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  Subjects -> PHYSICS (Total: 795 journals)
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PHYSICS (573 journals)

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Journal Cover Physical Review X
  [SJR: 5.04]   [H-I: 38]   [10 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Online) 2160-3308
   Published by APS Homepage  [11 journals]
  • Integrable Families of Hard-Core Particles with Unequal Masses in a
           One-Dimensional Harmonic Trap

    • Authors: N. L. Harshman; Maxim Olshanii, A. S. Dehkharghani, A. G. Volosniev, Steven Glenn Jackson, N. T. Zinner
      First page: 041001
      Abstract: Author(s): N. L. Harshman, Maxim Olshanii, A. S. Dehkharghani, A. G. Volosniev, Steven Glenn Jackson, and N. T. Zinner
      A new solvable model of interacting quantum particles exhibits a broader range of dynamical behavior than previous models, which could provide experimentalists with better insight into mixed-mass ensembles of particles.
      [Phys. Rev. X 7, 041001] Published Wed Oct 04, 2017
      Citation: Phys. Rev. X 7, 041001 (2017)
      PubDate: 2017-10-04T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041001
      Issue No: Vol. 7, No. 4 (2017)
       
  • Globally Stable Microresonator Turing Pattern Formation for Coherent
           High-Power THz Radiation On-Chip

    • Authors: Shu-Wei Huang; Jinghui Yang, Shang-Hua Yang, Mingbin Yu, Dim-Lee Kwong, T. Zelevinsky, Mona Jarrahi, Chee Wei Wong
      First page: 041002
      Abstract: Author(s): Shu-Wei Huang, Jinghui Yang, Shang-Hua Yang, Mingbin Yu, Dim-Lee Kwong, T. Zelevinsky, Mona Jarrahi, and Chee Wei Wong
      Next-generation wireless communication networks will require powerful, stable sources of electromagnetic radiation operating at terahertz frequencies. A new study demonstrates the feasibility of such a source by combing a microscale cavity with a photomixer.
      [Phys. Rev. X 7, 041002] Published Thu Oct 05, 2017
      Citation: Phys. Rev. X 7, 041002 (2017)
      PubDate: 2017-10-05T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041002
      Issue No: Vol. 7, No. 4 (2017)
       
  • Ultrabright GeV Photon Source via Controlled Electromagnetic Cascades in
           Laser-Dipole Waves

    • Authors: A. Gonoskov; A. Bashinov, S. Bastrakov, E. Efimenko, A. Ilderton, A. Kim, M. Marklund, I. Meyerov, A. Muraviev, A. Sergeev
      First page: 041003
      Abstract: Author(s): A. Gonoskov, A. Bashinov, S. Bastrakov, E. Efimenko, A. Ilderton, A. Kim, M. Marklund, I. Meyerov, A. Muraviev, and A. Sergeev
      Laser-matter collisions can generate flashes of energetic particles, but attempts to create high-energy photon sources from such interactions quickly run into limitations on energy. New results show how to exploit fundamental physical processes, such as the creation of antimatter from light, to overcome these limits and create an efficient, ultrabright source of giga-electron-volt photons, with capabilities far surpassing those of other sources.
      [Phys. Rev. X 7, 041003] Published Fri Oct 06, 2017
      Citation: Phys. Rev. X 7, 041003 (2017)
      PubDate: 2017-10-06T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041003
      Issue No: Vol. 7, No. 4 (2017)
       
  • Ground-State Thermodynamic Quantities of Homogeneous Spin-$1/2$ Fermions
           from the BCS Region to the Unitarity Limit

    • Authors: Munekazu Horikoshi; Masato Koashi, Hiroyuki Tajima, Yoji Ohashi, Makoto Kuwata-Gonokami
      First page: 041004
      Abstract: Author(s): Munekazu Horikoshi, Masato Koashi, Hiroyuki Tajima, Yoji Ohashi, and Makoto Kuwata-Gonokami
      Understanding the physical properties of Fermi superfluids is a key step toward the development of high-temperature superconductors as well as insight into the inner workings of neutron stars. New experiments reveal the first comprehensive measurements of thermodynamic properties of fermions in a superfluid with enough accuracy to compare models for how these particles interact.
      [Phys. Rev. X 7, 041004] Published Wed Oct 11, 2017
      Citation: Phys. Rev. X 7, 041004 (2017)
      PubDate: 2017-10-11T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041004
      Issue No: Vol. 7, No. 4 (2017)
       
  • How Confinement-Induced Structures Alter the Contribution of Hydrodynamic
           and Short-Ranged Repulsion Forces to the Viscosity of Colloidal
           Suspensions

    • Authors: Meera Ramaswamy; Neil Y. C. Lin, Brian D. Leahy, Christopher Ness, Andrew M. Fiore, James W. Swan, Itai Cohen
      First page: 041005
      Abstract: Author(s): Meera Ramaswamy, Neil Y. C. Lin, Brian D. Leahy, Christopher Ness, Andrew M. Fiore, James W. Swan, and Itai Cohen
      Understanding the flow of complex fluids through confined spaces, and forces governing the flow, is key to diverse fields, from blood flow to lubricant design. But studying such situations is difficult because typical devices can’t achieve the necessary degree of confinement. New experiments and simulations reveal flow behavior under different levels of confinement and show how this behavior can be tuned.
      [Phys. Rev. X 7, 041005] Published Thu Oct 12, 2017
      Citation: Phys. Rev. X 7, 041005 (2017)
      PubDate: 2017-10-12T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041005
      Issue No: Vol. 7, No. 4 (2017)
       
  • Tuning across Universalities with a Driven Open Condensate

    • Authors: A. Zamora; L. M. Sieberer, K. Dunnett, S. Diehl, M. H. Szymańska
      First page: 041006
      Abstract: Author(s): A. Zamora, L. M. Sieberer, K. Dunnett, S. Diehl, and M. H. Szymańska
      Different complex systems can exhibit remarkably similar behavior, a concept known as universality. Defining different classes of universality for driven nonequilibrium systems, however, is difficult. A new analysis shows how one of these classes—the Kardar-Parisi-Zhang class—can be experimentally realized using a fluid of exciton-polaritons and how the universal behavior can be changed by making this system strongly anisotropic.
      [Phys. Rev. X 7, 041006] Published Fri Oct 13, 2017
      Citation: Phys. Rev. X 7, 041006 (2017)
      PubDate: 2017-10-13T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041006
      Issue No: Vol. 7, No. 4 (2017)
       
  • Light Microscopy at Maximal Precision

    • Authors: Matthew Bierbaum; Brian D. Leahy, Alexander A. Alemi, Itai Cohen, James P. Sethna
      First page: 041007
      Abstract: Author(s): Matthew Bierbaum, Brian D. Leahy, Alexander A. Alemi, Itai Cohen, and James P. Sethna
      A theoretical model of light spreading and scattering improves accuracy precision of position and size measurements made with an optical microscope by as much as 100 times.
      [Phys. Rev. X 7, 041007] Published Fri Oct 13, 2017
      Citation: Phys. Rev. X 7, 041007 (2017)
      PubDate: 2017-10-13T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041007
      Issue No: Vol. 7, No. 4 (2017)
       
  • Topological Frequency Conversion in Strongly Driven Quantum Systems

    • Authors: Ivar Martin; Gil Refael, Bertrand Halperin
      First page: 041008
      Abstract: Author(s): Ivar Martin, Gil Refael, and Bertrand Halperin
      Spatial dimensionality of a system determines the types of phenomena it can exhibit. A new analysis shows how the dimensionality of a single spin-1/2 particle can be effectively increased by applying a drive with two incommensurate frequencies, thereby dynamically inducing an exotic topological phase of matter.
      [Phys. Rev. X 7, 041008] Published Mon Oct 16, 2017
      Citation: Phys. Rev. X 7, 041008 (2017)
      PubDate: 2017-10-16T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041008
      Issue No: Vol. 7, No. 4 (2017)
       
  • Adaptive Quantum Metrology under General Markovian Noise

    • Authors: Rafał Demkowicz-Dobrzański; Jan Czajkowski, Pavel Sekatski
      First page: 041009
      Abstract: Author(s): Rafał Demkowicz-Dobrzański, Jan Czajkowski, and Pavel Sekatski
      Quantum metrology is a technique for using principles of quantum theory to make ultraprecise measurements of physical systems, however, its effectiveness is frequently hampered by environmental noise. A new theoretical analysis provides criteria for knowing whether noise will impact a measurement and if corrections are possible.
      [Phys. Rev. X 7, 041009] Published Mon Oct 16, 2017
      Citation: Phys. Rev. X 7, 041009 (2017)
      PubDate: 2017-10-16T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041009
      Issue No: Vol. 7, No. 4 (2017)
       
  • Free-Space Quantum Electrodynamics with a Single Rydberg Superatom

    • Authors: Asaf Paris-Mandoki; Christoph Braun, Jan Kumlin, Christoph Tresp, Ivan Mirgorodskiy, Florian Christaller, Hans Peter Büchler, Sebastian Hofferberth
      First page: 041010
      Abstract: Author(s): Asaf Paris-Mandoki, Christoph Braun, Jan Kumlin, Christoph Tresp, Ivan Mirgorodskiy, Florian Christaller, Hans Peter Büchler, and Sebastian Hofferberth
      Engineering a strong interaction between a single photon and emitter could lead to novel quantum optical devices but generally requires confining the light inside a cavity. New experiments get around this requirement by coupling a few photons to a single superatom—thousands of atoms behaving as a single entity.
      [Phys. Rev. X 7, 041010] Published Tue Oct 17, 2017
      Citation: Phys. Rev. X 7, 041010 (2017)
      PubDate: 2017-10-17T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041010
      Issue No: Vol. 7, No. 4 (2017)
       
  • Magnetic Resonance with Squeezed Microwaves

    • Authors: A. Bienfait; P. Campagne-Ibarcq, A. H. Kiilerich, X. Zhou, S. Probst, J. J. Pla, T. Schenkel, D. Vion, D. Esteve, J. J. L. Morton, K. Moelmer, P. Bertet
      First page: 041011
      Abstract: Author(s): A. Bienfait, P. Campagne-Ibarcq, A. H. Kiilerich, X. Zhou, S. Probst, J. J. Pla, T. Schenkel, D. Vion, D. Esteve, J. J. L. Morton, K. Moelmer, and P. Bertet
      Electron-spin-resonance measurements can achieve greater sensitivity using squeezed light as an input.
      [Phys. Rev. X 7, 041011] Published Tue Oct 17, 2017
      Citation: Phys. Rev. X 7, 041011 (2017)
      PubDate: 2017-10-17T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041011
      Issue No: Vol. 7, No. 4 (2017)
       
  • Quantum Sensors for the Generating Functional of Interacting Quantum Field
           Theories

    • Authors: A. Bermudez; G. Aarts, M. Müller
      First page: 041012
      Abstract: Author(s): A. Bermudez, G. Aarts, and M. Müller
      Quantum simulation offers a powerful approach to testing quantum field theories (QFTs) via precise manipulation of atomic and molecular experiments that emulate the theories under investigation. A new analysis introduces a protocol for implementing a generating functional, the cornerstone of any QFT, in the lab.
      [Phys. Rev. X 7, 041012] Published Thu Oct 19, 2017
      Citation: Phys. Rev. X 7, 041012 (2017)
      PubDate: 2017-10-19T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041012
      Issue No: Vol. 7, No. 4 (2017)
       
  • Ultrafast Gap Dynamics and Electronic Interactions in a Photoexcited
           Cuprate Superconductor

    • Authors: S. Parham; H. Li, T. J. Nummy, J. A. Waugh, X. Q. Zhou, J. Griffith, J. Schneeloch, R. D. Zhong, G. D. Gu, D. S. Dessau
      First page: 041013
      Abstract: Author(s): S. Parham, H. Li, T. J. Nummy, J. A. Waugh, X. Q. Zhou, J. Griffith, J. Schneeloch, R. D. Zhong, G. D. Gu, and D. S. Dessau
      New investigations of a type of high-temperature superconductor using time- and angle-resolved photoemission spectroscopy reveal new details about the nature of photoexcitation and its relation to superconductivity.
      [Phys. Rev. X 7, 041013] Published Fri Oct 20, 2017
      Citation: Phys. Rev. X 7, 041013 (2017)
      PubDate: 2017-10-20T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041013
      Issue No: Vol. 7, No. 4 (2017)
       
  • Global Formation of Topological Defects in the Multiferroic Hexagonal
           Manganites

    • Authors: Q. N. Meier; M. Lilienblum, S. M. Griffin, K. Conder, E. Pomjakushina, Z. Yan, E. Bourret, D. Meier, F. Lichtenberg, E. K. H. Salje, N. A. Spaldin, M. Fiebig, A. Cano
      First page: 041014
      Abstract: Author(s): Q. N. Meier, M. Lilienblum, S. M. Griffin, K. Conder, E. Pomjakushina, Z. Yan, E. Bourret, D. Meier, F. Lichtenberg, E. K. H. Salje, N. A. Spaldin, M. Fiebig, and A. Cano
      The Kibble-Zurek mechanism describes the formation of topological defects in the wake of continuous phase transitions. A new analysis presents a global upgrade to this picture that reveals new phenomena as fluctuations in the system transform from strongly interacting to noninteracting.
      [Phys. Rev. X 7, 041014] Published Fri Oct 20, 2017
      Citation: Phys. Rev. X 7, 041014 (2017)
      PubDate: 2017-10-20T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041014
      Issue No: Vol. 7, No. 4 (2017)
       
  • Driven Quantum Dynamics: Will It Blend'

    • Authors: Leonardo Banchi; Daniel Burgarth, Michael J. Kastoryano
      First page: 041015
      Abstract: Author(s): Leonardo Banchi, Daniel Burgarth, and Michael J. Kastoryano
      Random number generation plays a pivotal role in quantum information applications (such as encryption), but generating random quantum operations requires exceptionally complex resources. A new theoretical analysis shows that an interacting many-body system can blend classical randomness through its dynamics to create quantum randomness.
      [Phys. Rev. X 7, 041015] Published Fri Oct 20, 2017
      Citation: Phys. Rev. X 7, 041015 (2017)
      PubDate: 2017-10-20T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041015
      Issue No: Vol. 7, No. 4 (2017)
       
  • Symmetry and Duality in Bosonization of Two-Dimensional Dirac Fermions

    • Authors: David F. Mross; Jason Alicea, Olexei I. Motrunich
      First page: 041016
      Abstract: Author(s): David F. Mross, Jason Alicea, and Olexei I. Motrunich
      Dualities help theorists describe complex systems using the language of systems that are easier to understand, but keeping track of symmetries and constructing concrete models is often nontrivial. A new analysis presents exact mappings for dual theories used to describe Dirac fermions in two dimensions.
      [Phys. Rev. X 7, 041016] Published Mon Oct 23, 2017
      Citation: Phys. Rev. X 7, 041016 (2017)
      PubDate: 2017-10-23T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041016
      Issue No: Vol. 7, No. 4 (2017)
       
  • New Tunneling Features in Polar III-Nitride Resonant Tunneling Diodes

    • Authors: Jimy Encomendero; Faiza Afroz Faria, S. M. Islam, Vladimir Protasenko, Sergei Rouvimov, Berardi Sensale-Rodriguez, Patrick Fay, Debdeep Jena, Huili Grace Xing
      First page: 041017
      Abstract: Author(s): Jimy Encomendero, Faiza Afroz Faria, S. M. Islam, Vladimir Protasenko, Sergei Rouvimov, Berardi Sensale-Rodriguez, Patrick Fay, Debdeep Jena, and Huili Grace Xing
      Resonant tunneling diodes, being the fastest electronic devices to date, operate by relying on one of the most surprising quantum-mechanical effects: tunneling. Taking advantage of this ultrafast process, however, has proven to be difficult within the nitride family of semiconductors. New techniques for growing GaN crystals have now led to unprecedented observations of resonant tunneling physics in nitride quantum devices.
      [Phys. Rev. X 7, 041017] Published Mon Oct 23, 2017
      Citation: Phys. Rev. X 7, 041017 (2017)
      PubDate: 2017-10-23T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041017
      Issue No: Vol. 7, No. 4 (2017)
       
  • Correlation Effects and Hidden Spin-Orbit Entangled Electronic Order in
           Parent and Electron-Doped Iridates ${\mathrm{Sr}}_{2}{\mathrm{IrO}}_{4}$

    • Authors: Sen Zhou; Kun Jiang, Hua Chen, Ziqiang Wang
      First page: 041018
      Abstract: Author(s): Sen Zhou, Kun Jiang, Hua Chen, and Ziqiang Wang
      High-temperature superconductors such as cuprates exhibit strange behaviors when they are in a metallic state, for example at temperatures above their critical temperature. A new theoretical analysis of the perovskite iridate Sr2IrO4, which shares some properties with cuprates, offers insight into the reason for these behaviors.
      [Phys. Rev. X 7, 041018] Published Tue Oct 24, 2017
      Citation: Phys. Rev. X 7, 041018 (2017)
      PubDate: 2017-10-24T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041018
      Issue No: Vol. 7, No. 4 (2017)
       
  • Acoustic Traps and Lattices for Electrons in Semiconductors

    • Authors: M. J. A. Schuetz; J. Knörzer, G. Giedke, L. M. K. Vandersypen, M. D. Lukin, J. I. Cirac
      First page: 041019
      Abstract: Author(s): M. J. A. Schuetz, J. Knörzer, G. Giedke, L. M. K. Vandersypen, M. D. Lukin, and J. I. Cirac
      Electrons and quasiparticles in solids could be trapped and moved using surface acoustic waves.
      [Phys. Rev. X 7, 041019] Published Tue Oct 24, 2017
      Citation: Phys. Rev. X 7, 041019 (2017)
      PubDate: 2017-10-24T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041019
      Issue No: Vol. 7, No. 4 (2017)
       
  • Electronic Structure of the Metastable Epitaxial Rock-Salt SnSe ${111}$
           Topological Crystalline Insulator

    • Authors: Wencan Jin; Suresh Vishwanath, Jianpeng Liu, Lingyuan Kong, Rui Lou, Zhongwei Dai, Jerzy T. Sadowski, Xinyu Liu, Huai-Hsun Lien, Alexander Chaney, Yimo Han, Michael Cao, Junzhang Ma, Tian Qian, Shancai Wang, Malgorzata Dobrowolska, Jacek Furdyna, David A. Muller, Karsten Pohl, Hong Ding, Jerry I. Dadap, Huili Grace Xing, Richard M. Osgood, Jr.
      First page: 041020
      Abstract: Author(s): Wencan Jin, Suresh Vishwanath, Jianpeng Liu, Lingyuan Kong, Rui Lou, Zhongwei Dai, Jerzy T. Sadowski, Xinyu Liu, Huai-Hsun Lien, Alexander Chaney, Yimo Han, Michael Cao, Junzhang Ma, Tian Qian, Shancai Wang, Malgorzata Dobrowolska, Jacek Furdyna, David A. Muller, Karsten Pohl, Hong Ding, Jerry I. Dadap, Huili Grace Xing, and Richard M. Osgood, Jr.
      Topological crystalline insulators are one of a new class of materials whose surface electronic behavior differs from its interior behavior, although it’s not clear how the internal structure affects the surface and vice versa. New experiments take a close look at these connections in metastable tin selenide, a semiconductor that can exhibit topological behaviors.
      [Phys. Rev. X 7, 041020] Published Wed Oct 25, 2017
      Citation: Phys. Rev. X 7, 041020 (2017)
      PubDate: 2017-10-25T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041020
      Issue No: Vol. 7, No. 4 (2017)
       
  • Many-Body Localization with Long-Range Interactions

    • Authors: Rahul M. Nandkishore; S. L. Sondhi
      First page: 041021
      Abstract: Author(s): Rahul M. Nandkishore and S. L. Sondhi
      Many-body localization is widely assumed to not be compatible with physical systems that exhibit long-range interactions. A new theoretical analysis shows that it is compatible with such systems, thus opening many-body localization physics to a wide range of novel situations.
      [Phys. Rev. X 7, 041021] Published Wed Oct 25, 2017
      Citation: Phys. Rev. X 7, 041021 (2017)
      PubDate: 2017-10-25T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041021
      Issue No: Vol. 7, No. 4 (2017)
       
  • Background-Free 3D Nanometric Localization and Sub-nm Asymmetry Detection
           of Single Plasmonic Nanoparticles by Four-Wave Mixing Interferometry with
           Optical Vortices

    • Authors: George Zoriniants; Francesco Masia, Naya Giannakopoulou, Wolfgang Langbein, Paola Borri
      First page: 041022
      Abstract: Author(s): George Zoriniants, Francesco Masia, Naya Giannakopoulou, Wolfgang Langbein, and Paola Borri
      Despite many advances, rapid, precise 3D tracking of nanoscale particles in a complex environment remains challenging. A new technique based on four-wave mixing interferometry not only precisely tracks a gold nanoparticle but also is sensitive to particle asymmetry and orientation.
      [Phys. Rev. X 7, 041022] Published Fri Oct 27, 2017
      Citation: Phys. Rev. X 7, 041022 (2017)
      PubDate: 2017-10-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041022
      Issue No: Vol. 7, No. 4 (2017)
       
  • Deterministic Generation of All-Photonic Quantum Repeaters from
           Solid-State Emitters

    • Authors: Donovan Buterakos; Edwin Barnes, Sophia E. Economou
      First page: 041023
      Abstract: Author(s): Donovan Buterakos, Edwin Barnes, and Sophia E. Economou
      Quantum repeaters allow for reliable transmission of quantum information over long distances. One possible approach relies on highly entangled photons. A new protocol provides a way to generate arbitrarily large states of entangled photons using just one emitter coupled to a single qubit.
      [Phys. Rev. X 7, 041023] Published Fri Oct 27, 2017
      Citation: Phys. Rev. X 7, 041023 (2017)
      PubDate: 2017-10-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041023
      Issue No: Vol. 7, No. 4 (2017)
       
  • Relating Topological Determinants of Complex Networks to Their Spectral
           Properties: Structural and Dynamical Effects

    • Authors: Claudio Castellano; Romualdo Pastor-Satorras
      First page: 041024
      Abstract: Author(s): Claudio Castellano and Romualdo Pastor-Satorras
      A key parameter for characterizing disease outbreaks and other types of dynamics on complex networks is the largest eigenvalue of the adjacency matrix. A new analysis presents a very general way of estimating it and a physical interpretation of its value.
      [Phys. Rev. X 7, 041024] Published Fri Oct 27, 2017
      Citation: Phys. Rev. X 7, 041024 (2017)
      PubDate: 2017-10-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041024
      Issue No: Vol. 7, No. 4 (2017)
       
  • Constraining Nonperturbative Strong-Field Effects in Scalar-Tensor Gravity
           by Combining Pulsar Timing and Laser-Interferometer Gravitational-Wave
           Detectors

    • Authors: Lijing Shao; Noah Sennett, Alessandra Buonanno, Michael Kramer, Norbert Wex
      First page: 041025
      Abstract: Author(s): Lijing Shao, Noah Sennett, Alessandra Buonanno, Michael Kramer, and Norbert Wex
      Pulsar timing and laser-interferometer gravitational-wave observations are two powerful astronomical tools for testing our understanding of gravity. A new analysis demonstrates the complementarity of these techniques. As new observatories come online in the coming years, combining these measurements could improve constraints on an illustrative class of theories that modify Einstein’s general theory of relativity.
      [Phys. Rev. X 7, 041025] Published Fri Oct 27, 2017
      Citation: Phys. Rev. X 7, 041025 (2017)
      PubDate: 2017-10-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041025
      Issue No: Vol. 7, No. 4 (2017)
       
  • Designer Curved-Space Geometry for Relativistic Fermions in Weyl
           Metamaterials

    • Authors: Alex Westström; Teemu Ojanen
      First page: 041026
      Abstract: Author(s): Alex Westström and Teemu Ojanen
      In a Weyl semimetal, the behavior of charge carriers mirrors the physics of Einstein’s special relativity. A new analysis shows how to engineer materials where the particles mimic the principles of general relativity, opening the door to novel electronic devices.
      [Phys. Rev. X 7, 041026] Published Mon Oct 30, 2017
      Citation: Phys. Rev. X 7, 041026 (2017)
      PubDate: 2017-10-30T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041026
      Issue No: Vol. 7, No. 4 (2017)
       
  • Second-Order Free-Riding on Antisocial Punishment Restores the
           Effectiveness of Prosocial Punishment

    • Authors: Attila Szolnoki; Matjaž Perc
      First page: 041027
      Abstract: Author(s): Attila Szolnoki and Matjaž Perc
      The effectiveness of punishment can be challenged by an unwillingness to shoulder the costs of punishment and by noncooperators who punish cooperators. Simulations based on techniques from statistical physics show how these can cancel one another in an unlikely and counterintuitive evolutionary outcome.
      [Phys. Rev. X 7, 041027] Published Mon Oct 30, 2017
      Citation: Phys. Rev. X 7, 041027 (2017)
      PubDate: 2017-10-30T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041027
      Issue No: Vol. 7, No. 4 (2017)
       
  • Disorder and Quantum Spin Ice

    • Authors: N. Martin; P. Bonville, E. Lhotel, S. Guitteny, A. Wildes, C. Decorse, M. Ciomaga Hatnean, G. Balakrishnan, I. Mirebeau, S. Petit
      First page: 041028
      Abstract: Author(s): N. Martin, P. Bonville, E. Lhotel, S. Guitteny, A. Wildes, C. Decorse, M. Ciomaga Hatnean, G. Balakrishnan, I. Mirebeau, and S. Petit
      Randomness in the arrangement of molecules within certain types of frustrated magnets may offer a way to promote and stabilize exotic states of matter known as spin liquids. New neutron-scattering experiments characterize the disorder in the spin ice candidate Pr2Zr2O7 and provide an explanation for some of this material’s unique properties.
      [Phys. Rev. X 7, 041028] Published Tue Oct 31, 2017
      Citation: Phys. Rev. X 7, 041028 (2017)
      PubDate: 2017-10-31T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041028
      Issue No: Vol. 7, No. 4 (2017)
       
  • Change in Stripes for Cholesteric Shells via Anchoring in Moderation

    • Authors: Lisa Tran; Maxim O. Lavrentovich, Guillaume Durey, Alexandre Darmon, Martin F. Haase, Ningwei Li, Daeyeon Lee, Kathleen J. Stebe, Randall D. Kamien, Teresa Lopez-Leon
      First page: 041029
      Abstract: Author(s): Lisa Tran, Maxim O. Lavrentovich, Guillaume Durey, Alexandre Darmon, Martin F. Haase, Ningwei Li, Daeyeon Lee, Kathleen J. Stebe, Randall D. Kamien, and Teresa Lopez-Leon
      Changing the geometrical organization of molecules in a liquid crystal can change how objects move within it and how it interacts with light, opening a door to novel applications. New experiments show how to produce a wealth of patterns in cholesteric liquid crystals, revealing also how these materials transition from one pattern to another.
      [Phys. Rev. X 7, 041029] Published Wed Nov 01, 2017
      Citation: Phys. Rev. X 7, 041029 (2017)
      PubDate: 2017-11-01T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041029
      Issue No: Vol. 7, No. 4 (2017)
       
  • Attosecond Streaking in the Water Window: A New Regime of Attosecond Pulse
           Characterization

    • Authors: Seth L. Cousin; Nicola Di Palo, Bárbara Buades, Stephan M. Teichmann, M. Reduzzi, M. Devetta, A. Kheifets, G. Sansone, Jens Biegert
      First page: 041030
      Abstract: Author(s): Seth L. Cousin, Nicola Di Palo, Bárbara Buades, Stephan M. Teichmann, M. Reduzzi, M. Devetta, A. Kheifets, G. Sansone, and Jens Biegert
      Pulses of x-ray light that last mere attoseconds are essential to capturing fundamental processes in nature, such as the motion of electrons and their role in chemical bonding. New experiments generate and, for the first time, characterize attosecond pulses in the soft-x-ray portion of the spectrum.
      [Phys. Rev. X 7, 041030] Published Thu Nov 02, 2017
      Citation: Phys. Rev. X 7, 041030 (2017)
      PubDate: 2017-11-02T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041030
      Issue No: Vol. 7, No. 4 (2017)
       
  • Strain-Dependent Solid Surface Stress and the Stiffness of Soft Contacts

    • Authors: Katharine E. Jensen; Robert W. Style, Qin Xu, Eric R. Dufresne
      First page: 041031
      Abstract: Author(s): Katharine E. Jensen, Robert W. Style, Qin Xu, and Eric R. Dufresne
      Despite the ubiquity of soft adhesives in everyday materials, much of their underlying physics remains unknown. New experiments in which small glass spheres are pulled from a silicone gel reveal crucial differences in how soft and stiff materials adhere.
      [Phys. Rev. X 7, 041031] Published Thu Nov 09, 2017
      Citation: Phys. Rev. X 7, 041031 (2017)
      PubDate: 2017-11-09T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041031
      Issue No: Vol. 7, No. 4 (2017)
       
  • Bimetric Theory of Fractional Quantum Hall States

    • Authors: Andrey Gromov; Dam Thanh Son
      First page: 041032
      Abstract: Author(s): Andrey Gromov and Dam Thanh Son
      While the edge states of a 2D electron gas in the fractional quantum Hall regime have many fascinating properties, the bulk dynamics are widely assumed to be uninteresting. A new theory reveals not only rich behavior in the bulk but also a unified framework for deriving known properties of this state.
      [Phys. Rev. X 7, 041032] Published Fri Nov 10, 2017
      Citation: Phys. Rev. X 7, 041032 (2017)
      PubDate: 2017-11-10T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041032
      Issue No: Vol. 7, No. 4 (2017)
       
  • Third Law of Thermodynamics as a Single Inequality

    • Authors: Henrik Wilming; Rodrigo Gallego
      First page: 041033
      Abstract: Author(s): Henrik Wilming and Rodrigo Gallego
      The third law of thermodynamics dictates that it is impossible to cool anything to absolute zero in a finite amount of time and with finite resources, but the law lacks a quantitative formulation to express the limits of what is allowed. A new analysis introduces such a formulation, which quantifies how close to zero a system can get given some initial amount of energy.
      [Phys. Rev. X 7, 041033] Published Mon Nov 13, 2017
      Citation: Phys. Rev. X 7, 041033 (2017)
      PubDate: 2017-11-13T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041033
      Issue No: Vol. 7, No. 4 (2017)
       
  • Search for Axionlike Dark Matter through Nuclear Spin Precession in
           Electric and Magnetic Fields

    • Authors: C. Abel et al.
      First page: 041034
      Abstract: Author(s): C. Abel et al.
      An analysis of spin-precession data of atoms and neutrons sets some of the tightest limits to date on the strength of interactions between axions and gluons or nucleons.
      [Phys. Rev. X 7, 041034] Published Tue Nov 14, 2017
      Citation: Phys. Rev. X 7, 041034 (2017)
      PubDate: 2017-11-14T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041034
      Issue No: Vol. 7, No. 4 (2017)
       
  • Three-Body Coulomb Problem

    • Authors: R. Combescot
      First page: 041035
      Abstract: Author(s): R. Combescot
      Describing three bodies moving under known mutual forces is difficult, especially in quantum mechanics. On the other hand, the two-body problem is very simple. A new method uses the two-body solution to solve this three-body problem.
      [Phys. Rev. X 7, 041035] Published Wed Nov 15, 2017
      Citation: Phys. Rev. X 7, 041035 (2017)
      PubDate: 2017-11-15T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041035
      Issue No: Vol. 7, No. 4 (2017)
       
  • Simultaneous, Full Characterization of a Single-Photon State

    • Authors: Tim Thomay; Sergey V. Polyakov, Olivier Gazzano, Elizabeth Goldschmidt, Zachary D. Eldredge, Tobias Huber, Vivien Loo, Glenn S. Solomon
      First page: 041036
      Abstract: Author(s): Tim Thomay, Sergey V. Polyakov, Olivier Gazzano, Elizabeth Goldschmidt, Zachary D. Eldredge, Tobias Huber, Vivien Loo, and Glenn S. Solomon
      Advances in quantum optics and quantum information technologies increasingly require a way to fully understand the state of single indistinguishable photons. While previous approaches have needed two or more measurements, a new experiment demonstrates a way to characterize single-photon states with just one measurement.
      [Phys. Rev. X 7, 041036] Published Wed Nov 15, 2017
      Citation: Phys. Rev. X 7, 041036 (2017)
      PubDate: 2017-11-15T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.041036
      Issue No: Vol. 7, No. 4 (2017)
       
  • Demonstration of Efficient Nonreciprocity in a Microwave Optomechanical
           Circuit

    • Authors: G. A. Peterson; F. Lecocq, K. Cicak, R. W. Simmonds, J. Aumentado, J. D. Teufel
      First page: 031001
      Abstract: Author(s): G. A. Peterson, F. Lecocq, K. Cicak, R. W. Simmonds, J. Aumentado, and J. D. Teufel
      Nonreciprocal devices, in which electrical or optical signals travel in one direction only, are essential for telecommunication and quantum applications, but they are often both lossy and bulky to implement. A prototype device demonstrates nonreciprocity in a microwave optomechanical circuit that allows for dynamic isolation control while avoiding the need for large magnetic fields.
      [Phys. Rev. X 7, 031001] Published Thu Jul 06, 2017
      Citation: Phys. Rev. X 7, 031001 (2017)
      PubDate: 2017-07-06T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031001
      Issue No: Vol. 7, No. 3 (2017)
       
  • Coherent Rabi Dynamics of a Superradiant Spin Ensemble in a Microwave
           Cavity

    • Authors: B. C. Rose; A. M. Tyryshkin, H. Riemann, N. V. Abrosimov, P. Becker, H.-J. Pohl, M. L. W. Thewalt, K. M. Itoh, S. A. Lyon
      First page: 031002
      Abstract: Author(s): B. C. Rose, A. M. Tyryshkin, H. Riemann, N. V. Abrosimov, P. Becker, H.-J. Pohl, M. L. W. Thewalt, K. M. Itoh, and S. A. Lyon
      Ensembles of electron spins can couple to one another and emit collectively in a process known as “superradiance.” Researchers demonstrate strong coupling of a superradiant ensemble of donor spins in silicon, paving the way for future studies of entanglement and implementing a spin ensemble quantum memory.
      [Phys. Rev. X 7, 031002] Published Mon Jul 10, 2017
      Citation: Phys. Rev. X 7, 031002 (2017)
      PubDate: 2017-07-10T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031002
      Issue No: Vol. 7, No. 3 (2017)
       
  • Fingerprinting Molecular Relaxation in Deformed Polymers

    • Authors: Zhe Wang; Christopher N. Lam, Wei-Ren Chen, Weiyu Wang, Jianning Liu, Yun Liu, Lionel Porcar, Christopher B. Stanley, Zhichen Zhao, Kunlun Hong, Yangyang Wang
      First page: 031003
      Abstract: Author(s): Zhe Wang, Christopher N. Lam, Wei-Ren Chen, Weiyu Wang, Jianning Liu, Yun Liu, Lionel Porcar, Christopher B. Stanley, Zhichen Zhao, Kunlun Hong, and Yangyang Wang
      Results from a new method of analyzing neutron-scattering data from polymer samples under deformation may challenge the prevailing “tube model” of polymer motion.
      [Phys. Rev. X 7, 031003] Published Mon Jul 10, 2017
      Citation: Phys. Rev. X 7, 031003 (2017)
      PubDate: 2017-07-10T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031003
      Issue No: Vol. 7, No. 3 (2017)
       
  • Flow Ambiguity: A Path Towards Classically Driven Blind Quantum
           Computation

    • Authors: Atul Mantri; Tommaso F. Demarie, Nicolas C. Menicucci, Joseph F. Fitzsimons
      First page: 031004
      Abstract: Author(s): Atul Mantri, Tommaso F. Demarie, Nicolas C. Menicucci, and Joseph F. Fitzsimons
      Current protocols for securely delegating computation to remote quantum computers require some form of quantum communication, thus limiting secure access to future cloud-based quantum computing resources. A new analysis shows that it is possible to hide critical aspects of a computation delegated to a quantum computer using only classical communication.
      [Phys. Rev. X 7, 031004] Published Tue Jul 11, 2017
      Citation: Phys. Rev. X 7, 031004 (2017)
      PubDate: 2017-07-11T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031004
      Issue No: Vol. 7, No. 3 (2017)
       
  • Rotation-Induced Macromolecular Spooling of DNA

    • Authors: Tyler N. Shendruk; David Sean, Daniel J. Berard, Julian Wolf, Justin Dragoman, Sophie Battat, Gary W. Slater, Sabrina R. Leslie
      First page: 031005
      Abstract: Author(s): Tyler N. Shendruk, David Sean, Daniel J. Berard, Julian Wolf, Justin Dragoman, Sophie Battat, Gary W. Slater, and Sabrina R. Leslie
      DNA’s many tangles and loops make it difficult to take an accurate inventory of in vitro genetic material. Now, researchers show how DNA can be wrapped in a single strand around a rotating micrometer-sized cylinder.
      [Phys. Rev. X 7, 031005] Published Tue Jul 11, 2017
      Citation: Phys. Rev. X 7, 031005 (2017)
      PubDate: 2017-07-11T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031005
      Issue No: Vol. 7, No. 3 (2017)
       
  • Black Hole on a Chip: Proposal for a Physical Realization of the
           Sachdev-Ye-Kitaev model in a Solid-State System

    • Authors: D. I. Pikulin; M. Franz
      First page: 031006
      Abstract: Author(s): D. I. Pikulin and M. Franz
      General relativity and quantum mechanics are at odds in the extreme environments of black holes, but black holes can only be observed from large distances. Scientists propose a solid-state “black hole on a chip” using the interface between a three-dimensional topological insulator and an ordinary superconductor.
      [Phys. Rev. X 7, 031006] Published Thu Jul 13, 2017
      Citation: Phys. Rev. X 7, 031006 (2017)
      PubDate: 2017-07-13T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031006
      Issue No: Vol. 7, No. 3 (2017)
       
  • Coherent Photon Manipulation in Interacting Atomic Ensembles

    • Authors: Callum R. Murray; Thomas Pohl
      First page: 031007
      Abstract: Author(s): Callum R. Murray and Thomas Pohl
      The quantum information processing techniques of the future may rely on photon-photon interactions, which researchers now theoretically demonstrate are possible using polaritons, a type of quasiparticle.
      [Phys. Rev. X 7, 031007] Published Thu Jul 13, 2017
      Citation: Phys. Rev. X 7, 031007 (2017)
      PubDate: 2017-07-13T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031007
      Issue No: Vol. 7, No. 3 (2017)
       
  • Spatial Evolution of Human Dialects

    • Authors: James Burridge
      First page: 031008
      Abstract: Author(s): James Burridge
      A new model of language evolution assumes that changes in the spatial boundaries between dialects are controlled by a surface tension effect.
      [Phys. Rev. X 7, 031008] Published Mon Jul 17, 2017
      Citation: Phys. Rev. X 7, 031008 (2017)
      PubDate: 2017-07-17T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031008
      Issue No: Vol. 7, No. 3 (2017)
       
  • Pairing in Luttinger Liquids and Quantum Hall States

    • Authors: Charles L. Kane; Ady Stern, Bertrand I. Halperin
      First page: 031009
      Abstract: Author(s): Charles L. Kane, Ady Stern, and Bertrand I. Halperin
      Theories for understanding two-dimensional electronic systems, such as certain exotic states that could be useful for quantum computing, are not as well developed as their one-dimensional counterparts. A new mathematical analysis extends a successful theory for one-dimensional conductors—Luttinger liquid theory—to two dimensions, revealing novel properties of these systems.
      [Phys. Rev. X 7, 031009] Published Tue Jul 18, 2017
      Citation: Phys. Rev. X 7, 031009 (2017)
      PubDate: 2017-07-18T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031009
      Issue No: Vol. 7, No. 3 (2017)
       
  • Stretchable Persistent Spin Helices in GaAs Quantum Wells

    • Authors: Florian Dettwiler; Jiyong Fu, Shawn Mack, Pirmin J. Weigele, J. Carlos Egues, David D. Awschalom, Dominik M. Zumbühl
      First page: 031010
      Abstract: Author(s): Florian Dettwiler, Jiyong Fu, Shawn Mack, Pirmin J. Weigele, J. Carlos Egues, David D. Awschalom, and Dominik M. Zumbühl
      Controlling the electron spin could be an effective way to store and manipulate information in quantum devices, but it is challenging because spins randomize over time. A novel technique demonstrates, experimentally, a way to manipulate spin as an electron travels across a chip while being protected from randomization.
      [Phys. Rev. X 7, 031010] Published Tue Jul 18, 2017
      Citation: Phys. Rev. X 7, 031010 (2017)
      PubDate: 2017-07-18T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031010
      Issue No: Vol. 7, No. 3 (2017)
       
  • Measuring Out-of-Time-Order Correlators on a Nuclear Magnetic Resonance
           Quantum Simulator

    • Authors: Jun Li; Ruihua Fan, Hengyan Wang, Bingtian Ye, Bei Zeng, Hui Zhai, Xinhua Peng, Jiangfeng Du
      First page: 031011
      Abstract: Author(s): Jun Li, Ruihua Fan, Hengyan Wang, Bingtian Ye, Bei Zeng, Hui Zhai, Xinhua Peng, and Jiangfeng Du
      Two experimental groups have taken a step towards observing the “scrambling” of information that occurs as a many-body quantum system thermalizes.
      [Phys. Rev. X 7, 031011] Published Wed Jul 19, 2017
      Citation: Phys. Rev. X 7, 031011 (2017)
      PubDate: 2017-07-19T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031011
      Issue No: Vol. 7, No. 3 (2017)
       
  • Tomography of a Mode-Tunable Coherent Single-Photon Subtractor

    • Authors: Young-Sik Ra; Clément Jacquard, Adrien Dufour, Claude Fabre, Nicolas Treps
      First page: 031012
      Abstract: Author(s): Young-Sik Ra, Clément Jacquard, Adrien Dufour, Claude Fabre, and Nicolas Treps
      A mode-selective nonlinear optics technique is used to extract a single photon from multimode light, a key operation for hybrid optical quantum information processing.
      [Phys. Rev. X 7, 031012] Published Wed Jul 19, 2017
      Citation: Phys. Rev. X 7, 031012 (2017)
      PubDate: 2017-07-19T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031012
      Issue No: Vol. 7, No. 3 (2017)
       
  • Fork Tensor-Product States: Efficient Multiorbital Real-Time DMFT Solver

    • Authors: Daniel Bauernfeind; Manuel Zingl, Robert Triebl, Markus Aichhorn, Hans Gerd Evertz
      First page: 031013
      Abstract: Author(s): Daniel Bauernfeind, Manuel Zingl, Robert Triebl, Markus Aichhorn, and Hans Gerd Evertz
      Theoretically characterizing materials that are strongly correlated has been a long-standing challenge. A new method models the atomic excitations of such materials with high resolution at all energies
      [Phys. Rev. X 7, 031013] Published Thu Jul 20, 2017
      Citation: Phys. Rev. X 7, 031013 (2017)
      PubDate: 2017-07-20T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031013
      Issue No: Vol. 7, No. 3 (2017)
       
  • Stochastic p-Bits for Invertible Logic

    • Authors: Kerem Yunus Camsari; Rafatul Faria, Brian M. Sutton, Supriyo Datta
      First page: 031014
      Abstract: Author(s): Kerem Yunus Camsari, Rafatul Faria, Brian M. Sutton, and Supriyo Datta
      Digital electronics are based on deterministic units called bits that can have one of two values, 0 and 1. New theoretical work suggests that circuits built out of probabilistic units that fluctuate randomly in value between 0 and 1 can be used to perform multiple functions: A multiplier, for example, can also function as a factorizer.
      [Phys. Rev. X 7, 031014] Published Thu Jul 20, 2017
      Citation: Phys. Rev. X 7, 031014 (2017)
      PubDate: 2017-07-20T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031014
      Issue No: Vol. 7, No. 3 (2017)
       
  • High-Performance Versatile Setup for Simultaneous Brillouin-Raman
           Microspectroscopy

    • Authors: F. Scarponi; S. Mattana, S. Corezzi, S. Caponi, L. Comez, P. Sassi, A. Morresi, M. Paolantoni, L. Urbanelli, C. Emiliani, L. Roscini, L. Corte, G. Cardinali, F. Palombo, J. R. Sandercock, D. Fioretto
      First page: 031015
      Abstract: Author(s): F. Scarponi, S. Mattana, S. Corezzi, S. Caponi, L. Comez, P. Sassi, A. Morresi, M. Paolantoni, L. Urbanelli, C. Emiliani, L. Roscini, L. Corte, G. Cardinali, F. Palombo, J. R. Sandercock, and D. Fioretto
      Spectroscopy of soft matter such as biological material suffers from low contrast and low resolution. A prototype of a new instrument concept that combines Raman and Brillouin spectrometry, however, demonstrates superior performance for studying the chemical makeup and mechanical properties of matter in a variety of applications.
      [Phys. Rev. X 7, 031015] Published Fri Jul 21, 2017
      Citation: Phys. Rev. X 7, 031015 (2017)
      PubDate: 2017-07-21T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031015
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Entanglement Growth under Random Unitary Dynamics

    • Authors: Adam Nahum; Jonathan Ruhman, Sagar Vijay, Jeongwan Haah
      First page: 031016
      Abstract: Author(s): Adam Nahum, Jonathan Ruhman, Sagar Vijay, and Jeongwan Haah
      Physicists have long sought to understand how quantum dynamics generates the nonlocal correlations known as entanglement. Theoretical models are proposed to explain the growth of entanglement over time in different numbers of spatial dimensions.
      [Phys. Rev. X 7, 031016] Published Mon Jul 24, 2017
      Citation: Phys. Rev. X 7, 031016 (2017)
      PubDate: 2017-07-24T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031016
      Issue No: Vol. 7, No. 3 (2017)
       
  • Using Huygens Multipole Arrays to Realize Unidirectional Needle-Like
           Radiation

    • Authors: Richard W. Ziolkowski
      First page: 031017
      Abstract: Author(s): Richard W. Ziolkowski
      Experimentally confining radiation to certain limited directions (“needle radiation”) has numerous practical applications in wave-matter interaction disciplines. A theoretical proposal for realizing such superdirectivity is presented.
      [Phys. Rev. X 7, 031017] Published Wed Jul 26, 2017
      Citation: Phys. Rev. X 7, 031017 (2017)
      PubDate: 2017-07-26T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031017
      Issue No: Vol. 7, No. 3 (2017)
       
  • Strong Bias Effect on Voltage-Driven Torque at Epitaxial Fe-MgO Interface

    • Authors: Shinji Miwa; Junji Fujimoto, Philipp Risius, Kohei Nawaoka, Minori Goto, Yoshishige Suzuki
      First page: 031018
      Abstract: Author(s): Shinji Miwa, Junji Fujimoto, Philipp Risius, Kohei Nawaoka, Minori Goto, and Yoshishige Suzuki
      Spin torque is a promising technique for flipping magnetic orientation in nanomagnets used in low-power computer memories, but accurately measuring this torque is difficult. A new experiment shows how ferromagnetic resonance can characterize spin-torque vectors at an Fe-MgO interface.
      [Phys. Rev. X 7, 031018] Published Wed Jul 26, 2017
      Citation: Phys. Rev. X 7, 031018 (2017)
      PubDate: 2017-07-26T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031018
      Issue No: Vol. 7, No. 3 (2017)
       
  • Enthalpy Landscape Dictates the Irradiation-Induced Disordering of Quartz

    • Authors: N. M. Anoop Krishnan; Bu Wang, Yingtian Yu, Yann Le Pape, Gaurav Sant, Mathieu Bauchy
      First page: 031019
      Abstract: Author(s): N. M. Anoop Krishnan, Bu Wang, Yingtian Yu, Yann Le Pape, Gaurav Sant, and Mathieu Bauchy
      A physically sound understanding of how radiation-induced damage originates and accumulates in a material has long eluded researchers. New simulations show that the roughness of the enthalpy landscape determines the extent of this damage.
      [Phys. Rev. X 7, 031019] Published Fri Jul 28, 2017
      Citation: Phys. Rev. X 7, 031019 (2017)
      PubDate: 2017-07-28T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031019
      Issue No: Vol. 7, No. 3 (2017)
       
  • Signatures of Dirac Cones in a DMRG Study of the Kagome Heisenberg Model

    • Authors: Yin-Chen He; Michael P. Zaletel, Masaki Oshikawa, Frank Pollmann
      First page: 031020
      Abstract: Author(s): Yin-Chen He, Michael P. Zaletel, Masaki Oshikawa, and Frank Pollmann
      Realizing an exotic phase of matter known as a quantum spin liquid has long eluded condensed-matter physicists. Now strong evidence is found that a particular class of exotic states of matter called a Dirac spin liquid is realized in a popular model of numerous magnets.
      [Phys. Rev. X 7, 031020] Published Fri Jul 28, 2017
      Citation: Phys. Rev. X 7, 031020 (2017)
      PubDate: 2017-07-28T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031020
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Common Causes and Quantum Causal Models

    • Authors: John-Mark A. Allen; Jonathan Barrett, Dominic C. Horsman, Ciarán M. Lee, Robert W. Spekkens
      First page: 031021
      Abstract: Author(s): John-Mark A. Allen, Jonathan Barrett, Dominic C. Horsman, Ciarán M. Lee, and Robert W. Spekkens
      A new model extends the definition of causality to quantum-mechanical systems.
      [Phys. Rev. X 7, 031021] Published Mon Jul 31, 2017
      Citation: Phys. Rev. X 7, 031021 (2017)
      PubDate: 2017-07-31T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031021
      Issue No: Vol. 7, No. 3 (2017)
       
  • Autonomous Quantum Clocks: Does Thermodynamics Limit Our Ability to
           Measure Time'

    • Authors: Paul Erker; Mark T. Mitchison, Ralph Silva, Mischa P. Woods, Nicolas Brunner, Marcus Huber
      First page: 031022
      Abstract: Author(s): Paul Erker, Mark T. Mitchison, Ralph Silva, Mischa P. Woods, Nicolas Brunner, and Marcus Huber
      A simple model of an autonomous quantum clock yields a quantitative connection between the clock’s thermodynamic cost and its accuracy and resolution.
      [Phys. Rev. X 7, 031022] Published Wed Aug 02, 2017
      Citation: Phys. Rev. X 7, 031022 (2017)
      PubDate: 2017-08-02T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031022
      Issue No: Vol. 7, No. 3 (2017)
       
  • Observing Topological Invariants Using Quantum Walks in Superconducting
           Circuits

    • Authors: E. Flurin; V. V. Ramasesh, S. Hacohen-Gourgy, L. S. Martin, N. Y. Yao, I. Siddiqi
      First page: 031023
      Abstract: Author(s): E. Flurin, V. V. Ramasesh, S. Hacohen-Gourgy, L. S. Martin, N. Y. Yao, and I. Siddiqi
      Topological invariants, properties of a system that remain unchanged by small deformations, are key to modern understanding of phases of matter but have yet to be directly detected by experiment. A new quantum simulation shows how quantum walks can be used to measure topological invariants for the first time.
      [Phys. Rev. X 7, 031023] Published Thu Aug 03, 2017
      Citation: Phys. Rev. X 7, 031023 (2017)
      PubDate: 2017-08-03T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031023
      Issue No: Vol. 7, No. 3 (2017)
       
  • Exponential Improvement in Photon Storage Fidelities Using Subradiance and
           “Selective Radiance” in Atomic Arrays

    • Authors: A. Asenjo-Garcia; M. Moreno-Cardoner, A. Albrecht, H. J. Kimble, D. E. Chang
      First page: 031024
      Abstract: Author(s): A. Asenjo-Garcia, M. Moreno-Cardoner, A. Albrecht, H. J. Kimble, and D. E. Chang
      Light interacting with an ensemble of atoms can be used in quantum information processing, but the efficiency of performing any given task is limited by spontaneous emission of photons into channels that are not usable. A new analysis shows how interference among light emitted by nearby atoms can dramatically improve this efficiency and provide a much more powerful platform.
      [Phys. Rev. X 7, 031024] Published Thu Aug 03, 2017
      Citation: Phys. Rev. X 7, 031024 (2017)
      PubDate: 2017-08-03T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031024
      Issue No: Vol. 7, No. 3 (2017)
       
  • Measuring Entropy and Short-Range Correlations in the Two-Dimensional
           Hubbard Model

    • Authors: E. Cocchi; L. A. Miller, J. H. Drewes, C. F. Chan, D. Pertot, F. Brennecke, M. Köhl
      First page: 031025
      Abstract: Author(s): E. Cocchi, L. A. Miller, J. H. Drewes, C. F. Chan, D. Pertot, F. Brennecke, and M. Köhl
      The physics of strongly correlated matter, where interactions among atoms and particles can lead to exotic macroscopic properties, is difficult to understand theoretically. A realization of the leading theoretical model provides insight into these correlations from thermodynamic measurements.
      [Phys. Rev. X 7, 031025] Published Fri Aug 04, 2017
      Citation: Phys. Rev. X 7, 031025 (2017)
      PubDate: 2017-08-04T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031025
      Issue No: Vol. 7, No. 3 (2017)
       
  • Unitary Dynamics of Strongly Interacting Bose Gases with the
           Time-Dependent Variational Monte Carlo Method in Continuous Space

    • Authors: Giuseppe Carleo; Lorenzo Cevolani, Laurent Sanchez-Palencia, Markus Holzmann
      First page: 031026
      Abstract: Author(s): Giuseppe Carleo, Lorenzo Cevolani, Laurent Sanchez-Palencia, and Markus Holzmann
      Predicting the motions of quantum particles in large ensembles is mathematically complex and computationally expensive. A new theoretical method shows promise for predicting the dynamics of a gas of quantum particles by accurately describing the dynamics of one-dimensional strongly interacting bosons.
      [Phys. Rev. X 7, 031026] Published Tue Aug 08, 2017
      Citation: Phys. Rev. X 7, 031026 (2017)
      PubDate: 2017-08-08T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031026
      Issue No: Vol. 7, No. 3 (2017)
       
  • Equilibration Time Scales of Physically Relevant Observables

    • Authors: Luis Pedro García-Pintos; Noah Linden, Artur S. L. Malabarba, Anthony J. Short, Andreas Winter
      First page: 031027
      Abstract: Author(s): Luis Pedro García-Pintos, Noah Linden, Artur S. L. Malabarba, Anthony J. Short, and Andreas Winter
      The tendency for a macroscopic system to reach equilibrium could depend on underlying quantum behaviors, but showing that this can happen in a reasonable time is difficult. A new analysis demonstrates that for certain classes of physically relevant observables, conditions exist where this is possible.
      [Phys. Rev. X 7, 031027] Published Thu Aug 10, 2017
      Citation: Phys. Rev. X 7, 031027 (2017)
      PubDate: 2017-08-10T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031027
      Issue No: Vol. 7, No. 3 (2017)
       
  • Nonequilibrium Phase Transition in an Atomistic Glassformer: The
           Connection to Thermodynamics

    • Authors: Francesco Turci; C. Patrick Royall, Thomas Speck
      First page: 031028
      Abstract: Author(s): Francesco Turci, C. Patrick Royall, and Thomas Speck
      Computer simulations are used to model the phase change that occurs as glasses transition from a liquid phase to a so-called “ideal glass phase.”
      [Phys. Rev. X 7, 031028] Published Fri Aug 11, 2017
      Citation: Phys. Rev. X 7, 031028 (2017)
      PubDate: 2017-08-11T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031028
      Issue No: Vol. 7, No. 3 (2017)
       
  • Particle-Hole Symmetry in the Fermion-Chern-Simons and Dirac Descriptions
           of a Half-Filled Landau Level

    • Authors: Chong Wang; Nigel R. Cooper, Bertrand I. Halperin, Ady Stern
      First page: 031029
      Abstract: Author(s): Chong Wang, Nigel R. Cooper, Bertrand I. Halperin, and Ady Stern
      Multiple descriptions of the half-filled Landau level, an exotic phase of matter seen in two-dimensional electron gases, have led to incompatible pictures that are widely believed to represent two distinct phases of matter. A new analysis suggests that this is not the case and that these descriptions are functionally equivalent.
      [Phys. Rev. X 7, 031029] Published Mon Aug 14, 2017
      Citation: Phys. Rev. X 7, 031029 (2017)
      PubDate: 2017-08-14T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031029
      Issue No: Vol. 7, No. 3 (2017)
       
  • High-Resolution Two-Dimensional Optical Spectroscopy of Electron Spins

    • Authors: M. Salewski; S. V. Poltavtsev, I. A. Yugova, G. Karczewski, M. Wiater, T. Wojtowicz, D. R. Yakovlev, I. A. Akimov, T. Meier, M. Bayer
      First page: 031030
      Abstract: Author(s): M. Salewski, S. V. Poltavtsev, I. A. Yugova, G. Karczewski, M. Wiater, T. Wojtowicz, D. R. Yakovlev, I. A. Akimov, T. Meier, and M. Bayer
      Multidimensional coherent optical spectroscopy is currently one of the most powerful tools for investigating complex quantum-mechanical systems, but resolving energy splitting on megahertz scales remains a challenge. A new investigation shows how two-dimensional Fourier transform spectroscopy can be adapted to evaluate spin splitting of ground-state electrons.
      [Phys. Rev. X 7, 031030] Published Mon Aug 14, 2017
      Citation: Phys. Rev. X 7, 031030 (2017)
      PubDate: 2017-08-14T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031030
      Issue No: Vol. 7, No. 3 (2017)
       
  • Coexistence of Multiple Nonlinear States in a Tristable Passive Kerr
           Resonator

    • Authors: Miles Anderson; Yadong Wang, François Leo, Stéphane Coen, Miro Erkintalo, Stuart G. Murdoch
      First page: 031031
      Abstract: Author(s): Miles Anderson, Yadong Wang, François Leo, Stéphane Coen, Miro Erkintalo, and Stuart G. Murdoch
      Pattern formation in optical devices known as passive Kerr resonators has been studied for decades, but recent theoretical work has suggested the existence of entirely new dynamics when operated in the highly nonlinear regime. New experiments confirm these predictions, which could lead to innovative new sources of laser-like light and provide new insight into nonlinear dynamics and pattern formation.
      [Phys. Rev. X 7, 031031] Published Tue Aug 15, 2017
      Citation: Phys. Rev. X 7, 031031 (2017)
      PubDate: 2017-08-15T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031031
      Issue No: Vol. 7, No. 3 (2017)
       
  • Optical Interface States Protected by Synthetic Weyl Points

    • Authors: Qiang Wang; Meng Xiao, Hui Liu, Shining Zhu, C. T. Chan
      First page: 031032
      Abstract: Author(s): Qiang Wang, Meng Xiao, Hui Liu, Shining Zhu, and C. T. Chan
      Weyl points, characterized as nodal points in the band structure of solids, can give rise to novel physical properties but are difficult to investigate experimentally. A new analysis expands the scope of Weyl points using synthetic dimensions, paving the way for greater flexibility in future investigations.
      [Phys. Rev. X 7, 031032] Published Wed Aug 16, 2017
      Citation: Phys. Rev. X 7, 031032 (2017)
      PubDate: 2017-08-16T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031032
      Issue No: Vol. 7, No. 3 (2017)
       
  • Polariton Pattern Formation and Photon Statistics of the Associated
           Emission

    • Authors: C. E. Whittaker; B. Dzurnak, O. A. Egorov, G. Buonaiuto, P. M. Walker, E. Cancellieri, D. M. Whittaker, E. Clarke, S. S. Gavrilov, M. S. Skolnick, D. N. Krizhanovskii
      First page: 031033
      Abstract: Author(s): C. E. Whittaker, B. Dzurnak, O. A. Egorov, G. Buonaiuto, P. M. Walker, E. Cancellieri, D. M. Whittaker, E. Clarke, S. S. Gavrilov, M. S. Skolnick, and D. N. Krizhanovskii
      New experiments reveal a diverse family of polygon patterns forming spontaneously in a fluid of polaritons—quasiparticles comprised of photons coupled to electric dipoles. The observations could lead to new insights in pattern formation in nonlinear optical systems as well as in quantum statistics.
      [Phys. Rev. X 7, 031033] Published Mon Aug 21, 2017
      Citation: Phys. Rev. X 7, 031033 (2017)
      PubDate: 2017-08-21T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031033
      Issue No: Vol. 7, No. 3 (2017)
       
  • Aperiodically Driven Integrable Systems and Their Emergent Steady States

    • Authors: Sourav Nandy; Arnab Sen, Diptiman Sen
      First page: 031034
      Abstract: Author(s): Sourav Nandy, Arnab Sen, and Diptiman Sen
      Driving of many-body quantum systems leads to steady-state behavior not seen when the system is at equilibrium. While the outcome of a periodic drive is well explored, the same can’t be said for aperiodic drives. A new analysis shows that aperiodic drives can lead to novel steady-state behavior not seen in periodically driven systems.
      [Phys. Rev. X 7, 031034] Published Tue Aug 22, 2017
      Citation: Phys. Rev. X 7, 031034 (2017)
      PubDate: 2017-08-22T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031034
      Issue No: Vol. 7, No. 3 (2017)
       
  • On the Mass of Atoms in Molecules: Beyond the Born-Oppenheimer
           Approximation

    • Authors: Arne Scherrer; Federica Agostini, Daniel Sebastiani, E. K. U. Gross, Rodolphe Vuilleumier
      First page: 031035
      Abstract: Author(s): Arne Scherrer, Federica Agostini, Daniel Sebastiani, E. K. U. Gross, and Rodolphe Vuilleumier
      The Born-Oppenheimer approximation, used to predict atomic motions in quantum mechanics, leads to well-known inconsistencies caused by neglecting the effect of electron motion induced by nuclear evolution. A new theoretical paradigm resolves this problem, paving the way for high-precision predictions of vibrational frequencies of complex molecules.
      [Phys. Rev. X 7, 031035] Published Fri Aug 25, 2017
      Citation: Phys. Rev. X 7, 031035 (2017)
      PubDate: 2017-08-25T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031035
      Issue No: Vol. 7, No. 3 (2017)
       
  • Extreme-Ultraviolet Vortices from a Free-Electron Laser

    • Authors: Primož Rebernik Ribič; Benedikt Rösner, David Gauthier, Enrico Allaria, Florian Döring, Laura Foglia, Luca Giannessi, Nicola Mahne, Michele Manfredda, Claudio Masciovecchio, Riccardo Mincigrucci, Najmeh Mirian, Emiliano Principi, Eléonore Roussel, Alberto Simoncig, Simone Spampinati, Christian David, Giovanni De Ninno
      First page: 031036
      Abstract: Author(s): Primož Rebernik Ribič, Benedikt Rösner, David Gauthier, Enrico Allaria, Florian Döring, Laura Foglia, Luca Giannessi, Nicola Mahne, Michele Manfredda, Claudio Masciovecchio, Riccardo Mincigrucci, Najmeh Mirian, Emiliano Principi, Eléonore Roussel, Alberto Simoncig, Simone Spampinati, Christian David, and Giovanni De Ninno
      Researchers have used a free-electron laser to produce vortex radiation at extreme-ultraviolet wavelengths.
      [Phys. Rev. X 7, 031036] Published Mon Aug 28, 2017
      Citation: Phys. Rev. X 7, 031036 (2017)
      PubDate: 2017-08-28T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031036
      Issue No: Vol. 7, No. 3 (2017)
       
  • Fluxonium-Based Artificial Molecule with a Tunable Magnetic Moment

    • Authors: A. Kou; W. C. Smith, U. Vool, R. T. Brierley, H. Meier, L. Frunzio, S. M. Girvin, L. I. Glazman, M. H. Devoret
      First page: 031037
      Abstract: Author(s): A. Kou, W. C. Smith, U. Vool, R. T. Brierley, H. Meier, L. Frunzio, S. M. Girvin, L. I. Glazman, and M. H. Devoret
      Artificial molecules built from superconducting circuits can potentially be used as probes of external fields that cannot be studied with devices built from naturally occurring atoms. A new study demonstrates how the magnetic moment of a molecule built from two artificial fluxonium atoms changes in response to an external magnetic field.
      [Phys. Rev. X 7, 031037] Published Tue Aug 29, 2017
      Citation: Phys. Rev. X 7, 031037 (2017)
      PubDate: 2017-08-29T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031037
      Issue No: Vol. 7, No. 3 (2017)
       
  • Machine Learning Phases of Strongly Correlated Fermions

    • Authors: Kelvin Ch’ng; Juan Carrasquilla, Roger G. Melko, Ehsan Khatami
      First page: 031038
      Abstract: Author(s): Kelvin Ch’ng, Juan Carrasquilla, Roger G. Melko, and Ehsan Khatami
      Machine learning has strong potential as a tool for understanding how to classify phases in condensed matter physics. A new investigation shows that an artificial neural network can be trained to identify changes in the collective magnetic properties of electrons on a lattice and predict trends in the transition when some of the electrons are removed.
      [Phys. Rev. X 7, 031038] Published Wed Aug 30, 2017
      Citation: Phys. Rev. X 7, 031038 (2017)
      PubDate: 2017-08-30T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031038
      Issue No: Vol. 7, No. 3 (2017)
       
  • Topological Sound and Flocking on Curved Surfaces

    • Authors: Suraj Shankar; Mark J. Bowick, M. Cristina Marchetti
      First page: 031039
      Abstract: Author(s): Suraj Shankar, Mark J. Bowick, and M. Cristina Marchetti
      A flocking model that describes birds and cells exhibits topological features when the moving entities are confined to a curved surface.
      [Phys. Rev. X 7, 031039] Published Thu Sep 07, 2017
      Citation: Phys. Rev. X 7, 031039 (2017)
      PubDate: 2017-09-07T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031039
      Issue No: Vol. 7, No. 3 (2017)
       
  • Deterministic Enhancement of Coherent Photon Generation from a
           Nitrogen-Vacancy Center in Ultrapure Diamond

    • Authors: Daniel Riedel; Immo Söllner, Brendan J. Shields, Sebastian Starosielec, Patrick Appel, Elke Neu, Patrick Maletinsky, Richard J. Warburton
      First page: 031040
      Abstract: Author(s): Daniel Riedel, Immo Söllner, Brendan J. Shields, Sebastian Starosielec, Patrick Appel, Elke Neu, Patrick Maletinsky, and Richard J. Warburton
      Nitrogen-vacancy centers—a type of atom-sized defect in diamonds—have potential for use as quantum bits in quantum information technologies. However, low rates of entanglement between the defect spin and the photons they produce hamper the mediation of long-distance connections. A new experiment shows a way around this limitation by employing a tunable, miniaturized Fabry-Pérot microcavity.
      [Phys. Rev. X 7, 031040] Published Thu Sep 07, 2017
      Citation: Phys. Rev. X 7, 031040 (2017)
      PubDate: 2017-09-07T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.031040
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Image Processing and Its Application to Edge Detection: Theory and
           Experiment

    • Authors: Xi-Wei Yao; Hengyan Wang, Zeyang Liao, Ming-Cheng Chen, Jian Pan, Jun Li, Kechao Zhang, Xingcheng Lin, Zhehui Wang, Zhihuang Luo, Wenqiang Zheng, Jianzhong Li, Meisheng Zhao, Xinhua Peng, Dieter Suter
      First page: 031041
      Abstract: Author(s): Xi-Wei Yao, Hengyan Wang, Zeyang Liao, Ming-Cheng Chen, Jian Pan, Jun Li, Kechao Zhang, Xingcheng Lin, Zhehui Wang, Zhihuang Luo, Wenqiang Zheng, Jianzhong Li, Meisheng Zhao, Xinhua Peng, and Dieter Suter
      Analysis of the large amounts of image data requires increasingly expensive and time-consuming computational resources. Quantum computing may offer a shortcut. A new edge-detection algorithm based on a specific quantum image representation shows exponentially faster performance compared to classical methods.
      [Phys. Rev. X 7, 031041] Published Mon Sep 11, 2017
      Citation: Phys. Rev. X 7, 031041 (2017)
      PubDate: 2017-09-11T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031041
      Issue No: Vol. 7, No. 3 (2017)
       
  • Anisotropy of the Seebeck Coefficient in the Cuprate Superconductor
           ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{y}$: Fermi-Surface
           Reconstruction by Bidirectional Charge Order

    • Authors: O. Cyr-Choinière; S. Badoux, G. Grissonnanche, B. Michon, S. A. A. Afshar, S. Fortier, D. LeBoeuf, D. Graf, J. Day, D. A. Bonn, W. N. Hardy, R. Liang, N. Doiron-Leyraud, Louis Taillefer
      First page: 031042
      Abstract: Author(s): O. Cyr-Choinière, S. Badoux, G. Grissonnanche, B. Michon, S. A. A. Afshar, S. Fortier, D. LeBoeuf, D. Graf, J. Day, D. A. Bonn, W. N. Hardy, R. Liang, N. Doiron-Leyraud, and Louis Taillefer
      Reconstruction of the Fermi surface in the cuprate YBa2Cu3Oy is thought to be caused by one of two types of charge-density waves. Identifying which one is responsible could help researchers understand the high-temperature superconductivity that cuprates exhibit. New experiments show that short-range two-dimensional waves lead to Fermi surface reconstruction.
      [Phys. Rev. X 7, 031042] Published Tue Sep 12, 2017
      Citation: Phys. Rev. X 7, 031042 (2017)
      PubDate: 2017-09-12T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031042
      Issue No: Vol. 7, No. 3 (2017)
       
  • Berry Curvature and Nonlocal Transport Characteristics of Antidot Graphene

    • Authors: Jie Pan; Ting Zhang, Haijing Zhang, Bing Zhang, Zhen Dong, Ping Sheng
      First page: 031043
      Abstract: Author(s): Jie Pan, Ting Zhang, Haijing Zhang, Bing Zhang, Zhen Dong, and Ping Sheng
      Antidot graphene, a sheet of carbon atoms with carefully arranged patterns of holes, has electronic properties that differ from pristine graphene. One way to quantify this difference is with a mathematical quantity called Berry curvature. A new analysis shows that antidot graphene has nonzero curvature, which leads to interesting electron behavior.
      [Phys. Rev. X 7, 031043] Published Tue Sep 12, 2017
      Citation: Phys. Rev. X 7, 031043 (2017)
      PubDate: 2017-09-12T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031043
      Issue No: Vol. 7, No. 3 (2017)
       
  • Squeezed Thermal Reservoirs as a Resource for a Nanomechanical Engine
           beyond the Carnot Limit

    • Authors: Jan Klaers; Stefan Faelt, Atac Imamoglu, Emre Togan
      First page: 031044
      Abstract: Author(s): Jan Klaers, Stefan Faelt, Atac Imamoglu, and Emre Togan
      A tiny engine can surpass the Carnot limit of efficiency when researchers engineer the thermal properties of the environment.
      [Phys. Rev. X 7, 031044] Published Wed Sep 13, 2017
      Citation: Phys. Rev. X 7, 031044 (2017)
      PubDate: 2017-09-13T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031044
      Issue No: Vol. 7, No. 3 (2017)
       
  • Noise Gated by Dendrosomatic Interactions Increases Information
           Transmission

    • Authors: Richard Naud; Alexandre Payeur, André Longtin
      First page: 031045
      Abstract: Author(s): Richard Naud, Alexandre Payeur, and André Longtin
      Brains process information reliably despite the presence of noise introduced by their molecular machinery. New computer simulations of neurons show that these cells might use noise to their advantage by employing dendrites to detect low-intensity signals and using the main cell body to process more powerful signals.
      [Phys. Rev. X 7, 031045] Published Wed Sep 13, 2017
      Citation: Phys. Rev. X 7, 031045 (2017)
      PubDate: 2017-09-13T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031045
      Issue No: Vol. 7, No. 3 (2017)
       
  • Flat Engineered Multichannel Reflectors

    • Authors: V. S. Asadchy; A. Díaz-Rubio, S. N. Tcvetkova, D.-H. Kwon, A. Elsakka, M. Albooyeh, S. A. Tretyakov
      First page: 031046
      Abstract: Author(s): V. S. Asadchy, A. Díaz-Rubio, S. N. Tcvetkova, D.-H. Kwon, A. Elsakka, M. Albooyeh, and S. A. Tretyakov
      Diffractive optical components play a huge role in many applications, but they only work optimally when incident radiation hits them at a specific preordained angle. A new concept known as a multichannel metasurfaces, however, promises to control light coming and going from multiple directions at the same time, opening up intriguing possibilities for a range of novel optical devices.
      [Phys. Rev. X 7, 031046] Published Thu Sep 14, 2017
      Citation: Phys. Rev. X 7, 031046 (2017)
      PubDate: 2017-09-14T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031046
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Butterfly Effect in Weakly Interacting Diffusive Metals

    • Authors: Aavishkar A. Patel; Debanjan Chowdhury, Subir Sachdev, Brian Swingle
      First page: 031047
      Abstract: Author(s): Aavishkar A. Patel, Debanjan Chowdhury, Subir Sachdev, and Brian Swingle
      Chaos in quantum systems of many interacting particles leads to information scrambling, which underlies diverse fields from black holes to entanglement production. A new analysis determines a fundamental speed at which information spreads in a common example of a quantum many-body system, which could lead to broader insights into information dynamics.
      [Phys. Rev. X 7, 031047] Published Thu Sep 14, 2017
      Citation: Phys. Rev. X 7, 031047 (2017)
      PubDate: 2017-09-14T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031047
      Issue No: Vol. 7, No. 3 (2017)
       
  • Combining Topological Hardware and Topological Software: Color-Code
           Quantum Computing with Topological Superconductor Networks

    • Authors: Daniel Litinski; Markus S. Kesselring, Jens Eisert, Felix von Oppen
      First page: 031048
      Abstract: Author(s): Daniel Litinski, Markus S. Kesselring, Jens Eisert, and Felix von Oppen
      Preserving the delicate states that store information in a quantum computer when dealing with a noisy environment is a considerable challenge, and many researchers are turning to hardware- and software-based topological protection as a solution. A new paradigm based on error-correcting color codes combines the advantages of both hardware and software and enables a scalable approach to fault-tolerant quantum computing.
      [Phys. Rev. X 7, 031048] Published Fri Sep 15, 2017
      Citation: Phys. Rev. X 7, 031048 (2017)
      PubDate: 2017-09-15T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031048
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Spin Lenses in Atomic Arrays

    • Authors: A. W. Glaetzle; K. Ender, D. S. Wild, S. Choi, H. Pichler, M. D. Lukin, P. Zoller
      First page: 031049
      Abstract: Author(s): A. W. Glaetzle, K. Ender, D. S. Wild, S. Choi, H. Pichler, M. D. Lukin, and P. Zoller
      In quantum computing, atomic ensembles can efficiently map “flying” photonic qubits onto stationary qubits. These absorbed photons, however, end up encoded in delocalized states that preclude local processing. A new concept called a “quantum spin lens” could focus delocalized excitations onto a single atom, which can then be manipulated using standard quantum computing tools.
      [Phys. Rev. X 7, 031049] Published Wed Sep 20, 2017
      Citation: Phys. Rev. X 7, 031049 (2017)
      PubDate: 2017-09-20T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031049
      Issue No: Vol. 7, No. 3 (2017)
       
  • Entanglement-Based dc Magnetometry with Separated Ions

    • Authors: T. Ruster; H. Kaufmann, M. A. Luda, V. Kaushal, C. T. Schmiegelow, F. Schmidt-Kaler, U. G. Poschinger
      First page: 031050
      Abstract: Author(s): T. Ruster, H. Kaufmann, M. A. Luda, V. Kaushal, C. T. Schmiegelow, F. Schmidt-Kaler, and U. G. Poschinger
      Magnetometers based on the spins of single electrons offer a way to precisely characterize magnetic fields at microscopic scales but are highly sensitive to noisy environments. New experiments show a way to build a more robust single-spin magnetometer using entangled calcium ions.
      [Phys. Rev. X 7, 031050] Published Thu Sep 21, 2017
      Citation: Phys. Rev. X 7, 031050 (2017)
      PubDate: 2017-09-21T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031050
      Issue No: Vol. 7, No. 3 (2017)
       
  • Deconfined Quantum Critical Points: Symmetries and Dualities

    • Authors: Chong Wang; Adam Nahum, Max A. Metlitski, Cenke Xu, T. Senthil
      First page: 031051
      Abstract: Author(s): Chong Wang, Adam Nahum, Max A. Metlitski, Cenke Xu, and T. Senthil
      Different theories can be used to describe the same behavior in quantum matter, a concept known as duality. A new analysis uses duality to connect ideas in quantum electrodynamics with a type of quantum magnet known as a deconfined quantum critical point and reveal new properties of both.
      [Phys. Rev. X 7, 031051] Published Fri Sep 22, 2017
      Citation: Phys. Rev. X 7, 031051 (2017)
      PubDate: 2017-09-22T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031051
      Issue No: Vol. 7, No. 3 (2017)
       
  • Duality between the Deconfined Quantum-Critical Point and the Bosonic
           Topological Transition

    • Authors: Yan Qi Qin; Yuan-Yao He, Yi-Zhuang You, Zhong-Yi Lu, Arnab Sen, Anders W. Sandvik, Cenke Xu, Zi Yang Meng
      First page: 031052
      Abstract: Author(s): Yan Qi Qin, Yuan-Yao He, Yi-Zhuang You, Zhong-Yi Lu, Arnab Sen, Anders W. Sandvik, Cenke Xu, and Zi Yang Meng
      Proving an equivalence between two theories—one that describes a transition between two kinds of insulating states and another that models changes between spin states—would offer a step toward a unified theoretical understanding of different condensed-matter systems. New computer simulations provide evidence for this duality by showing that the critical points of these two theories have identical properties.
      [Phys. Rev. X 7, 031052] Published Fri Sep 22, 2017
      Citation: Phys. Rev. X 7, 031052 (2017)
      PubDate: 2017-09-22T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031052
      Issue No: Vol. 7, No. 3 (2017)
       
  • Polaron-Driven Surface Reconstructions

    • Authors: Michele Reticcioli; Martin Setvin, Xianfeng Hao, Peter Flauger, Georg Kresse, Michael Schmid, Ulrike Diebold, Cesare Franchini
      First page: 031053
      Abstract: Author(s): Michele Reticcioli, Martin Setvin, Xianfeng Hao, Peter Flauger, Georg Kresse, Michael Schmid, Ulrike Diebold, and Cesare Franchini
      Surface reconstructions in cleaved crystals are generally thought to be driven by charge transfer between surface atoms. New calculations and experiments with rutile titanium dioxide exhibit a radically different mechanism based on charge trapping, which could open up novel ways of designing crystal surfaces for a range of applications.
      [Phys. Rev. X 7, 031053] Published Mon Sep 25, 2017
      Citation: Phys. Rev. X 7, 031053 (2017)
      PubDate: 2017-09-25T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031053
      Issue No: Vol. 7, No. 3 (2017)
       
  • Bulk Rotational Symmetry Breaking in Kondo Insulator ${\mathrm{SmB}}_{6}$

    • Authors: Z. Xiang; B. Lawson, T. Asaba, C. Tinsman, Lu Chen, C. Shang, X. H. Chen, Lu Li
      First page: 031054
      Abstract: Author(s): Z. Xiang, B. Lawson, T. Asaba, C. Tinsman, Lu Chen, C. Shang, X. H. Chen, and Lu Li
      Kondo insulators exhibit strong electronic interactions and topological protection, making them a good platform for studying connections between these two fields. New experiments show that a type of magnetic oscillation (the de Hass-van Alphen effect) originates in the surface of a Kondo insulator, bolstering evidence for topologically protected surface states.
      [Phys. Rev. X 7, 031054] Published Mon Sep 25, 2017
      Citation: Phys. Rev. X 7, 031054 (2017)
      PubDate: 2017-09-25T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031054
      Issue No: Vol. 7, No. 3 (2017)
       
  • Quantum Correlations of Light from a Room-Temperature Mechanical
           Oscillator

    • Authors: V. Sudhir; R. Schilling, S. A. Fedorov, H. Schütz, D. J. Wilson, T. J. Kippenberg
      First page: 031055
      Abstract: Author(s): V. Sudhir, R. Schilling, S. A. Fedorov, H. Schütz, D. J. Wilson, and T. J. Kippenberg
      When light reflects off a mirror, its intensity and phase become quantum correlated as a result of radiation pressure. These correlations could be used to erase quantum backaction, which poses a fundamental limit to the precision of interferometric displacement measurements. For the first time, these correlations are observed and exploited in a room-temperature interferometer, which could lead to advances in quantum-enhanced metrology.
      [Phys. Rev. X 7, 031055] Published Tue Sep 26, 2017
      Citation: Phys. Rev. X 7, 031055 (2017)
      PubDate: 2017-09-26T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031055
      Issue No: Vol. 7, No. 3 (2017)
       
  • Super-Resolution Community Detection for Layer-Aggregated Multilayer
           Networks

    • Authors: Dane Taylor; Rajmonda S. Caceres, Peter J. Mucha
      First page: 031056
      Abstract: Author(s): Dane Taylor, Rajmonda S. Caceres, and Peter J. Mucha
      Detecting anomalous clusters within networks is vital to cybersecurity in detecting attacks and intrusions, but such analysis is typically ad hoc with no overarching, unifying methodology. A new analysis shows how layer aggregation can be used in a variety of time-varying networks as a filter for preprocessing data to allow the detection of communities that would otherwise go unnoticed.
      [Phys. Rev. X 7, 031056] Published Tue Sep 26, 2017
      Citation: Phys. Rev. X 7, 031056 (2017)
      PubDate: 2017-09-26T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031056
      Issue No: Vol. 7, No. 3 (2017)
       
  • Exploring Interacting Topological Insulators with Ultracold Atoms: The
           Synthetic Creutz-Hubbard Model

    • Authors: J. Jünemann; A. Piga, S.-J. Ran, M. Lewenstein, M. Rizzi, A. Bermudez
      First page: 031057
      Abstract: Author(s): J. Jünemann, A. Piga, S.-J. Ran, M. Lewenstein, M. Rizzi, and A. Bermudez
      Understanding the behavior of topological phases of matter in the presence of strong interactions and correlations is one of the big challenges in modern physics. New theoretical work analyzes a potential platform for addressing these challenges and proposes how it might be implemented in a one-dimensional optical lattice.
      [Phys. Rev. X 7, 031057] Published Wed Sep 27, 2017
      Citation: Phys. Rev. X 7, 031057 (2017)
      PubDate: 2017-09-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031057
      Issue No: Vol. 7, No. 3 (2017)
       
  • Non-Fermi Liquid at ($2+1$)$\mathrm{D}$ Ferromagnetic Quantum Critical
           Point

    • Authors: Xiao Yan Xu; Kai Sun, Yoni Schattner, Erez Berg, Zi Yang Meng
      First page: 031058
      Abstract: Author(s): Xiao Yan Xu, Kai Sun, Yoni Schattner, Erez Berg, and Zi Yang Meng
      The behavior of electrons near quantum critical points, such as magnetic phase transitions at temperatures approaching absolute zero, are of vital interest but are extremely challenging to understand. New computer simulations solve this problem, exactly, for one example of these strange metals and reveal a new type of quantum critical point.
      [Phys. Rev. X 7, 031058] Published Wed Sep 27, 2017
      Citation: Phys. Rev. X 7, 031058 (2017)
      PubDate: 2017-09-27T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031058
      Issue No: Vol. 7, No. 3 (2017)
       
  • Towards the Solution of the Many-Electron Problem in Real Materials:
           Equation of State of the Hydrogen Chain with State-of-the-Art Many-Body
           Methods

    • Authors: Mario Motta; David M. Ceperley, Garnet Kin-Lic Chan, John A. Gomez, Emanuel Gull, Sheng Guo, Carlos A. Jiménez-Hoyos, Tran Nguyen Lan, Jia Li, Fengjie Ma, Andrew J. Millis, Nikolay V. Prokof’ev, Ushnish Ray, Gustavo E. Scuseria, Sandro Sorella, Edwin M. Stoudenmire, Qiming Sun, Igor S. Tupitsyn, Steven R. White, Dominika Zgid, Shiwei Zhang (Simons Collaboration on the Many-Electron Problem)
      First page: 031059
      Abstract: Author(s): Mario Motta, David M. Ceperley, Garnet Kin-Lic Chan, John A. Gomez, Emanuel Gull, Sheng Guo, Carlos A. Jiménez-Hoyos, Tran Nguyen Lan, Jia Li, Fengjie Ma, Andrew J. Millis, Nikolay V. Prokof’ev, Ushnish Ray, Gustavo E. Scuseria, Sandro Sorella, Edwin M. Stoudenmire, Qiming Sun, Igor S. Tupitsyn, Steven R. White, Dominika Zgid, and Shiwei Zhang (Simons Collaboration on the Many-Electron Problem)
      Understanding the collective behavior of many interacting electrons is a key challenge in fundamental physics and materials design. A benchmark study characterizes the accuracy and abilities of 16 methods for many-electron computations and applies these insights to determining the equation of state for an infinite chain of hydrogen atoms.
      [Phys. Rev. X 7, 031059] Published Thu Sep 28, 2017
      Citation: Phys. Rev. X 7, 031059 (2017)
      PubDate: 2017-09-28T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031059
      Issue No: Vol. 7, No. 3 (2017)
       
  • Variational Identification of Markovian Transition States

    • Authors: Linda Martini; Adam Kells, Roberto Covino, Gerhard Hummer, Nicolae-Viorel Buchete, Edina Rosta
      First page: 031060
      Abstract: Author(s): Linda Martini, Adam Kells, Roberto Covino, Gerhard Hummer, Nicolae-Viorel Buchete, and Edina Rosta
      A new method for identifying and analyzing Markov states from molecular dynamics trajectories offers a novel and simple approach to analyzing the complex behavior in molecular processes, such as those seen in biological systems.
      [Phys. Rev. X 7, 031060] Published Thu Sep 28, 2017
      Citation: Phys. Rev. X 7, 031060 (2017)
      PubDate: 2017-09-28T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031060
      Issue No: Vol. 7, No. 3 (2017)
       
  • Localization and Symmetry Breaking in the Quantum Quasiperiodic Ising
           Glass

    • Authors: A. Chandran; C. R. Laumann
      First page: 031061
      Abstract: Author(s): A. Chandran and C. R. Laumann
      In disordered quantum systems, magnetic domains might be localized, indefinitely preserving their initial states. A theoretical analysis shows that disorder is not necessary for protecting this order and can be accomplished via quasiperiodic modulations.
      [Phys. Rev. X 7, 031061] Published Fri Sep 29, 2017
      Citation: Phys. Rev. X 7, 031061 (2017)
      PubDate: 2017-09-29T10:00:00+00:00
      DOI: 10.1103/PhysRevX.7.031061
      Issue No: Vol. 7, No. 3 (2017)
       
  • Erratum: Ultralow-Noise SiN Trampoline Resonators for Sensing and
           Optomechanics [Phys. Rev. X 6, 021001 (2016)]

    • Authors: Christoph Reinhardt; Tina Müller, Alexandre Bourassa, Jack C. Sankey
      First page: 039901
      Abstract: Author(s): Christoph Reinhardt, Tina Müller, Alexandre Bourassa, and Jack C. Sankey
      [Phys. Rev. X 7, 039901] Published Mon Aug 07, 2017
      Citation: Phys. Rev. X 7, 039901 (2017)
      PubDate: 2017-08-07T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.039901
      Issue No: Vol. 7, No. 3 (2017)
       
  • Efficient Variational Quantum Simulator Incorporating Active Error
           Minimization

    • Authors: Ying Li; Simon C. Benjamin
      First page: 021050
      Abstract: Author(s): Ying Li and Simon C. Benjamin
      Quantum computers will need to be tolerant to errors introduced by noise, but current proposals estimate that the number of qubits required for error correction will be many orders of magnitude larger than the number needed for useful computation. A new proposal uses a classical-quantum hybrid scheme to implement simple error-tolerant quantum processors with relatively few resources.
      [Phys. Rev. X 7, 021050] Published Thu Jun 29, 2017
      Citation: Phys. Rev. X 7, 021050 (2017)
      PubDate: 2017-06-29T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.021050
      Issue No: Vol. 7, No. 2 (2017)
       
  • Experiments in Stochastic Thermodynamics: Short History and Perspectives

    • Authors: S. Ciliberto
      First page: 021051
      Abstract: Author(s): S. Ciliberto
      Stochastic thermodynamics extends the traditional laws of thermodynamics to microscopic systems where thermal and quantum fluctuations cannot be ignored. This review summarizes progress in this field with a look at several experimental and theoretical results and a look toward potential applications in biology and nanotechnology.
      [Phys. Rev. X 7, 021051] Published Fri Jun 30, 2017
      Citation: Phys. Rev. X 7, 021051 (2017)
      PubDate: 2017-06-30T10:00:00-04:00
      DOI: 10.1103/PhysRevX.7.021051
      Issue No: Vol. 7, No. 2 (2017)
       
 
 
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