Transition-metal dichalcogenide $\mathrm{IrT}{\mathrm{e}}_{2}$ has attracted attention because of its striped lattice, charge ordering, and superconductivity. We have investigated the surface structure of $\mathrm{IrT}{\mathrm{e}}_{2}$, using low-energy electron diffraction and scanning tunneling microscopy. A complex striped lattice modulation as …

[Phys. Rev. B 95, 094118] Published Fri Mar 24, 2017

]]>We report measurements of quantum turbulence generated by a vibrating grid in superfluid ${}^{3}\mathrm{He}$-B at zero pressure in the zero temperature limit. Superfluid flow around individual vortex lines Andreev reflects incoming thermal ballistic quasiparticle excitations, and allows noninvasive detection of qua…

[Phys. Rev. B 95, 094518] Published Fri Mar 24, 2017

]]>We use neutron scattering to study the electron-doped superconducting ${\mathrm{NaFe}}_{0.985}{\mathrm{Co}}_{0.015}\mathrm{As}$ (${T}_{c}=14$ K), which has coexisting static antiferromagnetic (AF) order (${T}_{N}=31$ K) and exhibits two neutron spin resonances (${E}_{r1}\approx 3.5$ meV and ${E}_{r2}\approx 6$ meV) at the in-plane AF ordering wave vector ${\mathbf{Q}}_{\mathrm{AF}}={\mathbf{Q}}_{1}=(1,0)$ in reciproc…

[Phys. Rev. B 95, 094519] Published Fri Mar 24, 2017

]]>We studied the Nb-H system over extended pressure and temperature ranges to establish the highest level of hydrogen abundance we could achieve from the resulting alloy. We probed the Nb-H system with laser heating and x-ray diffraction complemented by numerical density functional theory-based simula…

[Phys. Rev. B 95, 104110] Published Fri Mar 24, 2017

]]>Modern integrated circuits (ICs) employ a myriad of materials organized at nanoscale dimensions, and certain critical tolerances must be met for them to function. To understand departures from intended functionality, it is essential to examine ICs as manufactured so as to adjust design rules ideally…

[Phys. Rev. B 95, 104111] Published Fri Mar 24, 2017

]]>The ground state of the one-dimensional Bose-Hubbard model at unit filling undergoes the Mott-superfluid quantum phase transition. It belongs to the Kosterlitz-Thouless universality class with an exponential divergence of the correlation length in place of the usual power law. We present numerical s…

[Phys. Rev. B 95, 104306] Published Fri Mar 24, 2017

]]>Three-dimensional gauge theories with a discrete gauge group can emerge from spin models as a gapped topological phase with fractional point excitations (gauge charge) and loop excitations (gauge flux). It is known that 3D gauge theories can be “twisted,” in the sense that the gauge flux loops can h…

[Phys. Rev. B 95, 115142] Published Fri Mar 24, 2017

]]>We study magnetic-field-induced critical singularities in the superconducting phase of the hole-doped Hubbard model of repulsively interacting electrons, defined on a two-leg ladder. We argue that, provided the low-energy spin excitations in doped ladders carry electric charge, the low-temperature t…

[Phys. Rev. B 95, 115143] Published Fri Mar 24, 2017

]]>We performed angle-resolved photoemission experiments on Au(111) surface with circularly polarized light. Data were taken with photon energies in the range between 20 and 100 eV in order to investigate the photon energy dependent behavior in the circular dichroism (CD). While the magnitude of the no…

[Phys. Rev. B 95, 115144] Published Fri Mar 24, 2017

]]>We characterize the spin Hall magnetoresistance (SMR), spin Seebeck effect (SSE), and dampinglike spin-orbit torque (SOT) in thulium iron garnet/platinum bilayers with perpendicular magnetic anisotropy by using harmonic Hall effect measurements. By consecutive annealing steps followed by measurement…

[Phys. Rev. B 95, 115428] Published Fri Mar 24, 2017

]]>The interlayer couplings in commensurate and incommensurate bilayer structures of transition-metal dichalcogenides are investigated with perturbative treatment. The interlayer coupling in $\pm \mathbf{K}$ valleys can be decomposed into a series of hopping terms with distinct phase factors. In H-type and R-type co…

[Phys. Rev. B 95, 115429] Published Fri Mar 24, 2017

]]>[Phys. Rev. B 95, 119905] Published Fri Mar 24, 2017

]]>The control and generation of spin-polarized current (SPC) without magnetic materials and an external magnetic field is a big challenge in spintronics and normally requires a spin-flip mechanism. In this Rapid Communication, we show the theoretical discovery of all-electrical generation of SPC witho…

[Phys. Rev. B 95, 121407(R)] Published Fri Mar 24, 2017

]]>The construction of fractional quantum Hall (FQH) states from the two-dimensional array of quantum wires provides a useful way to control strong interactions in microscopic models and has been successfully applied to the Laughlin, Moore-Read, and Read-Rezayi states. We extend this construction to th…

[Phys. Rev. B 95, 125130] Published Fri Mar 24, 2017

]]>The general covariance of the Dirac equation is exploited in order to explore the curvature effects appearing in the electronic properties of graphene. Two physical situations are then considered: the weak curvature regime, with $\left|R\right|<1/{L}^{2}$, and the strong curvature regime, with $1/{L}^{2}\ll \left|R\right|<1/{d}^{2}$, where $\dots $

[Phys. Rev. B 95, 125432] Published Fri Mar 24, 2017

]]>Uranium nitride fuel is considered for fast reactors (GEN-IV generation and space reactors) and for light water reactors as a high-density fuel option. Despite this large interest, there is a lack of information about its behavior for in-pile and out-of-pile conditions. From the present literature, …

[Phys. Rev. B 95, 094117] Published Thu Mar 23, 2017

]]>Entanglement entropy is a widely applicable indicator of the onset of quantum chaos. In particular, the entanglement entropy of the wave function after a quench from an initial state with low entanglement can be used to study the thermalization of the system. Here, the authors propose an initial-state independent quantity called the “operator entanglement entropy” (opEE) to extract the properties of the unitary evolution operator. They study the growth of the opEE in Floquet, chaotic, and many-body localized systems. They respectively have a linear, power-law, and logarithmic growth before reaching extensive saturation values. The most chaotic Floquet spin model has the maximal saturation value among the three classes and is identical to the value of a random unitary operator (the Page value). The authors interpret the opEE as the state EE of a quenched state living in a doubled Hilbert space, thus establishing its consistency with the existing state EE results. They conclude that the EE of the evolution operator should characterize the propagation of information in these systems.

[Phys. Rev. B 95, 094206] Published Thu Mar 23, 2017

]]>We have performed high-resolution powder x-ray-diffraction measurements on a sample of ${}^{242}\mathrm{PuCoGa}_{5}$, the heavy-fermion superconductor with the highest critical temperature of ${T}_{c}=18.7\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. The results show that the tetragonal symmetry of its crystallographic lattice is preserved down to 2 K. Marginal evid…

[Phys. Rev. B 95, 094517] Published Thu Mar 23, 2017

]]>The damping of spin waves transmitted through a two-port magnonic device implemented on a yttrium iron garnet thin film is shown to be proportional to the temperature gradient imposed on the device. The sign of the damping depends on the relative orientation of the magnetic field, the wave vector, a…

[Phys. Rev. B 95, 104432] Published Thu Mar 23, 2017

]]>Crossed Andreev reflection (cAR) is a scattering process that happens in a quantum transport setup consisting of two normal metals (NM) attached to a superconductor (SC), where an electron incident from one NM results in a hole emerging in the other. Typically, electron tunneling (ET) through the su…

[Phys. Rev. B 95, 104517] Published Thu Mar 23, 2017

]]>Displacements of atoms and molecules away from lattice sites in helium and parahydrogen solids at low temperature have been studied by means of quantum Monte Carlo simulations. In the bcc phases of ${}^{3}\mathrm{He}$ and ${}^{4}\mathrm{He}$, atomic displacements are largely quantum-mechanical in character, even at melting. The co…

[Phys. Rev. B 95, 104518] Published Thu Mar 23, 2017

]]>By employing angle-resolved photoemission spectroscopy combined with first-principles calculations, we performed a systematic investigation on the electronic structure of LaBi, which exhibits extremely large magnetoresistance (XMR), and is theoretically predicted to possess band anticrossing with no…

[Phys. Rev. B 95, 115140] Published Thu Mar 23, 2017

]]>The boundary of a two-dimensional topological superconductor can be modeled by a conformal field theory. Here we demonstrate the behaviors of this high level description emerging from a microscopic model at finite temperatures. To achieve that, we analyze the low-energy sector of Kitaev's honeycomb …

[Phys. Rev. B 95, 115141] Published Thu Mar 23, 2017

]]>We theoretically investigate the unusual features of the magnetotransport in a monolayer phosphorene ferromagnetic/normal/ferromagnetic (F/N/F) hybrid structure. We find that the charge conductance can feature a minimum at parallel (P) configuration and a maximum near the antiparallel (AP) configura…

[Phys. Rev. B 95, 115426] Published Thu Mar 23, 2017

]]>We provide a theory of how heat tunnels between two parallel metal surfaces separated by an air gap. Two contributions are calculated: (1) electron-electron interactions and (2) photon fields from surface plasmons. Both contributions can transfer energy through low energy electron pairs. Our concern…

[Phys. Rev. B 95, 115427] Published Thu Mar 23, 2017

]]>Magneto-quantum oscillation experiments in high-temperature superconductors show a strong thermally induced suppression of the oscillation amplitude approaching the critical dopings [B. J. Ramshaw *et al.*, Science **348**, 317 (2014); H. Shishido *et al.*, Phys. Rev. Lett. **104**, 057008 (2010); P. Walmsley…

[Phys. Rev. B 95, 121106(R)] Published Thu Mar 23, 2017

]]>Half-filled Landau levels form a zoo of strongly correlated phases. These include non-Fermi-liquids (NFLs), fractional quantum Hall (FQH) states, nematic phases, and FQH nematic phases. This diversity begs the following question: what keeps the balance between the seemingly unrelated phases? The ans…

[Phys. Rev. B 95, 125127] Published Thu Mar 23, 2017

]]>The electrical, crystallographic, and magnetic properties of ultrathin magnetite (${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$) have been studied in detail, by employing superlattice structures of ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$/${\mathrm{MgFe}}_{2}{\mathrm{O}}_{4}$ and ${\mathrm{Fe}}_{3}{\mathrm{O}}_{4}$/MgO on a variety of substrates. By careful analysis of their properties, the influence of substrate stoichiometry, ${\mathrm{Fe}}_{3}{\mathrm{\dots}}_{}$

[Phys. Rev. B 95, 125128] Published Thu Mar 23, 2017

]]>We show that spin $S=1$ system with large and random single-ion anisotropy can be at low energies mapped to a $S=1/2$ system with random magnetic fields. This is, for example, realized in $\mathrm{Ni}({\mathrm{Cl}}_{1-x}{\mathrm{Br}}_{x}{)}_{2}-4\mathrm{SC}({\mathrm{NH}}_{2}{)}_{2}$ compound (DTNX) and therefore it represents a long-sought realization of random local (on-si…

[Phys. Rev. B 95, 125129] Published Thu Mar 23, 2017

]]>We explore the competition and coupling of vibrational and electronic contributions to the heat capacity of Al and ${\mathrm{Al}}_{3}\mathrm{Sc}$ at temperatures below 50 K, combining experimental calorimetry with highly converged finite-temperature density functional theory calculations. We find that semilocal exchange-cor…

[Phys. Rev. B 95, 094307] Published Wed Mar 22, 2017

]]>On the basis of fully relativistic Korringa-Kohn-Rostoker calculations and in conjunction with the coherent potential approximation and the linear response formalism, we present a complete *ab initio* study of the influence of alloy disorder on the static and dynamic (Gilbert damping) magnetic propert…

[Phys. Rev. B 95, 094425] Published Wed Mar 22, 2017

]]>Superfluid ${}^{3}\mathrm{He}$ is a spin-triplet $\left(S=1\right)$, $p$-wave $\left(L=1\right)$ BCS condensate of Cooper pairs with total angular momentum $J=0$ in the ground state. In addition to the breaking of U(1) gauge symmetry, separate spin or orbital rotation symmetry is broken to the maximal subgroup $\mathrm{SO}{\left(3\right)}_{S}\times \mathrm{SO}{\left(3\right)}_{L}\to {\mathrm{SO}\left(3\right)}_{J}$. The fermions…

[Phys. Rev. B 95, 094515] Published Wed Mar 22, 2017

]]>As charge carriers traverse a single superconductor ferromagnet interface, they experience an additional spin-dependent phase angle that results in spin mixing and the formation of a bound state called the Andreev bound state. Here we explore whether point contact Andreev reflection can be used to d…

[Phys. Rev. B 95, 094516] Published Wed Mar 22, 2017

]]>Carbides play a central role for the strength and ductility in many materials. Simulating the impact of these precipitates on the mechanical performance requires knowledge about their atomic configuration. In particular, the C content is often observed to substantially deviate from the ideal stoichi…

[Phys. Rev. B 95, 104108] Published Wed Mar 22, 2017

]]>Thermally fluctuating sheets and ribbons provide an intriguing forum in which to investigate strong violations of Hooke's Law: Large distance elastic parameters are in fact not constant but instead depend on the macroscopic dimensions. Inspired by recent experiments on free-standing graphene cantile…

[Phys. Rev. B 95, 104109] Published Wed Mar 22, 2017

]]>We study the two-magnon nonresonant Raman scattering in the $(\pi ,\pi )$ and $(\pi ,0)$ in-plane ordered antiferromagnetic phases of a spin-$S{J}_{1x}\text{\u2212}{J}_{1y}\text{\u2212}{J}_{2}\text{\u2212}{J}_{c}$ Heisenberg model on the tetragonal lattice within the framework of the spin-wave theory. We show that magnon-magnon interactions may significantly change the…

[Phys. Rev. B 95, 104431] Published Wed Mar 22, 2017

]]>We study spin transport through a normal metal-spin superconductor junction. A spin-flip reflection is demonstrated at the interface, where a spin-up electron incident from the normal metal can be reflected as a spin-down electron and the spin $2\times \hslash /2$ will be injected into the spin superconductor. Whe…

[Phys. Rev. B 95, 104516] Published Wed Mar 22, 2017

]]>Quantum spin liquids can be well described in the language of gauge theory. While most theoretical effort has been focused on gauge theories with a familiar vector gauge field, there exists a stable class of quantum spin liquids described by higher-rank tensor gauge fields. Here, the authors focus on a class of stable three-dimensional spin liquids described by symmetric tensor $U$(1) gauge fields. They find that these spin liquids feature an exotic class of excitations that are restricted to motion along lower-dimensional subspaces, a phenomenon seen earlier in fracton models. They show how this subdimensional behavior follows naturally from a set of higher-moment charge conservation laws that place severe restrictions on particle motion. This work opens up an exciting new direction in the field of spin liquids.

[Phys. Rev. B 95, 115139] Published Wed Mar 22, 2017

]]>We study energetic, magnetic, and electronic properties of diluted substitutional Mn pairs on reconstructed $\left(001\right)$ GaAs surfaces. The studies are based on first-principles calculations in the framework of density functional theory. We demonstrate that the stability of the systems strongly depends on …

[Phys. Rev. B 95, 115311] Published Wed Mar 22, 2017

]]>Topological Dirac semimetals (TDSs) represent a new state of quantum matter recently discovered that offers a platform for realizing many exotic physical phenomena. A TDS is characterized by the linear touching of bulk (conduction and valance) bands at discrete points in the momentum space [i.e., th…

[Phys. Rev. B 95, 125126] Published Wed Mar 22, 2017

]]>We have performed high-resolution angle-resolved photoemission spectroscopy (ARPES) on trigonal tellurium consisting of helical chains in the crystal. Through the band-structure mapping in the three-dimensional Brillouin zone, we found a definitive evidence for the band splitting originating from th…

[Phys. Rev. B 95, 125204] Published Wed Mar 22, 2017

]]>We have investigated the dispersion relation of polariton condensates in a CuBr microcavity with the use of angle-resolved photoluminescence (PL) spectroscopy at 77 K. The polariton condensation was clearly confirmed by the thresholdlike changes in the PL intensity, energy, and bandwidth of the lowe…

[Phys. Rev. B 95, 125315] Published Wed Mar 22, 2017

]]>We present a quantum Hall effect of magnons in two-dimensional clean insulating magnets at finite temperature. Through the Aharonov-Casher effect, a magnon moving in an electric field acquires a geometric phase and forms Landau levels in an electric field gradient of sawtooth form. At low temperatur…

[Phys. Rev. B 95, 125429] Published Wed Mar 22, 2017

]]>Quantum anomalous Hall (QAH) insulator is a topological phase which exhibits chiral edge states in the absence of magnetic field. The celebrated Haldane model is the first example of QAH effect (QAHE), but it is difficult to realize. Here, we predict the two-dimensional (2D) single-atomic-layer ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$…

[Phys. Rev. B 95, 125430] Published Wed Mar 22, 2017

]]>Introducing a powerful method, we obtain the exact solutions for a Coulomb impurity in two-dimensional infinite and finite topological insulators. The level order and zero-energy degeneracy of the spectra are found to be quite different between topological trivial and nontrivial phases. For quantum …

[Phys. Rev. B 95, 125431] Published Wed Mar 22, 2017

]]>We numerically investigate the dynamics of entanglement in a chain of spinless fermions with nonrandom but long-range hopping and interactions, and with random on-site energies. For moderate disorder in the absence of interactions, the chain hosts delocalized states at the top of the band which unde…

[Phys. Rev. B 95, 094205] Published Tue Mar 21, 2017

]]>The influence of recently discovered topological transition between type-I and type-II Weyl semimetals on superconductivity is considered. A set of Gorkov equations for weak superconductivity in Weyl semimetal under topological phase transition is derived and solved. The critical temperature and sup…

[Phys. Rev. B 95, 094513] Published Tue Mar 21, 2017

]]>Recently it has been found that models with at least two lifetimes have to be considered when analyzing the angle-resolved photoemission data in the nodal region of the cuprates [Kondo *et al.*, Nat. Commun. **6**, 7699 (2015)]. In this paper we compare two such models. First we show that the phenomenolo…

[Phys. Rev. B 95, 094514] Published Tue Mar 21, 2017

]]>[Phys. Rev. B 95, 099903] Published Tue Mar 21, 2017

]]>Phonon lifetime in materials is an important observable that conveys basic information about structure, dynamics, and anharmonicity. Recent vibrational transient-grating measurements, using picosecond infrared pulses from free-electron lasers, have demonstrated that the vibrational-population decay …

[Phys. Rev. B 95, 104205] Published Tue Mar 21, 2017

]]>The ordered hexagonal perovskite ${\mathrm{Ba}}_{2}{\mathrm{CuTeO}}_{6}$ hosts weakly coupled $S=\frac{1}{2}$ spin ladders produced by an orbital ordering of ${\mathrm{Cu}}^{2+}$. The magnetic susceptibility $\chi \left(T\right)$ of ${\mathrm{Ba}}_{2}{\mathrm{CuTeO}}_{6}$ is well described by that expected for isolated spin ladders with exchange coupling of $J\approx 86\phantom{\rule{0.16em}{0ex}}\mathrm{K}$ but shows a deviation from the expecte…

[Phys. Rev. B 95, 104428] Published Tue Mar 21, 2017

]]>We propose quantum devices having spin-orbit coupling (but no magnetic fields or magnetic materials) that, when attached to leads, yield a high degree of transmitted electron polarization. An example of such a simple device is treated within a tight binding model composed of two one-dimensional chai…

[Phys. Rev. B 95, 104429] Published Tue Mar 21, 2017

]]>The rotational dynamics of magnetic nanoparticles in rotating magnetic fields in the presence of thermal noise is studied both theoretically and by performing numerical calculations. Equations for the dynamics of particles with uniaxial magnetic anisotropy are studied and the phase lag between the r…

[Phys. Rev. B 95, 104430] Published Tue Mar 21, 2017

]]>We report the effects of heavy-ion irradiation on FeSe single crystals by irradiating uranium up to a dose-equivalent matching field of ${B}_{\varphi}=16$ T. Almost continuous columnar defects along the $c$ axis with a diameter of $\sim 10$ nm are confirmed by high-resolution transmission electron microscopy. ${T}_{c}$ is foun…

[Phys. Rev. B 95, 104514] Published Tue Mar 21, 2017

]]>We investigate proximity-induced superconductivity in monolayers of transition-metal dichalcogenides (TMDs) in the presence of an externally generated exchange field. A variety of superconducting order parameters is found to emerge from the interplay of magnetism and superconductivity, covering the …

[Phys. Rev. B 95, 104515] Published Tue Mar 21, 2017

]]>Most theoretical studies of nanoscale transport in molecular junctions rely on the combination of the Landauer formalism with Kohn-Sham density functional theory (DFT) using standard local and semilocal functionals to approximate exchange and correlation effects. In many cases, the resulting conduct…

[Phys. Rev. B 95, 115137] Published Tue Mar 21, 2017

]]>The search for symmetry-protected two-dimensional (2D) Dirac semimetals analogous to graphene is important both for fundamental and practical interest. The 2D Dirac cones are protected by crystalline symmetries and magnetic ordering may destroy their robustness. Here we propose a general framework t…

[Phys. Rev. B 95, 115138] Published Tue Mar 21, 2017

]]>We study Veselago lensing of massless Dirac fermions by *n-p* junctions for electron sources with a certain polarization. This polarization corresponds to pseudospin for graphene and to real spin for topological insulators. Both for a point source and for injection into a sample through a narrow lead,…

[Phys. Rev. B 95, 115310] Published Tue Mar 21, 2017

]]>We investigate scattering of the topological surface state of a three-dimensional time-reversal invariant topological insulator when graphene is deposited on the topological-insulator surface. Specifically, we consider the (111) surface of a ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$-like topological insulator. We present a low-energy…

[Phys. Rev. B 95, 115424] Published Tue Mar 21, 2017

]]>The Stokes paradox is the statement that in a viscous two-dimensional fluid, the “linear response” problem of fluid flow around an obstacle is ill posed. We present a simple consequence of this paradox in the hydrodynamic regime of a Fermi liquid of electrons in two-dimensional metals. Using hydrody…

[Phys. Rev. B 95, 115425] Published Tue Mar 21, 2017

]]>Zigzag edges of the honeycomb structure of graphene exhibit magnetic polarization, making them attractive as building blocks for spintronic devices. Here, we show that devices with zigzag-edged triangular antidots perform essential spintronic functionalities, such as spatial spin splitting or spin f…

[Phys. Rev. B 95, 121406(R)] Published Tue Mar 21, 2017

]]>We present a partition-free approach to the evolution of density matrices for open quantum systems coupled to a harmonic environment. The influence functional formalism combined with a two-time Hubbard-Stratonovich transformation allows us to derive a set of exact differential equations for the redu…

[Phys. Rev. B 95, 125124] Published Tue Mar 21, 2017

]]>The performance of the density matrix renormalization group (DMRG) is strongly influenced by the choice of the local basis of the underlying physical lattice. We demonstrate that, for the two-dimensional Hubbard model, the hybrid–real-momentum-space formulation of the DMRG is computationally more ef…

[Phys. Rev. B 95, 125125] Published Tue Mar 21, 2017

]]>Because disorders are inevitable in realistic nanodevices, the capability to quantitatively simulate the disorder effects on electron transport is indispensable for quantum transport theory. Here, we report a unified and effective first-principles quantum transport method for analyzing effects of ch…

[Phys. Rev. B 95, 125428] Published Tue Mar 21, 2017

]]>We present the results of exact numerical calculations of the dielectric properties of tetrathiafulvalene-$p$-chloranil (TTF-CA) using the extended Hubbard model. The electronic polarization ${\overline{P}}_{\mathrm{el}}$ of the ionic ground state is obtained by directly calculating the adiabatic flow of current. The direction…

[Phys. Rev. B 95, 094116] Published Mon Mar 20, 2017

]]>Raman spectroscopy was used to measure the frequencies of phonons in ${\mathrm{Si}}_{24}$ with an open clathrate structure at temperatures from 80 to 400 K with simultaneous pressures of 0 to 8 GPa. The frequency shifts of the different phonons were substantially different under either temperature or pressure. The …

[Phys. Rev. B 95, 094306] Published Mon Mar 20, 2017

]]>We observe metastable localized spin configurations with topological charges ranging from $Q=-3$ to $Q=2$ in a (${\mathrm{Pt}}_{0.95}{\mathrm{Ir}}_{0.05}$)/Fe bilayer on a $\mathrm{Pd}\left(111\right)$ surface by performing spin dynamics simulations, using a classical Hamiltonian parametrized by *ab initio* calculations. We demonstrate that the frustration…

[Phys. Rev. B 95, 094423] Published Mon Mar 20, 2017

]]>The crystal structure, magnetic ground state, and the temperature-dependent microscopic spin-spin correlations of the frustrated honeycomb lattice antiferromagnet $\mathrm{N}{\mathrm{a}}_{2}\mathrm{C}{\mathrm{o}}_{2}\mathrm{Te}{\mathrm{O}}_{6}$ have been investigated by powder neutron diffraction. A long-range antiferromagnetic (AFM) ordering has been found below ${T}_{\mathrm{N}}\sim \mathrm{24\dots}$

[Phys. Rev. B 95, 094424] Published Mon Mar 20, 2017

]]>Berry connection is conventionally defined as a static gauge field in the Brillouin zone. Here, the authors show that for three-dimensional (3D) time-reversal invariant superconductors, a generalized Berry gauge field behaves as a fluctuating field of a momentum-space Chern-Simons gauge theory, which is the effective theory of the system. Furthermore, the gapless nodal lines in the momentum space which may arise in such superconductors play exactly the role of Wilson loop observables, and their linking and knot invariants modify the gravitational theta angle which can be evaluated from the Chern-Simons action. This angle induces a topological gravitomagnetoelectric effect where a temperature gradient induces a rotational energy flow. The authors also show how this idea may be potentially generalized to realize topological strings in six-dimensional phase space, where the physical space defects play the role of topological D-branes.

[Phys. Rev. B 95, 094512] Published Mon Mar 20, 2017

]]>Electrical and thermal spin currents excited by an electric current have been systematically investigated in lateral spin valves consisting of CoFeAl and ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ (Py) wires bridged by a Cu strip. In the electrical spin signal, the reciprocity between the current and voltage probes was clearly confi…

[Phys. Rev. B 95, 100403(R)] Published Mon Mar 20, 2017

]]>The friction behavior of atomically stepped metal surfaces under contact loading is studied using molecular dynamics simulations. While real rough metal surfaces involve roughness at multiple length scales, the focus of this paper is on understanding friction of the smallest scale of roughness: atom…

[Phys. Rev. B 95, 104106] Published Mon Mar 20, 2017

]]>The dynamics of the phase separation of very dilute ${}^{3}$He-${}^{4}$He solid solutions is studied using high-sensitivity low-temperature NMR techniques. This paper compares the results observed at very low concentrations (down to 16 ppm ${}^{3}$He) with previous results up to 2%. The growth of ${}^{3}$He nanodroplets after phase separation is analyzed and shown to follow a one-third power-law dependence at long times as expected for Ostwald ripening. The time scale for the dynamics is governed by the relatively fast quantum diffusion in solid helium, allowing the long-term behavior of the ripening process to be explored by experiments lasting a few days rather than several months, as in the case of metallic alloys.

[Phys. Rev. B 95, 104107] Published Mon Mar 20, 2017

]]>We calculate the probability distribution of entanglement entropy $S$ across a cut of a finite one-dimensional spin chain of length $L$ at an infinite-randomness fixed point using Fisher's strong randomness renormalization group (RG). Using the random transverse-field Ising model as an example, the dist…

[Phys. Rev. B 95, 104204] Published Mon Mar 20, 2017

]]>Spin waves are promising candidates for information carriers in advanced technology. The interactions between spin waves and acoustic waves in magnetic nanostructures are of much interest because of their potential application for spin-wave generation, amplification, and transduction. We investigate…

[Phys. Rev. B 95, 104425] Published Mon Mar 20, 2017

]]>The synchronized magnetization dynamics in ferromagnets on a nonmagnetic heavy metal caused by the spin Hall effect is investigated theoretically. The direct and inverse spin Hall effects near the ferromagnetic/nonmagnetic interface generate longitudinal and transverse electric currents. The phenome…

[Phys. Rev. B 95, 104426] Published Mon Mar 20, 2017

]]>The electronic structure and intrinsic magnetic properties of ${\mathrm{Fe}}_{2}{\mathrm{AlB}}_{2}$-related compounds and their alloys have been investigated using density functional theory. For ${\mathrm{Fe}}_{2}{\mathrm{AlB}}_{2}$, the crystallographic $a$ axis is the easiest axis, which agrees with experiments. The magnetic ground state of ${\mathrm{Mn}}_{2}{\mathrm{AlB}}_{2}$ is found …

[Phys. Rev. B 95, 104427] Published Mon Mar 20, 2017

]]>We show theoretically that $\pi $ Josephson junctions may be constructed by use of antiferromagnetic (AF) metals between superconducting electrodes. We argue that the AF magnetic ordering introduces the energy difference of electrons in a Cooper pair due to the effect of the exchange field varying in spa…

[Phys. Rev. B 95, 104513] Published Mon Mar 20, 2017

]]>Flat bands (FB) are strictly dispersionless bands in the Bloch spectrum of a periodic lattice Hamiltonian, recently observed in a variety of photonic and dissipative condensate networks. FB Hamiltonians are fine-tuned networks, still lacking a comprehensive generating principle. We introduce a FB ge…

[Phys. Rev. B 95, 115135] Published Mon Mar 20, 2017

]]>The $\nu =12/5$ fractional quantum Hall plateau observed in $\mathrm{GaAs}$ semiconductor wells is a suspect in the search for non-Abelian Fibonacci anyons. Using the infinite density matrix renormalization group, we find clear evidence that fillings $\nu =12/5$ and $\nu =13/5$ are in the $k=3$ Read-Rezayi phase in the absence…

[Phys. Rev. B 95, 115136] Published Mon Mar 20, 2017

]]>In a tight-binding lattice model with $n$ orbitals (single-particle states) per site, Wannier functions are $n$-component vector functions of position that fall off rapidly away from some location, and such that a set of them in some sense span all states in a given energy band or set of bands; compactl…

[Phys. Rev. B 95, 115309] Published Mon Mar 20, 2017

]]>The existence of pseudomagnetic helicons is predicted for strained Dirac and Weyl materials. The corresponding collective modes are reminiscent of the usual helicons in metals in strong magnetic fields but can exist even without a magnetic field due to a strain-induced background pseudomagnetic fiel…

[Phys. Rev. B 95, 115422] Published Mon Mar 20, 2017

]]>Pseudocapacitors are energy-storage devices characterized by fast and reversible redox reactions that enable them to store large amounts of electrical energy at high rates. We simulate the response of pseudocapacitive electrodes under realistic conditions to identify the microscopic factors that det…

[Phys. Rev. B 95, 115423] Published Mon Mar 20, 2017

]]>An ordered state in the spin sector that breaks parity without breaking time-reversal symmetry, i.e., that can be considered dynamically generated spin-orbit coupling, was proposed to explain puzzling observations in a range of different systems. Here, we derive severe restrictions for such a state …

[Phys. Rev. B 95, 125122] Published Mon Mar 20, 2017

]]>The layered perovskite cobaltite $R{\mathrm{BaCo}}_{2}{\mathrm{O}}_{5.5}$ ($R$: rare-earth elements) exhibits an abrupt temperature-induced metal-insulator transition (MIT) that has been attributed to spin-state ordering (SSO) of ${\mathrm{Co}}^{3+}$ ions. Here we investigate the hole-doping member of ${\mathrm{PrBaCo}}_{2}{\mathrm{O}}_{5.5+x}$ ($0\le x\le 0.24$) with multiple techni…

[Phys. Rev. B 95, 125123] Published Mon Mar 20, 2017

]]>Nuclear spin relaxation is studied in $n$-GaAs thick layers and microcavity samples with different electron densities. We reveal that both in metallic samples where electrons are free and mobile, and in insulating samples where electrons are localized, nuclear spin relaxation is strongly enhanced at l…

[Phys. Rev. B 95, 125312] Published Mon Mar 20, 2017

]]>The mechanisms contributing to experimental quality factors of short wavelength ($\lambda =440\u2013480$ nm) III-nitride on silicon one-dimensional photonic crystal cavities were quantified. Fluctuations in fundamental and first-order cavity mode wavelength and quality factor were compared over sets of nominally …

[Phys. Rev. B 95, 125313] Published Mon Mar 20, 2017

]]>The origin of efficiency droop in state-of-the-art quality InGaN/GaN and GaN/AlGaN quantum wells (QWs) grown on various crystal planes is studied by means of time-resolved photoluminescence spectroscopy associated with a precise determination of the QW carrier density. In a first set of experiments,…

[Phys. Rev. B 95, 125314] Published Mon Mar 20, 2017

]]>We study a bipartite linear chain constituted by spherical metallic nanoparticles, where each nanoparticle supports a localized surface plasmon. The near-field dipolar interaction between the localized surface plasmons gives rise to collective plasmons, which are extended over the whole nanoparticle…

[Phys. Rev. B 95, 125426] Published Mon Mar 20, 2017

]]>The relationship between the universal conductance fluctuation and the weak localization effect in monolayer graphene is investigated. By comparing experimental results with the predictions of the weak localization theory for graphene, we find that the ratio of the elastic intervalley scattering tim…

[Phys. Rev. B 95, 125427] Published Mon Mar 20, 2017

]]>The influence of uniaxial single-ion anisotropy $-D{S}_{z}^{2}$ on the magnetic and thermal properties of Heisenberg antiferromagnets (AFMs) is investigated. The uniaxial anisotropy is treated exactly and the Heisenberg interactions are treated within unified molecular field theory (MFT) [Phys. Rev. B **91**, 064…

[Phys. Rev. B 95, 094421] Published Fri Mar 17, 2017

]]>The family of magnetic rare-earth pyrochlore oxides ${\mathrm{R}}_{2}{\mathrm{M}}_{2}{\mathrm{O}}_{7}$ plays host to a diverse array of exotic phenomena, driven by the interplay between geometrical frustration and spin-orbit interaction, which leads to anisotropy in both magnetic moments and their interactions. In this article we establish a …

[Phys. Rev. B 95, 094422] Published Fri Mar 17, 2017

]]>We report an inelastic neutron scattering study of single crystals of (${\mathrm{Li}}_{0.8}{\mathrm{Fe}}_{0.2}$)ODFeSe. Temperature-dependent low-energy spin excitations are observed near $\mathbf{Q}=(0.5,0.27,0.5)$ and equivalent wave vectors symmetrically surrounding $\mathbf{Q}=(0.5,0.5,0.5)$ in the 1-Fe Brillouin zone, consistent with a Fermi-sur…

[Phys. Rev. B 95, 100504(R)] Published Fri Mar 17, 2017

]]>We consider a fermionic Hubbard chain with an additional next-to-nearest neighbor hopping term. We study the thermalization rates of the quasimomentum distribution function within a quantum Boltzmann equation approach. We find that the thermalization rates are proportional to the square of the next-…

[Phys. Rev. B 95, 104304] Published Fri Mar 17, 2017

]]>We demonstrate the existence of exceptional points of degeneracy (EPDs) of periodic eigenstates in non-Hermitian coupled chains of dipolar scatterers. Guided modes supported by these structures can exhibit an EPD in their dispersion diagram at which two or more Bloch eigenstates coalesce, in both th…

[Phys. Rev. B 95, 104305] Published Fri Mar 17, 2017

]]>We report on spin- and angular-resolved photoemission spectroscopy using a high-resolution imaging spin filter based on a large Ir(001) crystal enhancing the effective figure of merit for spin detection by a factor of over ${10}^{3}$ compared to standard single-channel detectors. Furthermore, we review the…

[Phys. Rev. B 95, 104423] Published Fri Mar 17, 2017

]]>We report on the multicaloric response of the ${\mathrm{Fe}}_{49}{\mathrm{Rh}}_{51}$ alloy under the combined application of hydrostatic pressure and magnetic field. Experimental data are complemented by a mean field model that takes into account the interplay between structural and magnetic degrees of freedom. A large multicalo…

[Phys. Rev. B 95, 104424] Published Fri Mar 17, 2017

]]>The Fano factor stability diagram of a ${C}_{3v}$ symmetric triangular quantum dot is analyzed for increasing electron fillings $N$. At low filling, conventional Poissonian and sub-Poissonian behavior is found. At larger filling, $N\ge 2$, a breaking of the electron-hole symmetry is manifested in super-Poissonian…

[Phys. Rev. B 95, 115133] Published Fri Mar 17, 2017

]]>Here, the authors make connection to the foundation of quantum mechanics. As stated by Schrquotodinger, entanglement is “the characteristic trait of quantum mechanics” and seemingly at odds with the description of nature. In this joint experimental and theoretical work, the authors discuss the possibility of spin entanglement of two freely propagating electrons. These have been created by a collision of a spin-polarized primary electron with the Shockley surface state of the Cu(111) surface. The contribution of this state can clearly be identified in the experiment and allows use of its particular features. The electron scattering study done here resembles the scenario envisioned by the seminal works of Einstein-Podolsky-Rosen and Schrquotodinger to work out the peculiar nature of entanglement.

[Phys. Rev. B 95, 115134] Published Fri Mar 17, 2017

]]>We study the effects of strong coupling between a superconductor and a semiconductor nanowire on the creation of the Majorana bound states, when the quasiparticle dwell time in the normal part of the nanowire is much shorter than the inverse superconducting gap. This “short-junction” limit is releva…

[Phys. Rev. B 95, 115421] Published Fri Mar 17, 2017

]]>[Phys. Rev. B 95, 119904] Published Fri Mar 17, 2017

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