Relaxation Dynamics in the Energy Landscape of Glass-Forming Liquids Yoshihiko Nishikawa, Misaki Ozawa, Atsushi Ikeda, Pinaki Chaudhuri, and Ludovic Berthier Phys. Rev. X 12, 021001 (2022) – Published 1 April 2022 Computer simulations of many models of glass-forming liquids fully characterize how they relax into energy minima in a rugged energy landscape. Show Abstract Chemical Physics Computational Physics Statistical Physics PDFHTML Magnifying Quantum Phase Fluctuations with Cooper-Pair Pairing W. C. Smith, M. Villiers, A. Marquet, J. Palomo, M. R. Delbecq, T. Kontos, P. Campagne-Ibarcq, B. Douçot, and Z. Leghtas Phys. Rev. X 12, 021002 (2022) – Published 4 April 2022 Forcing electrons to group together in ensembles of four—a pair of Cooper pairs—protects their collective quantum state from external perturbations, which provides a way to robustly encode quantum information. Show Abstract Mesoscopics Quantum Physics Quantum Information PDFHTML Highly Tunable Magnetic Phases in Transition-Metal Dichalcogenide Fe 1 / 3 + δ NbS 2 Shan Wu, Zhijun Xu, Shannon C. Haley, Sophie F. Weber, Arani Acharya, Eran Maniv, Yiming Qiu, A. A. Aczel, Nicholas S. Settineri, Jeffrey B. Neaton, James G. Analytis, and Robert J. Birgeneau Phys. Rev. X 12, 021003 (2022) – Published 5 April 2022 A change in magnetic moment configurations as a function of iron ratio in Fe 1 / 3 + δ NbS 2 underlies its current-induced resistance switching, a key insight for using this and similar materials in future spintronic devices. Show Abstract Condensed Matter Physics Magnetism PDFHTML Extended Poisson-Kac Theory: A Unifying Framework for Stochastic Processes with Finite Propagation Velocity Massimiliano Giona, Andrea Cairoli, and Rainer Klages Phys. Rev. X 12, 021004 (2022) – Published 6 April 2022 A novel framework for modeling complex systems using stochastic methods solves the problem of generating unphysical, infinitely large fluctuations, which plagues conventional methods. Show Abstract Statistical Physics PDFHTML Neutral Bremsstrahlung Emission in Xenon Unveiled C. A. O. Henriques et al. (NEXT Collaboration) Phys. Rev. X 12, 021005 (2022) – Published 7 April 2022 The scattering of electrons onto neutral atoms in xenon gas gives rise to a new type of light emission that will impact the sensitivity of dark matter searches and neutrino detectors. Show Abstract Astrophysics Particles and Fields PDFHTML Featured in Physics Emission of Photon Multiplets by a dc-Biased Superconducting Circuit G. C. Ménard, A. Peugeot, C. Padurariu, C. Rolland, B. Kubala, Y. Mukharsky, Z. Iftikhar, C. Altimiras, P. Roche, H. le Sueur, P. Joyez, D. Vion, D. Esteve, J. Ankerhold, and F. Portier Phys. Rev. X 12, 021006 (2022) – Published 8 April 2022 Physics logo Focus: Multiphoton Generator on a Chip An electrical circuit tailored to exhibit a strong charge-light coupling demonstrates a greater efficiency of emitting several photons at once, thus providing a versatile testbed for many aspects of quantum physics. Show Abstract Mesoscopics Quantum Physics Superconductivity PDFHTML Incoherent Branched Flow of Light Anatoly Patsyk, Yonatan Sharabi, Uri Sivan, and Mordechai Segev Phys. Rev. X 12, 021007 (2022) – Published 11 April 2022 To date, only coherent waves have been used to study branched flow in experiments, where waves follow branching paths in a disordered medium. The first experimental study with incoherent waves shows qualitative differences. Show Abstract Optics Photonics PDFHTML Very-High-Energy Collective States of Partons in Fractional Quantum Hall Liquids Ajit C. Balram, Zhao Liu, Andrey Gromov, and Zlatko Papić Phys. Rev. X 12, 021008 (2022) – Published 12 April 2022 At very high energies, an exotic state of matter known as a fractional quantum Hall liquid may produce a new type of quasiparticle called a parton, which behaves like a fraction of an electron. Show Abstract Condensed Matter Physics Semiconductor Physics Strongly Correlated Materials PDFHTML Hydrodynamic Theory of the Connected Spectral form Factor Michael Winer and Brian Swingle Phys. Rev. X 12, 021009 (2022) – Published 13 April 2022 The spectral form factor is powerful tool for characterizing spectral statistics that relate to big picture properties of a system. A new analysis provides new tools for calculating this quantity. Show Abstract Condensed Matter Physics Quantum Physics Statistical Physics PDFHTML Roller Coaster in a Flatland: Magnetoresistivity in Eu-Intercalated Graphite A. L. Chernyshev and O. A. Starykh Phys. Rev. X 12, 021010 (2022) – Published 14 April 2022 The resistivity of the graphite compound EuC 6 has an unusual highly nonmonotonic dependence on magnetic field. A theoretical study explains this behavior as arising from electrons scattering on magnons. Show Abstract Condensed Matter Physics Magnetism Strongly Correlated Materials PDFHTML Quantum Error Correction Thresholds for the Universal Fibonacci Turaev-Viro Code Alexis Schotte, Guanyu Zhu, Lander Burgelman, and Frank Verstraete Phys. Rev. X 12, 021012 (2022) – Published 15 April 2022 Quantum error correcting codes are key to guarding against errors in quantum computation. A new analysis provides the first performance estimates for one type of these codes. Show Abstract Quantum Physics Quantum Information Strongly Correlated Materials PDFHTML Characterizing Symmetry-Protected Thermal Equilibrium by Work Extraction Yosuke Mitsuhashi, Kazuya Kaneko, and Takahiro Sagawa Phys. Rev. X 12, 021013 (2022) – Published 18 April 2022 An analysis of the thermodynamics of quantum systems establishes a generalized notion of thermal equilibrium, applicable to ensembles that obey certain symmetries. Show Abstract Quantum Information Statistical Physics PDFHTML Formation of Spontaneous Density-Wave Patterns in dc Driven Lattices H. P. Zahn, V. P. Singh, M. N. Kosch, L. Asteria, L. Freystatzky, K. Sengstock, L. Mathey, and C. Weitenberg Phys. Rev. X 12, 021014 (2022) – Published 19 April 2022 Strongly tilting a Bose-Einstein condensate in a triangular lattice of ultracold atoms induces the formation of pronounced density waves, which provide a prime example of spontaneous symmetry breaking. Show Abstract Atomic and Molecular Physics Nonlinear Dynamics Quantum Physics PDFHTML Case for a U ( 1 ) π Quantum Spin Liquid Ground State in the Dipole-Octupole Pyrochlore Ce 2 Zr 2 O 7 E. M. Smith, O. Benton, D. R. Yahne, B. Placke, R. Schäfer, J. Gaudet, J. Dudemaine, A. Fitterman, J. Beare, A. R. Wildes, S. Bhattacharya, T. DeLazzer, C. R. C. Buhariwalla, N. P. Butch, R. Movshovich, J. D. Garrett, C. A. Marjerrison, J. P. Clancy, E. Kermarrec, G. M. Luke, A. D. Bianchi, K. A. Ross, and B. D. Gaulin Phys. Rev. X 12, 021015 (2022) – Published 20 April 2022 By measuring how Ce 3 + spins interact in Ce 2 Zr 2 O 7 , new experimental work lays out a detailed case for a novel quantum spin liquid phase at low temperature in this material. Show Abstract Condensed Matter Physics Magnetism Strongly Correlated Materials PDFHTML Spin-Group Symmetry in Magnetic Materials with Negligible Spin-Orbit Coupling Pengfei Liu, Jiayu Li, Jingzhi Han, Xiangang Wan, and Qihang Liu Phys. Rev. X 12, 021016 (2022) – Published 21 April 2022 A theoretical analysis of nonrelativistic magnetic materials applies a symmetry description beyond magnetic groups to explore material properties and reveal new topological phases. Show Abstract