The dielectric properties of the prototypical frustrated ferromagnetic spin-chain compound ${\mathrm{PbCuSO}}_{4}\left(\mathrm{OH}\right){}_{2}$ known as linarite are studied across its strongly anisotropic magnetic phase diagram in single-crystal samples. The ferroelectric character of the principal low-field spin spiral phase is confirme…

[Phys. Rev. B 94, 214409] Published Fri Dec 09, 2016

]]>By means of first-principles calculations, we have systematically investigated how the magnetodynamic properties Gilbert damping, magnetization, and exchange stiffness are affected when permalloy (Py) (${\mathrm{Fe}}_{0.19}{\mathrm{Ni}}_{0.81}$) is doped with $4d$ or $5d$ transition metal impurities. We find that the trends in the G…

[Phys. Rev. B 94, 214410] Published Fri Dec 09, 2016

]]>We study superconducting instability from orbital nematic fluctuations in a minimal model consisting of the ${d}_{xz}$ and ${d}_{yz}$ orbitals, and choose model parameters which capture the typical Fermi surface geometry observed in iron-based superconductors. We solve the Eliashberg equations down to low tempera…

[Phys. Rev. B 94, 214505] Published Fri Dec 09, 2016

]]>Mobile impurities in cold atomic gases constitute a new platform for investigating polaron physics. Here we show that when impurity atoms interact with a two-dimensional Fermi gas with quadratic band touching, the polaron picture may either hold or break down depending on the particle-hole asymmetry…

[Phys. Rev. B 94, 220302(R)] Published Fri Dec 09, 2016

]]>We consider anisotropic long-range interacting spin systems in $d$ dimensions. The interaction between the spins decays with the distance as a power law with different exponents in different directions: We consider an exponent ${d}_{1}+{\sigma}_{1}$ in ${d}_{1}$ directions and another exponent ${d}_{2}+{\sigma}_{2}$ in the remaining ${d}_{2}\equiv d-{d}_{1}$ …

[Phys. Rev. B 94, 224411] Published Fri Dec 09, 2016

]]>The pseudogap (PG) derived from the analysis of the excess conductivity ${\sigma}^{\prime}\left(T\right)$ in superlattices and double-layer films of ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{7-\delta}{\text{-PrBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{7-\delta}$ (YBCO-PrBCO), prepared by pulsed laser deposition, is studied for the first time. The ${\sigma}^{\prime}\left(T\right)$ analysis has been performed within the local-pair (LP) model b…

[Phys. Rev. B 94, 224505] Published Fri Dec 09, 2016

]]>We present low temperature resistivity and magnetotransport measurements conducted on pristine and electron doped ${\mathrm{SmNiO}}_{3}$ (SNO). The low temperature transport in both pristine and electron-doped SNO shows a Mott variable range hopping with a substantial decrease in localization length of carriers by …

[Phys. Rev. B 94, 235124] Published Fri Dec 09, 2016

]]>Electron spin relaxation in bulk cubic GaN is investigated by time-resolved magneto-optical spectroscopy over a wide range of temperatures, external magnetic fields, and doping densities. Very long spin relaxation times in the nanosecond range are found even up to room temperature, making cubic GaN a highly interesting material for spintronics. These results on a system with relatively weak spin-orbit coupling differ significantly from previous results for bulk III-V semiconductors such as GaAs. There are several possible reasons for the observed discrepancy, including the role of charged dislocations and a phase mixture of cubic GaN with inclusions of hexagonal GaN. Spin relaxation in such disordered materials is still poorly understood, and so this work should stimulate further research on this relevant topic.

[Phys. Rev. B 94, 235202] Published Fri Dec 09, 2016

]]>We generalize the hierarchical equations of motion method to study electron transport through a quantum dot or molecule coupled to one-dimensional interacting leads that can be described as Luttinger liquids. Such leads can be realized, for example, by quantum wires or fractional quantum Hall edge s…

[Phys. Rev. B 94, 235411] Published Fri Dec 09, 2016

]]>We study the mass transport dynamics of an adsorbed layer near a discontinuous incommensurate striped-honeycomb phase transition via numerical simulations of a coarse-grained model focusing on the motion of domain walls rather than individual atoms. Following an initial step profile created in the i…

[Phys. Rev. B 94, 235412] Published Fri Dec 09, 2016

]]>Using the tight-binding model, we investigate the influence of vacancy disorder on electrical transport in graphene Hall bars in the presence of quantizing magnetic fields. Disorder, induced by a random distribution of monovacancies, breaks the graphene sublattice symmetry and creates states localiz…

[Phys. Rev. B 94, 235413] Published Fri Dec 09, 2016

]]>The single-impurity Anderson model is studied within the i-DFT framework, a recently proposed extension of density functional theory (DFT) for the description of electron transport in the steady state. i-DFT is designed to give both the steady current and density at the impurity, and it requires the…

[Phys. Rev. B 94, 241103(R)] Published Fri Dec 09, 2016

]]>We utilize nonlinear absorption to design all-optical protocols that improve both charge-state initialization and spin readout for the nitrogen-vacancy (NV) center in diamond. Nonmonotonic variations in the equilibrium charge state as a function of visible and near-infrared optical power are attribu…

[Phys. Rev. B 94, 241201(R)] Published Fri Dec 09, 2016

]]>We employ equation-of-motion techniques to study the nonequilibrium dynamics in a lattice model of weakly interacting spinless fermions. Our model provides a simple setting for analyzing the effects of weak integrability-breaking perturbations on the time evolution after a quantum quench. We establi…

[Phys. Rev. B 94, 245117] Published Fri Dec 09, 2016

]]>The phonovoltaic cell harvests optical phonons like a photovoltaic harvests photons, that is, a nonequilibrium (hot) population of optical phonons (at temperature ${T}_{p,\mathrm{O}}$) more energetic than the band gap produces electron-hole pairs in a $p\text{\u2212}n$ junction, which separates these pairs to produce power. A ph…

[Phys. Rev. B 94, 245412] Published Fri Dec 09, 2016

]]>Pressure and shear strain-induced phase transformations (PTs) in a nanograined bicrystal at the evolving dislocations pile-up have been studied utilizing a phase field approach (PFA). The complete system of PFA equations for coupled martensitic PT, dislocation evolution, and mechanics at large strai…

[Phys. Rev. B 94, 214104] Published Thu Dec 08, 2016

]]>We study a class of periodically driven $d$-dimensional integrable models and show that after $n$ drive cycles with frequency $\omega $, pure states with non-area-law entanglement entropy ${S}_{n}\left(l\right)\sim {l}^{\alpha (n,\omega )}$ are generated, where $l$ is the linear dimension of the subsystem, and $d-1\le \alpha (n,\omega )\le d$. The exponent $\alpha (n,\omega )$ eventua…

[Phys. Rev. B 94, 214301] Published Thu Dec 08, 2016

]]>We have performed the detailed investigations of the magnetization of the $S=\frac{1}{2}$ triangular-lattice antiferromagnets ${\mathrm{Ba}}_{3}{\mathrm{CoSb}}_{2}{\mathrm{O}}_{9}$ and ${\mathrm{CsCuCl}}_{3}$ with a ${120}^{\circ}$ spin structure in the $ab$ plane. In ${\mathrm{Ba}}_{3}{\mathrm{CoSb}}_{2}{\mathrm{O}}_{9}$, the magnetic susceptibility ($\chi $) exhibits a broad maximum above the Néel temperature (${T}_{\mathrm{N}}$) as is expected…

[Phys. Rev. B 94, 214408] Published Thu Dec 08, 2016

]]>We analyze Cooper pairing instabilities in strongly driven electron-phonon systems. The light-induced nonequilibrium state of phonons results in a simultaneous increase of the superconducting coupling constant and the electron scattering. We demonstrate that the competition between these effects lea…

[Phys. Rev. B 94, 214504] Published Thu Dec 08, 2016

]]>[Phys. Rev. B 94, 219901] Published Thu Dec 08, 2016

]]>We propose a scheme which can generate a highly directional single photon with almost 100% efficiency. Therefore we can get a useful single photon when it is required. An initial excited atom is placed inside a special Fabry-Pérot cavity whose walls consist of left-handed and zero-index metamaterial…

[Phys. Rev. B 94, 220103(R)] Published Thu Dec 08, 2016

]]>Lattice vibrations in ${\mathrm{CH}}_{3}{\mathrm{NH}}_{3}{\mathrm{PbI}}_{3}$ are strongly interacting, with double-well instabilities present at the Brillouin zone boundary. Analysis within a first-principles lattice-dynamics framework reveals anharmonic potentials with short phonon quasiparticle lifetimes and mean free paths. The phonon beha…

[Phys. Rev. B 94, 220301(R)] Published Thu Dec 08, 2016

]]>An aspect of a magnetic vortex whose dynamics strongly affects the magnetic structures of the environment is experimentally shown. We exploit a nanodot of an exchange-coupled bilayer with a soft magnetic $\mathrm{N}{\mathrm{i}}_{81}\mathrm{F}{\mathrm{e}}_{19}$ [permalloy (Py)] having a magnetic vortex and a perpendicularly magnetized $L{1}_{0}\text{\u2212}\mathrm{FePt}$ exh…

[Phys. Rev. B 94, 220401(R)] Published Thu Dec 08, 2016

]]>${\mathrm{Cu}}_{2}{\mathrm{ZnSnS}}_{4}$ (CZTS) is a promising material as an absorber in photovoltaic applications. The measured efficiency, however, is far from the theoretically predicted value for the known CZTS phases. To improve the understanding of this discrepancy, we investigate the structural, dynamical, and dielectric …

[Phys. Rev. B 94, 224302] Published Thu Dec 08, 2016

]]>We report extraordinarily large magnetic hysteresis loops in the iridates ${\mathrm{Sr}}_{3}{\mathrm{NiIrO}}_{5}$ and ${\mathrm{Sr}}_{3}{\mathrm{CoIrO}}_{6}$. We find coercive magnetic fields of up to 55 T with switched magnetic moments $\approx 1\phantom{\rule{0.28em}{0ex}}{\mu}_{\mathrm{B}}$ per formula unit in ${\mathrm{Sr}}_{3}{\mathrm{NiIrO}}_{6}$ and coercive fields of up to 52 T with switched moments $\approx 3\phantom{\rule{0.28em}{0ex}}{\mu}_{\mathrm{B}}$ per formula unit in ${\mathrm{Sr}}_{3}{\mathrm{CoIr\dots}}_{}$

[Phys. Rev. B 94, 224408] Published Thu Dec 08, 2016

]]>Bogoliubov transformations have been successfully applied in several condensed-matter contexts, e.g., in the theory of superconductors, superfluids, and antiferromagnets. These applications are based on bulk models where translation symmetry can be assumed, so that few degrees of freedom in Fourier …

[Phys. Rev. B 94, 224409] Published Thu Dec 08, 2016

]]>We experimentally demonstrate magnon Kerr effect in a cavity-magnon system where magnons in a small yttrium iron garnet (YIG) sphere are strongly but dispersively coupled to the photons in a three-dimensional cavity. When the YIG sphere is pumped to generate considerable magnons, the Kerr effect yie…

[Phys. Rev. B 94, 224410] Published Thu Dec 08, 2016

]]>In this study, current pumping by an external potential is studied on the basis of the Keldysh Green's function method, and a pumping formula written in terms of retarded and advanced Green's functions is obtained. It is shown that pumping is essentially driven by a change of particle distribution b…

[Phys. Rev. B 94, 224412] Published Thu Dec 08, 2016

]]>Recent photoemission experiments [1] reveal that the excitations along the nodal region in the strange metal phase of the cuprates, rather than corresponding to poles in the single-particle Green function, exhibit power-law scaling as a function of frequency and temperature. Because such power-law s…

[Phys. Rev. B 94, 235121] Published Thu Dec 08, 2016

]]>Many phases of matter, including superconductors, fractional quantum Hall fluids, and spin liquids, are described by gauge theories with constrained Hilbert spaces. However, thermalization and the applicability of quantum statistical mechanics has primarily been studied in unconstrained Hilbert spac…

[Phys. Rev. B 94, 235122] Published Thu Dec 08, 2016

]]>We show that under the effect of an external magnetic field, a photogalvanic effect and the generation of a second harmonic wave can be induced in inversion symmetric and time-reversal invariant Dirac semimetals and it is linear with the magnetic field. The mechanisms responsible for these nonlinear…

[Phys. Rev. B 94, 235123] Published Thu Dec 08, 2016

]]>The preadsorption of Ag on Si(111) drastically changes the growth of Ge. In a temperature range from $400{\phantom{\rule{0.16em}{0ex}}}^{\circ}\mathrm{C}$ to $650{\phantom{\rule{0.16em}{0ex}}}^{\circ}\mathrm{C}$, Ag adsorption on Si leads to the formation of a $\sqrt{3}\times \sqrt{3}$-R ${30}^{\circ}$ reconstruction that exhibits a maze-like morphology on the mesoscopic scale, as observed by low-energy electron diffraction (…

[Phys. Rev. B 94, 235410] Published Thu Dec 08, 2016

]]>We study *ab initio* a pyrochlore compound, ${\mathrm{CsW}}_{2}{\mathrm{O}}_{6}$, which exhibits a yet unexplained metal-insulator transition. We find that (1) the reported low-$T$ structure is likely inaccurate and the correct structure has a twice larger cell; (2) the insulating phase is not of a Mott or dimer-singlet nature, but …

[Phys. Rev. B 94, 241101(R)] Published Thu Dec 08, 2016

]]>We investigate the interplay of many-body and band-structure effects of interacting Weyl semimetals (WSMs). Attractive and repulsive Hubbard interactions are studied within a model for a time-reversal-breaking WSM with tetragonal symmetry, where we can approach the limit of weakly coupled planes and…

[Phys. Rev. B 94, 241102(R)] Published Thu Dec 08, 2016

]]>We present an extension of the functional renormalization group to Floquet space, which enables us to treat the long time behavior of interacting time periodically driven quantum dots. It is one of its strength that the method is neither bound to small driving amplitudes nor to small driving frequen…

[Phys. Rev. B 94, 245116] Published Thu Dec 08, 2016

]]>Employing a low-temperature growth mode, we fabricated ultrathin $\mathrm{S}{\mathrm{i}}_{1-x}\mathrm{G}{\mathrm{e}}_{x}$/Si multiple quantum well structures with a well thickness of less than 1.5 nm and a Ge concentration above 60% directly on a Si substrate. We identified an unusual temperature-dependent blueshift of the photoluminescence (PL) …

[Phys. Rev. B 94, 245304] Published Thu Dec 08, 2016

]]>We present diffuse x-ray scattering data on the strong negative thermal expansion (NTE) material ${\mathrm{ScF}}_{3}$ and find that two-dimensional nanoscale correlations exist at momentum-space regions associated with possibly rigid rotations of the perovskite octahedra. We address the extent to which rigid octahe…

[Phys. Rev. B 94, 214102] Published Wed Dec 07, 2016

]]>We report a Raman scattering study of six rare-earth orthoferrites $R{\mathrm{FeO}}_{3}$, with $R$ = La, Sm, Eu, Gd, Tb, Dy. The use of extensive polarized Raman scattering of ${\mathrm{SmFeO}}_{3}$ and first-principles calculations enable the assignment of the observed phonon modes to vibrational symmetries and atomic displacements…

[Phys. Rev. B 94, 214103] Published Wed Dec 07, 2016

]]>We report a neutron diffraction study of the multiferroic mechanism in ${\left({\mathrm{ND}}_{4}\right)}_{2}{\mathrm{FeCl}}_{5}\xb7{\mathrm{D}}_{2}\mathrm{O}$, a molecular compound that exhibits magnetically induced ferroelectricity. This material exhibits two successive magnetic transitions on cooling: a long-range order transition to an incommensurate (IC) collinear s…

[Phys. Rev. B 94, 214405] Published Wed Dec 07, 2016

]]>$\mathrm{GeC}{\mathrm{u}}_{2}{\mathrm{O}}_{4}$ spinel exhibits a tetragonal structure due to the strong Jahn-Teller distortion associated with $\mathrm{C}{\mathrm{u}}^{2+}$ ions. We show that its magnetic structure can be described as slabs composed of a pair of layers with orthogonally oriented spin-$\frac{1}{2}$ Cu chains in the basal $ab$ plane. The spins between the two …

[Phys. Rev. B 94, 214406] Published Wed Dec 07, 2016

]]>Neutron scattering from single crystals has been used to determine the magnetic structure and magnon dynamics of ${\text{FePS}}_{3}$, an $S=2$ Ising-like quasi-two-dimensional antiferromagnet with a honeycomb lattice. The magnetic structure has been confirmed to have a magnetic propagation vector of ${\mathbf{k}}_{M}=\left[01\frac{1}{2}\right]$ and the…

[Phys. Rev. B 94, 214407] Published Wed Dec 07, 2016

]]>We present an angular-dependent magnetotunneling technique, which facilitates unambiguous separation of superconducting (supporting circulating screening currents) and nonsuperconducting (not supporting screening currents) contributions to the pseudogap phenomenon in layered ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{CaCu}}_{2}{\mathrm{O}}_{8+\delta}$ cuprates…

[Phys. Rev. B 94, 220501(R)] Published Wed Dec 07, 2016

]]>Inelastic neutron scattering combined with the dynamic pair density function (DPDF) analysis were used to investigate the magnetic and lattice dynamics in the orbitally active ${\mathrm{Y}}_{1-x}{\mathrm{La}}_{x}{\mathrm{TiO}}_{3}$ as it crosses the antiferromagnetic (AFM) to ferromagnetic (FM) phase boundary. Upon doping, the FM state presen…

[Phys. Rev. B 94, 224301] Published Wed Dec 07, 2016

]]>Rare-earth intermetallics play a critical yet often obscure role in numerous technological applications, including sensors, actuators, permanent magnets, and rechargeable batteries; therefore, understanding their basic science is of utmost importance. Here we report structural behaviors, specific he…

[Phys. Rev. B 94, 224406] Published Wed Dec 07, 2016

]]>We have performed micromagnetic simulations of low-amplitude gyrotropic dynamics of magnetic vortices in the presence of spatially uniform out-of-plane magnetic fields. For disks having small lateral dimensions, we observe a frequency drop-off when approaching the disk's out-of-plane saturation fiel…

[Phys. Rev. B 94, 224407] Published Wed Dec 07, 2016

]]>Superconducting properties change in confined geometries. Here we study the effects of strong confinement in nanosized Pb islands on Si(111) $7\times 7$. Small hexagonal islands with diameters less than 50 nm and a uniform height of seven atomic layers are formed by depositing Pb at low temperature and anne…

[Phys. Rev. B 94, 224504] Published Wed Dec 07, 2016

]]>Quantum Monte Carlo (QMC) methods are one of the most important tools for studying interacting quantum many-body systems. The vast majority of QMC calculations in interacting fermion systems require a constraint to control the sign problem. The constraint involves an input trial wave function which …

[Phys. Rev. B 94, 235119] Published Wed Dec 07, 2016

]]>We report on magnetotransport properties of the Kondo semiconducting compound ${\mathrm{CeRu}}_{2}{\mathrm{Al}}_{10}$, focusing on its exotic phase below ${T}_{0}=27$ K. An excess thermal conductivity $\kappa $ emerges below ${T}_{0}$ and is gradually suppressed by magnetic field, strikingly resembling those observed in the hidden-order phase of ${\mathrm{URu}}_{2}{\dots}_{}$

[Phys. Rev. B 94, 235120] Published Wed Dec 07, 2016

]]>Photoabsorption spectra by circular polarized light in transition-metal dichalcogenides are calculated as a function of laser excitation energy. Although the 100% valley polarization occurs at the $K$ point of the Brillouin zone, the difference of the absorption intensity for left-handed and right-han…

[Phys. Rev. B 94, 235408] Published Wed Dec 07, 2016

]]>Since the quantum anomalous Hall (QAH) effect was realized in magnetic topological insulators, research on the effect has become a hot topic. The very harsh realizing requirements of the effect in experiments, however, hinder its practical applications. Based on *ab initio* methods, we find that nonma…

[Phys. Rev. B 94, 235409] Published Wed Dec 07, 2016

]]>Advanced semiempirical calculations have been performed to compute simultaneously optical absorption and $K$ pre-edge x-ray absorption spectra of ${\mathrm{Fe}}^{2+}$ in four distinct site symmetries found in minerals. The four symmetries, i.e., a distorted octahedron, a distorted tetrahedron, a square planar site, a…

[Phys. Rev. B 94, 245115] Published Wed Dec 07, 2016

]]>Samples of few-layer phosphorene can be produced by mechanical or liquid exfoliation. However, it remains challenging to produce flakes with large sizes. Optical spectroscopy performed on phosphorene has revealed a peculiar gap dependence that is roughly inversely proportional to the layer number. This dependence has been poorly understood to date. Because of their small size, these samples have been out of reach of powerful electronic structure characterization techniques such as angle-resolved photoemission (ARPES). The present work shows how to get a handle on the experimental band structure of few-layer black phosphorus. The authors conjecture that the bulk black phosphorous crystal already provides all the necessary information regarding the electronic structure of few-layer phosphorene. They perform ARPES measurements of the bulk crystal to fit to an experimental tight-binding model. Then, they apply the zone-folding method to the three-dimensional electronic dispersion. By quantizing the electron wavevector component perpendicular to the layers, they are able to not only extract reliable band structure data for few-layer phosphorene from the bulk band structure but also to fully explain the peculiar band-gap dependence. In particular, the band gaps as predicted by zone-folding are in excellent agreement with optical experiments and $a\phantom{\rule{0}{0ex}}b$ $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations.

[Phys. Rev. B 94, 245410] Published Wed Dec 07, 2016

]]>We present *ab initio* calculations of uniaxial absolute deformation potentials of the valence and the conduction bands in monolayer ${\mathrm{MoS}}_{2},{\mathrm{MoSe}}_{2},{\mathrm{WS}}_{2},{\mathrm{WSe}}_{2}$, h-BN, and phosphorene. Calculations are performed using both semilocal and hybrid functionals. The absolute positions of the band edges in strained …

[Phys. Rev. B 94, 245411] Published Wed Dec 07, 2016

]]>We explore the physics of a Chern insulator subjected to a two-step Floquet drive. We analytically obtain the phase diagram and show that the system can exhibit different topological phases characterized by the presence and chirality of edge modes in the two bulk gaps of the Floquet quasienergy spec…

[Phys. Rev. B 94, 214203] Published Tue Dec 06, 2016

]]>The frustration of magnetization and conductivity properties of ultrathin manganite is detrimental to their device performance, preventing their scaling down process. Here we demonstrate that the magnetism of ultrathin $\mathrm{LaMn}{\mathrm{O}}_{3}$ films can be restored by a $\mathrm{SrTi}{\mathrm{O}}_{3}$ capping layer, which engineers the surfa…

[Phys. Rev. B 94, 214404] Published Tue Dec 06, 2016

]]>Recent experiments on ice formed by water under nanoconfinement provide evidence for a two-dimensional (2D) “square ice” phase. However, the interpretation of the experiments has been questioned and the stability of square ice has become a matter of debate. Partially this is because the simulation a…

[Phys. Rev. B 94, 220102(R)] Published Tue Dec 06, 2016

]]>We propose a spectroscopic method to identify the nodal gap structure in unconventional superconductors. This method is best suited for locating the horizontal line node and for pinpointing the isolated point nodes by measuring polar angle $\left(\theta \right)$ resolved zero-energy density of states $N\left(\theta \right)$. This is mea…

[Phys. Rev. B 94, 224503] Published Tue Dec 06, 2016

]]>Recent studies show superconductivity provides new perspectives on spintronics. We study a heterostructure composed of an $s$-wave superconductor and a cubic chiral magnet that stabilizes a topological spin texture, a skyrmion. We propose a supercurrent-induced spin torque, which originates from the s…

[Phys. Rev. B 94, 235117] Published Tue Dec 06, 2016

]]>We perform quantum Monte Carlo simulations of the itinerant-localized periodic Kondo-Heisenberg model for the underdoped cuprates to calculate the associated spin correlation functions. The strong electron correlations are shown to play a key role in the abrupt destruction of the quasi-long-range an…

[Phys. Rev. B 94, 235118] Published Tue Dec 06, 2016

]]>We present Auger-electron-detected magnetic resonance (AEDMR) experiments on phosphorus donors in silicon, where the selective optical generation of donor-bound excitons is used for the electrical detection of the electron spin state. Because of the long dephasing times of the electron spins in isot…

[Phys. Rev. B 94, 235201] Published Tue Dec 06, 2016

]]>We predict that a strong nonreciprocity in the resonance spectra of Dirac quantum dots can be induced by the Berry phase. The nonreciprocity arises in relatively weak magnetic fields and is manifest in anomalously large field-induced splittings of quantum dot resonances which are degenerate at $B=0$ d…

[Phys. Rev. B 94, 235406] Published Tue Dec 06, 2016

]]>We build a tight-binding Hamiltonian describing Co/Ni over graphene, contemplating ATOP (a Co/Ni atom on top of each carbon atom of one graphene sublattice) and HCP (one Co/Ni atom per graphene plaquette) configurations. For the ATOP configuration the orbitals involved, for the Co/Ni, are the ${d}_{{z}^{2}-{r}^{2}}$…

[Phys. Rev. B 94, 235407] Published Tue Dec 06, 2016

]]>The Boolean algebra is the natural theoretical framework for a classical information treatment. The basic logical operations are usually performed using logic gates. In this Rapid Communication we demonstrate that not, or, and and gates can be realized exploiting the near-field radiative interaction…

[Phys. Rev. B 94, 241401(R)] Published Tue Dec 06, 2016

]]>We study the electron-electron interaction effects on topological phase transitions by the *ab initio* quantum Monte Carlo simulation. We analyze two-dimensional class A topological insulators and three-dimensional Weyl semimetals with the long-range Coulomb interaction. The direct computation of the …

[Phys. Rev. B 94, 245112] Published Tue Dec 06, 2016

]]>We investigated the electronic structure of $[{\left(\mathrm{SrIr}{\mathrm{O}}_{3}\right)}_{m},(\mathrm{SrTi}{\mathrm{O}}_{3}\left)\right](m=\phantom{\rule{0.16em}{0ex}}1,\phantom{\rule{0.16em}{0ex}}2,\mathrm{and}\phantom{\rule{0.16em}{0ex}}\infty )$ superlattice (SL) thin films with optical spectroscopy and first principles calculations. Our optical results confirmed the existence of the ${J}_{\mathrm{eff}}=1/2$ states in SL samples, similar to the bulk Ruddlesden-Popper series $\mathrm{S}{{\mathrm{r}}_{n}}_{+1}\mathrm{I}{\mathrm{\dots}}_{}$

[Phys. Rev. B 94, 245113] Published Tue Dec 06, 2016

]]>We use a nonequilibrium implementation of the dynamical cluster approximation (DCA) to study the effect of short-range correlations on the dynamics of the two-dimensional Falicov-Kimball model after an interaction quench. As in the case of single-site dynamical mean-field theory, thermalization is a…

[Phys. Rev. B 94, 245114] Published Tue Dec 06, 2016

]]>In this work we put forward a first-principles approach and propose an accurate diagrammatic approximation to calculate the time-resolved (TR) and angle-resolved photoemission spectrum of systems with excitons. We also derive an alternative formula to the TR photocurrent which involves a single time…

[Phys. Rev. B 94, 245303] Published Tue Dec 06, 2016

]]>We have studied the role of spin-dependent processes on conductivity in polyfluorene (PFO) thin films by preforming continuous wave (cw) electrically detected magnetic resonance (EDMR) spectroscopy at temperatures between 10 K and room temperature using microwave frequencies between about 1 GHz and …

[Phys. Rev. B 94, 214202] Published Mon Dec 05, 2016

]]>We examine the pair entanglement in the ground state of finite dimerized spin-$s$ chains interacting through anisotropic $XY$ couplings immersed in a transverse magnetic field by means of a self-consistent pair mean-field approximation. The approach, which makes no *a priori* assumptions on the pair state…

[Phys. Rev. B 94, 214403] Published Mon Dec 05, 2016

]]>The external controllability of topological superconductors and Majorana fermions would be important both for fundamental and practical interests. Here we predict the electric-field control of Majorana fermions in two-dimensional topological superconductors utilizing a topological insulator thin-fil…

[Phys. Rev. B 94, 214502] Published Mon Dec 05, 2016

]]>We report recent investigations into the transition to turbulence in superfluid ${}^{4}\mathrm{He}$, realized experimentally by measuring the drag forces acting on two custom-made quartz tuning forks with fundamental resonances at 6.5 kHz and 55.5 kHz, in the temperature range 10 mK to 2.17 K. In pure superfluid in…

[Phys. Rev. B 94, 214503] Published Mon Dec 05, 2016

]]>The Weyl semimetals are topologically protected from a gap opening against weak disorder in three dimensions. However, a strong disorder drives this relativistic semimetal through a quantum transition towards a diffusive metallic phase characterized by a finite density of states at the band crossing…

[Phys. Rev. B 94, 220201(R)] Published Mon Dec 05, 2016

]]>Weyl nodes, the essential low-energy theory of Weyl semimetals, are theoretically predicted to show a novel type of disorder-driven quantum phase transition. At a critical disorder strength, the system passes from a semimetal phase to a diffusive metal phase. Crucially, these theoretical predictions rest on the assumption that the disorder is of potential type, i.e., a spatially modulated energy offset for the two bands crossing at the Weyl node. However, there is no symmetry reason restricting realistic disorder to the potential case. In this Rapid Communication, the authors generalize the above setup to include generic spatially dependent couplings of the two bands, which can be interpreted as a random vector potential. Using a variety of analytical and numerical methods, the authors discover a phase diagram controlled by the number of independent components of the disorder vector. Surprisingly, no phase transition into a diffusive metal phase could be found for disorder of the single Pauli-matrix type. In contrast, all other forms of vector disorder are capable of driving a transition.

[Phys. Rev. B 94, 220202(R)] Published Mon Dec 05, 2016

]]>This study aims to unravel the mechanism of colossal magnetoresistance (CMR) observed in $n\text{\u2212}\mathrm{type}{\mathrm{HgCr}}_{2}{\mathrm{Se}}_{4}$, in which low-density conduction electrons are exchange-coupled to a three-dimensional Heisenberg ferromagnet with a Curie temperature ${T}_{C}\approx 105$ K. Near room temperature the electron transport exhib…

[Phys. Rev. B 94, 224404] Published Mon Dec 05, 2016

]]>The evolution of the structural and magnetic properties of Co doped ZnO has been investigated over an unprecedented concentration range above the coalescence limit. ZnO films with Co concentrations from 20% to 60% of the cationic lattice have been grown by reactive magnetron sputtering. The wurtzite…

[Phys. Rev. B 94, 224405] Published Mon Dec 05, 2016

]]>We have performed transverse-field muon spin relaxation measurements on ambient-pressure-grown polycrystalline $\mathrm{La}{\mathrm{O}}_{0.5}{\mathrm{F}}_{0.5}{\mathrm{BiS}}_{2}$. From these measurements, no signature of magnetic order is found down to 25 mK. The value of the magnetic penetration depth extrapolated to 0 K is 0.89 (5) $\mu \mathrm{m}$. The temperatu…

[Phys. Rev. B 94, 224502] Published Mon Dec 05, 2016

]]>We analyze the highly nonperturbative regime surrounding the Mott-Hubbard metal-to-insulator transition (MIT) by means of dynamical mean field theory (DMFT) calculations at the two-particle level. By extending the results of Schäfer *et al.* [Phys. Rev. Lett. **110**, 246405 (2013)] we show the existence …

[Phys. Rev. B 94, 235108] Published Mon Dec 05, 2016

]]>We calculate the photoluminescence spectrum of a single semiconductor quantum dot strongly coupled to a continuum as a function of light frequency, gate voltage, and magnetic field. The spectrum is dominated by the recombination of several excitonic states which can be considered as quantum quenches…

[Phys. Rev. B 94, 235109] Published Mon Dec 05, 2016

]]>A generalized version of the fidelity susceptibility of single-band and multiorbital Hubbard models is systematically studied using single-site dynamical mean-field theory in combination with a hybridization expansion continuous-time quantum Monte Carlo impurity solver. We find that the fidelity sus…

[Phys. Rev. B 94, 235110] Published Mon Dec 05, 2016

]]>Dirac points in two-dimensional electronic structures are a source for topological electronic states due to the $\pm \pi $ Berry phase that they sustain. Here we show that two rutile multilayers [namely ${\left({\mathrm{WO}}_{2}\right)}_{2}/{\left({\mathrm{ZrO}}_{2}\right)}_{n}$ and ${\left({\mathrm{PtO}}_{2}\right)}_{2}/{\left({\mathrm{ZrO}}_{2}\right)}_{n}$], where an active bilayer is sandwiched by a thick enough ($n=6$ is suff…

[Phys. Rev. B 94, 235111] Published Mon Dec 05, 2016

]]>We analyze the linear thermoelectric transport properties of devices with three quantum dots in a star configuration. A central quantum dot is tunnel-coupled to source and drain electrodes and to two additional quantum dots. For a wide range of parameters, in the absence of an external magnetic fiel…

[Phys. Rev. B 94, 235112] Published Mon Dec 05, 2016

]]>Can topological quantum entanglement between anyons in one topological medium “stray” into a different, topologically distinct medium? In other words, can quantum information encoded nonlocally in the combined state of non-Abelian anyons be shared between two distinct topological media? For one-dime…

[Phys. Rev. B 94, 235113] Published Mon Dec 05, 2016

]]>We study the properties of dipolar wave propagation in linear chains of isotropic particles with independent electric and magnetic response, embedded in vacuum. It is shown that the chain can support simultaneously right-handed modes (RHMs) and left-handed modes (LHMs) of transverse polarization. Th…

[Phys. Rev. B 94, 235114] Published Mon Dec 05, 2016

]]>We derive analytical expressions for the spectral moments of the dynamical response functions of the Hubbard model using the high-temperature series expansion. We consider generic dimension $d$ as well as the infinite-$d$ limit, arbitrary electron density $n$, and both finite and infinite repulsion $U$. We …

[Phys. Rev. B 94, 235115] Published Mon Dec 05, 2016

]]>We investigate the anomalous Hall effect (AHE) on the surface of a topological insulator induced by a finite concentration of magnetic impurities, and find topologically nontrivial and trivial mechanisms simultaneously contributing to the Hall conductivity. In the topologically nontrivial mechanism,…

[Phys. Rev. B 94, 235116] Published Mon Dec 05, 2016

]]>The charge transport properties of individual InSb nanowires based transistors are studied at 4.2 K in the quasiballistic regime. The energy level separations at zero magnetic field are extracted from a bias voltage spectroscopy. The magnetoconductance under a magnetic field applied perpendicularly …

[Phys. Rev. B 94, 235303] Published Mon Dec 05, 2016

]]>In this work the Casimir-Polder interaction energy between a rubidium atom and a disordered graphene sheet is investigated beyond the Dirac cone approximation by means of accurate real-space tight-binding calculations. As a model of defected graphene, we consider a tight-binding model of $\pi $ electrons…

[Phys. Rev. B 94, 235405] Published Mon Dec 05, 2016

]]>A quantum vortex liquid theory for composite Fermi liquid (CFL) states in the lowest Landau level is proposed. Contrary to the traditional Halperin-Lee-Read approach, the composite fermions in this formulation are vortices carrying no physical charge. Furthermore, a Berry phase ${\varphi}_{B}$=-2$\pi \phantom{\rule{0}{0ex}}\nu $ is enclosed by the composite Fermi surface, where $\nu $ is the total filling fraction. This vortex liquid theory is closely related to Read’s formulation of bosonic CFL at $\nu =1$ in the 1990’s, and to Son’s recent formulation of the half-filled Landau level in terms of Dirac composite fermions. Various consequences of this new picture are studied, including some nontrivial predictions for transport properties, and an emergent particle-hole symmetry for bosons at $\nu =1$.

[Phys. Rev. B 94, 245107] Published Mon Dec 05, 2016

]]>We present a systematic investigation of the special twist method introduced by Rajagopal *et al.* [Phys. Rev. B **51**, 10591 (1995)] for reducing finite-size effects in correlated calculations of periodic extended systems with Coulomb interactions and Fermi statistics. We propose a procedure for finding…

[Phys. Rev. B 94, 245108] Published Mon Dec 05, 2016

]]>We investigate the effect of epitaxial strain on the Mott metal-insulator transition (MIT) in perovskite systems with ${d}^{1}$ and ${d}^{2}$ electron configurations of the transition metal (TM) cation. We first discuss the general trends expected from the changes in the crystal-field splitting and in the hopping…

[Phys. Rev. B 94, 245109] Published Mon Dec 05, 2016

]]>We construct a bosonic analog of a two-dimensional topological Dirac semimetal (DSM). The low-energy description of the most basic 2D DSM model consists of two Dirac cones at positions $\pm {\mathbf{k}}_{0}$ in momentum space. The local stability of the Dirac cones is guaranteed by a composite symmetry ${Z}_{2}^{\mathcal{TI}}$, where $\mathcal{T}$ i…

[Phys. Rev. B 94, 245110] Published Mon Dec 05, 2016

]]>Inelastic tunneling of electrons can generate the emission of photons with energies intuitively limited by the applied bias voltage. However, experiments indicate that more complex processes involving the interaction of electrons with plasmon polaritons lead to photon emission with overbias energies…

[Phys. Rev. B 94, 245111] Published Mon Dec 05, 2016

]]>We experimentally study the spin relaxation mechanism in heavily doped $n$-type germanium (Ge) layers by electrically detecting pure spin current transport. The spin diffusion length (${\lambda}_{\mathrm{Ge}}$) in heavily doped $n$-type Ge layers at 125 K is less than $0.7\phantom{\rule{4pt}{0ex}}\mu \mathrm{m}$, much shorter than that expected in the recent stud…

[Phys. Rev. B 94, 245302] Published Mon Dec 05, 2016

]]>Stückelberg interferometry is a phenomenon that has been well established for quantum-mechanical two-level systems. Here, we present classical two-mode interference of a nanomechanical two-mode system, realizing a classical analog of Stückelberg interferometry. Our experiment relies on the coherent …

[Phys. Rev. B 94, 245406] Published Mon Dec 05, 2016

]]>The mechanical properties of monolayer GaS and GaSe crystals are investigated in terms of their elastic constants: in-plane stiffness (C), Poisson ratio $\left(\nu \right)$, and ultimate strength $\left({\sigma}_{U}\right)$ by means of first-principles calculations. The calculated elastic constants are compared with those of graphene and…

[Phys. Rev. B 94, 245407] Published Mon Dec 05, 2016

]]>We consider a triple-quantum-dot (TQD) system composed by an interacting quantum dot connected to two effectively noninteracting dots, which in turn are both connected in parallel to metallic leads. As we show, this system can be mapped onto a single-impurity Anderson model with a nontrivial density…

[Phys. Rev. B 94, 245408] Published Mon Dec 05, 2016

]]>Single crystals of ${\mathrm{PbZrO}}_{3}$ have been studied by dynamic mechanical analysis measurements in the low-frequency range $f=0.02$–50 Hz. The complex Young's modulus exhibits a quite rich behavior and depends strongly on the direction of the applied dynamic force. In pseudocubic ${\left[100\right]}_{c}$ direction, we found in…

[Phys. Rev. B 94, 214101] Published Fri Dec 02, 2016

]]>High resolution inelastic x-ray scattering experiments are widely used to study the electronic and chemical properties of materials under a range of conditions, from ambient temperature to the warm dense matter regime. We use the real-space multiple scattering (RSMS) Green's function formalism coupl…

[Phys. Rev. B 94, 214201] Published Fri Dec 02, 2016

]]>The large epitaxial stress induced by the misfit between a triple atomic layer Fe film and an Ir(111) substrate is relieved by the formation of a dense dislocation line network. Spin-polarized scanning tunneling microscopy investigations show that the strain is locally varying within the Fe film and…

[Phys. Rev. B 94, 214402] Published Fri Dec 02, 2016

]]>Phase decomposition is a well-known process leading to the formation of two-phase mixtures. Here we show that a strain imposed on a ferroelastic crystal promotes the formation of mixed phases and domains, i.e., strain phase separation with local strains determined by a common tangent construction on…

[Phys. Rev. B 94, 220101(R)] Published Fri Dec 02, 2016

]]>