Volume 123, Issue 25

20 December 2019

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On the Cover

Cubic air bubble formed by immersing a cubic polymer frame with six open faces in water. The width of each window is 1.4 mm. Selected for an Editors' Suggestion.

From the article:

Acoustics of Cubic Bubbles: Six Coupled Oscillators
Maxime Harazi, Matthieu Rupin, Olivier Stephan, Emmanuel Bossy, and Philippe Marmottant
Phys. Rev. Lett. 123, 254501 (2019)

HIGHLIGHTED ARTICLES

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Boson Sampling with 20 Input Photons and a 60-Mode Interferometer in a $1 0^{14}$ -Dimensional Hilbert Space

Hui Wang, Jian Qin, Xing Ding, Ming-Cheng Chen, Si Chen, Xiang You, Yu-Ming He, Xiao Jiang, L. You, Z. Wang, C. Schneider, Jelmer J. Renema, Sven Höfling, Chao-Yang Lu, and Jian-Wei Pan

Phys. Rev. Lett. 123, 250503 (2019) - Published 18 December, 2019

Experiments show that when enough photons travel through a complex optical network, only a quantum computer can efficiently sample the range of possible outcomes.

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EDITORS' SUGGESTION

Light Dark Matter Search with Ionization Signals in XENON1T

E. Aprile et al. (XENON Collaboration)

Phys. Rev. Lett. 123, 251801 (2019) - Published 17 December, 2019

By reanalyzing experimental data from 2017 and 2018, the XENON Collaboration rules out several varieties of low-mass dark matter, including a range of axion-like particles and dark photons.

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EDITORS' SUGGESTION

Direct Measurement of Capillary Attraction between Floating Disks

Ian Ho, Giuseppe Pucci, and Daniel M. Harris

Phys. Rev. Lett. 123, 254502 (2019) - Published 19 December, 2019

By measuring the forces that cause floating objects to drift toward each other, researchers hope to better understand the interactions that cause particles to self-assemble in fluids.

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Threaded Rings that Swim in Excitable Media

Antonio Cincotti, Fabian Maucher, David Evans, Brette M. Chapin, Kate Horner, Elizabeth Bromley, Andrew Lobb, Jonathan W. Steed, and Paul Sutcliffe

Phys. Rev. Lett. 123, 258102 (2019) - Published 20 December, 2019

An unusual configuration of waves in a chemical medium may be useful for understanding heart arrhythmias.

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Finite Speed of Quantum Scrambling with Long Range Interactions

Chi-Fang Chen and Andrew Lucas

Phys. Rev. Lett. 123, 250605 (2019) - Published 20 December, 2019

EDITORS' SUGGESTION

Positivity of Amplitudes, Weak Gravity Conjecture, and Modified Gravity

Brando Bellazzini, Matthew Lewandowski, and Javi Serra

Phys. Rev. Lett. 123, 251103 (2019) - Published 18 December, 2019

The weak gravity conjecture—which posits that gravity must be the weakest force in theories of matter coupled to gravity—is shown to be satisfied as a general property of scattering matrices of effective field theories.

EDITORS' SUGGESTION

Hyperfine Magnetic Substate Resolved State-to-State Chemistry

Joschka Wolf, Markus Deiß, and Johannes Hecker Denschlag

Phys. Rev. Lett. 123, 253401 (2019) - Published 19 December, 2019

Magnetic quantum states of ultracold molecular reactions are spectroscopically resolved for three-body recombination of weakly interacting ultracold rubidium atoms.

EDITORS' SUGGESTION

Acoustics of Cubic Bubbles: Six Coupled Oscillators

Maxime Harazi, Matthieu Rupin, Olivier Stephan, Emmanuel Bossy, and Philippe Marmottant

Phys. Rev. Lett. 123, 254501 (2019) - Published 16 December, 2019

Artificial cubic bubbles are excellent coupled resonators that may be assembled into acoustic metamaterials.

LETTERS

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

Critical Response of a Quantum van der Pol Oscillator

Shovan Dutta and Nigel R. Cooper

Phys. Rev. Lett. 123, 250401 (2019) - Published 20 December, 2019

Quantum Time Crystals and Interacting Gauge Theories in Atomic Bose-Einstein Condensates

Patrik Öhberg and Ewan M. Wright

Phys. Rev. Lett. 123, 250402 (2019) - Published 20 December, 2019

Hardware-Efficient Quantum Random Access Memory with Hybrid Quantum Acoustic Systems

Connor T. Hann, Chang-Ling Zou, Yaxing Zhang, Yiwen Chu, Robert J. Schoelkopf, S. M. Girvin, and Liang Jiang

Phys. Rev. Lett. 123, 250501 (2019) - Published 17 December, 2019

Maximal Quantum Fisher Information for Mixed States

Lukas J. Fiderer, Julien M. E. Fraïsse, and Daniel Braun

Phys. Rev. Lett. 123, 250502 (2019) - Published 18 December, 2019

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Boson Sampling with 20 Input Photons and a 60-Mode Interferometer in a $1 0^{14}$ -Dimensional Hilbert Space

Hui Wang, Jian Qin, Xing Ding, Ming-Cheng Chen, Si Chen, Xiang You, Yu-Ming He, Xiao Jiang, L. You, Z. Wang, C. Schneider, Jelmer J. Renema, Sven Höfling, Chao-Yang Lu, and Jian-Wei Pan

Phys. Rev. Lett. 123, 250503 (2019) - Published 18 December, 2019

Experiments show that when enough photons travel through a complex optical network, only a quantum computer can efficiently sample the range of possible outcomes.

Nuclear Quantum Memory and Time Sequencing of a Single $γ$ Photon

Xiwen Zhang, Wen-Te Liao, Alexey Kalachev, Rustem Shakhmuratov, Marlan Scully, and Olga Kocharovskaya

Phys. Rev. Lett. 123, 250504 (2019) - Published 18 December, 2019

Multiuser Time-Energy Entanglement Swapping Based on Dense Wavelength Division Multiplexed and Sum-Frequency Generation

Yuanhua Li, Yiwen Huang, Tong Xiang, Yiyou Nie, Minghuang Sang, Luqi Yuan, and Xianfeng Chen

Phys. Rev. Lett. 123, 250505 (2019) - Published 20 December, 2019

Macroscopic Thermodynamic Reversibility in Quantum Many-Body Systems

Philippe Faist, Takahiro Sagawa, Kohtaro Kato, Hiroshi Nagaoka, and Fernando G. S. L. Brandão

Phys. Rev. Lett. 123, 250601 (2019) - Published 17 December, 2019

Exact Results for the Boundary Energy of One-Dimensional Bosons

Benjamin Reichert, Grigori E. Astrakharchik, Aleksandra Petković, and Zoran Ristivojevic

Phys. Rev. Lett. 123, 250602 (2019) - Published 17 December, 2019

First Hitting Times to Intermittent Targets

Gabriel Mercado-Vásquez and Denis Boyer

Phys. Rev. Lett. 123, 250603 (2019) - Published 18 December, 2019

Scaling Hypothesis for Matrix Product States

Bram Vanhecke, Jutho Haegeman, Karel Van Acoleyen, Laurens Vanderstraeten, and Frank Verstraete

Phys. Rev. Lett. 123, 250604 (2019) - Published 18 December, 2019

FEATURED IN PHYSICS

Finite Speed of Quantum Scrambling with Long Range Interactions

Chi-Fang Chen and Andrew Lucas

Phys. Rev. Lett. 123, 250605 (2019) - Published 20 December, 2019

Steering Heat Engines: A Truly Quantum Maxwell Demon

Konstantin Beyer, Kimmo Luoma, and Walter T. Strunz

Phys. Rev. Lett. 123, 250606 (2019) - Published 20 December, 2019

Gravitation and Astrophysics

Primordial Black Holes as a Dark Matter Candidate Are Severely Constrained by the Galactic Center 511 keV $γ$ -Ray Line

Ranjan Laha

Phys. Rev. Lett. 123, 251101 (2019) - Published 16 December, 2019

Constraining Primordial Black Hole Abundance with the Galactic 511 keV Line

William DeRocco and Peter W. Graham

Phys. Rev. Lett. 123, 251102 (2019) - Published 16 December, 2019

EDITORS' SUGGESTION

Positivity of Amplitudes, Weak Gravity Conjecture, and Modified Gravity

Brando Bellazzini, Matthew Lewandowski, and Javi Serra

Phys. Rev. Lett. 123, 251103 (2019) - Published 18 December, 2019

Time-Dependent AMS-02 Electron-Positron Fluxes in an Extended Force-Field Model

Marco Kuhlen and Philipp Mertsch

Phys. Rev. Lett. 123, 251104 (2019) - Published 19 December, 2019

Cosmic Expansion History from Line-Intensity Mapping

José Luis Bernal, Patrick C. Breysse, and Ely D. Kovetz

Phys. Rev. Lett. 123, 251301 (2019) - Published 18 December, 2019

Elementary Particles and Fields

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Light Dark Matter Search with Ionization Signals in XENON1T

E. Aprile et al. (XENON Collaboration)

Phys. Rev. Lett. 123, 251801 (2019) - Published 17 December, 2019

By reanalyzing experimental data from 2017 and 2018, the XENON Collaboration rules out several varieties of low-mass dark matter, including a range of axion-like particles and dark photons.

Nuclear Physics

Global Sensitivity Analysis of Bulk Properties of an Atomic Nucleus

Andreas Ekström and Gaute Hagen

Phys. Rev. Lett. 123, 252501 (2019) - Published 20 December, 2019

Atomic, Molecular, and Optical Physics

EDITORS' SUGGESTION

Hyperfine Magnetic Substate Resolved State-to-State Chemistry

Joschka Wolf, Markus Deiß, and Johannes Hecker Denschlag

Phys. Rev. Lett. 123, 253401 (2019) - Published 19 December, 2019

Magnetic quantum states of ultracold molecular reactions are spectroscopically resolved for three-body recombination of weakly interacting ultracold rubidium atoms.

Inelastic Scattering of Photon Pairs in Qubit Arrays with Subradiant States

Yongguan Ke, Alexander V. Poshakinskiy, Chaohong Lee, Yuri S. Kivshar, and Alexander N. Poddubny

Phys. Rev. Lett. 123, 253601 (2019) - Published 19 December, 2019

Triply Magic Conditions for Microwave Transition of Optically Trapped Alkali-Metal Atoms

Gang Li, Yali Tian, Wei Wu, Shaokang Li, Xiangyan Li, Yanxin Liu, Pengfei Zhang, and Tiancai Zhang

Phys. Rev. Lett. 123, 253602 (2019) - Published 20 December, 2019

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.

High- $Q$ Quasibound States in the Continuum for Nonlinear Metasurfaces

Zhuojun Liu, Yi Xu, Ye Lin, Jin Xiang, Tianhua Feng, Qitao Cao, Juntao Li, Sheng Lan, and Jin Liu

Phys. Rev. Lett. 123, 253901 (2019) - Published 17 December, 2019

Polychromatic Cherenkov Radiation Induced Group Velocity Symmetry Breaking in Counterpropagating Dissipative Kerr Solitons

Wenle Weng, Romain Bouchand, Erwan Lucas, and Tobias J. Kippenberg

Phys. Rev. Lett. 123, 253902 (2019) - Published 17 December, 2019

2D Solitons in $P T$ -Symmetric Photonic Lattices

Andre L. M. Muniz, Martin Wimmer, Arstan Bisianov, Ulf Peschel, Roberto Morandotti, Pawel S. Jung, and Demetrios N. Christodoulides

Phys. Rev. Lett. 123, 253903 (2019) - Published 18 December, 2019

Universal Signature from Integrability to Chaos in Dissipative Open Quantum Systems

Gernot Akemann, Mario Kieburg, Adam Mielke, and Tomaž Prosen

Phys. Rev. Lett. 123, 254101 (2019) - Published 18 December, 2019

Rapid Flipping of Parametric Phase States

Martin Frimmer, Toni L. Heugel, Žiga Nosan, Felix Tebbenjohanns, David Hälg, Abdulkadir Akin, Christian L. Degen, Lukas Novotny, R. Chitra, Oded Zilberberg, and Alexander Eichler

Phys. Rev. Lett. 123, 254102 (2019) - Published 19 December, 2019

Coupling of Edge States and Topological Bragg Solitons

Weifeng Zhang, Xianfeng Chen, Yaroslav V. Kartashov, Vladimir V. Konotop, and Fangwei Ye

Phys. Rev. Lett. 123, 254103 (2019) - Published 19 December, 2019

EDITORS' SUGGESTION

Acoustics of Cubic Bubbles: Six Coupled Oscillators

Maxime Harazi, Matthieu Rupin, Olivier Stephan, Emmanuel Bossy, and Philippe Marmottant

Phys. Rev. Lett. 123, 254501 (2019) - Published 16 December, 2019

Artificial cubic bubbles are excellent coupled resonators that may be assembled into acoustic metamaterials.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Direct Measurement of Capillary Attraction between Floating Disks

Ian Ho, Giuseppe Pucci, and Daniel M. Harris

Phys. Rev. Lett. 123, 254502 (2019) - Published 19 December, 2019

By measuring the forces that cause floating objects to drift toward each other, researchers hope to better understand the interactions that cause particles to self-assemble in fluids.

Plasma and Beam Physics

Single-Shot Multi-keV X-Ray Absorption Spectroscopy Using an Ultrashort Laser-Wakefield Accelerator Source

B. Kettle, E. Gerstmayr, M. J. V. Streeter, F. Albert, R. A. Baggott, N. Bourgeois, J. M. Cole, S. Dann, K. Falk, I. Gallardo González, A. E. Hussein, N. Lemos, N. C. Lopes, O. Lundh, Y. Ma, S. J. Rose, C. Spindloe, D. R. Symes, M. Šmíd, A. G. R. Thomas, R. Watt, and S. P. D. Mangles

Phys. Rev. Lett. 123, 254801 (2019) - Published 17 December, 2019

Observations of Electromagnetic Electron Holes and Evidence of Cherenkov Whistler Emission

Konrad Steinvall, Yuri V. Khotyaintsev, Daniel B. Graham, Andris Vaivads, Olivier Le Contel, and Christopher T. Russell

Phys. Rev. Lett. 123, 255101 (2019) - Published 18 December, 2019

Condensed Matter: Structure, etc.

Capture Deformation Twinning in Mg during Shock Compression with Ultrafast Synchrotron X-Ray Diffraction

S. Chen, Y. X. Li, N. B. Zhang, J. W. Huang, H. M. Hou, S. J. Ye, T. Zhong, X. L. Zeng, D. Fan, L. Lu, L. Wang, T. Sun, K. Fezzaa, Y. Y. Zhang, M. X. Tang, and S. N. Luo

Phys. Rev. Lett. 123, 255501 (2019) - Published 18 December, 2019

Reassessment of the Dynamic Thermomechanical Conversion in Metals

J. C. Nieto-Fuentes, S. Osovski, A. Venkert, and D. Rittel

Phys. Rev. Lett. 123, 255502 (2019) - Published 20 December, 2019

Berry Phase of Phonons and Thermal Hall Effect in Nonmagnetic Insulators

Takuma Saito, Kou Misaki, Hiroaki Ishizuka, and Naoto Nagaosa

Phys. Rev. Lett. 123, 255901 (2019) - Published 18 December, 2019

In situ Measurement of Thermodiffusion in Liquid Alloys

E. Sondermann, F. Kargl, and A. Meyer

Phys. Rev. Lett. 123, 255902 (2019) - Published 20 December, 2019

Polarization Selectivity in Vibrational Electron-Energy-Loss Spectroscopy

G. Radtke, D. Taverna, N. Menguy, S. Pandolfi, A. Courac, Y. Le Godec, O. L. Krivanek, and T. C. Lovejoy

Phys. Rev. Lett. 123, 256001 (2019) - Published 19 December, 2019

Contact-Induced Phase Separation of Alloy Catalyst to Promote Carbon Nanotube Growth

Lu Qiu and Feng Ding

Phys. Rev. Lett. 123, 256101 (2019) - Published 18 December, 2019

Condensed Matter: Electronic Properties, etc.

Effect of Nonlocal Correlations on the Electronic Structure of LiFeAs

Karim Zantout, Steffen Backes, and Roser Valentí

Phys. Rev. Lett. 123, 256401 (2019) - Published 16 December, 2019

Two-Dimensional Second-Order Topological Insulator in Graphdiyne

Xian-Lei Sheng, Cong Chen, Huiying Liu, Ziyu Chen, Zhi-Ming Yu, Y. X. Zhao, and Shengyuan A. Yang

Phys. Rev. Lett. 123, 256402 (2019) - Published 18 December, 2019

Diamagnetic Response of Potassium-Adsorbed Multilayer FeSe Film

Gang Yao, Ming-Chao Duan, Ningning Liu, Yanfu Wu, Dan-Dan Guan, Shiyong Wang, Hao Zheng, Yao-Yi Li, Canhua Liu, and Jin-Feng Jia

Phys. Rev. Lett. 123, 257001 (2019) - Published 20 December, 2019

Spin Transport in a Magnetic Insulator with Zero Effective Damping

T. Wimmer, M. Althammer, L. Liensberger, N. Vlietstra, S. Geprägs, M. Weiler, R. Gross, and H. Huebl

Phys. Rev. Lett. 123, 257201 (2019) - Published 17 December, 2019

Experimental Realization of Atomic-Scale Magnonic Crystals

H. J. Qin, S. Tsurkan, A. Ernst, and Kh. Zakeri

Phys. Rev. Lett. 123, 257202 (2019) - Published 18 December, 2019

$T$ Operator Bounds on Angle-Integrated Absorption and Thermal Radiation for Arbitrary Objects

Sean Molesky, Weiliang Jin, Prashanth S. Venkataram, and Alejandro W. Rodriguez

Phys. Rev. Lett. 123, 257401 (2019) - Published 20 December, 2019

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

Understanding Dense Active Nematics from Microscopic Models

Aurelio Patelli, Ilyas Djafer-Cherif, Igor S. Aranson, Eric Bertin, and Hugues Chaté

Phys. Rev. Lett. 123, 258001 (2019) - Published 18 December, 2019

Influence of Hydrodynamic Interactions on Colloidal Crystallization

Michio Tateno, Taiki Yanagishima, John Russo, and Hajime Tanaka

Phys. Rev. Lett. 123, 258002 (2019) - Published 20 December, 2019

Flow-Induced Symmetry Breaking in Growing Bacterial Biofilms

Philip Pearce, Boya Song, Dominic J. Skinner, Rachel Mok, Raimo Hartmann, Praveen K. Singh, Hannah Jeckel, Jeffrey S. Oishi, Knut Drescher, and Jörn Dunkel

Phys. Rev. Lett. 123, 258101 (2019) - Published 20 December, 2019

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EDITORS' SUGGESTION