At the beginning of 2021, eight Physical Review journals began publishing Letters which are intended for the accelerated publication of important new results targeted to the specific readership of each journal.  The authors explore a class of random tensor network models with stabilizer local tensors and study the entanglement phase transitions in these models. They find that an entanglement phase transition can be induced by randomly breaking bulk tensor legs and they extract a set of universal data characterizing the conformal invariance at the critical points. The results clearly demonstrate regimes where a geometric bond percolation picture does or does not apply at the transitions. This work may open new connections to holographic quantum error correcting codes, built from tensor networks. Zhi-Cheng Yang, Yaodong Li, Matthew P. A. Fisher, and Xiao Chen Intrinsic defects and external impurities are unavoidable in solids and play a central role in determining their fundamental physical properties. Unfortunately, most existing defect theories in semiconductors are built on a temperature-independent approximation. By deriving the basic formulas of temperature-dependent defect level evolution, the authors establish two fundamental rules for the temperature dependence of charge-state transition levels in semiconductors, which could be adopted as guidelines for understanding or optimizing doping behavior in semiconductors at finite temperatures. Shuang Qiao et al. Weyl fermions are massless solutions of the Dirac equation, described by two-component complex spinors. Such elusive objects emerge as quasiparticles in the so-called Weyl semimetals (WSM). The authors discuss the generalization of the standard one-component density functional theory to a two-component approach (the spin-current density functional theory) as well as its application to the practical quantum-mechanical description of WSMs through a self-consistent treatment of the spin-orbit coupling and nonlocal Fock exchange. In particular, the authors demonstrate the key role played by spin-current densities in the characterization of Weyl nodes in TaAs. Filippo Bodo, Jacques K. Desmarais, and Alessandro Erba In this combined theoretical and experimental research, the authors investigate the anisotropic magnetic and magnetoelastic properties of the quantum spin-liquid candidate α-RuCl3. They find that the magnetostriction anisotropy is unusually large compared to the anisotropy of the magnetization, which they relate to the strong magnetoelastic Γ’-type coupling. They also observe nonsymmetric anisotropy for magnetic fields canted out of the honeycomb plane in opposite directions, which they relate to the relative orientation of the magnetic field with respect to the RuCl6 octahedra. Vilmos Kocsis et al. In an XX central spin model, a particular spin interacts with a bath of other spins through a term which only couples their XY-plane components. In the presence of an arbitrarily oriented magnetic field, it is shown that certain eigenstates of this model are such that the central spin remains in a pure state, completely disentangled from the bath. Remarkably, this decoupling from the environment becomes possible only when the interaction becomes strong enough. Claude Dimo and Alexandre Faribault Frustrated antiferromagnets can feature a wide variety of noncollinear magnetic ground states. The resulting states have been associated with anomalous transport properties and interesting thermodynamic phenomena. Here, by combining inelastic neutron scattering measurements and density functional theory calculations, the authors investigate the complex ground state of Mn5Si3, its evolution under magnetic field, and its spin excitation spectrum. Furthermore, they model the instability of some Mn magnetic moments in a frustrated environment to unveil their behavior under an external field. This general model can be potentially applied to several frustrated antiferromagnets. N. Biniskos et al. The static and dynamic magnetic properties of Artificial Spin Ices (ASIs) are typically investigated in zero magnetic field. However, magnetic fields can provide a versatile tuning parameter, by driving phase transitions between different magnetic orders, or tuning through regimes where quasiparticle excitations (e.g., “magnetic monopoles”) can readily form and proliferate. Here, using simulations supported by noise experiments, the authors map out the equilibrium thermodynamic properties and magnetic phases of square and quadrupolar ASIs as a function of applied in-plane magnetic fields. M. Goryca et al. The fastest Dirac fermions of 1200 km/s with a nodal loop are discovered here in the superconductor ZrP2−xSex, surpassing the velocity record held by the point-node Dirac fermions in graphene. By using angle-resolved photoemission spectroscopy, the authors demonstrate that nonsymmorphic phosphorous-based square nets provide the hoped-for stage for high Dirac velocity, nodal line, and superconductivity to meet together. This finding should pave the way for future fast and low-loss electronics, and hopefully will lead to discovery of the elusive Majorana fermion. S. Ishizaka et al. Electron-phonon coupling (EPC) is essential for Cooper pairing in conventional superconductors, while its role in high-Tc cuprates is still debated. Exploiting O K-edge resonant inelastic x-ray scattering, the authors reveal here the momentum dependence of EPC strength in two bilayer cuprate families. The strength of EPC decreases with doping at q//=(-0.25, 0) r.l.u., while it has a nonmonotonic trend at smaller momenta. The results provide experimental input to theories invoking a synergistic role for EPC in d-wave pairing. Yingying Peng et al. Phase-space crystal is a solidlike crystalline state in phase space formed by atoms, subject to a time-periodic drive. The authors show that interactions between these atoms can give rise to vibrational band structures with nontrivial Chern numbers and chiral edge states in phase space. Remarkably, these arise even in the presence of time-reversal symmetry in contrast to all topological transport scenarios in real space. Phase-space crystal vibrations offer a new platform for phononic topological transport whereby chiral properties arise naturally. Lingzhen Guo, Vittorio Peano, and Florian Marquardt Polarized neutron scattering images of holmium titanate show how a kagome ice changes topology in a magnetic field. Synopsis on: Here, the author overviews the properties and the internal structure of isolated skyrmions within a cone phase of cubic helimagnets and chiral liquid crystals. The nascent conical state is shown to substantiate the attracting skyrmion-skyrmion interaction, which leads to the formation of skyrmion clusters and/or skyrmions chains. Whereas in bulk helimagnets skyrmion clusters exhibit the hexagonal arrangement of constituent skyrmions, in thin layers skyrmions align into polar skyrmion chains. Such behavior is thickness dependent and depends on the characteristic energy profiles. Andrey O. Leonov Electron-phonon coupling is typically not associated with magnetic order but with either charge density waves (patterns of high and low electron density) or valence-bond solids (patterns of strong and weak electronic bonds). Using quantum Monte Carlo simulations, the authors demonstrate that, within the paradigmatic two-dimensional Su-Schrieffer-Heeger model, the electron-phonon interaction favors antiferromagnetic order in large regions of the phase diagram. A valence-bond solid is observed in the adiabatic regime, while the two phases are connected by an apparently direct phase transition. A. Götz, S. Beyl, M. Hohenadler, and F. F. Assaad APS Editor in Chief, Michael Thoennessen, discusses a new opportunity for communicating authors to include their pronouns together with their contact email in order to promote a more respectful, inclusive, and equitable environment. Vol. 105, Iss. 9-12 — March 2022 View Current IssuesSign up to receive regular email alerts from Physical Review B Sign UpThe American Physical Society (APS) today released the details of its name change policy for the Physical Review journals. The policy is intended to make the world’s leading physics journals more inclusive and ensure authors retain ownership of prior work published under a different name. Opening for submissions later this year, PRX Energy is a new, highly selective open access journal from APS that will communicate and facilitate important advances in energy science and technology for the benefit of humanity. Article publication charges (APCs) will be waived for a limited time. More Announcements Spin-exchange Hamiltonian and topological degeneracies in elemental gadolinium Tunable critical correlations in kagome ice Electron recoil effect in electrically tunable MoSe2 monolayers Doping dependence of the electron-phonon coupling in two families of bilayer superconducting cuprates Valence-bond solid to antiferromagnet transition in the two-dimensional Su-Schrieffer-Heeger model by Langevin dynamics A. Gotz, S. Beyl, M. Hohenadler, and F.F. Assaad Phys. Rev. B 105, 085151 (2022) Large anomalous Hall effect induced by weak ferromagnetism in the noncentrosymmetric antiferromagnet CoNb3S6 Evidence for Dirac nodal-line fermions in a phosphorous square-net superconductor Competition between band topology and non-Hermiticity Weijie Cheng, Xiujuan Zhang, Ming-Hui Lu, and Yan-Feng Chen Phys. Rev. B 105, 094103 (2022) Chiral phonons in lattices with C4 symmetry Optical spectroscopy and ultrafast pump-probe study of a quasi-one-dimensional charge density wave in CuTe Interfacial triferroicity in monolayer chromium dihalide Liu Yang, Yaxin Gao, Menghao Wu, and Puru Jena Phys. Rev. B 105, 094101 (2022) Skyrmion clusters and chains in bulk and thin-layered cubic helimagnets Andrey O. Leonov Phys. Rev. B 105, 094404 (2022) Anomalous Gurzhi effect P.O. Sukhachov and Bjorn Trauzettel Phys. Rev. B 105, 085141 (2022) Magnetic structure and exchange interactions in the Heisenberg pyrochlore antiferromagnet Gd2Pt2O7 |
