We present an extensive numerical study of a type of frustrated itinerant magnetism on the pyrochlore lattice. In this theory, the pyrochlore magnet can be viewed as a cross-linking network of Kondo or double-exchange chains. Contrary to models based on Mott insulators, this itinerant magnetism appr...

[Phys. Rev. B 98, 214423] Published Thu Dec 13, 2018

]]>The magnetic field of a cuboidal cluster of eight magnetic spheres is measured. It decays with the inverse seventh power of the distance. This corresponds formally to a multipole named a dotriacontapole. This strong decay is explained on the basis of dipole-dipole interaction and the symmetry of the...

[Phys. Rev. B 98, 214424] Published Thu Dec 13, 2018

]]>Measurements of temperature-dependent resistance and magnetization under hydrostatic pressures up to 2.13 GPa are reported for single-crystalline, superconducting ${\mathrm{BaBi}}_{3}$. A temperature-pressure phase diagram is determined and the results suggest three different superconducting phases $\alpha $, $\beta $, and $\gamma $ in t...

[Phys. Rev. B 98, 214509] Published Thu Dec 13, 2018

]]>Motivated by recent attention to a potential antiferromagnetic quantum critical point at ${x}_{c}\sim 0.19$, we have used inelastic neutron scattering to investigate the low-energy spin excitations in crystals of ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_{x}{\mathrm{CuO}}_{4}$ bracketing ${x}_{c}$. We observe a peak in the normal-state spin-fluctuation weight at $\sim 20\phantom{\rule{0.16em}{0ex}}\mathrm{me...}$

[Phys. Rev. B 98, 224508] Published Thu Dec 13, 2018

]]>Using first-principle Hybrid Monte Carlo (HMC) simulations, we carry out an unbiased study of the competition between spin-density wave (SDW) and charge-density wave (CDW) order in the extended Hubbard model on the two-dimensional hexagonal lattice at half filling. We determine the phase diagram in ...

[Phys. Rev. B 98, 235129] Published Thu Dec 13, 2018

]]>Here, we report a combined study of transport and thermodynamic measurements on the layered pnictide material ${\mathrm{SrAg}}_{4}{\mathrm{As}}_{2}$. Upon cooling, a drop in electrical and Hall resistivity, a jump in heat capacity, and an increase in susceptibility and magnetoresistance are observed around 110 K. All suggest non...

[Phys. Rev. B 98, 235130] Published Thu Dec 13, 2018

]]>We complement previous functional renormalization group (fRG) studies of the two-dimensional Hubbard model by mean-field calculations. The focus falls on Van Hove filling and the hopping amplitude ${t}^{\prime}/t=0.341$. The fRG data suggest a quantum critical point (QCP) in this region and in its vicinity a si...

[Phys. Rev. B 98, 235131] Published Thu Dec 13, 2018

]]>The optomechanical interaction of a resonant particle with a current sheet, graphene for example, induced by its surface plasmon is investigated. It is predicted that stable equilibrium positions for the particle at finite distances from the sheet can be formed. For high-index dielectric particles t...

[Phys. Rev. B 98, 235414] Published Thu Dec 13, 2018

]]>Resolving the structure of energy bands in transport experiments is a major challenge in condensed matter physics and material science. Sometimes, however, traditional electrical conductance or resistance measurements only provide very small signals, and thus limit the ability to obtain direct band-...

[Phys. Rev. B 98, 241106(R)] Published Thu Dec 13, 2018

]]>We consider the stability of nodal surfaces in fermionic band systems with respect to the Coulomb repulsion. It is shown that nodal surfaces at the Fermi level are gapped out at low temperatures due to emergent particle-hole orders. Energy dispersion of the nodal surface suppresses the instability t...

[Phys. Rev. B 98, 241107(R)] Published Thu Dec 13, 2018

]]>Axion insulators are magnetic topological insulators in which the nontrivial ${\mathbb{Z}}_{2}$ index is protected by inversion symmetry instead of time-reversal symmetry. The naturally gapped surfaces of axion insulators give rise to a half-quantized surface anomalous Hall conductivity (AHC), but the sign of the s...

[Phys. Rev. B 98, 245117] Published Thu Dec 13, 2018

]]>We investigate parity-mixing superconductivity in the two-dimensional Hubbard model with Rashba spin-orbit coupling, using cellular dynamical mean-field theory (CDMFT). A superconducting state with mixed singlet $d$-wave and triplet $p$-wave character is found in a wide range of doping. The singlet comp...

[Phys. Rev. B 98, 245118] Published Thu Dec 13, 2018

]]>When irradiated via high-frequency circularly polarized light, the stroboscopic dynamics in a Heisenberg spin system on a honeycomb lattice develops a next-nearest-neighbor (NNN) Dzyaloshinskii-Moriya (DM) type term, making it a magnonic Floquet topological insulator. We investigate the entanglement...

[Phys. Rev. B 98, 245119] Published Thu Dec 13, 2018

]]>Conventional $n$-dimensional topological superconductors (TSCs) have protected gapless $(n-1)$-dimensional boundary states. In contrast to this, second-order TSCs are characterized by topologically protected gapless $(n-2)$-dimensional states with the usual gapped $(n-1)$ boundaries. Here, we study a second...

[Phys. Rev. B 98, 245413] Published Thu Dec 13, 2018

]]>We consider the steady-state behavior of observables in the Su-Schrieffer-Heeger (SSH) model and in the one-dimensional transverse field quantum Ising model after a sudden quantum quench of the parameter controlling the gap. In the thermodynamic limit, and for times $t\to \infty $, we find nonanalyticities eve...

[Phys. Rev. B 98, 214306] Published Wed Dec 12, 2018

]]>Polarized-neutron diffraction (PND) experiments have revealed that the pseudogap state of the cuprates exhibits unusual intra-unit-cell (IUC) magnetism. At a qualitative level, the data indicate a moment direction that is neither perpendicular nor parallel to the $\mathrm{Cu}{\mathrm{O}}_{2}$ layers, yet an accurate measure...

[Phys. Rev. B 98, 214418] Published Wed Dec 12, 2018

]]>We report an inelastic neutron scattering study of magnetic excitations in a quantum paramagnet driven into a magnetically ordered state by chemical substitution, namely $\mathrm{Ni}{\left({\mathrm{Cl}}_{1-x}{\mathrm{Br}}_{x}\right)}_{2}\xb74\mathrm{SC}{\left({\mathrm{NH}}_{2}\right)}_{2}$ with $x=0.21\left(2\right)$. The measured spectrum is well accounted for by the generalized spin wave theory (GSWT) app...

[Phys. Rev. B 98, 214419] Published Wed Dec 12, 2018

]]>Layered ${\mathrm{Cr}}_{2}{\mathrm{Ge}}_{2}{\mathrm{Te}}_{6}$ is a promising two-dimensional (2D) material for van der Waals bonded ferromagnetic devices since its ferromagnetism can be maintained upon exfoliating the bulk down to a few layers. However, the magnetic interaction properties and phase-transition type of this system remain contro...

[Phys. Rev. B 98, 214420] Published Wed Dec 12, 2018

]]>First-principles calculations of high-temperature spin dynamics in solids in the context of nuclear magnetic resonance (NMR) are a long-standing problem, whose conclusive solution can significantly advance the applications of NMR as a diagnostic tool for material properties. In this work, we propose...

[Phys. Rev. B 98, 214421] Published Wed Dec 12, 2018

]]>${\mathrm{Sr}}_{2}{\mathrm{FeOsO}}_{6}$ is an insulating double perovskite compound which undergoes antiferromagnetic transitions at 140 (${T}_{\text{N1}}$) and 67 K (${T}_{\text{N2}}$). To study the underlying electronic and magnetic interactions giving rise to this behavior we have performed inelastic neutron scattering (INS) and resonant inelastic x-ray...

[Phys. Rev. B 98, 214422] Published Wed Dec 12, 2018

]]>Iron selenide superconductors exhibit unique characteristics distinct from iron pnictides, especially in the electron-doped region. Here, the authors report the synthesis of a new family of Li${}_{x}$(C${}_{3}$N${}_{2}$H${}_{10}{)}_{0.37}$FeSe materials, which features a continuous superconducting dome harboring a Lifshitz transition within the wide range of 0.06$\le x\le $0.68. Under electron doping, the anion height of FeSe layers deviates linearly away from the optimized values of pnictides. This feature leads to a new superconducting zone with unique electronic structures and strong orbital-selective electronic correlation.

[Phys. Rev. B 98, 214508] Published Wed Dec 12, 2018

]]>We study the spectrum of an impurity coupled to a Fermi sea (e.g., minority atom in an ultracold gas, exciton in a solid) by attraction strong enough to form a molecule/trion. We introduce a diagrammatic scheme which allows treating a finite mass impurity while reproducing the Fermi-edge singularity...

[Phys. Rev. B 98, 220302(R)] Published Wed Dec 12, 2018

]]>The magnetoresistance of ${\mathrm{Ni}}_{81}{\mathrm{Fe}}_{19}$ and ${\mathrm{Co}}_{83}{\mathrm{Gd}}_{17}$ ferromagnetic thin films is measured in Corbino disk geometry, and compared to the magnetoresistance of the same films measured in the Hall-bar geometry. The symmetry of the magnetoresistance profiles is drastically modified by changing the geometry of ...

[Phys. Rev. B 98, 220405(R)] Published Wed Dec 12, 2018

]]>Magnetotransport is investigated in thin films of the half-metallic ferrimagnet ${\mathrm{Mn}}_{2}{\mathrm{Ru}}_{x}\mathrm{Ga}$ in pulsed magnetic fields of up to 58 T. A nonvanishing Hall signal is observed over a broad temperature range, spanning the compensation temperature (155 K), where the net magnetic moment is strictly zero, the ...

[Phys. Rev. B 98, 220406(R)] Published Wed Dec 12, 2018

]]>Superconductivity occurring at low densities of mobile electrons is still a mystery since the standard theories do not apply in this regime. We address this problem by using a microscopic model for ferroelectric (FE) modes, which mediate an effective attraction between electrons. When the dispersion...

[Phys. Rev. B 98, 220505(R)] Published Wed Dec 12, 2018

]]>We report two distinct superconducting states with different crystal structures and a crossover from a type-II to a type-I superconductor (SC) in $(\mathrm{Ba},\mathrm{Sr})\mathrm{B}{\mathrm{i}}_{3}$. The superconducting parameters are revealed to classify two SCs: $\mathrm{BaB}{\mathrm{i}}_{3}$ is in the weak-coupling limit on the basis of $\mathrm{\Delta}C/{\gamma}_{\mathrm{n}}{T}_{\mathrm{c}}\sim 0.67$ and $2\mathrm{\Delta}/{k}_{\mathrm{B}}{T}_{\mathrm{c}}\sim \mathrm{...}$

[Phys. Rev. B 98, 220506(R)] Published Wed Dec 12, 2018

]]>We investigate the interplay between the structural reconstruction and the magnetic properties of Fe double layers on Ir (111) substrate using first-principles calculations based on density functional theory and mapping of the total energies on an atomistic spin model. We show that if a second Fe mo...

[Phys. Rev. B 98, 224415] Published Wed Dec 12, 2018

]]>We present a theoretical approach for spin-polarized hot-electron transport, as it occurs after excitation by ultrafast optical pulses in heterostructures formed by ferromagnetic and normal metals. We formulate a spin-dependent particle-in-cell model that solves the Boltzmann equation for excited el...

[Phys. Rev. B 98, 224416] Published Wed Dec 12, 2018

]]>We study a quantum impurity possessing both translational and internal rotational degrees of freedom interacting with a bosonic bath. Such a system corresponds to a “rotating polaron,” which can be used to model, e.g., a rotating molecule immersed in an ultracold Bose gas or superfluid helium. We de...

[Phys. Rev. B 98, 224506] Published Wed Dec 12, 2018

]]>We report an intense near-infrared pump, $c$-axis terahertz probe measurement on an electron-doped cuprate superconductor ${\mathrm{Pr}}_{0.88}{\mathrm{LaCe}}_{0.12}{\mathrm{CuO}}_{4}$ with ${T}_{c}=22$ K. The major effect of the intense pump is to induce a splitting of Josephson plasma edge below ${T}_{c}$, similar to the observation on hole-doped cuprate ${\mathrm{L...}}_{}$

[Phys. Rev. B 98, 224507] Published Wed Dec 12, 2018

]]>We study the nonequilibrium dynamics in the pump-probe spectroscopy of excitonic insulators using the spinless two-orbital model with phonon degrees of freedom in the time-dependent mean-field approximation. We introduce the pulse light as a time-dependent vector potential via the Peierls phase in t...

[Phys. Rev. B 98, 235127] Published Wed Dec 12, 2018

]]>Numerical simulations show that the spin-½ XXZ chain in the presence of an impurity displays coherent (ballistic) spin transport at high temperature despite the fact that the model is quantum chaotic. Transport is studied on the nonequilibrium steady state, using a combination of tensor networks and open quantum system theory within Kubo’s linear response theory.

[Phys. Rev. B 98, 235128] Published Wed Dec 12, 2018

]]>The possibility of an inhomogeneous charge density wave phase is investigated in a system of two coupled electron and hole monolayers separated by a hexagonal boron nitride insulating layer. The charge-density-wave state is induced through the assumption of negative compressibility of electron/hole ...

[Phys. Rev. B 98, 245115] Published Wed Dec 12, 2018

]]>We present the appearance of nearly flat-band states with nonzero Chern numbers in a two-dimensional “diamond-octagon” lattice model comprising two kinds of elementary plaquette geometries, diamond and octagon, respectively. We show that the origin of such nontrivial topological nearly flat bands ca...

[Phys. Rev. B 98, 245116] Published Wed Dec 12, 2018

]]>At the microscopic level, individual spins in ferromagnets with random anisotropy tip transversely with distinct local angles relative to the magnetization $\stackrel{\u20d7}{M}$. When driven by an rf field along the equilibrium ${\stackrel{\u20d7}{M}}_{0}$, which changes $dM={\widehat{M}}_{0}\xb7d\stackrel{\u20d7}{M}$, the transverse tippings rotate about ${\stackrel{\u20d7}{M}}_{0}$, corresponding to a...

[Phys. Rev. B 98, 214415] Published Tue Dec 11, 2018

]]>We introduce a construction of symmetry-enriched topological orders on bipartite lattices in which two ${\mathbb{Z}}_{2}$ spin liquids defined on each sublattice are combined, and then anyons are condensed to reduce the topological order. By choosing different anyon condensate structures, one can vary the fractiona...

[Phys. Rev. B 98, 214416] Published Tue Dec 11, 2018

]]>Results are presented on analytic and computational analyses of the spin states associated with a three-dimensional (3D) fcc lattice composed of ABC stacked kagome planes of magnetic ions with only long-range dipole-dipole interactions. Extending previous work on the 2D kagome system, where a discre...

[Phys. Rev. B 98, 214417] Published Tue Dec 11, 2018

]]>We study the effect of site dilution in the Kitaev model. We derive an analytical solution of the dynamical spin correlation functions for arbitrary configurations of ${Z}_{2}$ fluxes. By incorporating this solution into a classical Monte Carlo scheme, we address how a site vacancy affects the experimental...

[Phys. Rev. B 98, 220404(R)] Published Tue Dec 11, 2018

]]>We recently proposed a high-pressure and high-temperature $P\overline{6}2m$-symmetry polymorph for ${\mathrm{CaF}}_{2}$ on the basis of *ab initio* random structure searching and density-functional theory calculations [J. R. Nelson *et al.*, Phys. Rev. B **95**, 054118 (2017)]. We revisit this polymorph using both *ab initio* and classi...

[Phys. Rev. B 98, 224105] Published Tue Dec 11, 2018

]]>We used temperature dependent high-resolution x-ray powder diffraction and magnetization measurements to investigate structural, magnetic and electronic degrees of freedom across the ferromagnetic magnetoelastic phase transition in $\mathrm{M}{\mathrm{n}}_{1}\mathrm{F}{\mathrm{e}}_{1}{\mathrm{P}}_{0.6-\mathrm{w}}\mathrm{S}{\mathrm{i}}_{0.4}{\mathrm{B}}_{\mathrm{w}}$ ($w=0$, 0.02, 0.04, 0.06, 0.08). The magnetic tran...

[Phys. Rev. B 98, 224413] Published Tue Dec 11, 2018

]]>A preponderance of evidence suggests that the ground state of the nearest-neighbor $S=1/2$ antiferromagnetic Heisenberg model on the kagome lattice is a gapless spin liquid. Many candidate materials for the realization of this model possess in addition a Dzyaloshinskii-Moriya (DM) interaction. We stud...

[Phys. Rev. B 98, 224414] Published Tue Dec 11, 2018

]]>Understanding the formation of Cooper pairs in iron-based superconductors is one of the most important topics in condensed matter physics. In conventional superconductors, the electron-phonon interaction leads to the formation of Cooper pairs. In conventional strong-coupling superconductors like lea...

[Phys. Rev. B 98, 224505] Published Tue Dec 11, 2018

]]>Using group theoretic and topological concepts, together with tunneling phenomena, we geometrically design interfacial wave networks that contain splitters which partition energy in two, three, four, or five directions. This enriches the valleytronics literature that has, so far, been limited to two...

[Phys. Rev. B 98, 235125] Published Tue Dec 11, 2018

]]>We describe square lattice spin liquids, which break time-reversal symmetry, while preserving translational symmetry. The states are distinguished by the manner in which they transform under mirror symmetries. All the states have nonzero scalar spin chirality, which implies the appearance of spontan...

[Phys. Rev. B 98, 235126] Published Tue Dec 11, 2018

]]>We demonstrate a general pole-zero method for the design of the scattering resonances of multilayered nanospheres, and we apply it to the relevant cases of strongly dispersive light scattering from metal-dielectric-metal and all-dielectric nanostructures. The pole-zero method is based on the full-wa...

[Phys. Rev. B 98, 235413] Published Tue Dec 11, 2018

]]>We studied the electronic, magnetic, and optical properties of $\beta \text{\u2212}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$ insulator within the density-functional theory using the generalized gradient approximation taking into account strong Coulomb correlations (GGA+$U$) in the framework of the fully relativistic spin-polarized Dirac linear muffin-t...

[Phys. Rev. B 98, 245113] Published Tue Dec 11, 2018

]]>We study phases of interacting Dirac matter that host Berry signatures. We predict a topological Lifshitz phase transition caused by the changes of a Dirac cone intersection from a semimetallic phase to helical insulating or metallic phases. These helical phases provide examples of a gapless topolog...

[Phys. Rev. B 98, 245114] Published Tue Dec 11, 2018

]]>We study the phase transitions induced by a lateral superlattice potential (a metallic grid) placed on top of a two-dimensional electron gas (2DEG) formed in a semiconductor quantum well. In a quantizing magnetic field and at filling factor $\nu =1,$ the ground state of the 2DEG depends on the strength ${V}_{\mathrm{...}}$

[Phys. Rev. B 98, 245306] Published Tue Dec 11, 2018

]]>Nitrogen vacancy (NV) centers in diamond have been identified over the past few years as promising systems for a variety of applications, ranging from quantum information science to magnetic sensing. This relies on the unique optical and spin properties of the negatively charged NV. Many of these ap...

[Phys. Rev. B 98, 245411] Published Tue Dec 11, 2018

]]>We present a theoretical study of the quantum critical behavior in heat transport via a two-state system with subohmic reservoirs. We calculate the temperature dependence of the thermal conductance near the quantum phase transition via the continuous-time quantum Monte Carlo method and discuss its c...

[Phys. Rev. B 98, 245412] Published Tue Dec 11, 2018

]]>Optical charge state switching was previously observed in photoluminescence experiments for the divacancy defect in $4H$-SiC. The participating dark charge state could not be identified with certainty. We use constrained density-functional theory to investigate the mechanism of charge state conversion...

[Phys. Rev. B 98, 214107] Published Mon Dec 10, 2018

]]>Resonant inelastic x-ray scattering (RIXS) is a promising technique for obtaining electron-phonon coupling constants. However, the ability to extract these coupling constants throughout the Brillouin zone for crystalline materials remains limited. To address this need, we developed a Green's functio...

[Phys. Rev. B 98, 214305] Published Mon Dec 10, 2018

]]>The magnetic specific heat of $\mathrm{RbFeS}{\mathrm{e}}_{2}$ and the spin state of $\mathrm{F}{\mathrm{e}}^{3+}$ ions in the compound have been studied. Phonon dispersion and phonon density of states (PDOS), element specific and total, were evaluated from first-principles calculations. It is shown that iron atoms in quasi-one-dimensional chains h...

[Phys. Rev. B 98, 214411] Published Mon Dec 10, 2018

]]>We have investigated the nature of the short-range magnetic phase region of ${\mathrm{Sr}}_{2-x}{\mathrm{La}}_{x}{\mathrm{IrO}}_{4}$ ($0\le x\le 0.14$). This so-called spin-orbit Mott insulator's predicted transition to superconductivity with electron doping has remained elusive. Instead, short-range magnetism prevails over an extensive doping range ...

[Phys. Rev. B 98, 214412] Published Mon Dec 10, 2018

]]>Chiral domain walls in ultrathin perpendicularly magnetized layers have a Néel structure stabilized by a Dzyaloshinskii-Moriya interaction (DMI) that is generated at the interface between the ferromagnet and a heavy metal. Different interface materials or properties are required above and below a fe...

[Phys. Rev. B 98, 214413] Published Mon Dec 10, 2018

]]>We use phenomenological symmetry arguments to demonstrate that while chiral magnetic (Dzyaloshinskii-Moriya) interactions are conventionally restricted by symmetry to appear in a limited set of noncentrosymmetric materials, they may arise in a material with any symmetry when coupled to a strain fiel...

[Phys. Rev. B 98, 214414] Published Mon Dec 10, 2018

]]>We report on the superconducting properties of noncentrosymmetric superconductor LaPtGe, which crystallizes in noncentrosymmetric $\alpha -{\mathrm{ThSi}}_{2}$ structure. The magnetization, resistivity, and specific-heat measurements confirm that LaPtGe is a type-II bulk superconductor with a transition temperature ${T}_{c}=\mathrm{3....}$

[Phys. Rev. B 98, 214505] Published Mon Dec 10, 2018

]]>When the electron density of highly crystalline thin films is tuned by chemical doping or ionic-liquid gating, interesting effects appear including unconventional superconductivity, sizable spin-orbit coupling, competition with charge-density waves, and a debated low-temperature metallic state that ...

[Phys. Rev. B 98, 214507] Published Mon Dec 10, 2018

]]>Eight years since the discovery of the binary antiferromagnetic (AFM) quasicrystal approximants $\mathrm{C}{\mathrm{d}}_{6}R$ [R. Tamura *et al.*, Phys. Rev. B **82**, 220201 (2010)], we report the observation of an AFM transition in quasicrystal approximants Au-Al-*R* ($R=\mathrm{Gd}$ and Tb), which represent examples of AFM in *ternary* quas...

[Phys. Rev. B 98, 220403(R)] Published Mon Dec 10, 2018

]]>Recent experiments show how a bilayer graphene twisted around a certain magic angle becomes superconducting as it is doped into a region with approximate flat bands. We investigate the mean-field $s$-wave superconducting state in such a system and show how the state evolves as the twist angle is tuned...

[Phys. Rev. B 98, 220504(R)] Published Mon Dec 10, 2018

]]>The origin of the structural phase transition of $\mathrm{TaT}{\mathrm{e}}_{2}$ has been investigated through the measurements of the temperature-dependent Raman spectroscopy and first-principles calculations. Based on the experimental and the calculation results, some interpretations are present. Firstly, abnormal redshift...

[Phys. Rev. B 98, 224104] Published Mon Dec 10, 2018

]]>We introduce a solvable model of driven fermions that elucidates the role of the localization transition in driven disordered magnets, as used in the context of dynamic nuclear polarization. Instead of spins, we study a set of noninteracting fermions that are coupled locally to nuclear spins and ten...

[Phys. Rev. B 98, 224202] Published Mon Dec 10, 2018

]]>Temperature rise ($\mathrm{\Delta}T$) associated with shear banding of metallic glasses is of great importance for their performance. However, experimental measurement of $\mathrm{\Delta}T$ is difficult due to temporal and spatial localization of shear bands and, as a result, our understanding of the mechanism of $\mathrm{\Delta}T$ is limited. He...

[Phys. Rev. B 98, 224203] Published Mon Dec 10, 2018

]]>We present a nonequilibrium quantum field theory approach to the initial-state dynamics of spin models based on two-particle irreducible (2PI) functional integral techniques. It employs a mapping of spins to Schwinger bosons for arbitrary spin interactions and spin lengths. At next-to-leading order ...

[Phys. Rev. B 98, 224304] Published Mon Dec 10, 2018

]]>${}^{55}\mathrm{Mn}$ and ${}^{27}\mathrm{Al}$ NMR measurements are performed on a single crystal of ${\mathrm{YMn}}_{4}{\mathrm{Al}}_{8}$, which is known as one of the rare examples of pseudogap opening in transition intermetallic compounds, to investigate the formation of this pseudogap. The NMR spectrum, Knight shift, linewidth, and spin-lattice relaxation r...

[Phys. Rev. B 98, 224412] Published Mon Dec 10, 2018

]]>We present experimental results for the in-plane resistivity of the electron-doped cuprate superconductor $\mathrm{L}{\mathrm{a}}_{2-x}\mathrm{C}{\mathrm{e}}_{x}\mathrm{Cu}{\mathrm{O}}_{4}$ above its transition temperature ${T}_{c}$ as a function of Ce doping $x$ and temperature. For the doping $x$ between 0.11 and 0.17, where ${T}_{c}$ varies from 30 K ($x=0.11$) to 5 K ($x=0.17$), we find...

[Phys. Rev. B 98, 224503] Published Mon Dec 10, 2018

]]>We study the static charge correlation function in a one-band model on a square lattice. The Hamiltonian consists of effective hoppings of the electrons between the lattice sites and the Heisenberg Hamiltonian. Approximating the irreducible charge correlation function by a single bubble yields the l...

[Phys. Rev. B 98, 224504] Published Mon Dec 10, 2018

]]>We derive a model for accurately reproducing the broadband infrared optical response of common engineering metals. Here we use “broadband infrared” to refer to wavelengths beginning at $1\phantom{\rule{0.28em}{0ex}}\mu \mathrm{m}$ and extending to approximately $100\phantom{\rule{0.28em}{0ex}}\mu \mathrm{m}$ or more. The model generalizes the Drude theory to account for sources of ...

[Phys. Rev. B 98, 235118] Published Mon Dec 10, 2018

]]>By means of the *first-principles* density functional theory ($\mathrm{DFT}+U$) calculations and experiments, we investigate the role of dilution on the structural, magnetic, electronic, and optical properties of the antiferromagnetic (AFM) spinel ${\mathrm{Co}}_{3}{\mathrm{O}}_{4}$ having Néel temperature $\left({T}_{\text{N}}\right)\sim 30$ K. As the octahedral cobalt...

[Phys. Rev. B 98, 235119] Published Mon Dec 10, 2018

]]>We study a three-orbital Hubbard model with negative Hund's coupling in infinite dimensions, combining dynamical mean-field theory with continuous time quantum Monte Carlo simulations. This model, which is relevant for the description of alkali-doped fullerides, has previously been shown to exhibit ...

[Phys. Rev. B 98, 235120] Published Mon Dec 10, 2018

]]>We consider symmetry-protected topological (SPT) phases in two dimensions protected by linear subsystem symmetries, i.e., those that act along rigid lines. There is a distinction between a “strong” subsystem SPT phase and a “weak” one, which is composed of decoupled one-dimensional SPTs with global ...

[Phys. Rev. B 98, 235121] Published Mon Dec 10, 2018

]]>The electronic stopping power of nickel for protons and alpha particles at velocities below and around the Fermi velocity has been obtained to high accuracy using time-dependent density functional theory. For the wide range of projectile velocities considered, we observed different regimes of electr...

[Phys. Rev. B 98, 235122] Published Mon Dec 10, 2018

]]>By analyzing the many-body problem for nonrelativistic electrons strongly coupled to photon modes of a microcavity I derive the exact momentum/force balance equation for cavity quantum electrodynamics. Implications of this equation for the electron self-energy and the exchange-correlation potential ...

[Phys. Rev. B 98, 235123] Published Mon Dec 10, 2018

]]>We investigate the new quantum phases on the extended Kane-Mele-Hubbard model of honeycomb lattice in the Hofstadter regime. In this regime, the orbital motion of the electrons can induce various topological phases with spontaneously broken symmetries when the spin-orbit coupling and electron correl...

[Phys. Rev. B 98, 235124] Published Mon Dec 10, 2018

]]>Incompressible even denominator fractional quantum Hall states at fillings $\nu =\pm \frac{1}{2}$ and $\nu =\pm \frac{1}{4}$ have been recently observed in monolayer graphene. We use a Chern-Simons description of multicomponent fractional quantum Hall states in graphene to investigate the properties of these states and suggest varia...

[Phys. Rev. B 98, 235411] Published Mon Dec 10, 2018

]]>Topological insulators are promising for spintronics and related technologies due to their spin-momentum-locked edge states, which are protected by time-reversal symmetry. In addition to the unique fundamental physics that arises in these systems, the potential technological applications of these pr...

[Phys. Rev. B 98, 235412] Published Mon Dec 10, 2018

]]>We measure microwave photocurrent in devices made from InAs/GaInSb bilayers where both the insulating bulk state and conducting edge state were observed in the inverted-band regime, consistent with the theoretical prediction for a quantum spin Hall (QSH) insulator. It has been theoretically proposed...

[Phys. Rev. B 98, 241301(R)] Published Mon Dec 10, 2018

]]>The quantum critical regimes (QCR) of both a two-dimensional (2D) disordered spin-$\frac{1}{2}$ antiferromagnet and a 2D clean dimerized quantum Heisenberg model are studied using the first-principles nonperturbative quantum Monte Carlo simulations. In particular, the three well-known universal coefficients as...

[Phys. Rev. B 98, 245111] Published Mon Dec 10, 2018

]]>In this paper, we present the numerical and experimental demonstration of asymmetric light transmission by a compact photonic crystal (PC) structure, which sustains semi-Dirac cone dispersion. The semi-Dirac point is obtained by exploiting plane-wave expansion method in a rectangular unit cell of a ...

[Phys. Rev. B 98, 245112] Published Mon Dec 10, 2018

]]>In the present work we explain the anomalous behavior of the attenuation of the longitudinal acoustic phonon in GaAs as a function of the phonon energy $\omega $ in the subterahertz domain. These attenuations along the [100] direction show a plateau between 0.6 and 1 GHz at low temperatures. We found an exc...

[Phys. Rev. B 98, 245201] Published Mon Dec 10, 2018

]]>We use tunneling spectroscopy to study the evolution of few-electron spin states in parallel InAs nanowire double quantum dots (QDs) as a function of level detuning and applied magnetic field. Compared to the much more studied serial configuration, parallel coupling of the QDs to source and drain gr...

[Phys. Rev. B 98, 245305] Published Mon Dec 10, 2018

]]>We present a microscopic theory of spin dynamics in weakly disordered graphene with uniform proximity-induced spin-orbit coupling (SOC). A time-dependent perturbative treatment is employed to derive the spin Bloch equations governing the spin dynamics at high electronic density for arbitrary ratio ${\lambda}_{\mathrm{...}}$

[Phys. Rev. B 98, 245408] Published Mon Dec 10, 2018

]]>Exchange-only spin qubits hosted in ${}^{28}\mathrm{Si}$-based triple quantum dots do not suffer from decoherence caused by randomly fluctuating nuclear-spin ensembles and can be relatively robust against electrical noise when operated at a sweet spot. Remaining sources of decoherence are qubit relaxation, leakage ...

[Phys. Rev. B 98, 245409] Published Mon Dec 10, 2018

]]>We investigate the effects of spin-orbit coupling on the optical response of materials. In particular, we study the effects of the commutator between the spin-orbit coupling part of the potential and the position operator on the optical matrix elements using density functional theory calculations wi...

[Phys. Rev. B 98, 245410] Published Mon Dec 10, 2018

]]>The known first-order orientational phase transition in pure ${\mathrm{C}}_{60}$ occurs at 260 K and is accompanied by the change from face-centered cubic $\left(Fm3m\right)$ to simple cubic unit cell $\left(Pa\overline{3}\right)$. While ${\mathrm{C}}_{60}$ molecules rotate freely above 260 K, they are fixed in inversion centers below 260 K. The phase transition in ...

[Phys. Rev. B 98, 214106] Published Fri Dec 07, 2018

]]>Advances in cold atomic systems have recently provided direct access to the rich physics of Anderson localization and nonequilibrium phenomena. Here, the authors revisit the canonical problem of an Anderson insulator in a spatially uniform, oscillating electric field, studied famously by Mott. They go beyond his linear response analysis by a combination of perturbation theory, Rabi oscillation theory, Landau-Zener tunneling ideas, and Floquet theory. They identify three qualitatively distinct regimes beyond Mott’s frequency-dependent hopping and present detailed numerical simulations verifying their properties.

[Phys. Rev. B 98, 214202] Published Fri Dec 07, 2018

]]>The average effective mass of charge carriers produced by an intense ultrashort laser pulse in a transparent solid increases significantly as the excitation mechanism changes from multiphoton transitions to interband tunneling. We theoretically investigate this phenomenon for several dielectrics and...

[Phys. Rev. B 98, 214304] Published Fri Dec 07, 2018

]]>Spins in molecular magnets can experience both anisotropic exchange interactions and on-site magnetic anisotropy. In this paper, we study the effect of exchange anisotropy on the molecular magnetic anisotropy both with and without on-site anisotropy. When both the anisotropies are small, we find tha...

[Phys. Rev. B 98, 214409] Published Fri Dec 07, 2018

]]>Measured switching voltage-field diagrams of perpendicular magnetic tunnel junctions exhibit unexpected behavior at high voltages associated with significant heating of the storage layer. The boundaries deviate from the critical lines corresponding to the coercive field, which contrasts with the the...

[Phys. Rev. B 98, 214410] Published Fri Dec 07, 2018

]]>We successfully synthesized a verdazyl-based charge-transfer salt $\left[o\text{\u2212}\mathrm{MePy}\text{\u2212}\mathrm{V}\text{\u2212}{\left(p\text{\u2212}\mathrm{Br}\right)}_{2}\right]{\mathrm{FeCl}}_{4}$, which has ${S}_{\mathrm{V}}=1/2$ on the radical $o\text{\u2212}\mathrm{MePy}\text{\u2212}\mathrm{V}\text{\u2212}{\left(p\text{\u2212}\mathrm{Br}\right)}_{2}$ and ${S}_{\mathrm{Fe}}=5/2$ on the ${\mathrm{FeCl}}_{4}$ anion. *Ab initio* molecular orbital calculations indicate the formation of an ${S}_{\mathrm{V}}=1/2$ honeycomb lattice composed of three types of exchan...

[Phys. Rev. B 98, 224411] Published Fri Dec 07, 2018

]]>We investigate the impact of introducing Majorana bound states, formed by a proximitized semiconducting nanowire in the topological regime, into a current biased capacitive Josephson junction, thereby adding delocalized states below the superconducting gap. We find that this qualitatively changes th...

[Phys. Rev. B 98, 224502] Published Fri Dec 07, 2018

]]>Response functions $\langle {\widehat{A}}_{x}\left(t\right){\widehat{B}}_{y}\left(0\right)\rangle $ for one-dimensional strongly correlated quantum many-body systems can be computed with matrix product state (MPS) techniques. Especially, when one is interested in spectral functions or dynamic structure factors of translation-invariant systems, the response for som...

[Phys. Rev. B 98, 235114] Published Fri Dec 07, 2018

]]>Recently, an anomalous generation of multiple plasmons with large spectral weight transfer in the visible to ultraviolet range (energies below the band gap) has been experimentally observed in the insulatinglike phase of oxygen-rich strontium niobium oxides (${\mathrm{SrNbO}}_{3+\delta}$). Here, we investigate the groun...

[Phys. Rev. B 98, 235115] Published Fri Dec 07, 2018

]]>The double exchange model describing the coupling between conduction electrons and localized magnetic moments is relevant for a large family of physical systems including manganites. Here we reveal that the one-dimensional double exchange model with an incommensurate magnetic elliptical spiral is a ...

[Phys. Rev. B 98, 235116] Published Fri Dec 07, 2018

]]>Thermodynamic and spectral properties of electrons coupled to quantum phonons are studied in the framework of the one-dimensional spinless Holstein model. Using quantum Monte Carlo simulations and an efficient exact estimator for the specific heat based on the properties of the perturbation expansio...

[Phys. Rev. B 98, 235117] Published Fri Dec 07, 2018

]]>Since the first observation of weak ferromagnetism in the charge-transfer salt $\kappa -{\left(\text{BEDT-}\mathrm{TTF}\right)}_{2}\text{Cu}\left[\mathrm{N}{\left(\mathrm{CN}\right)}_{2}\right]\text{Cl}$ [U. Welp *et al.*, Phys. Rev. Lett. **69**, 840 (1992)], no further evidence of a ferromagnetic state in this class of organic materials has been reported. Here, static and dynamic spin susceptibility ...

[Phys. Rev. B 98, 241202(R)] Published Fri Dec 07, 2018

]]>We study the role of excited phonon populations in the relaxation rates of nonequilibrium electrons using a nonequilibrium Green's function formalism. The transient modifications in the phononic properties are accounted for by self-consistently solving the Dyson equation for the electron and phonon ...

[Phys. Rev. B 98, 245110] Published Fri Dec 07, 2018

]]>We report on the observation of terahertz radiation induced photoconductivity and of terahertz analog of the microwave-induced resistance oscillations (MIRO) in HgTe-based quantum well (QW) structures of different width. The MIRO-like effect has been detected in QWs of 20 nm thickness with inverted ...

[Phys. Rev. B 98, 245304] Published Fri Dec 07, 2018

]]>We study an analytical model of a Rashba nanowire that is partially covered by and coupled to a thin superconducting layer, where the uncovered region of the nanowire forms a quantum dot. We find that, even if there is no topological superconducting phase possible, there is a trivial Andreev bound s...

[Phys. Rev. B 98, 245407] Published Fri Dec 07, 2018

]]>The effects of temperature and pressure on the phonons of GaN were calculated for both the wurtzite and zinc-blende structures. The quasiharmonic approximation (QHA) gave reasonable results for the temperature dependence of the phonon DOS at zero pressure but unreliably predicted the combined effect...

[Phys. Rev. B 98, 214105] Published Thu Dec 06, 2018

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