We study the nonlinear thermoelectric cooling performance of a quantum spin Hall system. The setup consists of a nanomagnet contacting a Kramers pair of helical edge states, resulting in a transmission probability with a rich structure containing peaks, well-type, and step-type features. We present ...

[Phys. Rev. B 102, 155434] Published Fri Oct 30, 2020

]]>As an allotrope of black phosphorus, two-dimensional blue phosphorus (2D bP) has gained significant attention since the first realization of its growth through molecular beam epitaxy in 2016. In this paper, self-encapsulated blue phosphorus nanoscrolls (bPNSs) formed by rolling up 2D bP are found to...

[Phys. Rev. B 102, 165428] Published Fri Oct 30, 2020

]]>Due to the absence of matching carbon atoms at honeycomb centers with carbon atoms in adjacent graphene sheets, theorists predicted that a sliding process is needed to form *AA*, $A{B}^{\prime}$, or *ABC* stacking when directly converting graphite into $s{p}^{3}$ bonded diamond. Here, using twisted bilayer graphene, which...

[Phys. Rev. B 102, 155431] Published Thu Oct 29, 2020

]]>Enhancing the light-matter interaction in two-dimensional (2D) materials with high $Q$ resonances in photonic structures has boosted the development of optical and photonic devices. Herein we intend to build a bridge between the radiation engineering and the bound states in the continuum (BIC), and pr...

[Phys. Rev. B 102, 155432] Published Thu Oct 29, 2020

]]>A proper control of nanoscale friction is mandatory for the fabrication and operation of optimal nanoengineered devices. In this respect, the use of electric fields looks to be promising, since they are able to alter the frictional response without imprinting permanent deformations into the structur...

[Phys. Rev. B 102, 155433] Published Thu Oct 29, 2020

]]>We report the experimental study of the temperature dependence of the longitudinal spin relaxation time ${T}_{1}$ of single nitrogen-vacancy (NV) centers hosted in nanodiamonds. To determine the relaxation mechanisms at stake, measurements of the ${T}_{1}$ relaxation time are performed for a set of individual NV ...

[Phys. Rev. B 102, 165427] Published Thu Oct 29, 2020

]]>We study the single- and many-particle properties of a two-leg ladder model threaded by a flux with the legs coupled by a spatially varying term. Although *a priori* unrelated to twisted bilayer graphene (TBG), the model is found to have striking similarities: a quasi-flat low-energy band emerges with...

[Phys. Rev. B 102, 155429] Published Wed Oct 28, 2020

]]>Smoothly confined graphene quantum dots (GQDs) localize Dirac electrons with conserved spin and valley degrees of freedom. Recent experimental realization of such structures using a combination of magnetic fields and a scanning tunneling microscope tip showcased their potential in locally probing an...

[Phys. Rev. B 102, 155430] Published Wed Oct 28, 2020

]]>$A{B}_{2}{\mathrm{O}}_{4}$ normal spinels with a magnetic $B$ site can host a variety of magnetic and orbital frustrations leading to spin-liquid phases and field-induced phase transitions. Here, we report the epitaxial growth of (111)-oriented $\mathrm{Mg}{\mathrm{Cr}}_{2}{\mathrm{O}}_{4}$ thin films. By characterizing the structural and electronic properties...

[Phys. Rev. B 102, 165426] Published Wed Oct 28, 2020

]]>We show that chiral co-propagating Luttinger liquid edge modes can be created and tuned by shining high-frequency, (time-reversal breaking) circularly polarized light, normal to the layers. The one-dimensional chiral modes can be localized either at the edge of the system or at a domain-wall created...

[Phys. Rev. B 102, 155428] Published Tue Oct 27, 2020

]]>The dynamics of exciton recombination and spin relaxation in thin (Ga,Al)(Sb,As)/AlAs quantum wells (QWs) with indirect band gap are studied. The band alignment in these QWs is identified as type I. The exciton recombination time exceeds hundreds of microseconds, while the spin relaxation times of t...

[Phys. Rev. B 102, 165423] Published Tue Oct 27, 2020

]]>We study the dynamical stability of two-dimensional (2D) metals from Li to Pb in the periodic table. Using a first-principles approach, we calculate the phonon band structure of 2D metals that have planar hexagonal (HX), buckled honeycomb (bHC), and buckled square (bSQ) lattice structures. The bHC a...

[Phys. Rev. B 102, 165424] Published Tue Oct 27, 2020

]]>Inside a three-dimensional strong topological insulator, a tube with $h/2e$ magnetic flux carries a pair of protected one-dimensional linear fermionic modes. This phenomenon is known as the “wormhole effect.” In this work, we find that the wormhole effect, as a unique degree of freedom, introduces exo...

[Phys. Rev. B 102, 165425] Published Tue Oct 27, 2020

]]>We propose a linear actuation mechanism for twisted bilayer graphene. Using molecular dynamics simulations, we show that the translational motion of a layer can cause another layer to move in an orthogonal direction. Such an effect depends strongly on the crystallographic orientation of graphene wit...

[Phys. Rev. B 102, 155424] Published Mon Oct 26, 2020

]]>Chern-Simons theories, initially developed for high-energy physics, have been very successful in explaining integer and fractional quantum Hall phases of matter, topological insulators, and Weyl semimetals. However, it was an open question as to whether Chern-Simons theories can be adapted to topological photonics. Here, the authors develop a viscous Maxwell-Chern-Simons theory to capture the fundamental physics of a topological electromagnetic phase of matter. The theory applies to viscous Hall fluids and predicts the existence of unique spin-1 photonic skyrmions in momentum space.

[Phys. Rev. B 102, 155425] Published Mon Oct 26, 2020

]]>Hall resistance ${R}_{xy}$ is commonly suggested to be linear-in-magnetic-field $B$, provided the field is small. We argue here that at low temperatures this linearity is broken due to weak localization/antilocalization phenomena in inhomogeneous systems, while in a uniform medium the linear-in-field depende...

[Phys. Rev. B 102, 155426] Published Mon Oct 26, 2020

]]>We reveal how to exploit joint spatial-electromagnetic duality symmetries to obtain invariant scattering properties (including extinction, scattering, absorption) of self-dual scattering systems for incident waves of arbitrary polarizations. The electromagnetic duality ensures the helicity preservat...

[Phys. Rev. B 102, 155427] Published Mon Oct 26, 2020

]]>Optimally chiral electromagnetic fields with maximized helicity density, recently introduced by Hanifeh *et al.* [M. Hanifeh, M. Albooyeh, and F. Capolino, ACS Photonics **7**, 2682 (2020)], enable chirality characterization of optically small nanoparticles. Here we demonstrate a technique to obtain optim...

[Phys. Rev. B 102, 165419] Published Mon Oct 26, 2020

]]>Two-dimensional materials exhibit a variety of mechanical instabilities accompanied by spontaneous symmetry breaking. Here, we develop a continuum description of the buckling instability of antimonene sheets. Regions of oppositely directed buckling constitute domains separated by domain walls that a...

[Phys. Rev. B 102, 165420] Published Mon Oct 26, 2020

]]>We study thermal fluctuations of freestanding bilayer graphene subject to vanishing external tension. Within a phenomenological theory, the system is described as a stack of two continuum crystalline membranes, characterized by finite elastic moduli and a nonzero bending rigidity. A nonlinear rotati...

[Phys. Rev. B 102, 165421] Published Mon Oct 26, 2020

]]>Intricate topographical patterns can form on the surface of crystalline Ge(001) subject to low-energy ion irradiation in the reverse epitaxy regime, i.e., at elevated temperatures which enable dynamic recrystallization. We compare such nanoscale patterns produced by irradiation from varied polar and...

[Phys. Rev. B 102, 165422] Published Mon Oct 26, 2020

]]>Electron-phonon coupling in monolayer graphene breaks the adiabatic Born-Oppenheimer approximation and could lead to exotic logarithmic Kohn anomaly, manifested as logarithmic singularity in optical-phonon energy. However, unraveling unambiguously the fascinating logarithmic Kohn anomaly in monolaye...

[Phys. Rev. B 102, 165415] Published Fri Oct 23, 2020

]]>We study the magnetic-field dependence of Landau levels in graphene proximitized by large spin-orbit coupling materials, such as transition-metal dichalcogenides or topological insulators. In addition to the Rashba coupling, two types of intrinsic spin-orbit interactions, uniform (Kane-Mele type) an...

[Phys. Rev. B 102, 165416] Published Fri Oct 23, 2020

]]>This work demonstrates that Kirchhoff's law of radiation, stating that the spectral directional emissivity and absorptivity of a surface are equal at thermal equilibrium, can be violated in planar surfaces without an external magnetic field or structures such as gratings. Modeling a type-I magnetic ...

[Phys. Rev. B 102, 165417] Published Fri Oct 23, 2020

]]>We study a model of an isothermal steady-state work-to-work converter, where a single quantum two-level system (TLS) driven by time-dependent periodic external fields acts as the working medium and is permanently put in contact with a thermal reservoir at fixed temperature $T$. By combining short-iter...

[Phys. Rev. B 102, 165418] Published Fri Oct 23, 2020

]]>We unveil a previously overlooked wave propagation regime in magnetized plasmonic (gyrotropic) materials with comparable plasma and cyclotron frequencies, which enables a giant and broadband (nondispersive) nonreciprocal response. We show that this effect is due to a natural form of dispersion compe...

[Phys. Rev. B 102, 155420] Published Thu Oct 22, 2020

]]>We show analytically that the ability of Dirac materials to localize an electron in both a barrier and a well can be utilized to open a pseudogap in graphene's spectrum. By using narrow top gates as guiding potentials, we demonstrate that graphene bipolar waveguides can create a nonmonotonous one-di...

[Phys. Rev. B 102, 155421] Published Thu Oct 22, 2020

]]>The surface atomic and electronic structure after deposition of one-third of a monolayer Te on Cu(111) was determined using a combination of low-energy electron diffraction (LEED), scanning tunneling microscopy and spectroscopy (STM/STS), angle-resolved single and two-photon photoelectron spectrosco...

[Phys. Rev. B 102, 155422] Published Thu Oct 22, 2020

]]>We investigate a heat engine with a finite-length Kitaev chain in an ideal Otto cycle. It is found that the critical point of the topological phase transition coincides with the maxima of the efficiency and work output of the total Otto engine. Finite-size effects are taken into account using the me...

[Phys. Rev. B 102, 155423] Published Thu Oct 22, 2020

]]>We predict electric-field-driven exciton vortices in transition metal dichalcogenide monolayers in the Bose-Einstein condensation regime. The Rashba spin-orbit coupling created by perpendicular electric fields couples the bright and dark excitons, behaves like an emerging SU(2) gauge field for excit...

[Phys. Rev. B 102, 165413] Published Thu Oct 22, 2020

]]>We theoretically investigate photoinduced phenomena induced by time-periodic driving fields in two-dimensional electron gases under perpendicular magnetic fields with Rashba spin-orbit coupling. Using perturbation theory, we provide analytical results for the Floquet-Landau energy spectrum appearing...

[Phys. Rev. B 102, 165414] Published Thu Oct 22, 2020

]]>Single-layer $h-\mathrm{BN}$ is known to have edges with unique magnetism; however, in the commonly fabricated multilayer ${\text{AA}}^{\prime}-h-\mathrm{BN}$, edge relaxations occur that create interlayer bonds and eliminate the unpaired electrons at the edge. Recently, a robust method of growing the unconventional Bernal-stacked $h-\mathrm{BN}$ ($\mathrm{...}$

[Phys. Rev. B 102, 155419] Published Tue Oct 20, 2020

]]>The electronic structures of $\mathrm{La}\mathrm{Ni}{\mathrm{O}}_{3}$ thin films with an oxygen vacancy on a $\mathrm{Sr}\mathrm{Ti}{\mathrm{O}}_{3}$ substrate are investigated using first-principles calculations. We find that the oxygen vacancy induces the insulator-metal transition as the film thickness is increased. For a 1.0-unit-cell-thick $\mathrm{La}\mathrm{Ni}{\mathrm{O}}_{3}$ film, an insul...

[Phys. Rev. B 102, 165411] Published Tue Oct 20, 2020

]]>Two-dimensional $\mathrm{Mo}{\mathrm{S}}_{2}$ forms stable and several metastable allotropes of semimetallic, metallic, and semiconducting characters, depending on the experimental growth conditions. In this paper we consider intergrowth of the two most frequently reported metastable phases of $\mathrm{Mo}{\mathrm{S}}_{2}$ ($1T$ and $1{T}^{\prime}$) within the s...

[Phys. Rev. B 102, 165412] Published Tue Oct 20, 2020

]]>We investigated third-order correlations between photons from a single quantum dot's resonance fluorescence in the strong excitation regime originating from opposite sidebands of the power spectrum. The three-time correlation measurements for photons filtered using three independent Fabry-Perot etal...

[Phys. Rev. B 102, 155418] Published Mon Oct 19, 2020

]]>We find that thin peptide films and coatings doped with metallic nanoparticles are more stable due to the role of electromagnetic fluctuations. It is shown that for the doped freestanding in vacuum peptide film the Casimir attraction becomes larger in magnitude. For dielectric substrates coated with...

[Phys. Rev. B 102, 161405(R)] Published Mon Oct 19, 2020

]]>We report a combined inelastic neutron- and x-ray-scattering study of the phonon density of states of the nano- and microcrystalline lanthanide-based materials ${\mathrm{NaY}}_{0.8}{\mathrm{Yb}}_{0.18}{\mathrm{Er}}_{0.02}{\mathrm{F}}_{4}$ and $\mathrm{Na}{\mathrm{Gd}}_{0.8}{\mathrm{Yb}}_{0.18}{\mathrm{Er}}_{0.02}{\mathrm{F}}_{4}$. While large (20 nm) nanocrystals display the same vibrational spectra as their microcrystall...

[Phys. Rev. B 102, 165409] Published Mon Oct 19, 2020

]]>The charge-density wave (CDW) transition has been extensively studied in transition metal dichalcogenides (TMDs), the underlying mechanism and the related metal-insulator transition are not as simple as Peierls instability in one dimension and still under hot debate. Here, through electrochemical in...

[Phys. Rev. B 102, 165410] Published Mon Oct 19, 2020

]]>Unidirectional in-plane structural anisotropy in rhenium-based dichalcogenides introduces a new class of 2D materials, exhibiting anisotropic optical properties. In this work, we perform temperature-dependent, polarization-resolved photoluminescence and reflectance measurements on several-layer ${\mathrm{ReS}}_{2}$...

[Phys. Rev. B 102, 161404(R)] Published Fri Oct 16, 2020

]]>A quantum pump in a buckled graphene ribbon with armchair edges is discussed numerically. By solving the Su-Schrieffer-Heeger model and performing the computer simulation of quantum transport we find that a kink adiabatically moving along the metallic ribbon results in highly efficient pumping, with...

[Phys. Rev. B 102, 165408] Published Fri Oct 16, 2020

]]>Light-engineering of quantum materials via electromagnetic dressing is considered an on-demand approach for tailoring electronic band dispersions and even inducing topological phase transitions. For probing such dressed bands, photoemission spectroscopy is an ideal tool, and we employ here a novel e...

[Phys. Rev. B 102, 161403(R)] Published Thu Oct 15, 2020

]]>Resonance effects play an important role in the transport properties of low-dimensional systems. Here, we investigate the thermally driven spin-transport properties of ruthenium-terpyridine molecular devices, where the molecule is linked to graphene electrodes by the carbon atomic chains from two si...

[Phys. Rev. B 102, 155415] Published Wed Oct 14, 2020

]]>The simplest continuum model of a one-dimensional noninteracting superconducting fermionic symmetry-protected topological (SPT) phase is studied in great detail using analytical methods. In a first step, we present a full exact diagonalization of the fermionic Bogoliubov–de Gennes Hamiltonian for a ...

[Phys. Rev. B 102, 155416] Published Wed Oct 14, 2020

]]>Boundaries constitute a rich playground for quantum many-body systems because they can lead to novel degrees of freedom such as protected boundary states in topological phases. Here, we study the ground state of integer quantum Hall systems in the presence of boundaries through the reduced density m...

[Phys. Rev. B 102, 155417] Published Wed Oct 14, 2020

]]>We theoretically study Josephson junctions with a transition metal dichalcogenide zigzag ribbon as a weak link. We demonstrate that the spatial profile of the supercurrent carried by the edge modes determines the critical current dependence on the perpendicular magnetic field. We explore this findin...

[Phys. Rev. B 102, 165407] Published Wed Oct 14, 2020

]]>We investigate the spin valley polarization in $\mathrm{Mo}{\mathrm{Te}}_{2}$ monolayer on (111) and (001) surfaces of ferromagnetic semiconductor EuO based on first-principles calculations. We consider surface reconstructions for EuO(111). We find that there is no direct chemical bonding between the reconstructed EuO(111) ...

[Phys. Rev. B 102, 155413] Published Tue Oct 13, 2020

]]>Unique electronic band structure of graphene with its semimetallic features near the charge neutrality point is sensitive to impurity effects. Using the Lifshitz and Anderson impurity models, we study in detail the disorder induced spectral phenomena in the electronic band structure of graphene, nam...

[Phys. Rev. B 102, 155414] Published Tue Oct 13, 2020

]]>We investigate self-organized synchronization in a blue-detuned optomechanical cavity that is mechanically coupled to an undriven mechanical resonator. By controlling the strength of the driving field, we engineer a mechanical gain that balances the losses of the undriven resonator. This gain-loss b...

[Phys. Rev. B 102, 155410] Published Mon Oct 12, 2020

]]>We calculate the electrical and thermal conductivity of a two-dimensional electron gas with strong spin-orbit coupling in which the scattering is dominated by electron-electron collisions. Despite the apparent absence of Galilean invariance in the system, the two-particle scattering does not affect ...

[Phys. Rev. B 102, 155411] Published Mon Oct 12, 2020

]]>Single-layer antimony or antimonene is a recently discovered two-dimensional material with high environmental stability and appealing electronic properties. Antimonene is characterized by strong spin-orbit coupling, which suggests unconventional behavior in magnetic fields. In this paper, we report ...

[Phys. Rev. B 102, 155412] Published Mon Oct 12, 2020

]]>Single layers of hexagonal two-dimensional nanostructures such as graphene, silicene, and germanene exhibit large carrier Fermi velocities and, consequently, large light-matter coupling strength making these materials promising elements for nano-optoelectronics. Although these materials are centrosy...

[Phys. Rev. B 102, 165406] Published Mon Oct 12, 2020

]]>We examine the occurrence of Bose-Einstein condensation and superfluidity of dipolar excitons for a pair of quasi-two-dimensional spatially separated hexagonal $\alpha \text{\u2212}{\mathcal{T}}_{3}$ layers. In the $\alpha \text{\u2212}{\mathcal{T}}_{3}$ model, the $AB$-honeycomb lattice structure is supplemented with C atoms, located at the centers of the hexagonal lat...

[Phys. Rev. B 102, 155408] Published Fri Oct 09, 2020

]]>Effects of electron-electron interactions on the optical response of graphene nanoribbons are theoretically investigated in an effective-mass approximation in a comprehensive manner. In optical absorption spectra of armchair and zigzag nanoribbons without and with doping, excitons, which are bound s...

[Phys. Rev. B 102, 155409] Published Fri Oct 09, 2020

]]>Vibration modes of hydrogen atoms on Ni(100) are studied. The number of observed energy losses as well as their full width at half maximum (FWHM) are incompatible with the classical model of localized vibrations. Number and energy of modes agree, however, well with a previously published quantum-mec...

[Phys. Rev. B 102, 165405] Published Fri Oct 09, 2020

]]>A quantum thermal machine can be controlled by time-periodic perturbations that define a cycle, as in conventional macroscopic thermal machines. This paper presents a general and unified approach to the study of quantum thermal machines, including both heat engines and refrigerators, which operate under periodic adiabatic driving and are in contact with thermal reservoirs kept at different temperatures. Importantly, many observables characterizing the operation and the performance of these machines are geometric in nature.

[Phys. Rev. B 102, 155407] Published Thu Oct 08, 2020

]]>Topological superconductors, characterized by topologically nontrivial states residing in a superconducting gap, are a recently discovered class of materials having Majorana fermions. The interplay of superconductivity and topological states gives rise to opportunities for achieving such topological...

[Phys. Rev. B 102, 155406] Published Wed Oct 07, 2020

]]>We report a combined scanning tunneling microscopy and x-ray magnetic circular dichroism study to investigate the structural properties and magnetic behavior of a Co ultrathin film composed of dimer nanolines. These Co nanolines, ∼6 nm in length, are grown on a Si nanotemplate composed of nanoribbon...

[Phys. Rev. B 102, 155403] Published Tue Oct 06, 2020

]]>We introduce an adiabatic transfer protocol for spin states in large quantum dot arrays that is based on time-dependent modulation of the Heisenberg exchange interaction in the presence of a magnetic field gradient. We refer to this protocol as spin-CTAP (coherent transport by adiabatic passage) in ...

[Phys. Rev. B 102, 155404] Published Tue Oct 06, 2020

]]>This theoretical work studies a nanoscale machine that converts a nonequilibrium distribution (e.g., a mixture of hot and cold electrons) into useful work, with an efficiency that “appears” to exceed the Carnot efficiency. This is called an $N$-demon (”$N$” for nonequilibrium) in analogy with a Maxwell demon. The authors show here that the laws of thermodynamics are not violated because the machine consumes the free energy of the nonequilibrium distribution. Why not use such machines to exploit the nonequilibrium distributions that are the “waste” output of other nanoscale device operations?

[Phys. Rev. B 102, 155405] Published Tue Oct 06, 2020

]]>In this paper, we predict two-dimensional transition metal boride $\mathrm{Ti}{\mathrm{B}}_{2}{\mathrm{C}}_{2}$ and $\mathrm{Hf}{\mathrm{B}}_{2}{\mathrm{C}}_{2}$ nanosheets, which exhibit favorable mechanical and thermal properties. Young's moduli of $\mathrm{Ti}{\mathrm{B}}_{2}{\mathrm{C}}_{2}$ and $\mathrm{Hf}{\mathrm{B}}_{2}{\mathrm{C}}_{2}$ are 137.8 and 128.9 N/m, respectively. Both nanosheets could sustain up to 500 K based on our *ab initio* molec...

[Phys. Rev. B 102, 165404] Published Tue Oct 06, 2020

]]>Recent studies indicated that helical organic molecules, such as DNA and the $\alpha $-helical protein, can behave as Thouless quantum pumps when a rotating electric field is applied perpendicularly to their helical axes. Here we investigate the influence of long-range hoppings on this topological pumping o...

[Phys. Rev. B 102, 155402] Published Mon Oct 05, 2020

]]>We argue that edge electrons in monolayer $\mathrm{W}{\mathrm{Te}}_{2}$ can possess a “cooperative” orbital moment (COM) that critically impacts its edge magnetoresistance behavior. Arising from the cooperative action of both Rashba and Ising spin-orbit coupling, COM quickly achieves large magnitudes (of the order of a few ...

[Phys. Rev. B 102, 161402(R)] Published Mon Oct 05, 2020

]]>We present a first-principles study of pre-equilibrium stopping power and projectile charge capture in thin aluminum sheets irradiated by 6–60 keV protons. Our time-dependent density functional theory calculations reveal enhanced stopping power compared to bulk aluminum, particularly near the entran...

[Phys. Rev. B 102, 165401] Published Mon Oct 05, 2020

]]>The transport spectral function of electron-phonon ($e$-ph) interaction in the double $\delta $-function approximation (DDFA) is extensively employed to calculate the intrinsic resistivity (arising from $e$-ph scattering) of metallic materials in recent works of first-principles calculations. In contrast, a mor...

[Phys. Rev. B 102, 165402] Published Mon Oct 05, 2020

]]>We present a study of quasi-free-standing monolayer graphene obtained by intercalation of Au atoms at the interface between the carbon buffer layer (Bu-L) and the silicon-terminated face (0001) of $4H$-silicon carbide. Au intercalation is achieved by deposition of an atomically thin Au layer on the Bu...

[Phys. Rev. B 102, 165403] Published Mon Oct 05, 2020

]]>We consider a system of one-dimensional fermions moving in one direction, such as electrons at the edge of a quantum Hall system. At sufficiently long timescales the system is brought to equilibrium by weak interactions between the particles, which conserve their total number, energy, and momentum. ...

[Phys. Rev. B 102, 155401] Published Fri Oct 02, 2020

]]>An applied field can modulate optical signals by resonance shifting via the Stark effect. The optical Stark effect uses ultrafast light in the transparency region of a material to shift resonances with speeds limited by the pulse duration or system coherence. In this Rapid Communication, we investig...

[Phys. Rev. B 102, 161401(R)] Published Fri Oct 02, 2020

]]>Based on *ab initio* relativistic $\mathbf{k}\xb7\mathbf{p}$ theory, we derive an effective two-band model for surface states of three-dimensional topological insulators up to seventh order in $\mathbf{k}$. It provides a comprehensive description of the surface spin structure characterized by a nonorthogonality between momentum and sp...

[Phys. Rev. B 102, 115437] Published Wed Sep 30, 2020

]]>In this work we compute the torque field present in a ferromagnet in contact with a metallic nanowire when a skyrmion is present. If the nanowire is narrow enough, then the current is carried by a single conduction band. In this regime the classical torque model breaks down and we show that a skyrmi...

[Phys. Rev. B 102, 125436] Published Wed Sep 30, 2020

]]>In most studies on all-optical diodes, spatial asymmetry has been by necessity applied to break Lorentz reciprocity. Here we suggest a paradigm for optically induced nonreciprocity in semiconductor wires which are spatially asymmetry-free and provide a very simple and efficient platform for plasmoni...

[Phys. Rev. B 102, 115435] Published Mon Sep 28, 2020

]]>A Datta-Das spin field-effect transistor is built of a heterostructure with a Rashba spin-orbit interaction (SOI) at the interface (or quantum well) separating two possibly magnetized reservoirs. The particle and spin currents between the two reservoirs are driven by chemical potentials that are (po...

[Phys. Rev. B 102, 115436] Published Mon Sep 28, 2020

]]>Chirality manifests in various forms in nature. However, there is no evidence of the chirality in one-dimensional charge density wave (CDW) systems. Here, we have explored the chirality among quasi-one-dimensional CDW ground states with the aid of scanning tunneling microscopy, symmetry analysis, an...

[Phys. Rev. B 102, 121408(R)] Published Mon Sep 28, 2020

]]>We have observed intensity enhancement in exciton photoluminescence and $G$-band Raman scattering of suspended pristine semiconducting carbon nanotubes (CNTs) under resonant excitation while preventing surrounding dielectric Coulomb screening and emission quenching effects. Photoluminescence excitatio...

[Phys. Rev. B 102, 125432] Published Mon Sep 28, 2020

]]>Optical harmonic generation on excitons is found in ZnSe/BeTe quantum wells with type-II band alignment. Two experimental approaches with spectrally broad femtosecond laser pulses and spectrally narrow picosecond pulses are used for spectroscopic studies by means of second and third harmonic generat...

[Phys. Rev. B 102, 125433] Published Mon Sep 28, 2020

]]>Near-field radiative heat transfer between two bodies can exceed the far-field blackbody limitation predicted by Planck's law due to the evanescent waves tunneling or coupling of additional surface modes, which typically can occur only in TM modes for nonmagnetic materials. The Mie resonance may hav...

[Phys. Rev. B 102, 125434] Published Mon Sep 28, 2020

]]>We present a methodical study of grazing-incidence small-angle x-ray scattering performed *in situ* during pulsed-laser deposition of Pt on sapphire substrates. From measured two-dimensional intensity distributions in reciprocal space we calculated horizontal and vertical intensity projections and com...

[Phys. Rev. B 102, 125435] Published Mon Sep 28, 2020

]]>The relaxation time of a classical spin interacting with a large conduction-electron system is computed for a weak magnetic field, which initially drives the spin out of equilibrium. We trace the spin and the conduction-electron dynamics on a timescale which exceeds the characteristic electronic sca...

[Phys. Rev. B 102, 115434] Published Fri Sep 25, 2020

]]>We use the Wick-rotated time-dependent supersymmetry to construct models of two-dimensional Dirac fermions in the presence of an electrostatic grating. We show that there appears omnidirectional perfect transmission through the grating at specific energy. Additionally to being transparent for incomi...

[Phys. Rev. B 102, 115429] Published Thu Sep 24, 2020

]]>We present an experimental study on microwave illuminated high mobility MgZnO/ZnO based two-dimensional electron systems with different electron densities and, hence, varying Coulomb interaction strength. The photoresponse of the low-temperature dc resistance in perpendicular magnetic field is exami...

[Phys. Rev. B 102, 115432] Published Thu Sep 24, 2020

]]>In a joint experimental and theoretical study on metallic $\mathrm{Tb}{\mathrm{Si}}_{2}$ nanowires, we observe a continuous crossover from a two-dimensional (2D) to a quasi-one-dimensional (1D) electronic structure by reduction of the nanowire width. The nanowires were grown by self-organization on vicinal Si(111) substrate...

[Phys. Rev. B 102, 115433] Published Thu Sep 24, 2020

]]>Ortho-para conversion of molecularly chemisorbed ${\mathrm{H}}_{2}$ on a Pd(210) surface at a surface temperature of 50 K is reported. A combination of a pulsed molecular beam, photostimulated desorption, and resonance-enhanced multiphoton ionization techniques was used for probing the change in the rotational stat...

[Phys. Rev. B 102, 121407(R)] Published Thu Sep 24, 2020

]]>We investigate electron spin currents induced optically via plasmonic modes in the Kretschmann configuration. By utilizing the scattering matrix formalism, we take the plasmonic mode coupled to an external laser drive into consideration and calculate induced magnetization in the metal. The spatial d...

[Phys. Rev. B 102, 125431] Published Thu Sep 24, 2020

]]>Future quantum information devices will most likely rely on the realization of coherent light-matter interactions in strong coupling regime and the maintaining of the coherence with minimized incoherent damping pathways. Here, utilizing film-coupled planar nanoparticle supporting unique plasmon-indu...

[Phys. Rev. B 102, 115430] Published Wed Sep 23, 2020

]]>We theoretically describe how fast electrons couple to polaritonic modes in uniaxial materials by analyzing the electron energy-loss spectra. We show that in the case of a uniaxial medium with hyperbolic dispersion, bulk and surface modes can be excited by a fast electron traveling through the volum...

[Phys. Rev. B 102, 115431] Published Wed Sep 23, 2020

]]>We use a combination of microwave fields and free precession to drive the spin of a nitrogen-vacancy (NV) center in diamond on different trajectories on the Bloch sphere and investigate the physical significance of the frame-dependent decomposition of the total phase into geometric and dynamic parts...

[Phys. Rev. B 102, 125428] Published Wed Sep 23, 2020

]]>We study the magnon-mediated pairing between fermions on the surface of a topological insulator (TI) coupled to a ferromagnetic insulator with a tilted mean field magnetization. Tilting the magnetization toward the interfacial plane reduces the magnetic band gap and leads to a shift in the effective...

[Phys. Rev. B 102, 125429] Published Wed Sep 23, 2020

]]>In recent years, nonreciprocal transport measurement has emerged as a probe of spin orbit interaction, spin texture, superconductivity, and other fundamental properties of materials. Here, we study the nonlinear Hall effect (NLHE) in ${\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}/\mathrm{CoFeB}$ heterostructures measured by second harmonic voltage ...

[Phys. Rev. B 102, 125430] Published Wed Sep 23, 2020

]]>Usually, in optical spectra of double-walled carbon nanotubes (DWCNTs), weak van der Waals coupling between the layers leads only to a small shift of transition energies with respect to their values in pristine single-walled nanotubes. However, recent results have shown that the Rayleigh spectrum of...

[Phys. Rev. B 102, 115426] Published Tue Sep 22, 2020

]]>Using the first principles calculations, we analyze the structural and electronic properties of a ${\mathrm{PtSe}}_{2}$ monolayer on Pt substrate, obtained by direct selenization of the Pt(111) surface [Wang *et al.*, Nano Lett. **15**, 4013 (2015)]. We demonstrate that in order to reproduce the experimental result that...

[Phys. Rev. B 102, 115427] Published Tue Sep 22, 2020

]]>It has been well established that the presence of quantum-well states in metal thin films plays an essential role in determining the thickness dependence of many physical properties. Oscillatory features in these properties are often observed and attributed to the energy variations of these quantum-...

[Phys. Rev. B 102, 115428] Published Tue Sep 22, 2020

]]>We study the effect of anisotropy (strain) on dynamical gap generation in graphene. We work with a low energy effective theory obtained from a tight-binding Hamiltonian expanded around the Dirac points in momentum space. We use a nonperturbative Schwinger-Dyson approach and calculate a coupled set o...

[Phys. Rev. B 102, 125427] Published Tue Sep 22, 2020

]]>We study a flux qubit consisting of a symmetrical pair of superconducting loops, with two Josephson junctions in each, joined by a common Josephson junction—a ‘twin’ flux qubit. The qubit is capacitively coupled to a transmission line, which allows us to characterize the spectrum of the device by me...

[Phys. Rev. B 102, 115422] Published Mon Sep 21, 2020

]]>The violation of Wiedemann-Franz (WF) law has been widely discussed in quantum transport experiments as an indication of deviation from Fermi-liquid behavior. The conventional form of WF law is only concerned with the transmission function at the Fermi level, which, however, vanishes in many practic...

[Phys. Rev. B 102, 115423] Published Mon Sep 21, 2020

]]>Excitons, quasiparticles composed of an electron and a hole, play an important role in optical responses in low-dimensional nanostructures. In this work, we have investigated exciton diffusion in monolayer $\mathrm{Mo}{\mathrm{Se}}_{2}$ encapsulated between flakes of hexagonal boron nitride ($h\mathrm{BN}/\mathrm{MoS}{\mathrm{e}}_{2}/h\mathrm{BN}$). Through photolum...

[Phys. Rev. B 102, 115424] Published Mon Sep 21, 2020

]]>Helical molecules have recently attracted interest due to their capability for robust spin polarization of transmitted electrons. By means of mechanically controlled break Au junctions, we analyze the transport properties of single lysine-doped and cysteine-terminated polyalanine (PA) molecules of v...

[Phys. Rev. B 102, 115425] Published Mon Sep 21, 2020

]]>Intercalation of lithium atoms between layers of two-dimensional (2D) materials can alter their atomic and electronic structure. We investigate effects of Li intercalation in twisted bilayers of the transition metal dichalcogenide ${\mathrm{MoS}}_{2}$ through first-principles calculations, tight-binding parametriza...

[Phys. Rev. B 102, 125424] Published Mon Sep 21, 2020

]]>Solid-state experimental realizations of Majorana bound states are based on materials with strong intrinsic spin-orbit interactions. In this paper, we explore an alternative approach where spin-orbit coupling is induced artificially through a nonuniform magnetic field that originates from an array o...

[Phys. Rev. B 102, 125425] Published Mon Sep 21, 2020

]]>We study the band structure and transport property of a zigzag silicene nanoribbon when electric fields are applied to the edges. It is found that band bending could be induced and controlled by the antisymmetric edge fields, which can be understood based on the wave functions of the edge states. Th...

[Phys. Rev. B 102, 125426] Published Mon Sep 21, 2020

]]>The recent accessibility of high-quality, charge-neutral monolayer transition metal dichalcogenides with narrow exciton linewidths at the homogeneous limit provides an ideal platform to study excitonic many-body interactions. In particular, the possibility to manipulate coherent exciton-exciton inte...

[Phys. Rev. B 102, 115420] Published Fri Sep 18, 2020

]]>We study the electronic structure and topological properties of monolayer and the ABC-stacked multilayer of graphyne-$N$, which are a family of planar carbon sheets consisting of $sp$ and $s{p}_{2}$-bonding. By using the density-functional theory and the effective continuum model, we find a striking even-odd e...

[Phys. Rev. B 102, 115421] Published Fri Sep 18, 2020

]]>