Kitaev quantum spin liquids described by the Kitaev model represent an exotic state of matter with long-range entangled spins and topological order, which hold promise for quantum computation. $\alpha \text{\u2212}{\mathrm{RuCl}}_{3}$, a material with van der Waals layered structure, is shown to be proximate to such a state recently...

[Phys. Rev. B 101, 045419] Published Fri Jan 17, 2020

]]>We have developed a hierarchical nanoparticle transport simulator (hints) and adapted it to study commensuration effects in two classes of nanoparticle (NP) solids: (1) a bilayer NP solid (BNS) with an energy offset and (2) a BNS as part of a field effect transistor (FET). hints integrates the *ab in...*

[Phys. Rev. B 101, 045420] Published Fri Jan 17, 2020

]]>Using the semiclassical quantum Boltzmann theory and employing the Dirac model with twist angle-dependent Fermi velocity, we obtain results for the electrical resistivity, the electronic thermal resistivity, the Seebeck coefficient, and the Wiedemann-Franz ratio in near magic angle twisted bilayer g...

[Phys. Rev. B 101, 045421] Published Fri Jan 17, 2020

]]>The Su–Schrieffer–Heeger (SSH) model is one of the simplest topological lattice models and is a promising candidate for quantum simulations of topological systems. In this study we investigate an interacting SSH model with nearest-neighbor interactions using mean field theory and an exact diagonaliz...

[Phys. Rev. B 101, 045422] Published Fri Jan 17, 2020

]]>The breaking of parity and time-reversal symmetry in two-dimensional Fermi liquids gives rise to nondissipative transport features characterized by the Hall viscosity. In magnetic fields, the Hall viscous force directly competes with the Lorentz force, since both mechanisms contribute to the Hall vo...

[Phys. Rev. B 101, 045423] Published Fri Jan 17, 2020

]]>We study the optical transport properties of the monolayer transition metal dichalcogenides (TMDCs) such as ${\mathrm{MoS}}_{2}$, ${\mathrm{WS}}_{2}$, ${\mathrm{MoSe}}_{2}$, and ${\mathrm{WSe}}_{2}$ in the presence of a magnetic field. The TMDCs band structures are obtained and discussed by using the effective massive Dirac model, in which the spin and valley Ze...

[Phys. Rev. B 101, 045424] Published Fri Jan 17, 2020

]]>We exploit the high-symmetry persistent spin helix state obtained for similar Rashba and linear Dresselhaus interactions in a quantum well to revisit the weak localization problem within a perturbative approach in a Landau level formulation. We define the small parameter of the theory as the deviati...

[Phys. Rev. B 101, 035414] Published Thu Jan 16, 2020

]]>Doping ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ with Ti stabilizes the corundum paramagnetic metallic phase and restricts the transition to the monoclinic antiferromagnetic insulating phase at lower temperatures. In this study, we investigated the dependence of phase stability on Ti concentration for ${\mathrm{V}}_{2}{\mathrm{O}}_{3}$ nanocrystals as small as 20 n...

[Phys. Rev. B 101, 035415] Published Thu Jan 16, 2020

]]>Metallic nanoparticles can localize the incident light to hot spots as plasmon oscillations, where the intensity can be enhanced by up to four orders of magnitude. Even though the lifetime of plasmons is typically short, it can be increased via interactions with quantum emitters, e.g., spaser nanola...

[Phys. Rev. B 101, 035416] Published Thu Jan 16, 2020

]]>We investigated, both experimentally and theoretically, the reflection phase shift (RPS) of one-dimensional plasmon polaritons. We launched one-dimensional (1D) plasmon polaritons in carbon nanotubes and probed the plasmon interference pattern using a scanning near-field optical microscopy technique...

[Phys. Rev. B 101, 041407(R)] Published Thu Jan 16, 2020

]]>Thermal transport by phonons in films with thicknesses of less than 10 nm is investigated in a soft system (Lennard-Jones argon) and a stiff system (Tersoff silicon) using two-dimensional lattice dynamics calculations and the Boltzmann transport equation. This approach uses a unit cell that spans th...

[Phys. Rev. B 101, 045417] Published Thu Jan 16, 2020

]]>Starting from the Bogolubov-de Gennes theory describing the induced p-wave superconductivity in the Majorana wire of an arbitrary shape, we predict a number of intriguing phenomena such as the geometry-dependent phase battery (or a phi-Josephson junction with the spontaneous superconducting phase di...

[Phys. Rev. B 101, 045418] Published Thu Jan 16, 2020

]]>We study the interplay of electron and photon spin in nonreciprocal materials. Traditionally, the primary mechanism to design nonreciprocal photonic devices has been magnetic fields in conjunction with magnetic oxides, such as iron garnets. In this work, we present an alternative paradigm that allow...

[Phys. Rev. B 101, 035412] Published Wed Jan 15, 2020

]]>A strong low-temperature enhancement of the tunneling conductance between graphene bilayers has been reported recently and interpreted as a signature of equilibrium electron-hole pairing, first predicted in bilayers more than 40 years ago but previously unobserved. Here we provide a detailed theory ...

[Phys. Rev. B 101, 035413] Published Wed Jan 15, 2020

]]>We investigate the inverse Faraday effect (IFE) by surface plasmon traveling modes in an ultracompact magnetoplasmonic disk resonator side-coupled to a plasmonic waveguide. The magnetic field by the IFE reacts to the traveling modes and leads to a nonlinear shift of the resonance in the disk resonat...

[Phys. Rev. B 101, 041406(R)] Published Wed Jan 15, 2020

]]>We present a theoretical study of compact magnetic skyrmions in ferromagnetic films with perpendicular magnetic anisotropy that accounts for the full stray field energy in the thin film and low interfacial Dzyaloshinskii-Moriya interaction (DMI) regime. In this regime, the skyrmion profile is close ...

[Phys. Rev. B 101, 045416] Published Tue Jan 14, 2020

]]>We report on a study of the nontrivial Berry phase in superconducting multiterminal quantum dots biased at commensurate voltages. Starting with the time-periodic Bogoliubov–de Gennes equations, we obtain a tight-binding model in Floquet space, and we solve these equations in the semiclassical limit....

[Phys. Rev. B 101, 035411] Published Mon Jan 13, 2020

]]>In this work, we predict a hinged quantum spin Hall (HQSH) effect featured by a pair of counterpropagating chiral hinge modes in antiferromagnetic (AFM) topological insulator (TI) multilayers. This pair of chiral hinge modes are localized on the hinges of the top and bottom surfaces of the AFM TI mu...

[Phys. Rev. B 101, 041404(R)] Published Mon Jan 13, 2020

]]>Here, the authors report on the nonlocal effect of hyperbolic metamaterials as a tool for controlling the migration dynamics of $A$ and $C$ excitons in two-dimensional MoS${}_{2}$. They demonstrate that the Förster-type resonance energy transfer (FRET) process, as a migration mechanism of $A$ excitons, can be controlled by hyperbolic metamaterials in such a way that the Förster radius and FRET efficiency can be enhanced. This study constitutes a significant step forward in enabling nanophotonic hybrid applications based on two-dimensional transition metal dichalcogenides.

[Phys. Rev. B 101, 041405(R)] Published Mon Jan 13, 2020

]]>We revisit charge density wave (CDW) behavior in the archetypal quasi-one-dimensional (quasi-1D) material ${\mathrm{NbSe}}_{3}$ by high-resolution angle-resolved photoemission spectroscopy measurements utilizing a microfocused laser with a photon energy of 6.3 eV. We present a detailed view of the electronic struct...

[Phys. Rev. B 101, 045412] Published Mon Jan 13, 2020

]]>We calculate the Hall conductivity of a Sierpiński carpet using Kubo-Bastin formula. The quantization of Hall conductivity disappears when we increase the depth of the fractal, and the Hall conductivity is no more proportional to the Chern number. Nevertheless, these quantities behave in a similar w...

[Phys. Rev. B 101, 045413] Published Mon Jan 13, 2020

]]>We employ a recent formulation for the optical properties of two-dimensional crystals from first principles [L. Matthes *et al.*, New J. Phys. **16**, 105007 (2014); L. Matthes *et al.*, Phys. Rev. B **94**, 205408 (2016)] to compute the surface susceptibility and surface conductivity of ${\mathrm{MoS}}_{2}$ and ${\mathrm{WSe}}_{2}$ monolay...

[Phys. Rev. B 101, 045414] Published Mon Jan 13, 2020

]]>Periodically driven non-Hermitian systems can exhibit rich topological band structure and non-Hermitian skin effect, without analogs in their static or Hermitian counterparts. In this work we investigate the exceptional band-touching points in the Floquet quasienergy bands, the topological character...

[Phys. Rev. B 101, 045415] Published Mon Jan 13, 2020

]]>We report measurements of the superconducting properties of isolated Nb nanoislands (600–2500 nm diameters) and explain their unusual behavior in terms of rare-region onset effects, predicted for random metal-superconductor granular systems [B. Spivak, P. Oreto, and S. A. Kivelson, Phys. Rev. B **77**, ...

[Phys. Rev. B 101, 035409] Published Fri Jan 10, 2020

]]>Quantum one-dimensional criticality with conformal invariance is known to be characterized by conformal field theory with the inherent central charge ($c$), and universal finite-size amplitudes. Here, the authors demonstrate that around a quantum criticality with $c$=½ and two Majorana boundary modes, the symmetry-breaking effect modifies the finite-size amplitudes from a universal constant to be a universal function of an emergent scale. This finding provides a new perspective to study the interplay of topology and quantum criticality.

[Phys. Rev. B 101, 035410] Published Fri Jan 10, 2020

]]>Atomically thin materials are exceedingly susceptible to their dielectric environment. For transition metal dichalcogenides, sample placement on a substrate or encapsulation in hexagonal boron nitride (hBN) are frequently used. In this paper we show that the dielectric response due to optical phonon...

[Phys. Rev. B 101, 045411] Published Fri Jan 10, 2020

]]>Radiative heat transfer between bodies at the nanoscale can surpass blackbody limits on thermal radiation by orders of magnitude due to contributions from evanescent electromagnetic fields, which carry no energy to the far field. Thus far, principles guiding explorations of larger heat transfer beyo...

[Phys. Rev. B 101, 035408] Published Thu Jan 09, 2020

]]>Among transition-metal dichalcogenides, mono and few-layers thick ${\mathrm{VSe}}_{2}$ has gained much recent attention following claims of intrinsic room-temperature ferromagnetism in this system, which have nonetheless proved controversial. Here, we address the magnetic and chemical properties of $\mathrm{Fe}/{\mathrm{VSe}}_{2}$ heterost...

[Phys. Rev. B 101, 035404] Published Wed Jan 08, 2020

]]>Thermodynamic properties of graphene bilayers are studied by path-integral molecular dynamics (PIMD) simulations, considering quantization of vibrational modes and anharmonic effects. Bilayer graphene has been studied at temperatures between 12 and 1500 K for zero external stress, using the LCBOPII ...

[Phys. Rev. B 101, 035405] Published Wed Jan 08, 2020

]]>In this paper we develop a semi-analytical perturbation-theory approach to the calculation of the energy levels (binding energies) and wave functions of excitons in phosphorene. Our method gives the exciton wave function in both real and reciprocal spaces with the same ease. This latter aspect is im...

[Phys. Rev. B 101, 035406] Published Wed Jan 08, 2020

]]>Recently the charge density wave (CDW) in vanadium dichalcogenides have attracted increasing research interest, but a real-space investigation on the symmetry breaking of the CDW state in ${\mathrm{VTe}}_{2}$ monolayer is still lacking. We have investigated the CDW of ${\mathrm{VTe}}_{2}$ monolayer by low energy electron diffracti...

[Phys. Rev. B 101, 035407] Published Wed Jan 08, 2020

]]>We study two-terminal transport through two-dimensional periodically driven systems in which all bulk Floquet eigenstates are localized by disorder. We focus on the anomalous Floquet-Anderson insulator (AFAI) phase, a topologically nontrivial phase within this class, which hosts topologically protec...

[Phys. Rev. B 101, 041403(R)] Published Wed Jan 08, 2020

]]>We have investigated emission patterns and energy spectra of electrons from a tungsten nanotip induced by circularly polarized femtosecond laser pulses. Variations of emission patterns were observed for different helicities of circular polarization while the energy spectra remained almost identical....

[Phys. Rev. B 101, 045406] Published Wed Jan 08, 2020

]]>Using the tight-binding model and the nonequilibrium Green's function method, we study Andreev reflection in a graphene-superconductor junction, where graphene has two nonequal Dirac cones split in energy and therefore time-reversal symmetry is broken. Due to the antichiral edge states of the curren...

[Phys. Rev. B 101, 045407] Published Wed Jan 08, 2020

]]>In this paper, we develop the excitonic theory of the Kerr rotation angle in a two-dimensional (2D) transition metal dichalcogenide at zero magnetic field. The finite Kerr angle is induced by the interplay between spin-orbit splitting and proximity exchange coupling due to the presence of a ferromag...

[Phys. Rev. B 101, 045408] Published Wed Jan 08, 2020

]]>Magnetic materials in metallic nanostructures allow an external magnetic field to easily control surface plasmon polaritons and surface lattice modes (SLMs), which enhances the value of magneto-optical response. The present paper demonstrates both experimentally and numerically that the inherently d...

[Phys. Rev. B 101, 045409] Published Wed Jan 08, 2020

]]>A molecular heat engine is proposed based on a porphyrin single-molecule junction. The important thermoelectric transport characteristics, such as electrical conductance, thermopower, output power, and efficiency have been calculated by means of a Landauer-Büttiker approach combined with density fun...

[Phys. Rev. B 101, 045410] Published Wed Jan 08, 2020

]]>We present a first-principles-based multiscale simulation framework for quantitative predictions of the high-energy part of the ultraviolet photoelectron spectroscopy (UPS) spectra of amorphous molecular solids. The approach combines a deposition simulation, many-body Green's function theory, polari...

[Phys. Rev. B 101, 035402] Published Tue Jan 07, 2020

]]>We investigate plasmon-emitter interactions in a nanoparticle-on-mirror cavity. We consider two different sorts of emitters: Those that sustain dipolar transitions and those hosting only quadrupolar, dipole-inactive excitons. By means of a fully analytical two-dimensional transformation optics appro...

[Phys. Rev. B 101, 035403] Published Tue Jan 07, 2020

]]>Subband occupancy (i.e., the number of occupied confinement-induced subbands of the semiconductor wire) is a key physical parameter determining the topological properties of superconductor-semiconductor hybrid systems investigated in the context of the search for non-Abelian Majorana zero modes. We ...

[Phys. Rev. B 101, 045405] Published Tue Jan 07, 2020

]]>Recent experiments have proven that few-layer CrI${}_{3}$, a two-dimensional ferromagnetic insulator, orders antiferromagnetically between layers and shows very small critical fields, which allows for full electrical control of interlayer magnetism. Here, the authors propose a switching mechanism based on the formation of magnetic polarons, or ferrons. Electrons in bilayer CrI${}_{3}$ become self-trapped, forming ferromagnetic droplets in an antiferromagnetic insulating matrix. If the concentration of electrons is high enough, the system becomes ferromagnetic. For holes, the self-trapping never occurs.

[Phys. Rev. B 101, 041402(R)] Published Mon Jan 06, 2020

]]>Monolayer graphene contains two inequivalent local minimum valleys, located at $K$ and ${K}^{\prime}$ in the Brillouin zone. There has been considerable interest in the use of these two valleys as a doublet for information processing. Herein we propose a method to resolve valley currents spatially, using only a w...

[Phys. Rev. B 101, 045404] Published Mon Jan 06, 2020

]]>We present an effective low-energy theory of electron-phonon coupling effects for clean cylindrical topological insulator nanowires. Acoustic phonons are modelled by isotropic elastic continuum theory with stress-free boundary conditions. We take into account the deformation potential coupling betwe...

[Phys. Rev. B 101, 045402] Published Fri Jan 03, 2020

]]>Strong light-matter interaction realized by an individual nanoparticle with large coupling energy has attracted much interest due to its great importance in both fundamental quantum science research and potential applications in quantum information devices. We theoretically investigate the strong co...

[Phys. Rev. B 101, 045403] Published Fri Jan 03, 2020

]]>We present here results of an atomistic theory of electrons confined by metallic gates in a single layer of transition metal dichalcogenides. The electronic states are described by the tight-binding model and computed using a computational box with periodic boundary conditions including up to millio...

[Phys. Rev. B 101, 035401] Published Thu Jan 02, 2020

]]>Fundamental properties of the spin-noise signal formation in a quantum-dot microcavity are studied by measuring the angular characteristics of the scattered light intensity. A distributed Bragg reflector microcavity was used to enhance the light-matter interaction with an ensemble of $n$-doped (In,Ga)...

[Phys. Rev. B 101, 041401(R)] Published Thu Jan 02, 2020

]]>Topological insulator nanowires with uniform cross section, combined with a magnetic flux, can host both a perfectly transmitted mode and Majorana zero modes. Here we consider nanowires with rippled surfaces—specifically, wires with a circular cross section with a radius varying along its axis—and w...

[Phys. Rev. B 101, 045401] Published Thu Jan 02, 2020

]]>Majorana billiards are finitely sized, arbitrarily shaped superconducting islands that host Majorana bound states. We study the fermion-parity switches of the ground state of Majorana billiards. In particular, we study the density and statistics of these fermion-parity switches as a function of appl...

[Phys. Rev. B 100, 235455] Published Tue Dec 31, 2019

]]>Polaritons in metals, semimetals, semiconductors, and polar insulators can allow for extreme confinement of electromagnetic energy, providing many promising opportunities for enhancing typically weak light-matter interactions such as multipolar radiation, multiphoton spontaneous emission, Raman scat...

[Phys. Rev. B 100, 235453] Published Mon Dec 30, 2019

]]>We studied the effect of inserting 0.5-nm-thick spacer layers (Ti, V, Cr, Mo, W) at the Pt/Co interface on the spin-orbit torques, the Hall effect, magnetoresistance, saturation magnetization, and magnetic anisotropy. We find that the dampinglike spin-orbit torque decreases substantially for all sam...

[Phys. Rev. B 100, 235454] Published Mon Dec 30, 2019

]]>Molecular dynamics simulations and methods of importance sampling are used to study the heat transport of low-dimensional carbon lattices. For both carbon nanotubes and graphene sheets, heat transport is found to be anomalous, violating Fourier's law of conduction with a system size dependent therma...

[Phys. Rev. B 100, 241409(R)] Published Mon Dec 30, 2019

]]>Beenakker noticed that the peculiar band structure of Dirac fermions in two-dimensional (2D) solids allows for the specular Andreev reflection in these systems, which has no analogue in other 2D electron systems. An interesting deformation of the Dirac equation in the solid state is to tilt it, whic...

[Phys. Rev. B 100, 245436] Published Mon Dec 30, 2019

]]>We investigate the low-energy theory of a one-dimensional finite capacitance topological Josephson junction. Charge fluctuations across the junction couple to resonant microwave fields and can be used to probe microscopic excitations such as Majorana and Andreev bound states. This marriage between l...

[Phys. Rev. B 100, 241408(R)] Published Fri Dec 27, 2019

]]>The generic model of two coupled multimode plasmonic nanospheres with gain and loss forming a parity-time $\left(\mathcal{PT}\right)$ symmetric dimer is considered. Analytical solutions based on a quasistatic approximation are used to explore the behavior of the eigenmodes in such a coupled nanoantenna system as a functio...

[Phys. Rev. B 100, 245434] Published Fri Dec 27, 2019

]]>Using the Bethe ansatz solution, we analytically study expansionary, magnetic, and interacting Grüneisen parameters (GPs) for one-dimensional (1D) Lieb-Liniger and Yang-Gaudin models. These different GPs elegantly quantify the dependence of characteristic energy scales of these quantum gases on the ...

[Phys. Rev. B 100, 245435] Published Fri Dec 27, 2019

]]>We describe a simple and robust method using an internal reflection element to measure the spectra of near-field thermal emission. We experimentally demonstrate the spectrally narrow peaks of near-field thermal emission by isotropic media due to the excitation of surface phonon polaritons in quartz ...

[Phys. Rev. B 100, 235450] Published Thu Dec 26, 2019

]]>Weyl semimetals possess unique electrodynamic properties due to a combination of strongly anisotropic and gyrotropic bulk conductivity, surface conductivity, and surface dipole layer. In particular, the gyrotropy caused by Weyl node separation in momentum space gives rise to the optical Hall effect ...

[Phys. Rev. B 100, 235451] Published Thu Dec 26, 2019

]]>It is of theoretical and experimental interest to engineer topological phases with very large topological invariants via periodic driving. As advocated by this paper, such Floquet engineering can be elegantly achieved by the particle swarm optimization (PSO) technique from the swarm intelligence fam...

[Phys. Rev. B 100, 235452] Published Thu Dec 26, 2019

]]>Compared with the well-established theory for other graphene Raman bands, the origin of the ${\mathrm{G}}^{*}$ band at $\sim 2450\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{-1}$ remains unclear. A major debate lies at whether it should be assigned solely to the combined $q\ne 0$ in-plane (i) transverse-optical (TO) and longitudinal-acoustic (LA) phonon modes, or to su...

[Phys. Rev. B 100, 241407(R)] Published Thu Dec 26, 2019

]]>Carbon monoxide on copper surfaces continues to be a fascinating, rich microlab for many questions evolving in surface science. Recently, hot-electron mediated, femtosecond-laser pulse induced dynamics of CO molecules on Cu(100) were the focus of experiments [Inoue *et al.*, Phys. Rev. Lett. **117**, 186...

[Phys. Rev. B 100, 245431] Published Thu Dec 26, 2019

]]>We present a first-principles study of stoichiometric $\mathrm{LiNb}{\mathrm{O}}_{3}$ (0001) clean positive and negative surface and with ${\mathrm{H}}_{2}\mathrm{O}$, OH and H adsorption. While we exclude internal compensation mechanisms such as enrichment or depletion of certain atomic species, in the frame of surface relaxation with constant sto...

[Phys. Rev. B 100, 245432] Published Thu Dec 26, 2019

]]>We theoretically investigate the effects of Coulomb interaction, at the level of the unscreened Hartree-Fock approximation in an equation of motion framework, on third harmonic generation from undoped graphene. The unperturbed electronic states are described by a widely used two-band tight-binding m...

[Phys. Rev. B 100, 245433] Published Thu Dec 26, 2019

]]>Pd-intercalated ${\mathrm{ErTe}}_{3}$ is studied as a model system to explore the effect of increasing disorder on an incommensurate two-component charge density wave (CDW). The ordering vectors of the CDW components lie along the two in-plane principal axes of the nearly tetragonal crystal structure. Using scannin...

[Phys. Rev. B 100, 235446] Published Tue Dec 24, 2019

]]>Scanning tunneling microscopy measurements on Ag(111)/$\mathrm{Mo}{\mathrm{S}}_{2}$ reveal atomically flat preferred, or “magic,” heights occurring at 6, 10, and 14 atomic layers. These results are consistent with Ag growth on a variety of semiconducting substrates and correlate with electronic energy savings in electronic ...

[Phys. Rev. B 100, 235447] Published Tue Dec 24, 2019

]]>We simulate the near-field effects of strong coupling between molecular excitons and localized surface plasmons, supported by aluminum nanodisks. The simulations are done using a simple model of a two-level system, implemented in a commercial electromagnetic finite-difference time-domain solver. Whi...

[Phys. Rev. B 100, 235448] Published Tue Dec 24, 2019

]]>The formation of novel two-dimensional electron gas (2DEG) with high mobility in metal/amorphous interfaces has motivated an ongoing debate regarding the formation and novel characteristics of these 2DEGs. Here we report an optical study, based on infrared spectroscopic ellipsometry, of nonmagnetic ...

[Phys. Rev. B 100, 235449] Published Tue Dec 24, 2019

]]>The third-rank tensor of the static spin Hall conductivity is investigated for two-dimensional (2D) topological insulators by electronic structure calculations. For highly symmetric hexagonal systems its numerical values are close to the conductance quantum ${e}^{2}/h$, independent of the gap size. 2D crys...

[Phys. Rev. B 100, 245430] Published Tue Dec 24, 2019

]]>Numerically investigating mode-conversion effects of phonons on Anderson localization in random superlattices, we make it clear the changes in localization properties when the LA and TA phonons which independently show Anderson localization for the normal incidence interact as the incident angles in...

[Phys. Rev. B 100, 235441] Published Mon Dec 23, 2019

]]>We propose a quantum heat engine based on an Aharonov-Bohm interferometer in a two-terminal geometry and investigate its thermoelectric performances in the linear response regime. Sizeable thermopower (up to $\sim 0.3\phantom{\rule{0.16em}{0ex}}\text{mV}$/K) as well as $ZT$ values largely exceeding unity can be achieved by simply adjusting p...

[Phys. Rev. B 100, 235442] Published Mon Dec 23, 2019

]]>Superscattering is usually described as a scattering cross section, induced by degenerate resonances, that exceeds the single-channel limit of a subwavelength scatterer. It has important applications in sensing, bioimaging, and emissions amplification. The quality factor $(Q$ factor) of superscatterin...

[Phys. Rev. B 100, 235443] Published Mon Dec 23, 2019

]]>We theoretically study the spontaneous formation of the quantum anomalous Hall effect in a graphene system of spin-bifurcated exciton-polariton condensates under nonresonant pumping. We demonstrate that, depending on the parameters of the structure, such as intensity of the pump and coupling strengt...

[Phys. Rev. B 100, 235444] Published Mon Dec 23, 2019

]]>The discovery of two-dimensional (2D) ferroic materials has stimulated substantial efforts in developing emergent functionalities by synthesizing van der Waals (vdW) heterostructures, and one promising effect is the nonvolatile electrical control of magnetism in magnetoelectric (ME) heterostructures...

[Phys. Rev. B 100, 235445] Published Mon Dec 23, 2019

]]>This work presents measurements of laser-induced solid-solid phase transitions in Co nanoparticles, using time-resolved wide-angle x-ray scattering with <100-ps time resolution. A comparison of the experimental results with scattering simulations indicates a phase transition from the as-synthesized $\epsilon $ phase into a mixed phase of 2/3 *hcp* and 1/3 *fcc* character during the first 100 ps. The measured scattering signal observed at the shortest invest...

[Phys. Rev. B 100, 245425] Published Mon Dec 23, 2019

]]>We construct a model describing the response of a hybrid system where the electromagnetic field—in particular, surface plasmon polaritons—couples strongly with electronic excitations of atoms or molecules. Our approach is based on the input-output theory of quantum optics, and in particular it takes...

[Phys. Rev. B 100, 245426] Published Mon Dec 23, 2019

]]>Strong coupling of semiconductor spin qubits to superconducting microwave resonators was recently demonstrated [X. Mi *et al.*, Nature **555**, 599 (2018); A. J. Landig *et al.*, Nature **560**, 179 (2018); N. Samkharadze *et al.*, Science **359**, 1123 (2018); T. Cubaynes *et al.*, NPJ Quant. Inf. **5**, 47 (2019)]. T...

[Phys. Rev. B 100, 245427] Published Mon Dec 23, 2019

]]>We examine the directional characteristics of emission from a dipole on hyperbolic metamaterial (HMM) and we show the possibility of chiral emission which is strongly dependent on the polarization of the dipole. Using rigorous solutions of the Maxwell equations, we present analytical results on chir...

[Phys. Rev. B 100, 245428] Published Mon Dec 23, 2019

]]>An effective Hamiltonian is derived to describe the conduction band of monolayer black phosphorus (phosphorene) in the presence of spin-orbit coupling and external electric field. The envelope function approximation along with symmetry arguments and Lowdin partitioning are utilized to derive extrins...

[Phys. Rev. B 100, 245429] Published Mon Dec 23, 2019

]]>Recently, considerable attention has been paid to tune the emission using hybrid systems composed of layered transition-metal dichalcogenides and metal nanoparticles (NPs) since metal NPs have the ability to enhance and localize the incident electromagnetic field. Furthermore, these hybrid systems s...

[Phys. Rev. B 100, 235438] Published Fri Dec 20, 2019

]]>We assess several recently developed dispersion-corrected exchange-correlation functionals $[\mathrm{PBE}+\mathrm{VV}10\mathrm{L}$ of H. Peng and J. P. Perdew, Phys. Rev. B **95**, 081105 (2017); $\mathrm{SG}4+\mathrm{VV}10\mathrm{m}$ of A. V. Terentjev *et al.*, Computation **6**, 7 (2018); and $\text{PBEsol}+\text{VV}10\text{s}$ of A. V. Terentjev *et al.*, Phys. Rev. B **98**, 214108 (2018...

[Phys. Rev. B 100, 235439] Published Fri Dec 20, 2019

]]>We use density functional theory to explore the possibility of making the semiconducting transition-metal dichalcogenide ${\mathrm{MoS}}_{2}$ ferromagnetic by introducing holes into the narrow Mo $d$ band that forms the top of the valence band. In the single impurity limit, the repulsive Coulomb potential of an accep...

[Phys. Rev. B 100, 235440] Published Fri Dec 20, 2019

]]>We study a Rashba quantum ring subjected to an in-plane static electric field. Due to the violation of the rotational symmetry, the system radiates at the Rabi frequency upon interaction with a strong electromagnetic field. With a proper choice of the driving amplitude, the radiation frequency is in...

[Phys. Rev. B 100, 235434] Published Thu Dec 19, 2019

]]>Two-dimensional (2D) materials have recently attracted significant interest in condensed-matter physics and materials science due to rich intriguing physics and potential applications. Here, by first-principles calculations, we discover a phase of transition-metal dichalcogenides $(\mathrm{Mo}{\mathrm{S}}_{2}$ and its famil...

[Phys. Rev. B 100, 235435] Published Thu Dec 19, 2019

]]>We propose a global optimization strategy for atomistic structure determination based on two new concepts: a few-atom complementary energy landscape and atomic role models. Global optimization of costly energy expressions may be aided by performing some of the optimization on model energy landscapes...

[Phys. Rev. B 100, 235436] Published Thu Dec 19, 2019

]]>We study the magnetoresistance of an ultrahigh mobility GaAs/AlGaAs two-dimensional electron system (2DES) in a weak magnetic field under low-frequency $(f<20$ GHz) microwave (MW) irradiation. We observe that, with decreasing MW frequency, microwave induced resistance oscillations (MIRO) are damped...

[Phys. Rev. B 100, 235437] Published Thu Dec 19, 2019

]]>We propose the metasurface-based cavities for splitting a linearly polarized (LP) electromagnetic wave into two symmetric circularly polarized (CP) beams with opposite helicities. More specifically, periodic strip slits and rectangular C-slits etched on substrate integrated waveguide cavities are sh...

[Phys. Rev. B 100, 245421] Published Thu Dec 19, 2019

]]>Comprehensive knowledge of Casimir forces and associated electrostatics from conductive SiC and Ru surfaces can be essential in diverse areas ranging from micro/nanodevice operation in harsh environments to multilayer coatings in advanced lithography technologies. Hence, the Casimir force was measur...

[Phys. Rev. B 100, 245422] Published Thu Dec 19, 2019

]]>The interaction with time-dependent external fields, especially the interplay between time-dependent driving and quantum correlations, changes the familiar picture of electron transport through nanoscale systems. Although the exact solution of the problem of AC quantum transport of noninteracting el...

[Phys. Rev. B 100, 245423] Published Thu Dec 19, 2019

]]>Spin injection is a powerful experimental probe into a wealth of nonequilibrium spin-dependent phenomena displayed by materials with sizable spin-orbit interactions. Here, we present a theory of coupled spin-charge diffusive transport in spin-valve devices built from two-dimensional materials. The f...

[Phys. Rev. B 100, 245424] Published Thu Dec 19, 2019

]]>Quadratic detection in linear mesoscopic transport systems produces cross terms that can be viewed as interference signals reflecting statistical properties of charge carriers. In electronic systems these cross-term interferences arise from exchange effects due to Pauli principle. Here we demonstrat...

[Phys. Rev. B 100, 235433] Published Wed Dec 18, 2019

]]>Landau levels of AB-stacked four- to six-layer graphene were studied experimentally in the presence of a perpendicular electric field. The Landau levels at a low magnetic field showed a characteristic structure that originated from the mini-Dirac cones created by the perpendicular electric fields. S...

[Phys. Rev. B 100, 245420] Published Wed Dec 18, 2019

]]>Many molecular junctions display stochastic telegraphic switching between two distinct current values, which is an important source of fluctuations in nanoscale quantum transport. Using Markovian master equations, we investigate electronic fluctuations and identify regions of nonrenewal behavior ari...

[Phys. Rev. B 100, 235430] Published Tue Dec 17, 2019

]]>We consider an impurity in a semi-infinite one-dimensional system of weakly-interacting bosons. We calculate the interaction potential for the impurity due to the end of the system, i.e., the wall. For local repulsive (attractive) interaction between the impurity and the Bose gas, the interaction po...

[Phys. Rev. B 100, 235431] Published Tue Dec 17, 2019

]]>The generation of spin current is of significant importance for advanced spintronic applications. In conventional theory and experiment, microwave sources are usually described by a classical time-varying field in which all fluctuations are neglected. Here, we study the spin current driven by noncla...

[Phys. Rev. B 100, 235432] Published Tue Dec 17, 2019

]]>We investigate numerically the problem of few (one or two) noninteracting spin-$1/2$ fermions in a shallow harmonic trap coupled via contact repulsive interactions to a uniform one-dimensional bath of lattice bosons, described by the Bose-Hubbard model. Through extensive density-matrix renormalization...

[Phys. Rev. B 100, 245419] Published Tue Dec 17, 2019

]]>Nanoscale solid-solid contacts are key elements which determine the electrical and thermal behavior of modern electronic devices and micro- and nanoelectromechanical systems. Here we show that simultaneous measurements of the shear force and the heat flow in nanoscale junctions reveal a linear corre...

[Phys. Rev. B 100, 235426] Published Mon Dec 16, 2019

]]>At the heart of the study of topological insulators lies a fundamental dichotomy: Topological invariants are defined in infinite systems but surface states as their main footprint only exist in finite systems. In the slab geometry, namely, infinite in two planar directions and finite in the perpendi...

[Phys. Rev. B 100, 235427] Published Mon Dec 16, 2019

]]>Pumping occurs when matter is transported via periodic modulation of some system parameters. The authors propose a method to achieve perfectly quantized charge pumping at any finite speed exploiting topological properties and quantum control techniques, known as shortcuts to adiabaticity. Using realistic system parameters, they show that the scheme can improve the pumping accuracy of realistic devices by various orders of magnitude.

[Phys. Rev. B 100, 235428] Published Mon Dec 16, 2019

]]>The recent development of efficient chirality sorting techniques has opened the way to the use of single-walled carbon nanotubes (SWCNTs) in a plethora of nanoelectronic, photovoltaic, and optoelectronic applications. However, to understand the excitation processes undergone by SWCNTs, it is necessa...

[Phys. Rev. B 100, 235429] Published Mon Dec 16, 2019

]]>In a recent experiment [A. Donarini *et al.*, Nat. Commun. **10**, 381 (2019)], electronic transport through a carbon nanotube quantum dot was observed to be suppressed by the formation of a quantum-coherent “dark state.” In this paper we consider theoretically the counting statistics and waiting-time di...

[Phys. Rev. B 100, 245414] Published Mon Dec 16, 2019

]]>The model of thermal rectifier based on the asymmetry of interaction of the molecular chain ends with thermostats is proposed in this work. The rectification mechanism is not related to the chain asymmetry but to the asymmetry of the interaction of chain ends with thermostats, for instance, due to d...

[Phys. Rev. B 100, 245415] Published Mon Dec 16, 2019

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