Volume 122, Issue 8

1 March 2019

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On the Cover

Plasma channel used to guide femtosecond petawatt wakefield laser pulses. Red/orange/yellow: heater-laser pulse; blue: electron density profile; gray: sapphire tube. Selected for a Viewpoint in Physics and an Editors’ Suggestion.

From the article:

Petawatt Laser Guiding and Electron Beam Acceleration to 8 GeV in a Laser-Heated Capillary Discharge Waveguide
A. J. Gonsalves, K. Nakamura, J. Daniels, C. Benedetti, C. Pieronek, T. C. H. de Raadt, S. Steinke, J. H. Bin, S. S. Bulanov, J. van Tilborg, C. G. R. Geddes, C. B. Schroeder, Cs. Tóth, E. Esarey, K. Swanson, L. Fan-Chiang, G. Bagdasarov, N. Bobrova, V. Gasilov, G. Korn, P. Sasorov, and W. P. Leemans
Phys. Rev. Lett. 122, 084801 (2019)

HIGHLIGHTED ARTICLES

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Density Oscillations Induced by Individual Ultracold Two-Body Collisions

Q. Guan, V. Klinkhamer, R. Klemt, J. H. Becher, A. Bergschneider, P. M. Preiss, S. Jochim, and D. Blume

Phys. Rev. Lett. 122, 083401 (2019) - Published 27 February, 2019

A new experimental setup allows researchers to observe collisions between two ultracold atoms while tuning how hard they hit.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Gravitational Mass Carried by Sound Waves

Angelo Esposito, Rafael Krichevsky, and Alberto Nicolis

Phys. Rev. Lett. 122, 084501 (2019) - Published 1 March, 2019

Even if you ignore general relativity, sound waves transport a small amount of mass, according to theory.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Petawatt Laser Guiding and Electron Beam Acceleration to 8 GeV in a Laser-Heated Capillary Discharge Waveguide

A. J. Gonsalves, K. Nakamura, J. Daniels, C. Benedetti, C. Pieronek, T. C. H. de Raadt, S. Steinke, J. H. Bin, S. S. Bulanov, J. van Tilborg, C. G. R. Geddes, C. B. Schroeder, Cs. Tóth, E. Esarey, K. Swanson, L. Fan-Chiang, G. Bagdasarov, N. Bobrova, V. Gasilov, G. Korn, P. Sasorov, and W. P. Leemans

Phys. Rev. Lett. 122, 084801 (2019) - Published 25 February, 2019

A method for accelerating particles, called wakefield acceleration, has notched up its output energy, bringing it closer to its goal of shrinking the size of accelerator facilities.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Evidence for a Spatially Modulated Superfluid Phase of ${}^{3}{He}$ under Confinement

Lev V. Levitin, Ben Yager, Laura Sumner, Brian Cowan, Andrew J. Casey, John Saunders, Nikolay Zhelev, Robert G. Bennett, and Jeevak M. Parpia

Phys. Rev. Lett. 122, 085301 (2019) - Published 27 February, 2019

A surprising two-dimensional pattern appears in superfluid helium-3 when the liquid is confined to a micrometer-thick cell and exposed to a magnetic field.

FEATURED IN PHYSICS

Picometer-Stable Hexagonal Optical Bench to Verify LISA Phase Extraction Linearity and Precision

Thomas S. Schwarze, Germán Fernández Barranco, Daniel Penkert, Marina Kaufer, Oliver Gerberding, and Gerhard Heinzel

Phys. Rev. Lett. 122, 081104 (2019) - Published 28 February, 2019

Researchers propose a device to verify the performance of the laser-based equipment that will fly on the Laser Interferometer Space Antenna.

EDITORS' SUGGESTION

Solving Statistical Mechanics Using Variational Autoregressive Networks

Dian Wu, Lei Wang, and Pan Zhang

Phys. Rev. Lett. 122, 080602 (2019) - Published 28 February, 2019

Deep neural networks can effectively sample from the Boltzmann distribution and compute the variational free energy as well as physical observables better than existing mean-field methods.

EDITORS' SUGGESTION

Can We Probe Planckian Corrections at the Horizon Scale with Gravitational Waves?

Andrea Addazi, Antonino Marcianò, and Nicolás Yunes

Phys. Rev. Lett. 122, 081301 (2019) - Published 25 February, 2019

A theoretical study quantifies future challenges for probing the horizon structure of merging black holes using gravitational waves as a tool to study quantum gravity.

EDITORS' SUGGESTION

Severe Constraints on New Physics Explanations of the MiniBooNE Excess

Johnathon R. Jordan, Yonatan Kahn, Gordan Krnjaic, Matthew Moschella, and Joshua Spitz

Phys. Rev. Lett. 122, 081801 (2019) - Published 26 February, 2019

Explanations of the MiniBooNE excess involving new particles are severely constrained by existing data.

EDITORS' SUGGESTION

Universal Hall Response in Interacting Quantum Systems

Sebastian Greschner, Michele Filippone, and Thierry Giamarchi

Phys. Rev. Lett. 122, 083402 (2019) - Published 28 February, 2019

An extended regime of quantum phases is identified in which the Hall response becomes independent of the interaction strength and particle statistics, a result which remains true for both interacting bosons and fermions.

EDITORS' SUGGESTION

Shaping Electron Wave Functions in a Carbon Nanotube with a Parallel Magnetic Field

M. Margańska, D. R. Schmid, A. Dirnaichner, P. L. Stiller, Ch. Strunk, M. Grifoni, and A. K. Hüttel

Phys. Rev. Lett. 122, 086802 (2019) - Published 26 February, 2019

Lattice structure, topology, and confinement combine in carbon nanotube quantum dots to allow a magnetic field to shape the electronic wave function.

LETTERS

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

Experimental Test of Contextuality in Quantum and Classical Systems

Aonan Zhang, Huichao Xu, Jie Xie, Han Zhang, Brian J. Smith, M. S. Kim, and Lijian Zhang

Phys. Rev. Lett. 122, 080401 (2019) - Published 26 February, 2019

Measuring Nonclassicality of Bosonic Field Quantum States via Operator Ordering Sensitivity

Stephan De Bièvre, Dmitri B. Horoshko, Giuseppe Patera, and Mikhail I. Kolobov

Phys. Rev. Lett. 122, 080402 (2019) - Published 27 February, 2019

Experimental Realization of Nonadiabatic Shortcut to Non-Abelian Geometric Gates

Tongxing Yan, Bao-Jie Liu, Kai Xu, Chao Song, Song Liu, Zhensheng Zhang, Hui Deng, Zhiguang Yan, Hao Rong, Keqiang Huang, Man-Hong Yung, Yuanzhen Chen, and Dapeng Yu

Phys. Rev. Lett. 122, 080501 (2019) - Published 25 February, 2019

Gated Conditional Displacement Readout of Superconducting Qubits

S. Touzard, A. Kou, N. E. Frattini, V. V. Sivak, S. Puri, A. Grimm, L. Frunzio, S. Shankar, and M. H. Devoret

Phys. Rev. Lett. 122, 080502 (2019) - Published 25 February, 2019

Qubit Measurement by Multichannel Driving

Joni Ikonen, Jan Goetz, Jesper Ilves, Aarne Keränen, Andras M. Gunyho, Matti Partanen, Kuan Y. Tan, Dibyendu Hazra, Leif Grönberg, Visa Vesterinen, Slawomir Simbierowicz, Juha Hassel, and Mikko Möttönen

Phys. Rev. Lett. 122, 080503 (2019) - Published 25 February, 2019

Fault-Tolerant Logical Gates in the IBM Quantum Experience

Robin Harper and Steven T. Flammia

Phys. Rev. Lett. 122, 080504 (2019) - Published 26 February, 2019

Resource Quantification for the No-Programing Theorem

Aleksander M. Kubicki, Carlos Palazuelos, and David Pérez-García

Phys. Rev. Lett. 122, 080505 (2019) - Published 28 February, 2019

Emergent SO(5) Symmetry at the Columnar Ordering Transition in the Classical Cubic Dimer Model

G. J. Sreejith, Stephen Powell, and Adam Nahum

Phys. Rev. Lett. 122, 080601 (2019) - Published 27 February, 2019

EDITORS' SUGGESTION

Solving Statistical Mechanics Using Variational Autoregressive Networks

Dian Wu, Lei Wang, and Pan Zhang

Phys. Rev. Lett. 122, 080602 (2019) - Published 28 February, 2019

Deep neural networks can effectively sample from the Boltzmann distribution and compute the variational free energy as well as physical observables better than existing mean-field methods.

Typicality of Prethermalization

Peter Reimann and Lennart Dabelow

Phys. Rev. Lett. 122, 080603 (2019) - Published 1 March, 2019

Universal Dynamics of Inhomogeneous Quantum Phase Transitions: Suppressing Defect Formation

F. J. Gómez-Ruiz and A. del Campo

Phys. Rev. Lett. 122, 080604 (2019) - Published 1 March, 2019

Gravitation and Astrophysics

Blasts of Light from Axions

Taishi Ikeda, Richard Brito, and Vitor Cardoso

Phys. Rev. Lett. 122, 081101 (2019) - Published 28 February, 2019

Gravitational-Wave Background Sky Maps from Advanced LIGO O1 Data

Arianna I. Renzini and Carlo R. Contaldi

Phys. Rev. Lett. 122, 081102 (2019) - Published 1 March, 2019

Probing the Fermi-LAT GeV Excess with Gravitational Waves

Francesca Calore, Tania Regimbau, and Pasquale Dario Serpico

Phys. Rev. Lett. 122, 081103 (2019) - Published 1 March, 2019

FEATURED IN PHYSICS

Picometer-Stable Hexagonal Optical Bench to Verify LISA Phase Extraction Linearity and Precision

Thomas S. Schwarze, Germán Fernández Barranco, Daniel Penkert, Marina Kaufer, Oliver Gerberding, and Gerhard Heinzel

Phys. Rev. Lett. 122, 081104 (2019) - Published 28 February, 2019

Researchers propose a device to verify the performance of the laser-based equipment that will fly on the Laser Interferometer Space Antenna.

EDITORS' SUGGESTION

Can We Probe Planckian Corrections at the Horizon Scale with Gravitational Waves?

Andrea Addazi, Antonino Marcianò, and Nicolás Yunes

Phys. Rev. Lett. 122, 081301 (2019) - Published 25 February, 2019

A theoretical study quantifies future challenges for probing the horizon structure of merging black holes using gravitational waves as a tool to study quantum gravity.

Eternal Inflation and the Refined Swampland Conjecture

William H. Kinney

Phys. Rev. Lett. 122, 081302 (2019) - Published 27 February, 2019

Elementary Particles and Fields

Complexity as a Novel Probe of Quantum Quenches: Universal Scalings and Purifications

Hugo A. Camargo, Pawel Caputa, Diptarka Das, Michal P. Heller, and Ro Jefferson

Phys. Rev. Lett. 122, 081601 (2019) - Published 27 February, 2019

EDITORS' SUGGESTION

Severe Constraints on New Physics Explanations of the MiniBooNE Excess

Johnathon R. Jordan, Yonatan Kahn, Gordan Krnjaic, Matthew Moschella, and Joshua Spitz

Phys. Rev. Lett. 122, 081801 (2019) - Published 26 February, 2019

Explanations of the MiniBooNE excess involving new particles are severely constrained by existing data.

Observation of the Decay $D^{0} \to K^{-} π^{+} e^{+} e^{-}$

J. P. Lees et al. (BaBar Collaboration)

Phys. Rev. Lett. 122, 081802 (2019) - Published 27 February, 2019

Neutrino Masses from Planck-Scale Lepton Number Breaking

Alejandro Ibarra, Patrick Strobl, and Takashi Toma

Phys. Rev. Lett. 122, 081803 (2019) - Published 27 February, 2019

Search for Narrow $H γ$ Resonances in Proton-Proton Collisions at $\sqrt{s} = 13 TeV$

A. M. Sirunyan et al. (CMS Collaboration)

Phys. Rev. Lett. 122, 081804 (2019) - Published 1 March, 2019

First Measurements of Absolute Branching Fractions of the $Ξ_{c}^{0}$ Baryon at Belle

Y. B. Li et al. (Belle Collaboration)

Phys. Rev. Lett. 122, 082001 (2019) - Published 25 February, 2019

Analytic Form of Planar Two-Loop Five-Gluon Scattering Amplitudes in QCD

S. Abreu, J. Dormans, F. Febres Cordero, H. Ita, and B. Page

Phys. Rev. Lett. 122, 082002 (2019) - Published 26 February, 2019

First Measurement of a Long-Lived $π^{+} π^{-}$ Atom Lifetime

B. Adeva et al.

Phys. Rev. Lett. 122, 082003 (2019) - Published 1 March, 2019

Nuclear Physics

Intrinsic Transverse Motion of the Pion’s Valence Quarks

Chao Shi and Ian C. Cloët

Phys. Rev. Lett. 122, 082301 (2019) - Published 1 March, 2019

Atomic, Molecular, and Optical Physics

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Density Oscillations Induced by Individual Ultracold Two-Body Collisions

Q. Guan, V. Klinkhamer, R. Klemt, J. H. Becher, A. Bergschneider, P. M. Preiss, S. Jochim, and D. Blume

Phys. Rev. Lett. 122, 083401 (2019) - Published 27 February, 2019

A new experimental setup allows researchers to observe collisions between two ultracold atoms while tuning how hard they hit.

EDITORS' SUGGESTION

Universal Hall Response in Interacting Quantum Systems

Sebastian Greschner, Michele Filippone, and Thierry Giamarchi

Phys. Rev. Lett. 122, 083402 (2019) - Published 28 February, 2019

Photodissociation by Circularly Polarized Light Yields Photofragment Alignment in Ozone Arising Solely from Vibronic Interactions

Chaya Weeraratna, Oleg S. Vasyutinskii, and Arthur G. Suits

Phys. Rev. Lett. 122, 083403 (2019) - Published 1 March, 2019

Beam Focusing and Reduction of Quantum Uncertainty in Width at the Few-Photon Level via Multi-Spatial-Mode Squeezing

Lida Zhang (张理达), G. S. Agarwal, and M. O. Scully

Phys. Rev. Lett. 122, 083601 (2019) - Published 28 February, 2019

Polarization Oscillations in Birefringent Emitter-Cavity Systems

Thomas D. Barrett, Oliver Barter, Dustin Stuart, Ben Yuen, and Axel Kuhn

Phys. Rev. Lett. 122, 083602 (2019) - Published 1 March, 2019

Shot-Noise-Limited Nanomechanical Detection and Radiation Pressure Backaction from an Electron Beam

S. Pairis, F. Donatini, M. Hocevar, D. Tumanov, N. Vaish, J. Claudon, J.-P. Poizat, and P. Verlot

Phys. Rev. Lett. 122, 083603 (2019) - Published 1 March, 2019

Nonlinear Dynamics, Fluid Dynamics, Classical Optics, etc.

Demonstration of Enhanced Optical Pressure on a Structured Surface

Li-Fan Yang, Anurup Datta, Yu-Chun Hsueh, Xianfan Xu, and Kevin J. Webb

Phys. Rev. Lett. 122, 083901 (2019) - Published 26 February, 2019

Two-Dimensional Topological Polariton Laser

Yaroslav V. Kartashov and Dmitry V. Skryabin

Phys. Rev. Lett. 122, 083902 (2019) - Published 26 February, 2019

Photonic Gauge Potential in One Cavity with Synthetic Frequency and Orbital Angular Momentum Dimensions

Luqi Yuan, Qian Lin, Anwei Zhang, Meng Xiao, Xianfeng Chen, and Shanhui Fan

Phys. Rev. Lett. 122, 083903 (2019) - Published 1 March, 2019

Breather Wave Molecules

Gang Xu, Andrey Gelash, Amin Chabchoub, Vladimir Zakharov, and Bertrand Kibler

Phys. Rev. Lett. 122, 084101 (2019) - Published 27 February, 2019

Dynamical Freezing of Relaxation to Equilibrium

Stefano Iubini, Liviu Chirondojan, Gian-Luca Oppo, Antonio Politi, and Paolo Politi

Phys. Rev. Lett. 122, 084102 (2019) - Published 1 March, 2019

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Gravitational Mass Carried by Sound Waves

Angelo Esposito, Rafael Krichevsky, and Alberto Nicolis

Phys. Rev. Lett. 122, 084501 (2019) - Published 1 March, 2019

Even if you ignore general relativity, sound waves transport a small amount of mass, according to theory.

Plasma and Beam Physics

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Petawatt Laser Guiding and Electron Beam Acceleration to 8 GeV in a Laser-Heated Capillary Discharge Waveguide

Phys. Rev. Lett. 122, 084801 (2019) - Published 25 February, 2019

A method for accelerating particles, called wakefield acceleration, has notched up its output energy, bringing it closer to its goal of shrinking the size of accelerator facilities.

Breakdown of Fermi Degeneracy in the Simplest Liquid Metal

M. Zaghoo, T. R. Boehly, J. R. Rygg, P. M. Celliers, S. X. Hu, and G. W. Collins

Phys. Rev. Lett. 122, 085001 (2019) - Published 27 February, 2019

Condensed Matter: Structure, etc.

FEATURED IN PHYSICS

EDITORS' SUGGESTION

Evidence for a Spatially Modulated Superfluid Phase of ${}^{3}{He}$ under Confinement

Lev V. Levitin, Ben Yager, Laura Sumner, Brian Cowan, Andrew J. Casey, John Saunders, Nikolay Zhelev, Robert G. Bennett, and Jeevak M. Parpia

Phys. Rev. Lett. 122, 085301 (2019) - Published 27 February, 2019

A surprising two-dimensional pattern appears in superfluid helium-3 when the liquid is confined to a micrometer-thick cell and exposed to a magnetic field.