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Skip to Main Content Journals Physical Review Letters Physical Review X PRX Quantum Reviews of Modern Physics Physical Review A Physical Review C Physical Review D Physical Review E Physical Review Research Physical Review Accelerators and Beams Physical Review Applied Physical Review Fluids Physical Review Materials Physical Review Physics Education Research Physical Review Physical Review (Series I) Physics Physique Fizika Physics Magazine Help/Feedback Search/Article Lookup Log in Learn about our response to COVID-19 , including freely available research and expanded remote access support. covering condensed matter and materials physics Highlights Recent Accepted Authors Referees Search Press About Staff APS and the Physical Review Editorial Office Continue to Support Researchers COVID-19 has impacted many institutions and organizations around the world, disrupting the progress of research. Through this difficult time APS and the Physical Review editorial office are fully equipped and actively working to support researchers by continuing to carry out all editorial and peer-review functions and publish research in the journals as well as minimizing disruption to journal access. We appreciate your continued effort and commitment to helping advance science, and allowing us to publish the best physics journals in the world. And we hope you, and your loved ones, are staying safe and healthy. Ways to Access APS Journal Articles Off-Campus Many researchers now find themselves working away from their institutions and, thus, may have trouble accessing the Physical Review journals. To address this, we have been improving access via several different mechanisms. See Off-Campus Access to Physical Review for further instructions. Introducing PRX Quantum , a new Physical Review journal Opening for submissions mid-2020, PRX Quantum will be a highly selective, open access journal featuring quantum information science and technology research with an emphasis on lasting and profound impact. The journal expands on the excellence and innovation of Physical Review X (PRX). 50 th Anniversary Milestones The year 2020 marks PRB’s 50 th anniversary. On this occasion, the editors launch a collection of select papers. These Milestone studies represent lasting contributions to physics by way of reporting significant discoveries, initiating new areas of research, or substantially enhancing the conceptual tools for making progress in the burgeoning field of condensed matter physics. Collection MILESTONE Boson localization and the superfluid-insulator transition Helium-4 confined in disordered restricted geometries such as porous media exhibits a new intermediate phase between Mott insulator and superfluid. Matthew P. A. Fisher, Peter B. Weichman, G. Grinstein, and Daniel S. Fisher Phys. Rev. B 40 , 546 (1989) Collection EDITORS' SUGGESTION Thermoelectric power of Sachdev-Ye-Kitaev islands: Probing Bekenstein-Hawking entropy in quantum matter experiments One of the remarkable properties of the Sachdev-Ye-Kitaev model of randomly interacting electrons is that it has a nonvanishing extensive entropy in the limit of zero temperature. In its dual representation as the low energy theory of a charged black hole, this entropy is the Bekenstein-Hawking black hole entropy. This work shows how the entropy can be measured by thermoelectric probes of mesoscopic electronic realizations of Sachdev-Ye-Kitaev models. Alexander Kruchkov, Aavishkar A. Patel, Philip Kim, and Subir Sachdev Phys. Rev. B 101 , 205148 (2020) EDITORS' SUGGESTION Long spin coherence times in the ground state and in an optically excited state of Er 3 + 167 : Y 2 SiO 5 at zero magnetic field Although superconducting qubits are one of the most promising systems for quantum information applications, a separate interface is required to allow for information distribution through optical links. Here, the authors investigate the suitability of 167 Er 3 + :Y 2 SiO 5 as a microwave-to-optical memory interface. This material holds considerable promise as it has an optical transition in the telecommunication band. The authors identify hyperfine transitions with long coherence times without an external magnetic field, which are suitable for interfacing with superconducting qubit systems. Jelena V. Rakonjac, Yu-Hui Chen, Sebastian P. Horvath, and Jevon J. Longdell Phys. Rev. B 101 , 184430 (2020) MILESTONE Interpretation of Raman spectra of disordered and amorphous carbon A general three-stage model relates Raman spectroscopy in the visible range to the content of disordered carbons for all amorphous carbons, whether hydrogenated or hydrogen-free. A. C. Ferrari and J. Robertson Phys. Rev. B 61 , 14095 (2000) Collection EDITORS' SUGGESTION Orientation dependence of the magnetic phase diagram of Yb 2 Ti 2 O 7 When interactions support quantum fluctuations in frustrated magnets, one may hope to realize a quantum spin liquid. Here, the authors report a detailed experimental and theoretical study of the low-temperature phase diagram of the pyrochlore quantum magnet Yb 2 Ti 2 O 7 . Despite the geometric frustration associated with this structure, the material exhibits anisotropic ferromagnetism at low temperatures. The reentrant phase diagram and the reversed anisotropy of the upper critical field reported here are, however, inconsistent with a classical description and indicate that the reentrant low-field regime is driven by quantum fluctuations. S. Säubert et al. Phys. Rev. B 101 , 174434 (2020) EDITORS' SUGGESTION Electromagnetic coupling in tight-binding models for strongly correlated light and matter The rapidly developing collaboration of condensed matter and quantum optical physics opens up exciting new possibilities for creating novel photon-matter states that allow manipulating material properties using optical cavities. This paper addresses the important challenge of formulating consistent, accurate, and convenient forms of the light-matter coupling for the low-energy tight-binding-type models useful for theoretical analysis. It achieves this by constructing precise mappings from the fundamental a b i n i t i o description of the cavity-matter system to low-energy theories, producing a truncated Hamiltonian coupling to a quantum Peierls phase. In a simple model system, the authors demonstrate the quick convergence of the truncated Hamiltonian with the number of bands, paving the way for rigorous theoretical studies in this emerging research field. Jiajun Li et al. Phys. Rev. B 101 , 205140 (2020) EDITORS' SUGGESTION Non-Abelian topology of nodal-line rings in PT -symmetric systems The paradigm of topological band theory has been recently challenged by the discovery of band nodes with non-Abelian topological charges. Here, the authors simplify the description of the non-Abelian topology using elementary geometric rules, and they use them to prove a relation between the monopole charge and the linking structure of nodal-line rings. Furthermore, they establish a novel braiding phenomenon induced by topological interaction of the monopole charge with the Berry phase. The analysis suggests unexpected richness of topological structures in P T -symmetric systems. Apoorv Tiwari and Tomáš Bzdušek Phys. Rev. B 101 , 195130 (2020) EDITORS' SUGGESTION Unified structure for exact towers of scar states in the Affleck-Kennedy-Lieb-Tasaki and other models Exact “towers” of quantum many-body scar states are recently discovered sets of states in some many-body nonintegrable systems. They are evenly spaced in energy and do not obey the eigenstate thermalization hypothesis. Here, the authors provide a unified framework of proving several towers of states known in the literature. This sheds light on the general structure of exact scar towers, and on the specific models themselves: the 1D AKLT models, spin-1 XY model, and a spin-½ domain wall conserving model. In particular, they provide a simple proof for the scars in the AKLT models and discover...