We develop the theory of single-electron silicon spin qubit relaxation in the presence of a magnetic field gradient. Such field gradients are routinely generated by on-chip micromagnets to allow for electrically controlled quantum gates on spin qubits. We build on a valley-dependent envelope functio…

[Phys. Rev. B 106, 075415] Published Thu Aug 18, 2022

]]>The generation of spatially homogeneous spin polarization by application of electric current is a fundamental manifestation of symmetry-breaking spin-orbit coupling (SOC) in solid-state systems, which underpins a wide range of spintronic applications. Here, we show theoretically that twisted van der…

[Phys. Rev. B 106, L081406] Published Thu Aug 18, 2022

]]>We propose a quantum-mechanical model to calculate the nonlinear differential conductance of a single molecular junction immersed in a solvent, either in pure form or as a binary mixture with varying volume fraction. The solvent mixture is captured by a dielectric continuum model for which the resul…

[Phys. Rev. B 106, 075413] Published Wed Aug 17, 2022

]]>Weyl semimetals exhibit a myriad of exotic transport responses, among which, the Goos-Hänchen (GH) and Imbert-Fedorov (IF) effects have recently garnered substantial attention. Besides the usual parametric dependence inherited from the underlying Hamiltonian to describe a Weyl system, the IF shift p…

[Phys. Rev. B 106, 075414] Published Wed Aug 17, 2022

]]>Motivated by recent extensive studies on the $M{A}_{2}{Z}_{4}$ family materials, we have predicted three ${\mathrm{MoP}}_{2}{X}_{2}{Y}_{2}$-type monolayers, including ${\mathrm{MoP}}_{2}{\mathrm{B}}_{2}{\mathrm{Te}}_{2},{\mathrm{MoP}}_{2}{\mathrm{Al}}_{2}{\mathrm{S}}_{2}$, and ${\mathrm{MoP}}_{2}{\mathrm{Ga}}_{2}{\mathrm{S}}_{2}$, which possess excellent dynamic and thermal stabilities and peculiar electronic properties. According to first-principle calculations,…

[Phys. Rev. B 106, 085412] Published Wed Aug 17, 2022

]]>The electron-electron scattering does not affect the electrical current in Galilean-invariant systems. We show that, nevertheless, electron-electron collisions may contribute to the electric resistivity of systems with parabolic spectrum provided that they have multiply connected Fermi surfaces, and…

[Phys. Rev. B 106, 085411] Published Tue Aug 16, 2022

]]>A new photoelectric phenomenon, the in-plane photoelectric (IPPE) effect, has been recently discovered at terahertz (THz) frequencies in a $\mathrm{Ga}\mathrm{As}/{\mathrm{Al}}_{x}{\mathrm{Ga}}_{1-x}\mathrm{As}$ heterostructure with a two-dimensional (2D) electron gas [W. Michailow *et al.*, Sci. Adv. **8**, eabi8398 (2022)]. In contrast to the conventional PE…

[Phys. Rev. B 106, 075411] Published Mon Aug 15, 2022

]]>We study the Landau level (LL) structure and magneto-optical responses in the Weyl semimetal (WSM) quantum well in the presence of a non-uniform magnetic field (NUMF). The number of LLs in the NUMF is found to be finite, and the LL structure of the system is significantly affected by the inhomogenei…

[Phys. Rev. B 106, 075412] Published Mon Aug 15, 2022

]]>Electronic and transport properties of bilayer heterostructure under light irradiation are of fundamental interest to improve functionality of optoelectronic devices. We theoretically study the modification of transport properties of bilayer graphene and bilayer heterostructures under a time-periodi…

[Phys. Rev. B 106, 085409] Published Mon Aug 15, 2022

]]>We present first-principles results on the structural, electronic, and magnetic properties of a new family of two-dimensional antiferromagnetic (AFM) manganese chalcogenides, namely, monolayer $\mathrm{Mn}X$ and Janus $X\mathrm{Mn}Y$ ($X,Y=\mathrm{S}$, Se, Te), among which monolayer MnSe was recently synthesized in experiments [Aap…

[Phys. Rev. B 106, 085410] Published Mon Aug 15, 2022

]]>We demonstrate the scattering of laser light from two InAs quantum dots coupled to a photonic crystal waveguide, which is achieved by strain-tuning the optical transitions of the dots into mutual resonance. By performing measurements of the intensity and photon statistics of transmitted laser light …

[Phys. Rev. B 106, L081403] Published Mon Aug 15, 2022

]]>Analytical derivations and first-principles calculations are performed to investigate the electro-optic (EO) response of the two-dimensional ferroelectric SnS in its monolayer form. In addition to derive the formula for EO coefficients for two-dimensional systems, large linear and nonlinear electro-…

[Phys. Rev. B 106, L081404] Published Mon Aug 15, 2022

]]>Information about the magnetic properties of van der Waals ferromagnets comes so far largely from macroscopic techniques, with much less being known about the magnetism at the microscopic level. By comparing atomic-scale imaging of domain walls at the surface of the van der Waals ferromagnet Fe${}_{3-x}$GeTe${}_{2}$ with inelastic neutron scattering measurements of the magnon dispersion in the bulk, the authors elucidate here the interplay between the bulk and surface magnetism and image the low-energy electronic structure.

[Phys. Rev. B 106, L081405] Published Mon Aug 15, 2022

]]>We consider a hybrid quantum Hall-superconductor system, where a superconducting finger with oblique profile is wedged into a two-dimensional electron gas in the presence of a perpendicular magnetic field, as considered by Lee *et al.*, Nat. Phys. **13**, 693 (2017). The electron gas is in the quantum Ha…

[Phys. Rev. B 106, 075410] Published Fri Aug 12, 2022

]]>Many phenomena in physics, including light, water waves, and sound, are described by wave equations. Given their coefficients, wave equations can be solved to high accuracy, but the presence of the wavelength scale often leads to large computer simulations for anything beyond the simplest geometries…

[Phys. Rev. B 106, 085408] Published Thu Aug 11, 2022

]]>We derive the fundamental limit to near-field radiative thermal rectification mediated by an intrinsic semiconductor film within the framework of fluctuational electrodynamics. By leveraging the electromagnetic local density of states, we identify ${\varepsilon}_{\mathrm{H}}^{\u2033}/{\varepsilon}_{\mathrm{L}}^{\u2033}$ as an upper bound on the rectification magni…

[Phys. Rev. B 106, 075408] Published Wed Aug 10, 2022

]]>The photonic spin Hall effect is a manifestation of the spin-orbit interaction of light and can be measured by a transverse shift $\delta $ of photons with opposite spins. The precise measurement of transverse shifts can enable many spin-related applications, such as precise metrology and optical sensing. H…

[Phys. Rev. B 106, 075409] Published Wed Aug 10, 2022

]]>Light-hole (lh) excitons (Xlhs) in quantum wells (QWs) are hardly studied compared with heavy-hole (hh) excitons (Xhhs), mainly due to the difficulties of their experimental observation. In this paper, a comprehensive study of both types of excitons in high-quality GaAs/AlGaAs QWs of different width…

[Phys. Rev. B 106, 085407] Published Wed Aug 10, 2022

]]>Unidirectional transport and localized cyclotron motion are two opposite physical phenomena. Here, we study the interplay effects between them on nonreciprocal lattices subject to a magnetic field. We show that, in the long-wavelength limit, the trajectories of the wave packets always form closed or…

[Phys. Rev. B 106, L081402] Published Wed Aug 10, 2022

]]>The charged exciton recombination and their spin dynamics are studied in ultrathin InSb- and AlSb-based quantum wells (QWs) surrounded by an AlAs matrix characterized by an indirect band gap. Strong material intermixing was observed that results in the QWs being composed of a quaternary ${\mathrm{In}}_{x}{\mathrm{Al}}_{1-x}{\mathrm{Sb}}_{y}{\mathrm{A\dots}}_{}$

[Phys. Rev. B 106, 075407] Published Tue Aug 09, 2022

]]>We derive a criterion under which splitting of all eigenstates of an open $\mathrm{XYZ}$ Hamiltonian with boundary fields into two invariant subspaces, spanned by chiral shock states, occurs. The splitting is governed by an integer number, which has the geometrical meaning of the maximal number of kinks in the…

[Phys. Rev. B 106, 075406] Published Mon Aug 08, 2022

]]>While the growth of germanene has been extensively claimed on many substrates, their exact crystal structures remain controversial. Herein, we systematically explore the surface structures of Ge deposition onto the Al(111) surface by theoretical calculations combined with available scanning tunnelin…

[Phys. Rev. B 106, 075405] Published Thu Aug 04, 2022

]]>Edge states of two-dimensional topological insulators are helical and single-particle backscattering is prohibited by time-reversal symmetry. In this paper, we show that an isotropic exchange coupling of helical edge states (HES) to a spin 1/2 impurity subjected to a magnetic field results in charac…

[Phys. Rev. B 106, 085406] Published Thu Aug 04, 2022

]]>Graphene on $h$-BN (G/hBN) has a long period moiré superstructure owing to the lattice mismatch between two materials. The long periodic potential caused by the moiré superstructure induces modulation of the electronic properties of the system. In this paper, we numerically calculate the optical condu…

[Phys. Rev. B 106, 075403] Published Wed Aug 03, 2022

]]>We investigate the electron transport and the waiting time distribution (WTD) in a topological superconducting Coulomb island system weakly coupled to two metallic leads. A pair of Majorana bound states are hosted in the island with a finite charging energy. By employing the Markovian master equatio…

[Phys. Rev. B 106, 075404] Published Wed Aug 03, 2022

]]>The understanding and modeling of heat transport across nanometer and subnanometer gaps, where the distinction between thermal radiation and conduction becomes blurred, remains an open question. In this work, we present a three-dimensional atomistic simulation framework by combining the molecular dy…

[Phys. Rev. B 106, 085403] Published Wed Aug 03, 2022

]]>We consider square and equilateral triangular open acoustic resonators with the ${C}_{4v}$ and ${C}_{3v}$ symmetries, respectively. There is a unique property of square and triangular resonators of accidental number fourfold degeneracy of eigenstates that gives rise to twofold-degenerate Friedrich-Wintgen (FW) bo…

[Phys. Rev. B 106, 085404] Published Wed Aug 03, 2022

]]>We use the nonequilibrium bosonization technique to study the effects of Coulomb interactions in mesoscopic electron colliders based on quantum Hall edge states at filling factor $\nu =2$. The current cross correlations and Fano factor, which carry the information about the exclusion statistics, are calc…

[Phys. Rev. B 106, 085405] Published Wed Aug 03, 2022

]]>Due to its transparent and highly dispersive nature, plasmonically induced transparency (PIT) has become an attractive field in the on-chip control of light. Conventional methods to achieve PIT are only limited to the lowest dipole-dipole or dipole-combined quadrupole modes by breaking structural sy…

[Phys. Rev. B 106, 075401] Published Tue Aug 02, 2022

]]>Two-dimensional ${\mathrm{CP}}_{2}$ and ${\mathrm{Li}}_{x}{\mathrm{CP}}_{2}$ ($x=1$ and 2) monolayers with high-mobility transport anisotropy, and tunable electronic and optical properties were identified through density-functional theory calculations. Our results indicate that the carrier mobility of ${\mathrm{CP}}_{2}$ monolayer is highly anisotropic with high…

[Phys. Rev. B 106, 075402] Published Tue Aug 02, 2022

]]>It is known that in two-dimensional relativistic Dirac systems placed in orthogonal uniform magnetic and electric fields, the Landau levels collapse as the applied in-plane electric field reaches a critical value $\pm {E}_{c}$. We study this phenomenon for a distinct field configuration with in-plane constant…

[Phys. Rev. B 106, 085401] Published Tue Aug 02, 2022

]]>Coherent control steers a quantum system from an initial state to a target state by controlling quantum interference phenomena via an external field, which is central to vast applications ranging from quantum information processing to attosecond physics. Here, we analyze the quantum pathways interfe…

[Phys. Rev. B 106, 085402] Published Tue Aug 02, 2022

]]>Mismatched lattice constants at a van der Waals epitaxy interface often introduce in-plane strains to the lattice of the epitaxial layer, termed epitaxy strain, wherein the strains do not follow the intralayer Poisson's relation. In this study, we obtained the magnetic phase diagrams of ${\mathrm{CrSe}}_{2}$ and ${\mathrm{Cr\dots}}_{}$

[Phys. Rev. B 106, L081401] Published Mon Aug 01, 2022

]]>Quasi-two-dimensional objects appear to be promising for the development of new optical devices since their electronic properties are expected to be governed by their size. The understanding of these properties can be achieved by means of theoretical spectroscopy based on the state-of-the-art *ab ini…*

[Phys. Rev. B 106, 035431] Published Fri Jul 29, 2022

]]>We theoretically investigate the mapping of the supercurrent distribution in a planar superconductor-normal-superconductor junction in the presence of a perpendicular magnetic field via the scanning gate microscopy technique. We find that the distribution of counterpropagating supercurrents aligned …

[Phys. Rev. B 106, 035432] Published Fri Jul 29, 2022

]]>Second-order photon correlation measurements [${g}^{\left(2\right)}\left(\tau \right)$ functions] are widely used to classify single-photon emission purity in quantum emitters or to measure the multiexciton quantum yield of emitters that can simultaneously host multiple excitations – such as quantum dots – by evaluating the value o…

[Phys. Rev. B 106, 045425] Published Fri Jul 29, 2022

]]>A giant built-in electric field in the growth direction makes excitons in wide GaN/(Al, Ga)N quantum wells spatially indirect even in the absence of any external bias. Significant densities of indirect excitons can accumulate in electrostatic traps imprinted in the quantum well plane by a thin metal…

[Phys. Rev. B 106, 035429] Published Thu Jul 28, 2022

]]>Time-dependent control of superconducting quantum circuits is a prerequisite for building scalable quantum hardware. The quantum description of these circuits is complicated due to the electromotive force (emf) induced by time-varying magnetic fields. Here, we examine how the emf modifies the fracti…

[Phys. Rev. B 106, 035430] Published Thu Jul 28, 2022

]]>Two-monolayer-thick In film with a $\surd 7\times \surd 3$-rect structure is known to show superconductivity at 3.18 K on the $\mathrm{Si}\left(111\right)7\times 7$ substrate. We synthesized the $\surd 7\times \surd 3$-In-rect film on the $\mathrm{Si}\left(111\right)\surd 3\times \surd 3\text{\u2212}\mathrm{B}$ substrate and found that it also became a superconductor at ${T}_{c}$ = 2.38 K. The In film on the $\surd 3\text{\u2212}\mathrm{B}$ substrate sho…

[Phys. Rev. B 106, 045423] Published Thu Jul 28, 2022

]]>The quantum Hall effect in three-dimensional Weyl semimetal (WSM) receives significant attention for the emergence of the Fermi loop where the underlying two-dimensional Hall conductivity, namely, sheet Hall conductivity, shows quantized plateaus. In tilt multi-Weyl semimetals (mWSMs) lattice models…

[Phys. Rev. B 106, 045424] Published Thu Jul 28, 2022

]]>The non-Hermitian skin effect (NHSE) in non-Hermitian lattice systems, associated with a point gap on the complex energy plane, has attracted great theoretical and experimental interest. Much less is studied on the so-called second-order non-Hermitian skin effect, where the bulk does not support a p…

[Phys. Rev. B 106, 035425] Published Wed Jul 27, 2022

]]>Auxetic materials, with negative Poisson's ratio (NPR), exhibit enhanced fracture toughness and shear resistance, due to their unusual mechanical behavior. Although a considerable number of two-dimensional (2D) NPR materials have been predicted theoretically, most of these materials have only in-pla…

[Phys. Rev. B 106, 035426] Published Wed Jul 27, 2022

]]>Hybrid quantum dot structures are potential building blocks for spintronic devices and quantum logic gates, within which the understanding of many-body correlations is a prerequisite for implementing quantum information processing and generating controlled entanglement. Herein, we consider a hybrid …

[Phys. Rev. B 106, 035428] Published Wed Jul 27, 2022

]]>A hybrid setup consisting of a superconductivity-proximitized quantum spin Hall insulator and a quantum anomalous Hall (QAH) insulator is proposed for chiral injection of electrons into the Majorana bound state (MBS). An unexplored region of the phase space involving the Zeeman-field-induced boost o…

[Phys. Rev. B 106, 045422] Published Wed Jul 27, 2022

]]>In novel ultrapure materials electrons can form a viscous fluid, which is fundamentally different in its dynamics from the electron gas in ordinary conductors with a significant density of defects. The shape of the nonstationary flow of such an electron fluid is similar to the alternating flow of bl…

[Phys. Rev. B 106, L041407] Published Wed Jul 27, 2022

]]>The recent discovery of the quantum nonlinear Hall effect has revived the field of nonlinear transport. Here, we investigate the magnetic-field-induced nonlinear transport in time reversal symmetric Weyl semimetals. We show that the interplay of the band-geometric quantities, such as the Berry curva…

[Phys. Rev. B 106, 035423] Published Tue Jul 26, 2022

]]>The conductance of electrostatic wire junctions in bilayer graphene, classified as trivial-trivial or trivial-topological regarding the confinement character on each junction side, is calculated. The topological side always corresponds to a kink-antikink system, as required for a proper connection w…

[Phys. Rev. B 106, 035424] Published Tue Jul 26, 2022

]]>We study the behavior of equilibrium spin currents near the magic angles of twisted bilayer and trilayer graphene in the presence of Rashba spin-orbit coupling. There is a substantial difference in the properties of local observables in twisted graphene layers, as compared with those in single and/o…

[Phys. Rev. B 106, L041406] Published Tue Jul 26, 2022

]]>Superconductivity is caused by the binding of electrons into Cooper pairs, which requires an attractive “pairing glue” to overcome Coulomb repulsion. Usually this attraction is mediated by bosonic fluctuations such as phonons or spin waves. Here, the authors numerically demonstrate the viability of another possibility: band topology can force electrons to bind into charge-2$e$ topological textures, skyrmions. Using density matrix renormalization group calculations to solve for the ground state of the Coulomb interaction projected into topological bands, the authors show that the lowest-energy charged excitations are skyrmions that superconduct at finite density, thereby illustrating a distinct all-electronic mechanism for superconductivity.

[Phys. Rev. B 106, 035421] Published Mon Jul 25, 2022

]]>We explore the possibility of the existence of plasmonically generated electronic Floquet bands at metal surfaces by studying the gauge transformed electron-surface plasmon interaction in the prepumped plasmonic coherent state environment. These bands may promote non-Einsteinian electron emission fr…

[Phys. Rev. B 106, 035422] Published Mon Jul 25, 2022

]]>The photoluminescence (PL) properties of metallic single-walled carbon nanotubes were investigated. Steady-state measurements showed interband excitonic PL in the first hyperbolic dispersion region. The decay kinetics of this interband excitonic PL was observed by femtosecond time-resolved measureme…

[Phys. Rev. B 106, 045421] Published Mon Jul 25, 2022

]]>We study the Magnus transport in a gapped two-dimensional electron gas with Rashba spin-orbit coupling using semiclassical Boltzmann transport formalism. Apart from its signature in the charge transport coefficients, the inclusion of Magnus velocity in the spin current operator enables us to study M…

[Phys. Rev. B 106, 035420] Published Fri Jul 22, 2022

]]>We investigate the response of the optically generated spin current as a function of time at the graphene edge for a possible application of optospintronic devices. The spin current is generated by optically excited edge plasmon in which the induced electric field is rotating on the graphene plane. …

[Phys. Rev. B 106, 045420] Published Fri Jul 22, 2022

]]>We investigate electronic transport in graphene nanoelectromechanical systems, known also as graphene nanodrums or nanomembranes. We demonstrate that these devices, despite their small values of strain between $0.1\%$ and $1\%$, can be used as efficient and robust valley polarizers and filters. Their work…

[Phys. Rev. B 106, 035416] Published Thu Jul 21, 2022

]]>Very recently, Janus two-dimensional (2D) materials have gathered enormous attention due to possessing unique properties caused by the lack of out-of-plane symmetry. Herein, based on the successful fabrication of 2D ${\mathrm{MoSi}}_{2}{\mathrm{N}}_{4}$ monolayer, we have reported 12 novel Janus ${M\mathrm{Si}}_{2}{\mathrm{P}}_{x}{\mathrm{As}}_{y}$ ($M$ = Mo, W; and $x+y=4$) …

[Phys. Rev. B 106, 035417] Published Thu Jul 21, 2022

]]>Silicon nanochannel plates (NCPs) are employed in a variety of experiments as sources of cold positronium (Ps) via positron to Ps conversion. Despite the widespread use of NCPs, no comprehensive model of the dynamics of the cooling process of Ps within the nanochannels has been provided yet. In this…

[Phys. Rev. B 106, 035418] Published Thu Jul 21, 2022

]]>We investigate optical effects in a three-level $V$-type quantum system involving two closely situated upper levels (a doublet), interacting with a weak probe field while located near a two-dimensional array of metal-coated dielectric nanospheres. We demonstrate that the presence of the plasmonic nano…

[Phys. Rev. B 106, 035419] Published Thu Jul 21, 2022

]]>The quantum anomalous Hall effect (QAHE) realizes dissipationless longitudinal resistivity and quantized Hall resistance without the need of an external magnetic field. However, when reducing the device dimensions or increasing the current density, an abrupt breakdown of the dissipationless state oc…

[Phys. Rev. B 106, 045419] Published Thu Jul 21, 2022

]]>The assignment of epitaxy types by Wang *et al.* [Phys. Rev. B **103**, 245430 (2021)] is critically examined. In particular, a ${\mathrm{C}}_{60}$ phase grown on Cd(0001) is denoted by them as “incommensurate”; however, it is most likely higher order commensurate. The crucial distinction between these epitaxy types is d…

[Phys. Rev. B 106, 047401] Published Thu Jul 21, 2022

]]>Intrinsic ripples with various configurations and sizes were reported to affect the physical and chemical properties of two-dimensional (2D) materials. By performing molecular dynamics simulations and theoretical analysis, we use two geometric models of the ripple shape to explore numerically the di…

[Phys. Rev. B 106, 045418] Published Tue Jul 19, 2022

]]>We examine the transport properties of magnetically doped topological insulator (TI) thin films subject to correlated nonmagnetic disorder. For the disorder we choose a quasiperiodic potential with a random phase. We restrict the disorder to a central region, which is coupled to two leads in a clean…

[Phys. Rev. B 106, 045417] Published Mon Jul 18, 2022

]]>Atomic sandwiches consisting of In layers with coverages ranging from $\sim 0.5$ to $\sim 2.5$ monolayers atop a single-atomic-layer ${\mathrm{NiSi}}_{2}$ have been grown on Si(111) and have been explored using a set of experimental techniques, i.e., scanning tunneling microscopy, angle-resolved photoelectron spectroscopy, and…

[Phys. Rev. B 106, 035415] Published Fri Jul 15, 2022

]]>The anomalous Hall effect (AHE) has been extended into the nonlinear regime, where the Hall voltage shows higher-order response to the applied current. Nevertheless, the microscopic mechanism of the nonlinear AHE remains unclear. Here we report the orbital polarization and its induced third-order AH…

[Phys. Rev. B 106, 045414] Published Fri Jul 15, 2022

]]>Plasmonic waveguides provide an integrated platform to develop efficient nanoscale ultrafast photonic devices. Although metals display a rich variety of nonlocal optical effects and surface nonlinearities, the study of plasmonic waveguides has been limited to considering conventional bulk nonlineari…

[Phys. Rev. B 106, 045415] Published Fri Jul 15, 2022

]]>Actively tunable nanodevices play an important role in modern photonics systems. Metasurfaces based on phase-change materials (PCMs) provide a new way for the realization of such devices. At present, the PCM is usually integrated with the resonant metasurfaces with low $Q$ factor or as a resonator to …

[Phys. Rev. B 106, 045416] Published Fri Jul 15, 2022

]]>Resonant optical responses of anisotropic molybdenum disulfide (${\mathrm{MoS}}_{2}$) nanoparticles (NPs) and their two-dimensional arrays (metasurfaces) are investigated. The nanoparticles in the form of disks with holes and with ${\mathrm{MoS}}_{2}$ layers oriented perpendicular to the disk's basis (in-plane material anisotropy)…

[Phys. Rev. B 106, 035412] Published Thu Jul 14, 2022

]]>The combination of two-dimensional Dirac surface states with $s$-wave superconductivity is expected to generate localized topological Majorana zero modes in vortex cores. Putative experimental signatures of these modes have been reported for heterostructures of proximitized topological insulators, iro…

[Phys. Rev. B 106, 035413] Published Thu Jul 14, 2022

]]>We investigate Majorana modes in a quantum spin chain with bond-dependent exchange interactions by studying its dynamics. Specifically, we consider two-time correlations for the anisotropic Kitaev-Heisenberg (KH) Hamiltonian close to the so-called Kitaev critical point. Here the model coincides with…

[Phys. Rev. B 106, 035414] Published Thu Jul 14, 2022

]]>We study the low-energy single-electron transport across a junction of two magnetic Weyl semimetals, in which the anisotropy axes are tilted one respect to the other. Using a two-band model with a potential step, we compute the transmission factor for normal and Klein tunneling and the refraction pr…

[Phys. Rev. B 106, 045413] Published Thu Jul 14, 2022

]]>We investigate the possibility of achieving valley filtering and enhanced negative differential resistance (NDR) in transition metal dichalcogenide (TMD)-based optoelectronic superlattice (SL). The multipeak NDR is predicted to occur in this system, the operation window of which is controlled succes…

[Phys. Rev. B 106, 035411] Published Tue Jul 12, 2022

]]>Several papers have reported the epitaxial growth of germanene, a honeycomb layer of Ge atoms. However, these studies are controversial due to a lack of precise structural analyses. Here, the authors combine surface x-ray diffraction with density functional theory calculations to demonstrate that Ge deposited on Al(111) at room temperature forms a surface alloy, organized in a Ge${}_{3}$Al${}_{3}$ honeycomb structure, and not a germanene layer as previously reported.

[Phys. Rev. B 106, 045412] Published Tue Jul 12, 2022

]]>Atomistic approaches enable computational studies ofnanostructures with unusual properties. Here, the authors showthat the indium phosphate zinc-blende section embedded in a wurtzitenanowire, thus forming so-called crystal phase quantum dots, mayexhibit a rare antibonding hole ground state. The authors also findthat even a small lattice mismatch at the wurtzite/zinc-blendeinterface can profoundly mix the lowest hole states, resulting inunusual double-peak features in the excitonic optical spectra. Furtherresearch is, however, needed to determine strained band offsets inpolytype homostructures, allowing for better agreement betweenexperiment and theory.

[Phys. Rev. B 106, L041405] Published Tue Jul 12, 2022

]]>Dissipative dynamics of quantum systems can be classified topologically based on the correspondence between the Lindbladian in the Gorini-Kossakowski-Sudarshan-Lindblad equation and the non-Hermitian Hamiltonian in the Schrödinger equation. While general non-Hermitian Hamiltonians are classified int…

[Phys. Rev. B 106, 035408] Published Mon Jul 11, 2022

]]>We aim to illuminate how the microscopic properties of a metal surface map to its electric field noise characteristics. In our system, prolonged heat treatments of a metal film can induce a rise in the magnitude of the electric field noise generated by the surface of that film. We refer to this heat…

[Phys. Rev. B 106, 035409] Published Mon Jul 11, 2022

]]>Surface-enhanced Raman scattering (SERS) is based on the ability of a surface substrate to increase Raman signals for sensing and imaging applications. The most widely used Au and Ag SERS substrates are primarily based on the electromagnetic mechanism (EM) with large enhancement factors (EFs), which…

[Phys. Rev. B 106, 035410] Published Mon Jul 11, 2022

]]>Twisted layers of atomically thin two-dimensional materials realize a broad range of quantum materials with engineered optical and transport phenomena arising from spin and valley degrees of freedom and strong electron correlations in hybridized interlayer bands. Here, we report on experimental and …

[Phys. Rev. B 106, 045411] Published Mon Jul 11, 2022

]]>Heterobilayer transition metal dichalcogenide (TMDC) moiré systems provide an ideal framework to investigate strongly correlated physics. Here we theoretically study bosonic many-body phases of excitons in moiré TMDCs. By using two moiré models and cluster mean-field theory, we reveal that, due to n…

[Phys. Rev. B 106, 035406] Published Fri Jul 08, 2022

]]>We analyze the confinement of electronic surface states in a model of a topological insulator nanowire. Spin-momentum locking in the surface states reduces unwanted backscattering in the presence of nonmagnetic disorder and is known to counteract localization for certain values of magnetic flux thre…

[Phys. Rev. B 106, 035407] Published Fri Jul 08, 2022

]]>We theoretically investigate the escape rate occurring via quantum tunneling in a system affected by tailored dissipation. Specifically, we study the environmental assisted quantum tunneling of the superconducting phase in a current-biased Josephson junction. We consider Ohmic resistors inducing dis…

[Phys. Rev. B 106, 045408] Published Fri Jul 08, 2022

]]>In atomically thin semiconductors based on transition metal dichalcogenides, photoexcitation can be used to generate high densities of electron-hole pairs. Due to optical nonlinearities, which originate from Pauli blocking and many-body effects of the excited carriers, the generated carrier density …

[Phys. Rev. B 106, 045409] Published Fri Jul 08, 2022

]]>We investigate the dynamical effects of a magnetic flux quench in the Su-Schrieffer-Heeger model in a one-dimensional ring geometry. We show that even when the system is initially in the half-filled insulating state, the flux quench induces a time-dependent current that eventually reaches a finite s…

[Phys. Rev. B 106, 045410] Published Fri Jul 08, 2022

]]>The broad tunability of the proximity exchange effect between transition-metal dichalcogenides (TMDCs) and chromium iodide (${\mathrm{CrI}}_{3}$) heterostructures offers intriguing possibilities for the use of TMDCs in two-dimensional magnetoelectrics. In this work, the influence of the twist angle and the gate ele…

[Phys. Rev. B 106, 045406] Published Thu Jul 07, 2022

]]>Mean-field theories have since long predicted edge magnetism in graphene nanoribbons, where the order parameter is given by the local magnetization. However, signatures of edge magnetism appear elusive in the experiments, suggesting another class of solutions. We employ a self-consistent mean-field …

[Phys. Rev. B 106, 045407] Published Thu Jul 07, 2022

]]>Graphene features topological edge bands that connect a pair of Dirac points through either sector of the one-dimensional Brillouin zone depending on edge configurations (zigzag or bearded). Because of their flat dispersion, spontaneous edge magnetization can arise from Coulomb interaction in graphe…

[Phys. Rev. B 106, 045405] Published Wed Jul 06, 2022

]]>We present a study of the nonlinear optical response of twisted bilayer graphene. We discuss the contribution of the Berry phase to the nonlinearity when inversion symmetry is broken, thus underlining the interplay between band and real-space geometry, and nonlinear response. We also highlight an ef…

[Phys. Rev. B 106, 035401] Published Tue Jul 05, 2022

]]>Machine-learning generative methods for material design are constructed by representing a given chemical structure, either a solid or a molecule, over appropriate atomic features, generally called structural descriptors. These must be fully descriptive of the system, must facilitate the training pro…

[Phys. Rev. B 106, 035402] Published Tue Jul 05, 2022

]]>Valley-related multiple Hall effect in two-dimensional (2D) lattice is a fundamental transport phenomenon in the fields of condensed matter physics and materials science. Most proposals for its realization are limited to toy models or extrinsic effects. Here, based on a tight-binding model and first…

[Phys. Rev. B 106, 035403] Published Tue Jul 05, 2022

]]>Usually the Josephson current is driven by the superconducting phase difference $\phi $ between two superconducting leads. Here we propose an anomalous Josephson current between two Majorana nanowires, which can be driven by both the superconducting phase difference $\phi $ and the orientation difference $\varphi $ betw…

[Phys. Rev. B 106, 035404] Published Tue Jul 05, 2022

]]>Geometric energy transport is of high interest both for spectroscopy of quantum devices and as a way to realize cyclic thermal machines at the nanoscale. Using a recently discovered dissipative symmetry, this work derives compact and insightful analytical expressions characterizing energy pumping with a slowly driven quantum dot subject to strong many-body interactions. Equipped with these results, the authors analyze the dot as a refrigerator or a heat pump, revealing a direct link between its efficiency and its well-known steady-state thermoelectric properties.

[Phys. Rev. B 106, 035405] Published Tue Jul 05, 2022

]]>The recent higher-order topological insulators (HOTIs) encoded with the tight-binding model (TBM) have been demonstrated beyond traditional bulk-edge correspondence, which shows the exotic capability of sound manipulation. However, the current waveguide resonator model with weak tunability in hoppin…

[Phys. Rev. B 106, 045403] Published Tue Jul 05, 2022

]]>The *ab initio* electromagnetic theory of Fano resonances in resonant plasmonic nanostructures and metamaterials, developed by Gallinet and Martin [Phys. Rev. B **83**, 235427 (2011)], is generalized to the case of double Fano resonances. A system is considered in which two uncoupled nonradiative modes in…

[Phys. Rev. B 106, 045404] Published Tue Jul 05, 2022

]]>We analytically derived an explicit condition for high-contrast plasmonic modulation and switchable routing in coupled graphene waveguides consisting of two coupled gated graphene sheets sandwiching a gyrotropic medium. The analytical condition intuitively predicts that by manipulating the graphene …

[Phys. Rev. B 106, L041401] Published Tue Jul 05, 2022

]]>We consider the fate of the Wigner crystal state in a two-dimensional system of massive Dirac electrons as the effective fine structure constant $\alpha $ is increased. In a Dirac system, larger $\alpha $ naively corresponds to stronger electron-electron interactions, but it also implies a stronger interband dielec…

[Phys. Rev. B 106, L041402] Published Tue Jul 05, 2022

]]>We develop an analytic model for an ideal polyyne ring which describes the induced terahertz (THz) gap in the molecular spectrum due to the Stark effect. This simple model can also be used to describe an odd-dimered cyclocarbon which has undergone a spontaneous symmetry-breaking event (due to the Ja…

[Phys. Rev. B 106, L041403] Published Tue Jul 05, 2022

]]>The spin-dependence of the strongly correlated phenomena and many-body interactions play an important role in quantum information science. In particular, it is quite interesting but unclear how the spin degree of freedom ramifies the bandgap renormalization, one of the fundamental many-body phenomen…

[Phys. Rev. B 106, L041404] Published Tue Jul 05, 2022

]]>In analogy to the Su-Schrieffer-Heeger (SSH) model, one-dimensional (1D) electromagnetic (EM) crystals can exhibit nontrivial topological properties. When a nontrivial EM crystal is in contact with its trivial counterpart, a topologically protected interface state is formed. While much attention has…

[Phys. Rev. B 106, 045401] Published Fri Jul 01, 2022

]]>We investigate the potential of supervised machine learning to propagate a quantum system in time. While Markovian dynamics can be learned easily, given a sufficient amount of data, non-Markovian systems are nontrivial and their description requires the memory knowledge of past states. Here we analy…

[Phys. Rev. B 106, 045402] Published Fri Jul 01, 2022

]]>The $p\text{\u2212}d$ hybridization of transition metal impurities in a semiconductor host is the mechanism that couples valence-band electrons and localized spins. We use scanning tunneling microscopy and spectroscopy combined with density functional theory to probe at the atomic-scale hybridization of Cr single…

[Phys. Rev. B 105, 235443] Published Thu Jun 30, 2022

]]>In this paper a covalent assembly of two two-dimensional (2D) materials is investigated. It is shown that borophene with periodic perforation (as one of numerous 2D boron nanoallotropes) and graphenylene can form the vertical heterostructure. This borophene-graphenylene bilayer reduces the dynamic i…

[Phys. Rev. B 105, 235444] Published Thu Jun 30, 2022

]]>The discovery of ferroelectric behavior in twisted bilayers without inversion symmetry has prompted the consideration of some moiré heterostructures as polar materials. However, misconceptions about the nature and origin of the observed ferroelectricity indicate that a better theoretical understandi…

[Phys. Rev. B 105, 235445] Published Thu Jun 30, 2022

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