Hikaru Watanabe and Youichi Yanase
Phys. Rev. X 11, 011001 (2021) - Published 4 January, 2021
A new classification of photocurrent responses in light of symmetry violations in the presence of magnetic order unveils two new types of photocurrent that can be readily tuned and enhanced by topological electronic structure in solids.
A. Amorese, B. Leedahl, M. Sundermann, H. Gretarsson, Z. Hu, H.-J. Lin, C. T. Chen, M. Schmidt, H. Borrmann, Yu. Grin, A. Severing, M. W. Haverkort, and L. H. Tjeng
Phys. Rev. X 11, 011002 (2021) - Published 5 January, 2021
A novel experimental method provides direct images of excited states in a transition-metal compound without the need for complex calculations, a major step in understanding the rich physics of these materials.
Shiqi Yang, Xiaolong Xu, Yaozheng Zhu, Ruirui Niu, Chunqiang Xu, Yuxuan Peng, Xing Cheng, Xionghui Jia, Yuan Huang, Xiaofeng Xu, Jianming Lu, and Yu Ye
Phys. Rev. X 11, 011003 (2021) - Published 6 January, 2021
Experiments reveal a host of unusual magnetic behaviors in the recently discovered layered magnetic topological insulator MnBiTe, paving the way for further study of its quantum properties.
Peijie Zhou, Xin Gao, Xiaoli Li, Linxi Li, Caoyuan Niu, Qi Ouyang, Huiqiang Lou, Tiejun Li, and Fangting Li
Phys. Rev. X 11, 011004 (2021) - Published 7 January, 2021
Experiments on single cells of different budding yeast mutation strains reveal details about activation of a key genetic regulation mechanism, underlining the important role of noise in cell signaling pathways.
Kazuhiro Morimoto, Ming-Lo Wu, Andrei Ardelean, and Edoardo Charbon
Phys. Rev. X 11, 011005 (2021) - Published 8 January, 2021
Using a megapixel high-speed camera, researchers reconstructed the trajectory of a laser pulse in time and 3D space.
Yong Wang, Junjie Wang, Andreas Hermann, Cong Liu, Hao Gao, Erio Tosatti, Hui-Tian Wang, Dingyu Xing, and Jian Sun
Phys. Rev. X 11, 011006 (2021) - Published 11 January, 2021
Simulations show that thanks to a clear electronic mechanism, even the simplest crystal structure—the simple cubic phase of calcium—exhibits “chain melting,” in which 1D chains of atoms within a solid begin to move in concert as temperature increases.
Xintong Li, Changwei Zou, Ying Ding, Hongtao Yan, Shusen Ye, Haiwei Li, Zhenqi Hao, Lin Zhao, Xingjiang Zhou, and Yayu Wang
Phys. Rev. X 11, 011007 (2021) - Published 12 January, 2021
Checkerboard charge patterns in a cuprate give way to glassy “charge puddles” as doping density increases, a finding that may help connect the emergence of charge orders with high-temperature superconductivity of these materials.
R. Finkelstein, O. Lahad, I. Cohen, O. Davidson, S. Kiriati, E. Poem, and O. Firstenberg
Phys. Rev. X 11, 011008 (2021) - Published 13 January, 2021
A new technique for continuously mitigating decoherence among the various parts of a quantum system offers a novel low-noise approach to maintaining qubit stability.
Matthieu Barbier, Claire de Mazancourt, Michel Loreau, and Guy Bunin
Phys. Rev. X 11, 011009 (2021) - Published 14 January, 2021
If many mechanisms ensure coexistence of species in an ecosystem, characteristic statistical patterns in interactions between species’ populations should arise, allowing for tests of theories about biodiversity persistence.
Helin Zhang, Srivatsan Chakram, Tanay Roy, Nathan Earnest, Yao Lu, Ziwen Huang, D. K. Weiss, Jens Koch, and David I. Schuster
Phys. Rev. X 11, 011010 (2021) - Published 15 January, 2021
A set of protocols for initializing, controlling, and reading out a qubit design known as “heavy fluxonium,” operated in a previously unexplored regime, provides excellent coherence times and fast high-fidelity gates.
A. Signoles, T. Franz, R. Ferracini Alves, M. Gärttner, S. Whitlock, G. Zürn, and M. Weidemüller
Phys. Rev. X 11, 011011 (2021) - Published 19 January, 2021
Experiments reveal relaxation behavior in an isolated quantum system similar to that observed in classical glasses, hinting at an overarching framework for slow relaxation dynamics.
Fabian Baumann, Philipp Lorenz-Spreen, Igor M. Sokolov, and Michele Starnini
Phys. Rev. X 11, 011012 (2021) - Published 20 January, 2021
By embedding opinions in a nonorthogonal topic space, a new model shows that a reinforcement mechanism driven by homophilic social interactions reproduces extreme and correlated opinion states found in surveys.
Erik S. Sørensen, Andrei Catuneanu, Jacob S. Gordon, and Hae-Young Kee
Phys. Rev. X 11, 011013 (2021) - Published 21 January, 2021
A novel analysis of a leading model of quantum spin liquids reveals an incredibly rich phase diagram with 15 distinct phases, a finding that will guide searches for spin liquids in 2D honeycomb materials.
Yuan Da Liao, Jian Kang, Clara N. Breiø, Xiao Yan Xu, Han-Qing Wu, Brian M. Andersen, Rafael M. Fernandes, and Zi Yang Meng
Phys. Rev. X 11, 011014 (2021) - Published 22 January, 2021
Quantum Monte Carlo simulations of so-called “magic angle” twisted bilayer graphene reveal three novel insulating phases that may help elucidate the origin of unusual electronic behaviors in this material.
Eunjong Kim, Xueyue Zhang, Vinicius S. Ferreira, Jash Banker, Joseph K. Iverson, Alp Sipahigil, Miguel Bello, Alejandro González-Tudela, Mohammad Mirhosseini, and Oskar Painter
Phys. Rev. X 11, 011015 (2021) - Published 25 January, 2021
A metamaterial waveguide with embedded qubits offers a new platform for probing and controlling topological phenomena.
Ze-Guo Chen, Weiwei Zhu, Yang Tan, Licheng Wang, and Guancong Ma
Phys. Rev. X 11, 011016 (2021) - Published 26 January, 2021
A new type of 4D higher-order topological system demonstrated in an acoustic crystal offers a powerful and novel approach to wave-steering applications.
Gavin B. Osterhoudt, Yaxian Wang, Christina A. C. Garcia, Vincent M. Plisson, Johannes Gooth, Claudia Felser, Prineha Narang, and Kenneth S. Burch
Phys. Rev. X 11, 011017 (2021) - Published 27 January, 2021
Unusual interactions occur between phonons and electrons in the topological semimetal tungsten diphosphide, a finding that could explain some of the material’s strange properties.
Jiaqi Hu, Zhaorong Wang, Seonghoon Kim, Hui Deng, Sebastian Brodbeck, Christian Schneider, Sven Höfling, Nai H. Kwong, and Rolf Binder
Phys. Rev. X 11, 011018 (2021) - Published 28 January, 2021
Experiments show signatures of a long-sought-after condensed quantum phase—the so-called Bardeen-Cooper-Schrieffer state—in a semiconductor microcavity, laying the foundation for future efficient semiconductor lasers.
Clemens Matthiesen, Qian Yu, Jinen Guo, Alberto M. Alonso, and Hartmut Häffner
Phys. Rev. X 11, 011019 (2021) - Published 29 January, 2021
Long-time trapping of a single electron could allow the particle to be used as an efficient quantum bit.
Andrew M. Childs, Yuan Su, Minh C. Tran, Nathan Wiebe, and Shuchen Zhu
Phys. Rev. X 11, 011020 (2021) - Published 1 February, 2021
Product formulas offer a powerful, simple approach to quantum simulation. A new theory quantifying their errors puts these algorithms on a rigorous foundation, showcasing their superiority over other methods.
H. Murayama, K. Ishida, R. Kurihara, T. Ono, Y. Sato, Y. Kasahara, H. Watanabe, Y. Yanase, G. Cao, Y. Mizukami, T. Shibauchi, Y. Matsuda, and S. Kasahara
Phys. Rev. X 11, 011021 (2021) - Published 2 February, 2021
Evidence of an exotic intermediate state—an anapole state—between the liquid and solid phases of electrons in a transition-metal oxide provides the first in-depth look at this long-sought, mysterious phase.
Pavel Kos, Bruno Bertini, and Tomaž Prosen
Phys. Rev. X 11, 011022 (2021) - Published 3 February, 2021
Dual-unitary quantum circuits are a class of many-body models that allow for direct computation of useful diagnostics. A new study shows that important features of these models are stable under perturbations.
Anirudh Krishna and David Poulin
Phys. Rev. X 11, 011023 (2021) - Published 4 February, 2021
One class of quantum error-correcting codes—hypergraph product codes—may offer fault tolerance with low hardware overhead. A new proposal shows how to perform universal quantum gates with these codes.
Matthew J. Coak, David M. Jarvis, Hayrullo Hamidov, Andrew R. Wildes, Joseph A. M. Paddison, Cheng Liu, Charles R. S. Haines, Ngoc T. Dang, Sergey E. Kichanov, Boris N. Savenko, Sungmin Lee, Marie Kratochvílová, Stefan Klotz, Thomas C. Hansen, Denis P. Kozlenko, Je-Geun Park, and Siddharth S. Saxena
Phys. Rev. X 11, 011024 (2021) - Published 5 February, 2021
High-pressure neutron studies of so-called magnetic graphene unveil exotic new states and behaviors as the material transitions from an insulator to a metal when compressed.
Rinse W. Liefferink, Feng-Chun Hsia, Bart Weber, and Daniel Bonn
Phys. Rev. X 11, 011025 (2021) - Published 8 February, 2021
A new approach for studying friction on ice helps explain why the ease of sliding depends strongly on temperature, contact pressure, and speed.
Francesco Andreoli, Michael J. Gullans, Alexander A. High, Antoine Browaeys, and Darrick E. Chang
Phys. Rev. X 11, 011026 (2021) - Published 9 February, 2021
A new theory explains the lack of variation in the refractive indices of atomic gases.
A. Opremcak, C. H. Liu, C. Wilen, K. Okubo, B. G. Christensen, D. Sank, T. C. White, A. Vainsencher, M. Giustina, A. Megrant, B. Burkett, B. L. T. Plourde, and R. McDermott
Phys. Rev. X 11, 011027 (2021) - Published 10 February, 2021
Fast, high-fidelity measurement of a superconducting qubit with a microwave photon counter offers a strong foundation for error correction in future, robust, large-scale quantum computers.
Jasminder S. Sidhu, Yingkai Ouyang, Earl T. Campbell, and Pieter Kok
Phys. Rev. X 11, 011028 (2021) - Published 11 February, 2021
New analysis shows how to calculate the fundamental precision bounds of a quantum sensor that measures two signals simultaneously, solving a difficult problem in quantum estimation theory.
Stefano M. Cavaletto, Daniel Keefer, and Shaul Mukamel
Phys. Rev. X 11, 011029 (2021) - Published 12 February, 2021
Temporal and spectral resolution of x-ray spectroscopy can be improved by exploiting correlations of existing stochastic x-ray fields, allowing for new investigations of electron and nuclear dynamics in molecules.
Matteo Ippoliti, Michael J. Gullans, Sarang Gopalakrishnan, David A. Huse, and Vedika Khemani
Phys. Rev. X 11, 011030 (2021) - Published 15 February, 2021
Measurements of a quantum system can support distinct entanglement phases and transitions, a counterintuitive result with implications for creating robust, fault-tolerant quantum information devices.
M.-T. Huebsch, T. Nomoto, M.-T. Suzuki, and R. Arita
Phys. Rev. X 11, 011031 (2021) - Published 16 February, 2021
State-of-the-art many-body simulations can predict the magnetic ground state of over 100 materials from first principles, pushing the exploration and design of magnetic materials to a new era.
Martin Rymarz, Stefano Bosco, Alessandro Ciani, and David P. DiVincenzo
Phys. Rev. X 11, 011032 (2021) - Published 17 February, 2021
A newly proposed superconducting circuit architecture employs a synthetic magnetic field to create a qubit that is intrinsically protected from noise.
Steffen Grosser, Jürgen Lippoldt, Linda Oswald, Matthias Merkel, Daniel M. Sussman, Frédéric Renner, Pablo Gottheil, Erik W. Morawetz, Thomas Fuhs, Xiaofan Xie, Steve Pawlizak, Anatol W. Fritsch, Benjamin Wolf, Lars-Christian Horn, Susanne Briest, Bahriye Aktas, M. Lisa Manning, and Josef A. Käs
Phys. Rev. X 11, 011033 (2021) - Published 17 February, 2021
In tightly packed tissues, a cancer cell’s motility is linked to the shape of the cell and of its nucleus.
Wen-Han Kao, Johannes Knolle, Gábor B. Halász, Roderich Moessner, and Natalia B. Perkins
Phys. Rev. X 11, 011034 (2021) - Published 18 February, 2021
A small concentration of vacancies in the Kitaev model of quantum spin liquids (QSLs) alter its low-energy physics, offering a plausible explanation for recent experimental results on the QSL-hosting compound HLiIrO.
Manolo R. Lam, Natalie Peter, Thorsten Groh, Wolfgang Alt, Carsten Robens, Dieter Meschede, Antonio Negretti, Simone Montangero, Tommaso Calarco, and Andrea Alberti
Phys. Rev. X 11, 011035 (2021) - Published 19 February, 2021
Researchers have transported an atom between two locations in the shortest possible time, an achievement that has implications for quantum technologies.
C. Veit, N. Zuber, O. A. Herrera-Sancho, V. S. V. Anasuri, T. Schmid, F. Meinert, R. Löw, and T. Pfau
Phys. Rev. X 11, 011036 (2021) - Published 22 February, 2021
Researchers have developed an ion-optics-based quantum microscope that has sufficient resolution to image individual atoms.
J. Hertkorn, J.-N. Schmidt, F. Böttcher, M. Guo, M. Schmidt, K. S. H. Ng, S. D. Graham, H. P. Büchler, T. Langen, M. Zwierlein, and T. Pfau
Phys. Rev. X 11, 011037 (2021) - Published 23 February, 2021
Observations of fluctuations in a dipolar quantum gas provide insight into the mechanism underlying the superfluid-to-supersolid phase transition.
Stefan Richter, Matthew Thornton, Imran Khan, Hannah Scott, Kevin Jaksch, Ulrich Vogl, Birgit Stiller, Gerd Leuchs, Christoph Marquardt, and Natalia Korolkova
Phys. Rev. X 11, 011038 (2021) - Published 24 February, 2021
A demonstration of “cryptographic agility” in quantum communications offers a robust way to adapt security protocols in the face of a novel attack.
Ruie Lu, Hongyi Sun, Shiv Kumar, Yuan Wang, Mingqiang Gu, Meng Zeng, Yu-Jie Hao, Jiayu Li, Jifeng Shao, Xiao-Ming Ma, Zhanyang Hao, Ke Zhang, Wumiti Mansuer, Jiawei Mei, Yue Zhao, Cai Liu, Ke Deng, Wen Huang, Bing Shen, Kenya Shimada, Eike F. Schwier, Chang Liu, Qihang Liu, and Chaoyu Chen
Phys. Rev. X 11, 011039 (2021) - Published 25 February, 2021
Experiments show that an intrinsic magnetic topological insulator is a good platform for exploring half-quantized surface resistivity, a hallmark of elusive axion dynamics.
T. Mendes-Santos, X. Turkeshi, M. Dalmonte, and Alex Rodriguez
Phys. Rev. X 11, 011040 (2021) - Published 26 February, 2021
A generic statistical property of large data sets that describe equilibrium systems can reveal phase transition properties, thus introducing a new data-based viewpoint on phase transitions.
Yi Zhang, Kun Jiang, Fuchun Zhang, Jian Wang, and Ziqiang Wang
Phys. Rev. X 11, 011041 (2021) - Published 1 March, 2021
Theoretical work shows that quasi-one-dimensional topological superconductors can emerge in certain 1D quantum structures, offering a path to engineering behaviors essential to quantum computing.
M. Goryca, X. Zhang, J. Li, A. L. Balk, J. D. Watts, C. Leighton, C. Nisoli, P. Schiffer, and S. A. Crooker
Phys. Rev. X 11, 011042 (2021) - Published 2 March, 2021
Arrays of nanomagnets known as artificial spin ice can host high densities of mobile magnetic monopolelike quasiparticles at room temperature, opening the door to new studies of magnetic charges in synthetic matter.
Babak Vajdi Hokmabad, Ranabir Dey, Maziyar Jalaal, Devaditya Mohanty, Madina Almukambetova, Kyle A. Baldwin, Detlef Lohse, and Corinna C. Maass
Phys. Rev. X 11, 011043 (2021) - Published 3 March, 2021
Microscopy experiments reveal how oil droplets dissolving in a water solution change up their “swimming” patterns as the viscosity of the solution changes.
Armita Nourmohammad and Ceyhun Eksin
Phys. Rev. X 11, 011044 (2021) - Published 4 March, 2021
Optimal control for artificial selection offers a new paradigm for directing stochastic evolution of multivariate molecular characteristics and phenotypes toward desired targets.
Yuki Yoshikawa, Naoyuki Sakumichi, Ung-il Chung, and Takamasa Sakai
Phys. Rev. X 11, 011045 (2021) - Published 5 March, 2021
Contrary to common belief, the softness of polymer gels is determined by negative energy elasticity and not only by entropy elasticity, a key finding for designing gels used in medical applications at various temperatures.
Emanuel Schwarzhans, Maximilian P. E. Lock, Paul Erker, Nicolai Friis, and Marcus Huber
Phys. Rev. X 11, 011046 (2021) - Published 8 March, 2021
The second law of thermodynamics limits the potential for any system to serve as a clock, while the system’s complexity determines how well this can be achieved in practice.
Tomotaka Kuwahara, Álvaro M. Alhambra, and Anurag Anshu
Phys. Rev. X 11, 011047 (2021) - Published 9 March, 2021
An analysis of the “area law” for thermal states shows the presence of much weaker correlations than previously believed, providing an avenue for more efficient simulations of quantum many-body systems.
Hanlin Sun, David Saad, and Andrey Y. Lokhov
Phys. Rev. X 11, 011048 (2021) - Published 10 March, 2021
To predict and control the spread of collaborative epidemics or competing marketing campaigns, new computationally efficient algorithms offer crucial insights in scenarios where multiple processes interact.
Henrikh M. Baghramyan, Fabio Della Sala, and Cristian Ciracì
Phys. Rev. X 11, 011049 (2021) - Published 11 March, 2021
A generalization of quantum hydrodynamic theory provides a new, accurate approach to calculating the optical response of a plasmonic system beyond classical electromagnetism.
Emily Been, Wei-Sheng Lee, Harold Y. Hwang, Yi Cui, Jan Zaanen, Thomas Devereaux, Brian Moritz, and Chunjing Jia
Phys. Rev. X 11, 011050 (2021) - Published 11 March, 2021
A complex interplay of electric and magnetic behaviors resides in the parent compound of a nickel oxide material known to host high-temperature superconductivity, a finding that may guide studies into this phenomenon.
Guang Shi and D. Thirumalai
Phys. Rev. X 11, 011051 (2021) - Published 15 March, 2021
A new computational method solves a major problem in biology—how to obtain 3D coordinates of positions on chromosomes from 2D “contact maps” that encode distances between the positions.
Venkata K. Ramaswamy, Samuel C. Musson, Chris G. Willcocks, and Matteo T. Degiacomi
Phys. Rev. X 11, 011052 (2021) - Published 15 March, 2021
A trained neural network predicts intermediate shapes for proteins, opening the door to new techniques for pharmaceutical discovery and design.
Nicolás P. Müller, Juan Ignacio Polanco, and Giorgio Krstulovic
Phys. Rev. X 11, 011053 (2021) - Published 16 March, 2021
Simulations of turbulent quantum and classical fluids show that the collective behavior of vortices in quantum flows within different-sized regions is very similar to that in classical turbulence.
Jeffrey C. Everts and Miha Ravnik
Phys. Rev. X 11, 011054 (2021) - Published 16 March, 2021
Topological defects in nematic electrolytes can separate electric charges and stabilize them without the need for additional surfaces, with possible applications in microelectronics.
Michele Buzzi, Gregor Jotzu, Andrea Cavalleri, J. Ignacio Cirac, Eugene A. Demler, Bertrand I. Halperin, Mikhail D. Lukin, Tao Shi, Yao Wang, and Daniel Podolsky
Phys. Rev. X 11, 011055 (2021) - Published 17 March, 2021
A novel technique for probing photoinduced superconductivity supports the existence of such a state in the compound KC by demonstrating large Higgs mode oscillations.
Luis F. Alday and Xinan Zhou
Phys. Rev. X 11, 011056 (2021) - Published 18 March, 2021
A mathematical framework for organizing correlators in conformal field theory (CFT) and corresponding scattering amplitudes in anti–de Sitter (AdS) space greatly enhances the computing power of AdS/CFT for analyzing quantum gravity.
Konrad Viebahn, Joaquín Minguzzi, Kilian Sandholzer, Anne-Sophie Walter, Manish Sajnani, Frederik Görg, and Tilman Esslinger
Phys. Rev. X 11, 011057 (2021) - Published 19 March, 2021
Floquet engineering uses periodic driving to design novel quantum matter but is limited by dissipation. Experiments show how to use interference between related drives to combat these losses.
Thomas Schäfer et al.
Phys. Rev. X 11, 011058 (2021) - Published 23 March, 2021
An extensive assessment of the ability of many computational methods to tackle the fundamental model of interacting particles, the Hubbard model, reveals the nature and role of magnetic fluctuations.
C. J. Butler, M. Yoshida, T. Hanaguri, and Y. Iwasa
Phys. Rev. X 11, 011059 (2021) - Published 24 March, 2021
By injecting electrons into the Mott state of tantalum disulfide, experiments reveal new, unexpected electronic behaviors that could shed light on the underlying interactions that create this exotic state.
H. Thoma, V. Hutanu, H. Deng, V. E. Dmitrienko, P. J. Brown, A. Gukasov, G. Roth, and M. Angst
Phys. Rev. X 11, 011060 (2021) - Published 25 March, 2021
Experiments show that polarized neutron diffraction is an effective tool for determining the direction of a basic magnetic interaction that impacts spintronics devices and topological materials.
Patryk Lipka-Bartosik and Paul Skrzypczyk
Phys. Rev. X 11, 011061 (2021) - Published 26 March, 2021
Counter to intuition, a mathematical analysis shows that any quantum state can be a “quantum catalyst”—a special reusable state that makes certain manipulations possible—as long as there are enough copies.
Emmanuel Siéfert, Ido Levin, and Eran Sharon
Phys. Rev. X 11, 011062 (2021) - Published 29 March, 2021
A new mechanism to engineer residually stressed thin sheets exploits the intrinsic tendency of the sheet to bend, a key insight for developing self-shaping materials.
Shlomo S. Razamat and David Tong
Phys. Rev. X 11, 011063 (2021) - Published 31 March, 2021
New mathematical models show that it is possible for “chiral” fermions to acquire mass without the electroweak symmetry breaking that comes from the Higgs boson.
Pertti J. Hakonen and Edouard B. Sonin
Phys. Rev. X 11, 018001 (2021) - Published 12 March, 2021
A. Murani, N. Bourlet, H. le Sueur, F. Portier, C. Altimiras, D. Esteve, H. Grabert, J. Stockburger, J. Ankerhold, and P. Joyez
Phys. Rev. X 11, 018002 (2021) - Published 12 March, 2021
Dan Cogan, Oded Kenneth, Netanel H. Lindner, Giora Peniakov, Caspar Hopfmann, Dan Dalacu, Philip J. Poole, Pawel Hawrylak, and David Gershoni
Phys. Rev. X 11, 019901 (2021) - Published 27 January, 2021