Volume 122, Issue 20

24 May 2019

Browse Issues:

On the Cover

By imposing Robin boundary conditions in the Hartle-Hawking formulation of quantum gravity (middle), one can exclude off-shell geometries with singularities (right), allowing for a consistent path-integral summation, the sum being dominated by a no-boundary geometry (left).

From the article:

No-Boundary Proposal as a Path Integral with Robin Boundary Conditions
Alice Di Tucci and Jean-Luc Lehners
Phys. Rev. Lett. 122, 201302 (2019)

EDITORIALS, ESSAYS, and ANNOUNCEMENTS

Essay: Quantum Hall Effect and the New International System of Units

Klaus von Klitzing

Phys. Rev. Lett. 122, 200001 (2019) - Published 20 May, 2019

HIGHLIGHTED ARTICLES

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Contact and Sum Rules in a Near-Uniform Fermi Gas at Unitarity

C. Carcy, S. Hoinka, M. G. Lingham, P. Dyke, C. C. N. Kuhn, H. Hu, and C. J. Vale

Phys. Rev. Lett. 122, 203401 (2019) - Published 23 May, 2019

Cold-atom experiments probe how likely atoms are to pair up in strongly interacting fermion systems.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Spectral Response and Contact of the Unitary Fermi Gas

Biswaroop Mukherjee, Parth B. Patel, Zhenjie Yan, Richard J. Fletcher, Julian Struck, and Martin W. Zwierlein

Phys. Rev. Lett. 122, 203402 (2019) - Published 23 May, 2019

Cold-atom experiments probe how likely atoms are to pair up in strongly interacting fermion systems.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Defect-Free Assembly of 2D Clusters of More Than 100 Single-Atom Quantum Systems

Daniel Ohl de Mello, Dominik Schäffner, Jan Werkmann, Tilman Preuschoff, Lars Kohfahl, Malte Schlosser, and Gerhard Birkl

Phys. Rev. Lett. 122, 203601 (2019) - Published 20 May, 2019

Researchers trap 111 neutral atoms in a predefined, defect-free motif using a new method that could, in the foreseeable future, control one million such atoms.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields

Leon C. Camenzind, Liuqi Yu, Peter Stano, Jeramy D. Zimmerman, Arthur C. Gossard, Daniel Loss, and Dominik M. Zumbühl

Phys. Rev. Lett. 122, 207701 (2019) - Published 22 May, 2019

A new experimental method provides a way to determine the 3D confining potential of an electron in a quantum dot, allowing improved control over the electron’s spin.

FEATURED IN PHYSICS

Criticality between Cortical States

Antonio J. Fontenele, Nivaldo A. P. de Vasconcelos, Thaís Feliciano, Leandro A. A. Aguiar, Carina Soares-Cunha, Bárbara Coimbra, Leonardo Dalla Porta, Sidarta Ribeiro, Ana João Rodrigues, Nuno Sousa, Pedro V. Carelli, and Mauro Copelli

Phys. Rev. Lett. 122, 208101 (2019) - Published 21 May, 2019

Researchers observe a critical point—a feature indicative of a continuous phase transition—in the brain’s electrical activity as it switches from an asleep-like to an awake-like state.

EDITORS' SUGGESTION

Direct Laser Cooling to Bose-Einstein Condensation in a Dipole Trap

Alban Urvoy, Zachary Vendeiro, Joshua Ramette, Albert Adiyatullin, and Vladan Vuletić

Phys. Rev. Lett. 122, 203202 (2019) - Published 24 May, 2019

A new scheme for cooling $^{87}$ Rb to Bose-Einstein condensation uses only lasers, unlike the usual method combining laser and evaporation cooling.

EDITORS' SUGGESTION

Standing Waves Induced by Valley-Mismatched Domains in Ferroelectric SnTe Monolayers

Kai Chang, Brandon J. Miller, Hao Yang, Haicheng Lin, Stuart S. P. Parkin, Salvador Barraza-Lopez, Qi-Kun Xue, Xi Chen, and Shuai-Hua Ji

Phys. Rev. Lett. 122, 206402 (2019) - Published 24 May, 2019

Mismatched valleys across electrically neutral domain walls of a 2D ferroelectric material are shown to induce quasiparticle standing waves.

EDITORS' SUGGESTION

All-Microwave Control and Dispersive Readout of Gate-Defined Quantum Dot Qubits in Circuit Quantum Electrodynamics

P. Scarlino, D. J. van Woerkom, A. Stockklauser, J. V. Koski, M. C. Collodo, S. Gasparinetti, C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin, and A. Wallraff

Phys. Rev. Lett. 122, 206802 (2019) - Published 22 May, 2019

A superconducting resonator coupled to a semiconductor double quantum dot allows for a detailed study of coherence properties of charge qubits.

EDITORS' SUGGESTION

Unexpected Stretching of Entangled Ring Macromolecules

Q. Huang, J. Ahn, D. Parisi, T. Chang, O. Hassager, S. Panyukov, M. Rubinstein, and D. Vlassopoulos

Phys. Rev. Lett. 122, 208001 (2019) - Published 22 May, 2019

Macromolecules without free ends respond to uniaxial stretching in a way that distinguishes them from any other polymer.

LETTERS

General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Metric-Torsion Duality of Optically Chiral Structures

Yongliang Zhang, Lina Shi, Ruo-Yang Zhang, Jinglai Duan, Jack Ng, C. T. Chan, and Kin Hung Fung

Phys. Rev. Lett. 122, 200201 (2019) - Published 24 May, 2019

Machine Learning Nonlocal Correlations

Askery Canabarro, Samuraí Brito, and Rafael Chaves

Phys. Rev. Lett. 122, 200401 (2019) - Published 22 May, 2019

Coherent Superposition of Feshbach Dimers and Efimov Trimers

Yaakov Yudkin, Roy Elbaz, P. Giannakeas, Chris H. Greene, and Lev Khaykovich

Phys. Rev. Lett. 122, 200402 (2019) - Published 24 May, 2019

Randomization of Pulse Phases for Unambiguous and Robust Quantum Sensing

Zhen-Yu Wang, Jacob E. Lang, Simon Schmitt, Johannes Lang, Jorge Casanova, Liam McGuinness, Tania S. Monteiro, Fedor Jelezko, and Martin B. Plenio

Phys. Rev. Lett. 122, 200403 (2019) - Published 24 May, 2019

Neural Belief-Propagation Decoders for Quantum Error-Correcting Codes

Ye-Hua Liu and David Poulin

Phys. Rev. Lett. 122, 200501 (2019) - Published 22 May, 2019

Three-Qubit Randomized Benchmarking

David C. McKay, Sarah Sheldon, John A. Smolin, Jerry M. Chow, and Jay M. Gambetta

Phys. Rev. Lett. 122, 200502 (2019) - Published 23 May, 2019

Thermodynamic Capacity of Quantum Processes

Philippe Faist, Mario Berta, and Fernando Brandão

Phys. Rev. Lett. 122, 200601 (2019) - Published 24 May, 2019

Gravitation and Astrophysics

Gravitational Waves Induced by Non-Gaussian Scalar Perturbations

Rong-Gen Cai (蔡荣根), Shi Pi (皮石), and Misao Sasaki (佐々木節)

Phys. Rev. Lett. 122, 201101 (2019) - Published 20 May, 2019

Decay of Cosmic String Loops due to Particle Radiation

Daiju Matsunami, Levon Pogosian, Ayush Saurabh, and Tanmay Vachaspati

Phys. Rev. Lett. 122, 201301 (2019) - Published 20 May, 2019

No-Boundary Proposal as a Path Integral with Robin Boundary Conditions

Alice Di Tucci and Jean-Luc Lehners

Phys. Rev. Lett. 122, 201302 (2019) - Published 23 May, 2019

Elementary Particles and Fields

Entanglement of Purification in Many Body Systems and Symmetry Breaking

Arpan Bhattacharyya, Alexander Jahn, Tadashi Takayanagi, and Koji Umemoto

Phys. Rev. Lett. 122, 201601 (2019) - Published 22 May, 2019

Matter Dependence of the Four-Loop Cusp Anomalous Dimension

J. M. Henn, T. Peraro, M. Stahlhofen, and P. Wasser

Phys. Rev. Lett. 122, 201602 (2019) - Published 22 May, 2019

Scattering Amplitudes and the Conservative Hamiltonian for Binary Systems at Third Post-Minkowskian Order

Zvi Bern, Clifford Cheung, Radu Roiban, Chia-Hsien Shen, Mikhail P. Solon, and Mao Zeng

Phys. Rev. Lett. 122, 201603 (2019) - Published 24 May, 2019

Direct Searches for Hidden-Photon Dark Matter with the SHUKET Experiment

Pierre Brun, Laurent Chevalier, and Christophe Flouzat

Phys. Rev. Lett. 122, 201801 (2019) - Published 23 May, 2019

Electroweak Baryogenesis from Dark-Sector $C P$ Violation

Marcela Carena, Mariano Quirós, and Yue Zhang

Phys. Rev. Lett. 122, 201802 (2019) - Published 24 May, 2019

Observation of the Decay $X (3872) \to π^{0} χ_{c 1} (1 P)$

M. Ablikim et al. (BESIII Collaboration)

Phys. Rev. Lett. 122, 202001 (2019) - Published 23 May, 2019

Novel Method for Precisely Measuring the $X (3872)$ Mass

Feng-Kun Guo

Phys. Rev. Lett. 122, 202002 (2019) - Published 24 May, 2019

Atomic, Molecular, and Optical Physics

Conservation of Torus-knot Angular Momentum in High-order Harmonic Generation

Emilio Pisanty, Laura Rego, Julio San Román, Antonio Picón, Kevin M. Dorney, Henry C. Kapteyn, Margaret M. Murnane, Luis Plaja, Maciej Lewenstein, and Carlos Hernández-García

Phys. Rev. Lett. 122, 203201 (2019) - Published 22 May, 2019

EDITORS' SUGGESTION

Direct Laser Cooling to Bose-Einstein Condensation in a Dipole Trap

Alban Urvoy, Zachary Vendeiro, Joshua Ramette, Albert Adiyatullin, and Vladan Vuletić

Phys. Rev. Lett. 122, 203202 (2019) - Published 24 May, 2019

A new scheme for cooling $^{87}$ Rb to Bose-Einstein condensation uses only lasers, unlike the usual method combining laser and evaporation cooling.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Contact and Sum Rules in a Near-Uniform Fermi Gas at Unitarity

C. Carcy, S. Hoinka, M. G. Lingham, P. Dyke, C. C. N. Kuhn, H. Hu, and C. J. Vale

Phys. Rev. Lett. 122, 203401 (2019) - Published 23 May, 2019

Cold-atom experiments probe how likely atoms are to pair up in strongly interacting fermion systems.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Spectral Response and Contact of the Unitary Fermi Gas

Biswaroop Mukherjee, Parth B. Patel, Zhenjie Yan, Richard J. Fletcher, Julian Struck, and Martin W. Zwierlein

Phys. Rev. Lett. 122, 203402 (2019) - Published 23 May, 2019

Cold-atom experiments probe how likely atoms are to pair up in strongly interacting fermion systems.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Defect-Free Assembly of 2D Clusters of More Than 100 Single-Atom Quantum Systems

Daniel Ohl de Mello, Dominik Schäffner, Jan Werkmann, Tilman Preuschoff, Lars Kohfahl, Malte Schlosser, and Gerhard Birkl

Phys. Rev. Lett. 122, 203601 (2019) - Published 20 May, 2019

Researchers trap 111 neutral atoms in a predefined, defect-free motif using a new method that could, in the foreseeable future, control one million such atoms.

Langevin Approach to Quantum Optics with Molecules

Michael Reitz, Christian Sommer, and Claudiu Genes

Phys. Rev. Lett. 122, 203602 (2019) - Published 20 May, 2019

Engineering and Harnessing Giant Atoms in High-Dimensional Baths: A Proposal for Implementation with Cold Atoms

A. González-Tudela, C. Sánchez Muñoz, and J. I. Cirac

Phys. Rev. Lett. 122, 203603 (2019) - Published 21 May, 2019

Nonlocal Pair Correlations in a Higher-Order Bose Gas Soliton

King Lun Ng, Bogdan Opanchuk, Margaret D. Reid, and Peter D. Drummond

Phys. Rev. Lett. 122, 203604 (2019) - Published 20 May, 2019

Theory of Subradiant States of a One-Dimensional Two-Level Atom Chain

Yu-Xiang Zhang and Klaus Mølmer

Phys. Rev. Lett. 122, 203605 (2019) - Published 22 May, 2019

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.

Cooperative Energy Transfer Controls the Spontaneous Emission Rate Beyond Field Enhancement Limits

Mohamed ElKabbash, Ermanno Miele, Ahmad K. Fumani, Michael S. Wolf, Angelo Bozzola, Elisha Haber, Tigran V. Shahbazyan, Jesse Berezovsky, Francesco De Angelis, and Giuseppe Strangi

Phys. Rev. Lett. 122, 203901 (2019) - Published 22 May, 2019

Deterministic Nonlinear Transformations of Phase Noise in Quantum-Limited Frequency Combs

A. Liehl, P. Sulzer, D. Fehrenbacher, T. Rybka, D. V. Seletskiy, and A. Leitenstorfer

Phys. Rev. Lett. 122, 203902 (2019) - Published 24 May, 2019

Observation of Three-Dimensional Photonic Dirac Points and Spin-Polarized Surface Arcs

Qinghua Guo, Oubo You, Biao Yang, James B. Sellman, Edward Blythe, Hongchao Liu, Yuanjiang Xiang, Jensen Li, Dianyuan Fan, Jing Chen, C. T. Chan, and Shuang Zhang

Phys. Rev. Lett. 122, 203903 (2019) - Published 24 May, 2019

Elastic Higher-Order Topological Insulator with Topologically Protected Corner States

Haiyan Fan, Baizhan Xia, Liang Tong, Shengjie Zheng, and Dejie Yu

Phys. Rev. Lett. 122, 204301 (2019) - Published 24 May, 2019

Plasma and Beam Physics

Polarized Light from the Transportation of a Matter-Antimatter Beam in a Plasma

Ujjwal Sinha, Christoph H. Keitel, and Naveen Kumar

Phys. Rev. Lett. 122, 204801 (2019) - Published 21 May, 2019

Optimizing Laser Pulses for Narrow-Band Inverse Compton Sources in the High-Intensity Regime

Daniel Seipt, Vasily Yu. Kharin, and Sergey G. Rykovanov

Phys. Rev. Lett. 122, 204802 (2019) - Published 22 May, 2019

Measurement of the Spin Tune Using the Coherent Spin Motion of Polarized Protons in a Storage Ring

H. Huang, J. Kewisch, C. Liu, A. Marusic, W. Meng, F. Méot, P. Oddo, V. Ptitsyn, V. Ranjbar, T. Roser, and W. B. Schmidke

Phys. Rev. Lett. 122, 204803 (2019) - Published 22 May, 2019

Phase Space Dynamics of a Plasma Wakefield Dechirper for Energy Spread Reduction

Y. P. Wu, J. F. Hua, Z. Zhou, J. Zhang, S. Liu, B. Peng, Y. Fang, Z. Nie, X. N. Ning, C.-H. Pai, Y. C. Du, W. Lu, C. J. Zhang, W. B. Mori, and C. Joshi

Phys. Rev. Lett. 122, 204804 (2019) - Published 24 May, 2019

First-Principles Determination of Electron-Ion Couplings in the Warm Dense Matter Regime

Jacopo Simoni and Jérôme Daligault

Phys. Rev. Lett. 122, 205001 (2019) - Published 24 May, 2019

Condensed Matter: Structure, etc.

Variational Approach for Impurity Dynamics at Finite Temperature

Weizhe Edward Liu, Jesper Levinsen, and Meera M. Parish

Phys. Rev. Lett. 122, 205301 (2019) - Published 20 May, 2019

Condensed Matter: Electronic Properties, etc.

Topological Axion States in the Magnetic Insulator ${MnBi}_{2} {Te}_{4}$ with the Quantized Magnetoelectric Effect

Dongqin Zhang, Minji Shi, Tongshuai Zhu, Dingyu Xing, Haijun Zhang, and Jing Wang

Phys. Rev. Lett. 122, 206401 (2019) - Published 20 May, 2019

EDITORS' SUGGESTION

Standing Waves Induced by Valley-Mismatched Domains in Ferroelectric SnTe Monolayers

Kai Chang, Brandon J. Miller, Hao Yang, Haicheng Lin, Stuart S. P. Parkin, Salvador Barraza-Lopez, Qi-Kun Xue, Xi Chen, and Shuai-Hua Ji

Phys. Rev. Lett. 122, 206402 (2019) - Published 24 May, 2019

Mismatched valleys across electrically neutral domain walls of a 2D ferroelectric material are shown to induce quasiparticle standing waves.

Einstein Relation for a Driven Disordered Quantum Chain in the Subdiffusive Regime

M. Mierzejewski, P. Prelovšek, and J. Bonča

Phys. Rev. Lett. 122, 206601 (2019) - Published 24 May, 2019

Thermal Transport in One-Dimensional Electronic Fluids

R. Samanta, I. V. Protopopov, A. D. Mirlin, and D. B. Gutman

Phys. Rev. Lett. 122, 206801 (2019) - Published 20 May, 2019

EDITORS' SUGGESTION

All-Microwave Control and Dispersive Readout of Gate-Defined Quantum Dot Qubits in Circuit Quantum Electrodynamics

P. Scarlino, D. J. van Woerkom, A. Stockklauser, J. V. Koski, M. C. Collodo, S. Gasparinetti, C. Reichl, W. Wegscheider, T. Ihn, K. Ensslin, and A. Wallraff

Phys. Rev. Lett. 122, 206802 (2019) - Published 22 May, 2019

A superconducting resonator coupled to a semiconductor double quantum dot allows for a detailed study of coherence properties of charge qubits.

Crystalline-Symmetry-Protected Helical Majorana Modes in the Iron Pnictides

Elio J. König and Piers Coleman

Phys. Rev. Lett. 122, 207001 (2019) - Published 24 May, 2019

Giant Magnetic Anisotropy Induced by Ligand $L S$ Coupling in Layered Cr Compounds

Dong-Hwan Kim, Kyoo Kim, Kyung-Tae Ko, JunHo Seo, Jun Sung Kim, Tae-Hwan Jang, Younghak Kim, Jae-Young Kim, Sang-Wook Cheong, and Jae-Hoon Park

Phys. Rev. Lett. 122, 207201 (2019) - Published 24 May, 2019

Ultrafast X-Ray Absorption Spectroscopy of Strongly Correlated Systems: Core Hole Effect

Chen-Yen Lai and Jian-Xin Zhu

Phys. Rev. Lett. 122, 207401 (2019) - Published 22 May, 2019

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Spectroscopy of Quantum Dot Orbitals with In-Plane Magnetic Fields

Leon C. Camenzind, Liuqi Yu, Peter Stano, Jeramy D. Zimmerman, Arthur C. Gossard, Daniel Loss, and Dominik M. Zumbühl

Phys. Rev. Lett. 122, 207701 (2019) - Published 22 May, 2019

A new experimental method provides a way to determine the 3D confining potential of an electron in a quantum dot, allowing improved control over the electron’s spin.

Role of Quasiparticles in an Electric Circuit with Josephson Junctions

Benoît Rossignol, Thomas Kloss, and Xavier Waintal

Phys. Rev. Lett. 122, 207702 (2019) - Published 22 May, 2019

Quantum Interferometry with a $g$ -Factor-Tunable Spin Qubit

K. Ono, S. N. Shevchenko, T. Mori, S. Moriyama, and Franco Nori

Phys. Rev. Lett. 122, 207703 (2019) - Published 24 May, 2019

Polymer, Soft Matter, Biological, Climate, and Interdisciplinary Physics

EDITORS' SUGGESTION

Unexpected Stretching of Entangled Ring Macromolecules

Q. Huang, J. Ahn, D. Parisi, T. Chang, O. Hassager, S. Panyukov, M. Rubinstein, and D. Vlassopoulos

Phys. Rev. Lett. 122, 208001 (2019) - Published 22 May, 2019

Macromolecules without free ends respond to uniaxial stretching in a way that distinguishes them from any other polymer.

Modeling Gel Swelling Equilibrium in the Mean Field: From Explicit to Poisson-Boltzmann Models

Jonas Landsgesell, David Sean, Patrick Kreissl, Kai Szuttor, and Christian Holm

Phys. Rev. Lett. 122, 208002 (2019) - Published 24 May, 2019

FEATURED IN PHYSICS