic circuit theory.

Tunable-spin-model generation with spin-orbit-coupled fermions in optical lattices

Mikhail Mamaev, Itamar Kimchi, Rahul M. Nandkishore, and Ana Maria Rey

Phys. Rev. Research 3, 013178 (2021) - Published 23 February, 2021

The authors explore a method to use ultracold atoms in lattices as quantum simulators of tunable spin models.

Testing topological phase transitions in Kitaev materials under in-plane magnetic fields: Application to αRuCl3

Jacob S. Gordon and Hae-Young Kee

Phys. Rev. Research 3, 013179 (2021) - Published 24 February, 2021

The authors show the onset of a thermodynamic signature triggered by a Ising topological order transition driven by the magnetic field angle.

Extended superconducting dome revealed by angle-resolved photoemission spectroscopy of electron-doped cuprates prepared by the protect annealing method

C. Lin, T. Adachi, M. Horio, T. Ohgi, M. A. Baqiya, T. Kawamata, H. Sato, T. Sumura, K. Koshiishi, S. Nakata, G. Shibata, K. Hagiwara, M. Suzuki, K. Ono, K. Horiba, H. Kumigashira, S. Ideta, K. Tanaka, Y. Koike, and A. Fujimori

Phys. Rev. Research 3, 013180 (2021) - Published 24 February, 2021

The authors investigate the extended superconducting dome of electron-doped high-Tc cuprate after protect annealing, by means of angle-resolved photoemission spectroscopy.

Competition between fractional quantum Hall liquid and Wigner solid at small fillings: Role of layer thickness and Landau level mixing

K. A. Villegas Rosales, S. K. Singh, Meng K. Ma, Md. Shafayat Hossain, Y. J. Chung, L. N. Pfeiffer, K. W. West, K. W. Baldwin, and M. Shayegan

Phys. Rev. Research 3, 013181 (2021) - Published 25 February, 2021

The authors find signatures of magnetic-field-induced Wigner solids at small Landau level filling factors in two-dimensional electron systems confined to AlAs quantum wells.

Capturing non-Markovian dynamics on near-term quantum computers

Kade Head-Marsden, Stefan Krastanov, David A. Mazziotti, and Prineha Narang

Phys. Rev. Research 3, 013182 (2021) - Published 25 February, 2021

The authors present a generalizable quantum algorithm to treat non-Markovian dynamics in open quantum systems using near-term quantum computers.

Breakdown of universality in three-dimensional Dirac semimetals with random impurities

J. P. Santos Pires, B. Amorim, Aires Ferreira, İnanç Adagideli, Eduardo R. Mucciolo, and J. M. Viana Parente Lopes

Phys. Rev. Research 3, 013183 (2021) - Published 25 February, 2021

The authors study the effects of random spherical impurities in the electronic density of states of three-dimensional Dirac semimetals.

Gutzwiller hybrid quantum-classical computing approach for correlated materials

Yongxin Yao, Feng Zhang, Cai-Zhuang Wang, Kai-Ming Ho, and Peter P. Orth

Phys. Rev. Research 3, 013184 (2021) - Published 25 February, 2021

The authors develop a hybrid quantum-classical simulation framework for correlated quantum materials based on Gutzwiller variational embedding theory.

Higher-rank tensor non-Abelian field theory: Higher-moment or subdimensional polynomial global symmetry, algebraic variety, Noether's theorem, and gauging

Juven Wang, Kai Xu, and Shing-Tung Yau

Phys. Rev. Research 3, 013185 (2021) - Published 25 February, 2021

This work explores the mathematical framework of higher-moment or subdimensional polynomial global symmetry, in the context of fracton matter and tensor field theory.

Revealing the mechanism of lymphoid and myeloid cell differentiation and transdifferentiation through landscape quantification

Chenyong Zhang and Chunhe Li

Phys. Rev. Research 3, 013186 (2021) - Published 26 February, 2021

The authors propose a general approach for parameter inference and landscape construction of gene network models based on static expression data.

Geometrical formulation of adiabatic pumping as a heat engine

Yuki Hino and Hisao Hayakawa

Phys. Rev. Research 3, 013187 (2021) - Published 26 February, 2021

The authors propose an adiabatic heat engine using only Berry-phase-like quantity in the parameter space of Thouless pump in an open system driven by two periodically modulated heat reservoirs.

Superfluid swimmers

G. V. Kolmakov and I. S. Aranson

Phys. Rev. Research 3, 013188 (2021) - Published 26 February, 2021

The authors demonstrate that Janus microparticles under illumination exhibit self-propelled motion in superfluid helium, similar to the swimming of living microorganisms and their synthetic analogs.

Rise and fall of non-Fermi liquid fixed points in multipolar Kondo problems

Daniel J. Schultz, Adarsh S. Patri, and Yong Baek Kim

Phys. Rev. Research 3, 013189 (2021) - Published 26 February, 2021

The authors study non-Fermi liquid states due to the multipolar Kondo effect by using perturbative renormalization group analysis, and differences in the type of ground state depending on whether they are considered separately or together.

Undulating compression and multistage relaxation in a granular column consisting of dust particles or glass beads

Felipe Pacheco-Vázquez, Tomomi Omura, and Hiroaki Katsuragi

Phys. Rev. Research 3, 013190 (2021) - Published 26 February, 2021

The authors find periodic undulation and complex relaxation in uniaxial compression of a hierarchical granular column.

Proteinlike dynamical transition of hydrated polymer chains

L. Tavagnacco, M. Zanatta, E. Buratti, B. Rosi, B. Frick, F. Natali, J. Ollivier, E. Chiessi, M. Bertoldo, E. Zaccarelli, and A. Orecchini

Phys. Rev. Research 3, 013191 (2021) - Published 26 February, 2021

The authors use neutron scattering experiments and atomistic simulations to study protein dynamical transitions to nonbiological systems, and show that these occur independently of their internal architecture.

Einstein-Podolsky-Rosen entanglement and asymmetric steering between distant macroscopic mechanical and magnonic systems

Huatang Tan and Jie Li

Phys. Rev. Research 3, 013192 (2021) - Published 26 February, 2021

The authors present a scheme for establishing a long-distance macroscopic phonon-magnon Einstein-Podolsky-Rosen entanglement and steering with a driven electromechanical cavity coupled unidirectionally to a distant electromagnonical cavity.

Circular polarization of gravitational waves from early-Universe helical turbulence

Tina Kahniashvili, Axel Brandenburg, Grigol Gogoberidze, Sayan Mandal, and Alberto Roper Pol

Phys. Rev. Research 3, 013193 (2021) - Published 26 February, 2021

The authors show that helical magnetic fields and fluid motions can drive circularly polarized gravitational waves in the early universe.

Natural heavy-hole flopping mode qubit in germanium

Philipp M. Mutter and Guido Burkard

Phys. Rev. Research 3, 013194 (2021) - Published 26 February, 2021

The authors show that strong and highly tunable couplings of a flopping mode spin qubit to both classical and quantized electric fields arise naturally.

Towards the complete phase profiling of attosecond wave packets

Jaco Fuchs, Nicolas Douguet, Stefan Donsa, Fernando Martín, Joachim Burgdörfer, Luca Argenti, Laura Cattaneo, and Ursula Keller

Phys. Rev. Research 3, 013195 (2021) - Published 26 February, 2021

The authors use the angular asymmetry in an attosecond photoionisation experiment to characterize the electron wave packets spectral phase.

Life and death of a cold BaRb+ molecule inside an ultracold cloud of Rb atoms

Amir Mohammadi, Artjom Krükow, Amir Mahdian, Markus Deiß, Jesús Pérez-Ríos, Humberto da Silva, Jr., Maurice Raoult, Olivier Dulieu, and Johannes Hecker Denschlag

Phys. Rev. Research 3, 013196 (2021) - Published 26 February, 2021

This work maps out the evolution of an initially weakly-bound BaRb+ molecule which is colliding with ultracold Rb atoms. The evolution is driven by various inelastic and reactive processes.

Penalty methods for a variational quantum eigensolver

Kohdai Kuroiwa and Yuya O. Nakagawa

Phys. Rev. Research 3, 013197 (2021) - Published 26 February, 2021

The authors analyze two penalty terms used in the variational quantum eigensolver to impose given symmetries on quantum states.

Crystalline anisotropic topological superconductivity in planar Josephson junctions

Joseph D. Pakizer, Benedikt Scharf, and Alex Matos-Abiague

Phys. Rev. Research 3, 013198 (2021) - Published 26 February, 2021

The authors investigate the effects of crystalline anisotropy on the topological superconducting state in Josephson junctions, identify the magnetic field and junction orientations that optimize the topological gap, and reveal the existence of tunable transitions in Majorana states.

High-purity pulsed squeezing generation with integrated photonics

Chaohan Cui, Christos N. Gagatsos, Saikat Guha, and Linran Fan

Phys. Rev. Research 3, 013199 (2021) - Published 26 February, 2021

The authors propose a method to realize pulse squeezing with high temporal purity.

Channel-noise tracking for sub-shot-noise-limited receivers with neural networks

M. T. DiMario and F. E. Becerra

Phys. Rev. Research 3, 013200 (2021) - Published 1 March, 2021

This article develops a method based on neural networks for tracking and correcting for complex noise from multiple sources in the communication channel for non-Gaussian receivers.

Quantum Hall edge states under periodic driving: A Floquet induced chirality switch

A. Huamán, L. E. F. Foa Torres, C. A. Balseiro, and Gonzalo Usaj

Phys. Rev. Research 3, 013201 (2021) - Published 1 March, 2021

This work reports on the effect of intense laser illumination on the electronic properties of graphene in the quantum Hall regime to show how the laser polarization can be harnessed to turn off or even invert the sign of the Hall conductance.

Causality in quantum optics and entanglement of Minkowski vacuum

Anatoly Svidzinsky, Arash Azizi, Jonathan S. Ben-Benjamin, Marlan O. Scully, and William Unruh

Phys. Rev. Research 3, 013202 (2021) - Published 1 March, 2021

This paper discusses the number correlations and subsequent observables of Rindler photon in a Minkowski vacuum .

Simulations of hydrogen outgassing and sticking coefficients at a copper electrode surface: Dependencies on temperature, incident angle and energy

S. N. Sami, M. Sanati, and R. P. Joshi

Phys. Rev. Research 3, 013203 (2021) - Published 3 March, 2021

The authors show simulations of adsorption and absorption at normal incidence as a function of energy in hydrogen outgassing.

Experimental implementation of non-Clifford interleaved randomized benchmarking with a controlled-S gate

Shelly Garion, Naoki Kanazawa, Haggai Landa, David C. McKay, Sarah Sheldon, Andrew W. Cross, and Christopher J. Wood

Phys. Rev. Research 3, 013204 (2021) - Published 3 March, 2021

The authors demonstrate calibration and benchmarking of a non-Clifford two-qubit controlled pi/2 phase gate with a gate error of 0.59% on an IBM cloud quantum computer using an open source pulse language.

Searching spin-mass interaction using a diamagnetic levitated magnetic-resonance force sensor

Fang Xiong, Tong Wu, Yingchun Leng, Rui Li, Chang-Kui Duan, Xi Kong, Pu Huang, Zhengwei Li, Yu Gao, Xing Rong, and Jiangfeng Du

Phys. Rev. Research 3, 013205 (2021) - Published 4 March, 2021

The authors propose an axion-like particles searching scheme to test the spin-mass interaction between the polarized electron spins and a diamagnetically levitated microsphere.

Focusing and Green's function retrieval in three-dimensional inverse scattering revisited: A single-sided Marchenko integral for the full wave field

Leon Diekmann and Ivan Vasconcelos

Phys. Rev. Research 3, 013206 (2021) - Published 4 March, 2021

The authors present a framework for Marchenko-type integrals in three-dimensional full wavefield inverse scattering by introducing the homogeneous Green’s function of the second kind.

Kinetic and hydrodynamic regimes in multi-particle-collision dynamics of a one-dimensional fluid with thermal walls

Stefano Lepri, Guido Ciraolo, Pierfrancesco Di Cintio, Jamie Gunn, and Roberto Livi

Phys. Rev. Research 3, 013207 (2021) - Published 5 March, 2021

The Authors consider nonequilibrium steady states of a one-dimensional fluid of particles interacting by multi-particle collisions and in contact with two thermal-wall reservoirs, and observe a crossover from a normal to anomalous transport regimes above a characteristic size.

Transport and spectral features in non-Hermitian open systems

A. F. Tzortzakakis, K. G. Makris, A. Szameit, and E. N. Economou

Phys. Rev. Research 3, 013208 (2021) - Published 5 March, 2021

The authors show a mechanism of propagation in open non-Hermitian lattices subject to strong disorder by jumps to selected sites hosting nonorthogonal states.

Equilibrium to off-equilibrium crossover in homogeneous active matter

Andrea Cavagna, Luca Di Carlo, Irene Giardina, Tomás S. Grigera, and Giulia Pisegna

Phys. Rev. Research 3, 013210 (2021) - Published 5 March, 2021

The authors show that an equilibrium to off-equilibrium dynamical crossover in field theory for active matter is driven by the level of activity and the system’s size.

Ollivier-Ricci curvature convergence in random geometric graphs

Pim van der Hoorn, William J. Cunningham, Gabor Lippner, Carlo Trugenberger, and Dmitri Krioukov

Phys. Rev. Research 3, 013211 (2021) - Published 5 March, 2021

This article shows that the Ollivier curvature of random geometric graphs in any Riemannian manifold converges in the mesoscopic regime to Ricci curvature of the manifold.

Crossover in the dynamical critical exponent of a quenched two-dimensional Bose gas

A. J. Groszek, P. Comaron, N. P. Proukakis, and T. P. Billam

Phys. Rev. Research 3, 013212 (2021) - Published 8 March, 2021

The authors investigate the phase ordering dynamics of a two-dimensional Bose gas following a quench, for varying dissipation strength. They characterize the dependence of the dynamical critical exponent, z, on the dissipation strength, finding an anomalous value of z in the dissipationless limit.

Hardness of efficiently generating ground states in postselected quantum computation

Yuki Takeuchi, Yasuhiro Takahashi, and Seiichiro Tani

Phys. Rev. Research 3, 013213 (2021) - Published 8 March, 2021

The authors relate the hardness of approximately generating ground states of local Hamiltonians to the collapse of the counting hierarchy.

Anomalous violation of the local constant field approximation in colliding laser beams

Q. Z. Lv, E. Raicher, C. H. Keitel, and K. Z. Hatsagortsyan

Phys. Rev. Research 3, 013214 (2021) - Published 8 March, 2021

The authors show an anomalous failure of the widely used local constant field approximation for treating radiation of an electron interacting with strong counterpropagating laser waves.

Metasurface spatiotemporal dynamics and asymmetric photonic spin-orbit interactions mediated vector-polarization optical chaos

Mingfeng Xu, Fei Zhang, Mingbo Pu, Xiong Li, Xiaoliang Ma, Yinghui Guo, Renyan Zhang, Minghui Hong, and Xiangang Luo

Phys. Rev. Research 3, 013215 (2021) - Published 8 March, 2021

The authors introduce a framework for spatiotemporal interaction between passive metasurface and laser chaos, and report the vector-polarization optical chaos with spatially heterogeneous polarization dynamics.

Magnetic anisotropy in spin-3/2 with heavy ligand in honeycomb Mott insulators: Application to CrI3

P. Peter Stavropoulos, Xiaoyu Liu, and Hae-Young Kee

Phys. Rev. Research 3, 013216 (2021) - Published 8 March, 2021

The authors derive a microscopic spin model for transition metals with d3surrounded by heavy ligands in honeycomb Mott insulators and apply it to ferromagnetic CrI3.

Entanglement Hamiltonian of interacting systems: Local temperature approximation and beyond

Mahdieh Pourjafarabadi, Hanieh Najafzadeh, Mohammad-Sadegh Vaezi, and Abolhassan Vaezi

Phys. Rev. Research 3, 013217 (2021) - Published 8 March, 2021

The authors investigate the second quantization form of the entanglement Hamiltonian of the ground-state of several interacting lattice fermions and spin models. They define an effective local temperature by comparing the local terms in the entanglement Hamiltonian and the model Hamiltonian itself.

Randomness for quantum channels: Genericity of catalysis and quantum advantage of uniformness

Seok Hyung Lie and Hyunseok Jeong

Phys. Rev. Research 3, 013218 (2021) - Published 8 March, 2021

The authors report a new no-go theorem called the no-secret theorem and discuss its implication for the catalysis of randomness when implementing quantum channels.

Energy diffusion and absorption in chaotic systems with rapid periodic driving

Wade Hodson and Christopher Jarzynski

Phys. Rev. Research 3, 013219 (2021) - Published 8 March, 2021

The authors establish the diffusive evolution of energy in chaotic, ergodic Hamiltonian systems subject to rapid periodic driving, and connect this diffusion process to Floquet prethermalization, relaxation to infinite temperature, and quantum mechanical energy absorption.

Control of spontaneous emission dynamics in microcavities with chiral exceptional surfaces

Q. Zhong, A. Hashemi, Ş. K. Özdemir, and R. El-Ganainy

Phys. Rev. Research 3, 013220 (2021) - Published 8 March, 2021

The authors show how chiral exceptional surfaces can be used to tune the spontaneous emission rate from a single quantum emitter inside an optical microcavity, from total suppression to a two fold enhancement compared to a similar cavity operating at a diabolic point.

Formative period in the x-ray-induced photodissociation of organic molecules

E. Kukk, H. Fukuzawa, J. Niskanen, K. Nagaya, K. Kooser, D. You, J. Peschel, S. Maclot, A. Niozu, S. Saito, Y. Luo, E. Pelimanni, E. Itälä, J. D. Bozek, T. Takanashi, M. Berholts, P. Johnsson, and K. Ueda

Phys. Rev. Research 3, 013221 (2021) - Published 9 March, 2021

The authors combine x-ray free electron laser pulses and infrared laser pulses to characterize the femtosecond-scale electronic relaxation, ring opening and fragmentation processes on a thiophene molecule.

Understanding adaptive immune system as reinforcement learning

Takuya Kato and Tetsuya J. Kobayashi

Phys. Rev. Research 3, 013222 (2021) - Published 9 March, 2021

The work proposes a theoretical framework to associate the adaptive immune network organized with T cells with network-based reinforcement learning and investigate its general properties as a learning system.

Non-Hermitian Fabry-Pérot resonances in a PT-symmetric system

Ken Shobe, Keiichi Kuramoto, Ken-Ichiro Imura, and Naomichi Hatano

Phys. Rev. Research 3, 013223 (2021) - Published 9 March, 2021

The authors study non-Hermitian resonances in non-Hermitian scattering problems and find anomalous divergent transmission peaks in a weakly non-Hermitian regime, while superficially Hermitian Fabry-Perot resonances in its deep non-Hermitian regime.

Exciton condensation in bilayer spin-orbit insulator

Hidemaro Suwa, Shang-Shun Zhang, and Cristian D. Batista

Phys. Rev. Research 3, 013224 (2021) - Published 9 March, 2021

The paper develops a theory to show that bilayer iridates can act as excitonic insulators.

Buried moiré supercells through SrTiO3 nanolayer relaxation

Max Burian, Bill Francesco Pedrini, Nazaret Ortiz Hernandez, Hiroki Ueda, C. A. F. Vaz, Marco Caputo, Milan Radovic, and Urs Staub

Phys. Rev. Research 3, 013225 (2021) - Published 9 March, 2021

The authors find that an annealing process can create a highly ordered network of two-dimensional line defects at the buried interface between a relaxed film and its substrate.

Fractonic superfluids. II. Condensing subdimensional particles

Shuai A. Chen, Jian-Keng Yuan, and Peng Ye

Phys. Rev. Research 3, 013226 (2021) - Published 9 March, 2021

This work shows how a fractonic superfluid emerges in a many-body system where distinct species of bosons are mutually interacting and are movable along distinct orthogonal directions.

Two-parameter counter-diabatic driving in quantum annealing

Luise Prielinger, Andreas Hartmann, Yu Yamashiro, Kohji Nishimura, Wolfgang Lechner, and Hidetoshi Nishimori

Phys. Rev. Research 3, 013227 (2021) - Published 9 March, 2021

The authors introduce a two-parameter counter-diabatic protocol to enhance the performance of quantum annealing to solve generic combinatorial optimization problems.

Correlated variational treatment of ionization coupled to nuclear motion: Ultrafast pump and ionizing probe of electronic and nuclear dynamics in LiH

Roger Y. Bello, Robert R. Lucchese, Thomas N. Rescigno, and C. William McCurdy

Phys. Rev. Research 3, 013228 (2021) - Published 10 March, 2021

This article studies bound and continuum electron correlations to form the lens through which pump/probe measurements image the dynamics of intermediate electronic states populated by the pump pulse.

Quench-induced dynamical topology under dynamical noise

Lin Zhang, Long Zhang, and Xiong-Jun Liu

Phys. Rev. Research 3, 013229 (2021) - Published 10 March, 2021

The authors explore how the quench-induced dynamical topology evolves under dynamical noise and its influence on the topological properties of the systems.

Probing mirror anomaly and classes of Dirac semimetals with circular dichroism

Abhirup Roy Karmakar, S. Nandy, G. P. Das, and Kush Saha

Phys. Rev. Research 3, 013230 (2021) - Published 11 March, 2021

The authors show that the circular dichroism can be used to probe mirror anomaly and different types of Dirac semimetals in the presence of a magnetic field.

Supergranule aggregation for constant heat flux-driven turbulent convection

Philipp P. Vieweg, Janet D. Scheel, and Jörg Schumacher

Phys. Rev. Research 3, 013231 (2021) - Published 11 March, 2021

The authors observe the gradual formation of a pair of large cells in a fully turbulent and laterally extended thermal convection layer with imposed constant heat flux at the top and bottom.

Hamiltonian memory: An erasable classical bit

Roi Holtzman, Geva Arwas, and Oren Raz

Phys. Rev. Research 3, 013232 (2021) - Published 12 March, 2021

The authors show that in an ideal setting a Hamiltonian system can serve as an erasable bit with zero energy expenditure.

Two relativistic Kondo effects: Classification with particle and antiparticle impurities

Yasufumi Araki, Daiki Suenaga, Kei Suzuki, and Shigehiro Yasui

Phys. Rev. Research 3, 013233 (2021) - Published 12 March, 2021

The authors classify two types of Kondo effects realized in relativistic fermion systems, where the first type is caused by the presence of a particle impurity, and the second type is induced by the coexistence of particle and antiparticle impurities.

Decelerated aging in metallic glasses by low temperature thermal cycling

Marian Bruns, Muhammad Hassani, Fathollah Varnik, Afrouz Hassanpour, Sergyi Divinski, and Gerhard Wilde

Phys. Rev. Research 3, 013234 (2021) - Published 12 March, 2021

The work presents a combined study on the impact of cryogenic thermal cycling in terms of differential scanning calorimetry measurements on bulk metallic glasses and extensive molecular dynamics simulations of a generic model glass former.

Protecting operations on qudits from noise by continuous dynamical decoupling

Reginaldo de Jesus Napolitano, Felipe Fernandes Fanchini, Adonai Hilario da Silva, and Bruno Bellomo

Phys. Rev. Research 3, 013235 (2021) - Published 12 March, 2021

The authors present a generalized procedure to protect by means of dynamical decoupling one or several qudits from general noise during the action of an arbitrary many-qudit gate.

Measures of space-time nonseparability of electromagnetic pulses

Yijie Shen, Apostolos Zdagkas, Nikitas Papasimakis, and Nikolay I. Zheludev

Phys. Rev. Research 3, 013236 (2021) - Published 12 March, 2021

The authors introduce state tomography for the quantitative characterization of space-time entangled electromagnetic pulses and report on its application to the propagation of single-cycle toroidal pulses and wideband beams.

Optimal energy conversion through antiadiabatic driving breaking time-reversal symmetry

L. M. Cangemi, M. Carrega, A. De Candia, V. Cataudella, G. De Filippis, M. Sassetti, and G. Benenti

Phys. Rev. Research 3, 013237 (2021) - Published 12 March, 2021

The authors show that a isothermal heat engine operating in the fast driving regime achieves optimal energy conversion efficiency, finite output power, and very small relative power fluctuations.

Absorbing phase transition with a continuously varying exponent in a quantum contact process: A neural network approach

Minjae Jo, Jongshin Lee, K. Choi, and B. Kahng

Phys. Rev. Research 3, 013238 (2021) - Published 15 March, 2021

The authors show that the crossover from a quantum to a classical absorbing phase transition arising in the quantum contact process occurs in a soft landing manner: a critical exponent is continuously varying in some interval between the two extremes.

Boundary-obstructed topological phases

Eslam Khalaf, Wladimir A. Benalcazar, Taylor L. Hughes, and Raquel Queiroz

Phys. Rev. Research 3, 013239 (2021) - Published 15 March, 2021

The authors introduce a notion of topological distinction beyond standard bulk-based topological phases, study several models displaying such distinction and investigate its physical consequences.

Time evolution with symmetric stochastic action

Peter D. Drummond

Phys. Rev. Research 3, 013240 (2021) - Published 15 March, 2021

This paper describes a probabilistic theory equivalent to quantum mechanics, but with a real action principle and classical fields that evolve both forward and backward in time.

Fate of the Hebel-Slichter peak in superconductors with strong antiferromagnetic fluctuations

D. C. Cavanagh and B. J. Powell

Phys. Rev. Research 3, 013241 (2021) - Published 15 March, 2021

The authors show that antiferromagnetic fluctuations destroy the Hebel-Slichter peak in the nuclear magnetic resonance relaxation rate as shown in experiments on organic and iron-based superconductors.

Hybrid Wannier Chern bands in magic angle twisted bilayer graphene and the quantized anomalous Hall effect

Kasra Hejazi, Xiao Chen, and Leon Balents

Phys. Rev. Research 3, 013242 (2021) - Published 15 March, 2021

This work considers the interaction induced physics in twisted bilayer graphene through the lens of the basis of hybrid Wannier functions.

Faithful derivation of symmetry indicators: A case study for topological superconductors with time-reversal and inversion symmetries

Sheng-Jie Huang and Yi-Ting Hsu

Phys. Rev. Research 3, 013243 (2021) - Published 15 March, 2021

The authors provide a protocol for deriving symmetry indicators that can diagnose the type of Majorana boundary modes for first- and higher-order topological crystalline superconductors.

Adiabatic sensing technique for optimal temperature estimation using trapped ions

Aleksandrina V. Kirkova, Weibin Li, and Peter A. Ivanov

Phys. Rev. Research 3, 013244 (2021) - Published 15 March, 2021

This work presents a method for optimal temperature estimation that saturates the fundamental quantum Cramer-Rao bound using linear ion crystals.

Construction of Dirac spinors for electron vortex beams in background electromagnetic fields

Andre G. Campos, K. Z. Hatsagortsyan, and C. H. Keitel

Phys. Rev. Research 3, 013245 (2021) - Published 15 March, 2021

The authors find solutions to the Dirac equation using a recently developed technique that explores the geometry of the Poincaré group, the underlying symmetry group of relativistic quantum mechanics.

Transient birefringence and dichroism in ZnO studied with fs-time-resolved spectroscopic ellipsometry

O. Herrfurth, S. Richter, M. Rebarz, S. Espinoza, J. Zúñiga-Pérez, C. Deparis, J. Leveillee, A. Schleife, M. Grundmann, J. Andreasson, and R. Schmidt-Grund

Phys. Rev. Research 3, 013246 (2021) - Published 16 March, 2021

The authors obtain the transient dielectric-function tensor of ZnO after femtosecond UV-excitation in the near-IR to near-UV spectral range and analyze the underlying physical processes.

Conservation laws in quantum noninvasive measurements

Stanisław Sołtan, Mateusz Frączak, Wolfgang Belzig, and Adam Bednorz

Phys. Rev. Research 3, 013247 (2021) - Published 17 March, 2021

The authors show that a quantum measurement might prevent the direct confirmation of conservation laws even in the noninvasive limit.

Entanglement and complexity of purification in (1+1)-dimensional free conformal field theories

Hugo A. Camargo, Lucas Hackl, Michal P. Heller, Alexander Jahn, Tadashi Takayanagi, and Bennet Windt

Phys. Rev. Research 3, 013248 (2021) - Published 17 March, 2021

The authors study quantum information-theoretic quantities in Gaussian mixed states, identifying universal properties and providing a comparison with existing results from conformal field theory and holography.

Enantioselective orientation of chiral molecules induced by terahertz pulses with twisted polarization

Ilia Tutunnikov, Long Xu, Robert W. Field, Keith A. Nelson, Yehiam Prior, and Ilya Sh. Averbukh

Phys. Rev. Research 3, 013249 (2021) - Published 17 March, 2021

The authors show enantioselective orientation of chiral molecules in the gas phase using strong terahertz pulses with twisted polarization.

Yukawa-SYK model and self-tuned quantum criticality

Gaopei Pan, Wei Wang, Andrew Davis, Yuxuan Wang, and Zi Yang Meng

Phys. Rev. Research 3, 013250 (2021) - Published 18 March, 2021

The authors use quantum Monte Carlo simulations to show that randomly interacting bosons and fermions in a quantum dots display self-tuned quantum critical behavior, regardless of the boson bare mass.

Acoustic orbital angular momentum Hall effect and realization using a metasurface

Xu-Dong Fan and Likun Zhang

Phys. Rev. Research 3, 013251 (2021) - Published 18 March, 2021

The article reports the orbital Hall effect in acoustics associated with coupling of intrinsic and extrinsic orbital angular momenta via modeling vortex beam propagation in an inhomogeneous medium.

Microscopic electronic structure tomography of Rydberg macrodimers

Simon Hollerith, Jun Rui, Antonio Rubio-Abadal, Kritsana Srakaew, David Wei, Johannes Zeiher, Christian Gross, and Immanuel Bloch

Phys. Rev. Research 3, 013252 (2021) - Published 18 March, 2021

The authors perform precision spectroscopy of vibrational resonances of giant electrostatically bound Rydberg macrodimer molecules and study the electronic wave function symmetries of the molecules.

Optical manipulation of domains in chiral topological superconductors

Tao Yu, Martin Claassen, Dante M. Kennes, and Michael A. Sentef

Phys. Rev. Research 3, 013253 (2021) - Published 18 March, 2021

The authors investigate the requirements for optical enhancement of chiral superconductivity. They study conditions for writing, erasing, and moving domains hosting chiral Majorana modes at their boundaries and propose optically programmable quantum logic gates.

Spectroscopic fingerprints of gapped quantum spin liquids, both conventional and fractonic

Rahul M. Nandkishore, Wonjune Choi, and Yong Baek Kim

Phys. Rev. Research 3, 013254 (2021) - Published 19 March, 2021

The authors show that two-dimensional coherent nonlinear spectroscopy can be used to detect sharp signatures of fractionalized excitations in quantum spin liquids and fractonic matter.

Nonzero spectral gap in several uniformly spin-2 and hybrid spin-1 and spin-2 AKLT models

Wenhan Guo, Nicholas Pomata, and Tzu-Chieh Wei

Phys. Rev. Research 3, 013255 (2021) - Published 19 March, 2021

The authors show that Affleck-Kennedy-Lieb-Tasaki models on several lattices possess a nontrivial spectral gap, including models on the singly decorated diamond lattice and singly decorated kagome lattice and two other two-dimensional uniformly spin-2 models.

Stable states with nonzero entropy under broken PT symmetry

Jingwei Wen, Chao Zheng, Zhangdong Ye, Tao Xin, and Guilu Long

Phys. Rev. Research 3, 013256 (2021) - Published 19 March, 2021

The authors study the dynamic process of entropy and entanglement in a triple-qubit system with a local PT-symmetric Hamiltonian.

Linear Ascending Metrological Algorithm

M. R. Perelshtein, N. S. Kirsanov, V. V. Zemlyanov, A. V. Lebedev, G. Blatter, V. M. Vinokur, and G. B. Lesovik

Phys. Rev. Research 3, 013257 (2021) - Published 19 March, 2021

The authors introduce a Linear Ascending Metrological Algorithm as a quantum protocol for high-precision magnetic field measurements using superconducting transmon devices as sensors operating in a qudit mode.

Diffusive coupling of two well-mixed compartments elucidates elementary principles of protein-based pattern formation

Fridtjof Brauns, Jacob Halatek, and Erwin Frey

Phys. Rev. Research 3, 013258 (2021) - Published 19 March, 2021

This work studies mass-conserving reaction-diffusion systems in the minimal setting of two diffusively coupled compartments.

Space-time focusing and coherence properties of supercontinua in multipass cells

Chao Mei and Günter Steinmeyer

Phys. Rev. Research 3, 013259 (2021) - Published 19 March, 2021

The authors show the role of space-time focusing in the spectral broadening process of multipass cells.

Dissipation engineered directional filter for quantum ratchets

Zlata Fedorova, Christoph Dauer, Anna Sidorenko, Sebastian Eggert, Johann Kroha, and Stefan Linden

Phys. Rev. Research 3, 013260 (2021) - Published 19 March, 2021

The authors investigate how transport rectification is possible in non-adiabatic Hamiltonian quantum ratchets by using a dissipative, dynamic impurity as a direction-dependent filter.

Correlated interface electron gas in infinite-layer nickelate versus cuprate films on SrTiO3(001)

Benjamin Geisler and Rossitza Pentcheva

Phys. Rev. Research 3, 013261 (2021) - Published 19 March, 2021

The authors identify the formation of an interface two-dimensional electron gas and the concomitant depletion of the Nd 5d self-doping band as a general phenomenon in infinite-layer PrNiO2, LaNiO2, and NdNiO2 as well as CaCuO2 and SrCuO2 films on SrTiO3(001).

Quasiperiodic criticality and spin-triplet superconductivity in superconductor-antiferromagnet moiré patterns

Maryam Khosravian and J. L. Lado

Phys. Rev. Research 3, 013262 (2021) - Published 19 March, 2021

The authors present the emergence of quasiperiodic criticality in a moirapose modulation formed by an antiferromagnet and superconductor, showing that in the presence of interactions an emergent spin-triplet superconducting state gets enhanced at the quasiperiodic critical point.

Bimodal behavior of microlasers investigated with a two-channel photon-number-resolving transition-edge sensor system

Marco Schmidt, Isa Hedda Grothe, Sergej Neumeier, Lucas Bremer, Martin von Helversen, Wenera Zent, Boris Melcher, Jörn Beyer, Christian Schneider, Sven Höfling, Jan Wiersig, and Stephan Reitzenstein

Phys. Rev. Research 3, 013263 (2021) - Published 19 March, 2021

The authors apply photon number resolving detectors to explore the photon statistics of bimodal microlasers.

Genuine multipartite entanglement is not a precondition for secure conference key agreement

Giacomo Carrara, Hermann Kampermann, Dagmar Bruß, and Gláucia Murta

Phys. Rev. Research 3, 013264 (2021) - Published 19 March, 2021

The authors show that in a Conference Key Agreement protocol the resource state used at each round of the protocol is not required to be Genuine Multipartite Entangled in order to establish a secret conference key.

Inducing a many-body topological state of matter through Coulomb-engineered local interactions

M. Rösner and J. L. Lado

Phys. Rev. Research 3, 013265 (2021) - Published 19 March, 2021

The authors establish that Coulomb engineering allows for creating many-body topological states, by showing that spatially modulated dielectric screening environments can generate topological modes with no single-particle analog in quantum dot chains.

Synchronization and chaos in systems of coupled inner-ear hair cells

Justin Faber, Hancheng Li, and Dolores Bozovic

Phys. Rev. Research 3, 013266 (2021) - Published 22 March, 2021

This paper explores the nonlinear dynamics of coupled inner-ear hair cells in living tissue and show that the onset of chaotic dynamics in the individual oscillators enhances synchronization and signal detection in the coupled system.

Multiple abrupt phase transitions in urban transport congestion

Aniello Lampo, Javier Borge-Holthoefer, Sergio Gómez, and Albert Solé-Ribalta

Phys. Rev. Research 3, 013267 (2021) - Published 22 March, 2021

The authors study the spatial behavior of traffic bottlenecks and show that the location of the onset of congestion experiences abrupt transitions, namely it shifts away from the center.

Planar Hall effect with sixfold oscillations in a Dirac antiperovskite

D. Huang, H. Nakamura, and H. Takagi

Phys. Rev. Research 3, 013268 (2021) - Published 22 March, 2021

The authors report a planar Hall effect in Sr3SnO wherein the transverse voltage oscillates six times as a magnetic field is rotated once in the plane of the sample.

Multiphoton interaction phase shifts in attosecond science

Mattias Bertolino and Jan Marcus Dahlström

Phys. Rev. Research 3, 013270 (2021) - Published 23 March, 2021

This paper shows that interferometric experiments in attosecond and free-electro lasers are subjected to large phase effects due to the accumulation of interaction phases with each exchanged laser photon in the process.

Surface charge induced Dirac band splitting in a charge density wave material (TaSe4)2I

Hemian Yi, Zengle Huang, Wujun Shi, Lujin Min, Rui Wu, C. M. Polley, Ruoxi Zhang, Yi-Fan Zhao, Ling-Jie Zhou, J. Adell, Xin Gui, Weiwei Xie, Moses H. W. Chan, Zhiqiang Mao, Zhijun Wang, Weida Wu, and Cui-Zu Chang

Phys. Rev. Research 3, 013271 (2021) - Published 23 March, 2021

The authors combine angle-resolved photoemission spectroscopy, scanning tunneling microscopy, core level measurements, and theoretical calculations to demonstrate the surface charge induced Dirac band splitting in a charge density wave material, (TaSe4)2I.

Evidence of attraction between charge carriers in a doped Mott insulator

Emil Blomquist and Johan Carlström

Phys. Rev. Research 3, 013272 (2021) - Published 23 March, 2021

The authors present calculations for two dopants in a Mott insulator at finite temperature. In the attractive regime, strong distortions of the spin background appear, as new types of correlations are generated by the carriers.

Thermodynamic uncertainty relation for systems with unidirectional transitions

Arnab Pal, Shlomi Reuveni, and Saar Rahav

Phys. Rev. Research 3, 013273 (2021) - Published 23 March, 2021

The authors derive a thermodynamic uncertainty relation for stochastic processes with unidirectional transitions and apply it on a random walk with stochastic resetting, and on the Michaelis-Menten model of enzymatic catalysis.

Numerical calculations of the finite key rate for general quantum key distribution protocols

Ian George, Jie Lin, and Norbert Lütkenhaus

Phys. Rev. Research 3, 013274 (2021) - Published 24 March, 2021

This article presents a method for determining tight, finite key rates numerically. The method relies in a theorem allowing to data-process the parameter estimation statistics in multiple ways while preserving the same security statement.

Spin and orbital Edelstein effects in a two-dimensional electron gas: Theory and application to SrTiO3 interfaces

Annika Johansson, Börge Göbel, Jürgen Henk, Manuel Bibes, and Ingrid Mertig

Phys. Rev. Research 3, 013275 (2021) - Published 24 March, 2021

The authors study the electrically induced magnetization at SrTiO3 interfaces that originates from nonequilibrium spin and orbital moments.

Design of an optomagnonic crystal: Towards optimal magnon-photon mode matching at the microscale

Jasmin Graf, Sanchar Sharma, Hans Huebl, and Silvia Viola Kusminskiy

Phys. Rev. Research 3, 013277 (2021) - Published 24 March, 2021

The authors propose an optomagnonic crystal consisting of a Faraday-active magnetic dielectric which is periodically patterned at the microscale and supports both photon and magnon modes.

Topological insulators in the NaCaBi family with large spin-orbit coupling gaps

Dexi Shao, Zhaopeng Guo, Xianxin Wu, Simin Nie, Jian Sun, Hongming Weng, and Zhijun Wang

Phys. Rev. Research 3, 013278 (2021) - Published 25 March, 2021

The authors predict that a NaCaBi family behave as three-dimensional strong topological insulators with large band gaps induced by spin-orbit coupling.

Limits and security of free-space quantum communications

Stefano Pirandola

Phys. Rev. Research 3, 013279 (2021) - Published 25 March, 2021

This work establishes the limits for free-space quantum communications under the effects of diffraction, atmospheric extinction, pointing error, turbulence, and background noise.

Microphase separation in active filament systems maintained by cyclic dynamics of cluster size and order

Lorenz Huber, Timo Krüger, and Erwin Frey

Phys. Rev. Research 3, 013280 (2021) - Published 25 March, 2021

The authors analyze the multiscale dynamics during the flocking transition in-silico and show that local particle clusters of different sizes and orders are important for the formation of polar order.

Custom flow in molecular dynamics

Johannes Renner, Matthias Schmidt, and Daniel de las Heras

Phys. Rev. Research 3, 013281 (2021) - Published 26 March, 2021

The authors develop a method to numerically find the external force that generates the desired dynamics in a many-body inertial system.

Functional theory for Bose-Einstein condensates

Julia Liebert and Christian Schilling

Phys. Rev. Research 3, 013282 (2021) - Published 26 March, 2021

The authors derive the universal one-matrix functional for Bose-Einstein condensates and show the existence of a Bose-Einstein force which identifies quantum depletion as a direct consequence of the geometry of density matrices.

Numerical calculation of dipolar-quantum-droplet stationary states

Au-Chen Lee, D. Baillie, and P. B. Blakie

Phys. Rev. Research 3, 013283 (2021) - Published 26 March, 2021

The authors present an accurate method for calculating dipolar quantum droplet states suitable for characterising the energetic stability of circulating droplets.

Klein scattering of spin-1 Dirac-Weyl wave and localized surface plasmon

Hong-Ya Xu, Liang Huang, and Ying-Cheng Lai

Phys. Rev. Research 3, 013284 (2021) - Published 26 March, 2021

This paper develops a theory for spin-1 Dirac-Weyl particles and unveils an analogy between localized surface plasmon and Klein tunneling resonances.

Quantum simulation of Cayley-tree Ising Hamiltonians with three-dimensional Rydberg atoms

Yunheung Song, Minhyuk Kim, Hansub Hwang, Woojun Lee, and Jaewook Ahn

Phys. Rev. Research 3, 013286 (2021) - Published 29 March, 2021

The authors report the quasiadiabatic ground-state preparation of an Ising-type Hamiltonian on Cayley-tree geometries of Rydberg atoms in three-dimensional arrangements of optical tweezers.

Local signatures of electron-electron scattering in an electronic cavity

Carolin Gold, Beat A. Bräm, Richard Steinacher, Tobias Krähenmann, Andrea Hofmann, Christian Reichl, Werner Wegscheider, Mansour Shayegan, Klaus Ensslin, and Thomas Ihn

Phys. Rev. Research 3, 013287 (2021) - Published 29 March, 2021

The authors study electron-electron scattering in an electronic cavity on a local scale and observe conductance modulations behind a quantum point contact.

Weyl Josephson circuits

Valla Fatemi, Anton R. Akhmerov, and Landry Bretheau

Phys. Rev. Research 3, 013288 (2021) - Published 29 March, 2021

The authors propose to simulate topological band structures with in-situ tunable Josephson tunnel junction quantum circuits.

Transconductance quantization in a topological Josephson tunnel junction circuit

L. Peyruchat, J. Griesmar, J.-D. Pillet, and Ç. Ö. Girit

Phys. Rev. Research 3, 013289 (2021) - Published 29 March, 2021

The authors show that Josephson tunnel junctions are universal quantum electrical circuit elements interrelating voltage, current, and resistance by fundamental constants.

Artificial electric field and electron hydrodynamics

Omid Tavakol and Yong Baek Kim

Phys. Rev. Research 3, 013290 (2021) - Published 31 March, 2021

The authors study how an artificial electric field generated by electron-electron interaction or electron-phonon interaction modifies electrons’ hydrodynamic properties in an inversion-breaking system.

General approach to state-dependent optical-tweezer traps for polar molecules

L. Caldwell and M. R. Tarbutt

Phys. Rev. Research 3, 013291 (2021) - Published 31 March, 2021

This article describes a general approach to controlling the distance between a pair of trapped molecules down to about a hundred nanometers, by using bichromatic optical tweezer traps and the tensor Stark shift.

Optimal noise estimation from syndrome statistics of quantum codes

Thomas Wagner, Hermann Kampermann, Dagmar Bruß, and Martin Kliesch

Phys. Rev. Research 3, 013292 (2021) - Published 31 March, 2021

The authors provide a method that estimates the noise on a quantum device from the information obtained during error correction.

Hyperfine structure of the 2P3 state in Be9 and the nuclear quadrupole moment

Mariusz Puchalski, Jacek Komasa, and Krzysztof Pachucki

Phys. Rev. Research 3, 013293 (2021) - Published 31 March, 2021

The authors determine the deformation of the beryllium-9 nucleus in terms of the quadrupole moment using from the hyperfine splitting of the atomic triplet 2P state.

Characterization of 1- and 2μm-wavelength laser-produced microdroplet-tin plasma for generating extreme-ultraviolet light

R. Schupp, L. Behnke, J. Sheil, Z. Bouza, M. Bayraktar, W. Ubachs, R. Hoekstra, and O. O. Versolato

Phys. Rev. Research 3, 013294 (2021) - Published 31 March, 2021

The authors investigate the characteristics of EUV light emission from tin-microdroplet plasmas driven by 1 and 2 micron wavelength solid-state lasers.

Steady-state Fano coherences in a V-type system driven by polarized incoherent light

Suyesh Koyu, Amro Dodin, Paul Brumer, and Timur V. Tscherbul

Phys. Rev. Research 3, 013295 (2021) - Published 31 March, 2021

The authors explore the properties of noise-induced Fano coherences generated in a three-level quantum V-system continuously pumped by polarized incoherent light in the absence of coherent driving.

Sensitive single-photon test of extended quantum theory with two-dimensional hexagonal boron nitride

Tobias Vogl, Heiko Knopf, Maximilian Weissflog, Ping Koy Lam, and Falk Eilenberger

Phys. Rev. Research 3, 013296 (2021) - Published 31 March, 2021

The authors show the disappearance of higher-order interference using single-photons emitted from two-dimensional hexagonal boron nitride.

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