By using optical absorption and Raman spectroscopy, we have investigated the effects of pressure in the structural, electronic, and vibrational properties of ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ in the 0–20 GPa range. Our study has provided a complete characterization of the electronic and vibrational structures of ${\mathrm{Cs}}_{2}{\mathrm{CuCl}}_{4}$ in...

[Phys. Rev. B 99, 134106] Published Thu Apr 18, 2019

]]>The authors construct an efficient algorithm for extracting the entanglement structure of wave functions in the form of a cluster decomposition. They apply this to the many-body localization problem by analyzing entanglement clusters in exact eigenstates. Strongly entangled ergodic clusters are connected. Their size is distributed according to a power law at the transition, while at higher disorder the distribution is a stretched exponential. This constrains possible phenomenological renormalization group descriptions of the transition, and is consistent with a Kosterlitz-Thouless type scaling.

[Phys. Rev. B 99, 134205] Published Thu Apr 18, 2019

]]>We find the charge and heat currents caused by a temperature difference applied to a superconducting point contact or to a quantum point contact between a superconducting and normal conductors. The results are formulated in terms of the properties of the electron scattering matrix of the quantum poi...

[Phys. Rev. B 99, 134514] Published Thu Apr 18, 2019

]]>The effects of current induced Néel spin-orbit torques on the antiferromagnetic domain structure of epitaxial ${\mathrm{Mn}}_{2}\mathrm{Au}$ thin films were investigated by x-ray magnetic linear dichroism–photoemission electron microscopy. We observed current induced switching of antiferromagnetic domains essentially corres...

[Phys. Rev. B 99, 140409(R)] Published Thu Apr 18, 2019

]]>How does one detect the Meissner effect in ultrathin superconducting films that are usually extremely sensitive to air? Here, the authors succeed in observing the diamagnetic response of a superconducting surface superstructure by using an $i\phantom{\rule{0}{0ex}}n\phantom{\rule{0.333em}{0ex}}s\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}u$ two-coil mutual inductance technique embedded in a specially designed scanning tunneling microscope. The diamagnetic measurement allows for the calculation of the penetration depth, which provides invaluable information about the nature of superconductivity and the symmetry of the underlying order parameter.

[Phys. Rev. B 99, 140506(R)] Published Thu Apr 18, 2019

]]>Hydrodynamic flow in two-dimensional electron systems has so far been probed only by dc transport and scanning gate microscopy measurements. In this work we discuss theoretically signatures of the hydrodynamic regime in near-field optical microscopy. We analyze the dispersion of acoustic plasmon mod...

[Phys. Rev. B 99, 144307] Published Thu Apr 18, 2019

]]>Superfluidity has recently been reported in double electron-hole bilayer graphene. The multiband nature of the bilayers is important because of the very small band gaps between conduction and valence bands. The long-range nature of the superfluid pairing interaction means that screening must be full...

[Phys. Rev. B 99, 144517] Published Thu Apr 18, 2019

]]>Matrix product states (MPSs), a tensor network designed for one-dimensional quantum systems, were recently proposed for generative modeling of natural data (such as images) in terms of the “Born machine.” However, the exponential decay of correlation in MPSs restricts its representation power heavil...

[Phys. Rev. B 99, 155131] Published Thu Apr 18, 2019

]]>We report systematic temperature- and doping-dependent measurements of the $\mathrm{Fe}\phantom{\rule{0.28em}{0ex}}3s$ core-level photoemission spectra in the normal state of superconducting $\mathrm{Sr}{\left(\mathrm{F}{\mathrm{e}}_{1-x}\mathrm{C}{\mathrm{o}}_{x}\right)}_{2}\mathrm{A}{\mathrm{s}}_{2}$. The analysis of the $\mathrm{Fe}\phantom{\rule{0.28em}{0ex}}3s$ spectrum provides an element-specific determination of the mean value of the magnitude of the Fe spin mom...

[Phys. Rev. B 99, 155132] Published Thu Apr 18, 2019

]]>Scanning tunneling microscopy unveils an unprecedented energy-dependent patchwork of charge density wave (CDW) regions in 1$T$-Cu${}_{x}$TiSe${}_{2}$. This Cu-induced patterning is echoing a large CDW gap opening below the Fermi level. It suggests a possible coexistence of the CDW and superconducting ground states, as the two quantum condensates involve different energy ranges in the electronic band structure of Cu${}_{x}$TiSe${}_{2}$. Finally, the well-developed CDW order in Cu-doped metallic Cu${}_{x}$TiSe${}_{2}$ rules out a solely excitonic CDW formation mechanism in this system.

[Phys. Rev. B 99, 155133] Published Thu Apr 18, 2019

]]>We study the transport properties of a Wigner crystal in one- and two-dimensional asymmetric periodic potentials. We show that the Aubry transition takes place above a certain critical amplitude of potential with the sliding and pinned phase below and above the transition. Due to the asymmetry the A...

[Phys. Rev. B 99, 155416] Published Thu Apr 18, 2019

]]>Motivated by recent transport measurements in high-${T}_{c}$ cuprate superconductors in a magnetic field, we study the thermal Hall conductivity in materials with topological order, focusing on the contribution from neutral spinons. Specifically, different Schwinger boson mean-field *Ansätze* for the Heisenb...

[Phys. Rev. B 99, 165126] Published Thu Apr 18, 2019

]]>Advances in nanofabrication have recently made possible plasmonic nanostructures with features on very short length scales, enabling confinement of electromagnetic fields even to subnanometric scales. On this atomic scale, a classical local description of the dielectric function is no longer valid and effects such as electron spill-out at metal surfaces become relevant. Here, the authors take this nonlocal effect into account for singular plasmic metasurfaces with sharp features, such as narrow gaps and sharp edges. Nonlocal effects are prominent in these geometric singularities and lead to a discretization of the continuous spectrum. On the surface, the oscillation of the surface plasmon polaritons propagating toward the singularity is weakened, and this microscopic effect significantly affects the far-field spectrum.

[Phys. Rev. B 99, 165423] Published Thu Apr 18, 2019

]]>[Phys. Rev. B 99, 169906] Published Thu Apr 18, 2019

]]>[Phys. Rev. B 99, 169907] Published Thu Apr 18, 2019

]]>Using a combination of density functional theory calculations and molecular dynamics simulations we show that the strength and toughness of hexagonal boron nitride (hBN) containing isolated vacancy defects are strongly anisotropic, regardless of the size of the defect core. The degree of anisotropy ...

[Phys. Rev. B 99, 134105] Published Wed Apr 17, 2019

]]>We study the uniform time-reversal-invariant $U\left(1\right)$ quantum spin liquid (QSL) with low-energy fermionic quasiparticles for rare-earth pyrochlore magnets and explore its magnetic instability, employing an augmented fermionic parton mean field theory approach. Self-consistent calculations stabilize a un...

[Phys. Rev. B 99, 134425] Published Wed Apr 17, 2019

]]>The authors report an experimental demonstration of an opposite anticrossing effect in a photon-magnon coupled system consisting of a YIG and an inverted pattern of split-ring resonator (ISRR) structure in a planar geometry. The dispersion shape of the anticrossing effect is modifiable by changing the position/orientation of the ISRR split gap relative to the microstrip-line axis. This experimental observation, coupled with analytical calculations of various dispersion types of anticrossing, shows the potential and flexibility of photon-magnon systems for exploring emergent phenomena and light-matter interaction applications.

[Phys. Rev. B 99, 134426] Published Wed Apr 17, 2019

]]>Recent experiments on twisted bilayer graphene (tBG) close to magic angle show that a small relative rotation in a van der Waals heterostructure greatly alters its electronic properties. We consider various scattering mechanisms and show that the carrier transport in tBG is dominated by a combinatio...

[Phys. Rev. B 99, 140302(R)] Published Wed Apr 17, 2019

]]>A fully dynamic theoretical approach to layered optomagnonic structures, based on a time Floquet scattering-matrix method, is developed. Its applicability is demonstrated on a simple design of a dual photonic-magnonic cavity, formed by sandwiching a magnetic garnet thin film between two dielectric B...

[Phys. Rev. B 99, 144415] Published Wed Apr 17, 2019

]]>We have studied nonequilibrium phase transitions in the vortex lattice in superconducting ${\mathrm{MgB}}_{2}$, where metastable states are observed in connection with an intrinsically continuous rotation transition. Using small-angle neutron scattering and a stop-motion technique, we investigated the manner in whi...

[Phys. Rev. B 99, 144515] Published Wed Apr 17, 2019

]]>We explore the manifestation of quantum fluctuations across the superconductor-insulator transition (SIT) in three different local measurements: the two-particle density of states $P(\mathbf{r},\omega )$, compressibility $\kappa \left(\mathbf{r}\right)$, and diamagnetic susceptibility $\chi \left(\mathbf{r}\right)$ revealed through their local maps. The map of $\chi \left(\mathbf{r}\right)$ dis...

[Phys. Rev. B 99, 144516] Published Wed Apr 17, 2019

]]>The eigenstate thermalization hypothesis (ETH) is a successful theory that provides sufficient criteria for ergodicity in quantum many-body systems. Most studies were carried out for Hamiltonians relevant for ultracold quantum gases and single-component systems of spins, fermions, or bosons. The par...

[Phys. Rev. B 99, 155130] Published Wed Apr 17, 2019

]]>The hexagonal phase of $\mathrm{AgBiS}{\mathrm{e}}_{2}$ has been discovered as a promising thermoelectric material for room-temperature applications. However, its basic conduction type is still ambiguous, and its current ZT value is pretty low. To improve the thermoelectric performance of $\mathrm{AgBiS}{\mathrm{e}}_{2}$, we apply band engineering ...

[Phys. Rev. B 99, 155203] Published Wed Apr 17, 2019

]]>We propose that the electronic structure of twisted bilayer graphene (TBG) can be understood as Dirac fermions coupled with opposite pseudomagnetic fields generated by the moiré pattern. The two low-energy flat bands from each monolayer valley originate from the two zeroth pseudo Landau levels of Di...

[Phys. Rev. B 99, 155415] Published Wed Apr 17, 2019

]]>The neutrally charged silicon vacancy in diamond is a promising system for quantum technologies that combines high-efficiency optical spin initialization with long spin lifetimes (${T}_{2}\approx 1$ ms at 4 K) and up to 90% of optical emission into its 946-nm zero-phonon line. However, the electronic structure of...

[Phys. Rev. B 99, 161112(R)] Published Wed Apr 17, 2019

]]>We use tunable, vacuum ultraviolet laser based angle-resolved photoemission spectroscopy and density functional theory (DFT) calculations to study the electronic properties of Dirac semimetal candidate cubic ${\mathrm{PtBi}}_{2}$. In addition to bulk electronic states we also find surface states in ${\mathrm{PtBi}}_{2}$, which is ...

[Phys. Rev. B 99, 161113(R)] Published Wed Apr 17, 2019

]]>Since the discovery of superconductivity and correlated insulators at fractional electron fillings in twisted bilayer graphene, most theoretical efforts have been focused on describing this system in terms of an effective extended Hubbard model. However, it was recognized that an exact tight-binding...

[Phys. Rev. B 99, 161405(R)] Published Wed Apr 17, 2019

]]>We show that a quadratic system of *pseudofermions*, with tunable fractionalized statistics, can host a rich phase diagram on a one-dimensional chain with nearest- and next-nearest-neighbor hopping. Using a combination of numerical and analytical techniques, we show that by varying the statistical ang...

[Phys. Rev. B 99, 165125] Published Wed Apr 17, 2019

]]>We study the detection of electrons undergoing coherent transfer via adiabatic passage (CTAP) in a triple quantum-dot system with a quantum point contact sensing the charge of the middle dot. In the ideal scenario, the protocol amounts to perfect change transfer between the external dots with vanish...

[Phys. Rev. B 99, 165422] Published Wed Apr 17, 2019

]]>[Phys. Rev. B 99, 169903] Published Wed Apr 17, 2019

]]>[Phys. Rev. B 99, 169904] Published Wed Apr 17, 2019

]]>[Phys. Rev. B 99, 169905] Published Wed Apr 17, 2019

]]>Fluid-saturated porous metamaterials described following Biot's theory support two longitudinal elastic waves. The phase velocity and attenuation of these waves depend nonlinearly on porosity and viscosity of the fluid. Furthermore, when two fluid-saturated porous metamaterials are arranged to form ...

[Phys. Rev. B 99, 134304] Published Tue Apr 16, 2019

]]>At the many-body localization transition, the dynamics of an isolated quantum system freezes out. In systems with long-range interactions (and possibly short-range systems in many spatial dimensions) this transition does not happen in the conventional thermodynamic limit: arbitrarily weak interactions prevent many-body localization. Here, the authors argue that even in these cases a sharp phase transition exists if one scales down the interaction strength with increasing system size in a specific nonstandard way.

[Phys. Rev. B 99, 134305] Published Tue Apr 16, 2019

]]>Systematic studies of magnetic ordering, magnetic-field-induced transitions, electronic structure, and optical properties of the frustrated spinel ${\mathrm{GeCo}}_{2}{\mathrm{O}}_{4}$ (GCO) are reported. Our results reveal that GCO orders antiferromagnetically (AFM) at ${T}_{\mathrm{N}}=20.4$ K but with significant short-range ferromagnetic (F...

[Phys. Rev. B 99, 134422] Published Tue Apr 16, 2019

]]>The magnetic and electronic nature of the $\gamma \text{\u2212}{\mathrm{Al}}_{2}{\mathrm{O}}_{3}/{\mathrm{SrTiO}}_{3}$ spinel/perovskite interface is explored by means of x-ray absorption spectroscopy. Polarized x-ray techniques combined with atomic multiplet calculations reveal localized magnetic moments assigned to ${\mathrm{Ti}}^{3+}$ at the interface with equivalent size ...

[Phys. Rev. B 99, 134423] Published Tue Apr 16, 2019

]]>We theoretically investigate the interlayer dipolar and exchange couplings between an array of metallic magnetic nanowires grown on top of an extended ultrathin yttrium iron garnet film. The calculated interlayer dipolar coupling agrees with observed anticrossings [Chen *et al.*, Phys. Rev. Lett. **120**,...

[Phys. Rev. B 99, 134424] Published Tue Apr 16, 2019

]]>We have studied the merging of two identical ${}^{4}\mathrm{He}$ droplets at zero temperature, caused by their van der Waals mutual attraction. During the early stages of the merging, density structures appear which closely match the experimental observations by Vicente *et al.* [J. Low Temp. Phys. **121**, 627 (2000)]. ...

[Phys. Rev. B 99, 140505(R)] Published Tue Apr 16, 2019

]]>Ferromagnetic topological insulators have emerged as a promising platform for quantum anomalous Hall (QAH) effect with a dissipationless edge transport. However, the observation of QAH effect has so far been restricted to extremely low temperatures. We investigate the microscopic origin of ferromagn...

[Phys. Rev. B 99, 144413] Published Tue Apr 16, 2019

]]>We investigate the ground-state phase diagram of the frustrated transverse-field Ising (TFI) model on the checkerboard lattice (CL), which consists of Néel, collinear, quantum paramagnet, and plaquette-valence bond solid (-VBS) phases. We implement a numerical simulation that is based on the recentl...

[Phys. Rev. B 99, 144414] Published Tue Apr 16, 2019

]]>When superconducting (SC) and charge-density-wave (CDW) orders compete, novel low-temperature behaviors can result. From an analysis of the Landau-Ginzburg-Wilson theory of competing orders, we demonstrate the generic occurrence of a “fragile” SC phase at low temperatures and high fields in the pres...

[Phys. Rev. B 99, 144513] Published Tue Apr 16, 2019

]]>Low-temperature scanning tunneling microscopy and spectroscopy has been used to image the vortex core and the vortex lattice in FeSe single crystals. The local tunneling spectra acquired at the center of elliptical vortex cores display a strong particle-hole asymmetry with spatial oscillation, chara...

[Phys. Rev. B 99, 144514] Published Tue Apr 16, 2019

]]>We report strong electron-electron interactions in quantum wires etched from an InAs quantum well, a material generally expected to have strong spin-orbit interactions. We find that the current through the wires as a function of the bias voltage and temperature follows the universal scaling behavior...

[Phys. Rev. B 99, 155304] Published Tue Apr 16, 2019

]]>Spin-noise spectroscopy has developed into a very powerful tool to access the electron spin dynamics. While the spin-noise power spectrum in an ensemble of quantum dots in a magnetic field is essentially understood, we argue that the investigation of the higher-order cumulants promises to provide ad...

[Phys. Rev. B 99, 155305] Published Tue Apr 16, 2019

]]>Linearly polarized microphotoluminescence ($\mu $-PL) measurements of strained ${\mathrm{WSe}}_{2}$ monolayers in out-of-plane high magnetic fields are presented. At low temperature, a splitting of the bright exciton emission into two exciton components is observed, which is attributed to an in-plane uniaxial strain bas...

[Phys. Rev. B 99, 155414] Published Tue Apr 16, 2019

]]>${\mathrm{PdSb}}_{2}$ is a candidate for hosting sixfold-degenerate exotic fermions (beyond Dirac and Weyl fermions). The nontrivial band crossing protected by the nonsymmorphic symmetry plays a crucial role in physical properties. We have grown high-quality single crystals of ${\mathrm{PdSb}}_{2}$ and characterized their physical...

[Phys. Rev. B 99, 161110(R)] Published Tue Apr 16, 2019

]]>We report large enhancement of upper critical field ${H}_{\mathrm{c}2}$ observed in superconducting ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ thin films. Through dimensional crossover approaching two dimensions, ${H}_{\mathrm{c}2}$ except the in-plane field direction is dramatically enhanced compared to bulks, following a definite relation distinct from bulk one b...

[Phys. Rev. B 99, 161111(R)] Published Tue Apr 16, 2019

]]>We study the polarization dependence of optical absorption for a modified Haldane model, which exhibits antichiral edge modes in the presence of sample boundaries and has been argued to be realizable in transition metal dichalcogenides or Weyl semimetals. A rich optical phase diagram is unveiled, in...

[Phys. Rev. B 99, 161404(R)] Published Tue Apr 16, 2019

]]>We develop and benchmark a technique for simulating excitation spectra of generic two-dimensional quantum lattice systems using the framework of projected entangled-pair states (PEPS). The technique relies on a variational ansatz for capturing quasiparticle excitations on top of a PEPS ground state....

[Phys. Rev. B 99, 165121] Published Tue Apr 16, 2019

]]>Herein we report the formation energies of native point defects in $1T\text{\u2212}{\mathrm{TiS}}_{2}$ material. In the present study we used one of the most refined models, e.g., a global hybrid density functional with dispersion corrections for all the calculations. The stability domain of $1T\text{\u2212}{\mathrm{TiS}}_{2}$ was thoroughly investigated...

[Phys. Rev. B 99, 165122] Published Tue Apr 16, 2019

]]>Identifying variational wave functions that efficiently parametrize the physically relevant states in the exponentially large Hilbert space is one of the key tasks towards solving the quantum many-body problem. Powerful tools in this context such as tensor network states have recently been complemen...

[Phys. Rev. B 99, 165123] Published Tue Apr 16, 2019

]]>The rare-earth nickelates ($R$NiO${}_{3}$) have been subject to intense investigation, mostly because of their rich phase diagrams, comprising a sharp temperature-driven metal-to-insulator transition and an unusual antiferromagnetic ground state. Here, the authors use high-resolution resonant inelastic x-ray scattering (RIXS) at the Ni ${L}_{3}$ edge to study simultaneously the bond and magnetic orders controlled via heterostructuring. The results show that RIXS gives valuable insights into the interplay of different collective ordering phenomena in a prototypical 3$d$ transition-metal oxide

[Phys. Rev. B 99, 165124] Published Tue Apr 16, 2019

]]>Using time- and angle-resolved photoemission spectroscopy, we study the response of metallic single-layer ${\mathrm{TaS}}_{2}$ in the 1H structural modification to the generation of excited carriers by a femtosecond laser pulse. A complex interplay of band structure modifications and electronic temperature increase...

[Phys. Rev. B 99, 165421] Published Tue Apr 16, 2019

]]>Compounds with a tetragonal ${\mathrm{ThCr}}_{2}{\mathrm{Si}}_{2}$-type structure are characterized by the possibility of the isostructural phase transition from the tetragonal phase to the collapsed tetragonal phase induced by the external pressure. An example of a compound with such a phase transition is ${\mathrm{KFe}}_{2}{\mathrm{As}}_{2}$, which belongs...

[Phys. Rev. B 99, 134103] Published Mon Apr 15, 2019

]]>We carry out molecular-dynamics simulation of shear-induced martensitic phase transitions between the orthorhombic and nonorthorhombic (triclinic and monoclinic) phases of crystalline polyethylene (PE) in the framework of a realistic all atom model of the polymer. We show that the variation of the s...

[Phys. Rev. B 99, 134104] Published Mon Apr 15, 2019

]]>Using the Feynman diagram techniques, we theoretically obtain the quantum conductivity correction for a two-dimensional pseudospin-1 electron system in the presence of long-range diagonal disorder. Theoretical results clearly reveal that the quantum correction depends on the sublattice correlation p...

[Phys. Rev. B 99, 134204] Published Mon Apr 15, 2019

]]>Using the density-matrix renormalization group technique, we study a one-dimensional spin-$\frac{1}{2}$ Heisenberg chain consisting of coupled tetramers as an effective spin model for the copper vanadate ${\mathrm{CuInVO}}_{5}$. We obtain the ground-state phase diagram as a function of intratetramer and intertetramer exchange...

[Phys. Rev. B 99, 134420] Published Mon Apr 15, 2019

]]>We studied the spin torque efficiency and the Dzyaloshinskii-Moriya interaction (DMI) of heterostructures that contain interface(s) of Ir and Co. The current-induced shifts of the anomalous Hall loops were used to determine the spin torque efficiency and DMI of $[\text{Pt}/\text{Co}/X]$ multilayers $(X=\mathrm{Ir},\text{Cu})$ as wel...

[Phys. Rev. B 99, 134421] Published Mon Apr 15, 2019

]]>Phonon measurements in the $A15$-type superconductors were complicated in the past because of the unavailability of large single crystals for inelastic neutron scattering, e.g., in the case of ${\mathrm{Nb}}_{3}\mathrm{Sn}$, or unfavorable neutron scattering properties in the case of ${\mathrm{V}}_{3}\mathrm{Si}$. Hence, only few studies of the latti...

[Phys. Rev. B 99, 134511] Published Mon Apr 15, 2019

]]>The electronic structure of the giant vortex states in a mesoscopic superconducting disk is studied in a dirty limit using the Usadel approach. The local density of states profiles are shown to be strongly affected by the effect of quasiparticle (QP) tunneling between the states localized in the vor...

[Phys. Rev. B 99, 134512] Published Mon Apr 15, 2019

]]>Recent development in exact classification of a superconducting gap has elucidated various unconventional gap structures, which have not been predicted by the classification of order parameter based on the point group. One of the important previous results is that all symmetry-protected line nodes a...

[Phys. Rev. B 99, 134513] Published Mon Apr 15, 2019

]]>Magnetic skyrmions in bulk crystals are linelike topologically protected spin textures. They allow for the propagation of magnons along the skyrmion line but are localized inside the skyrmion line. Analogous to the vortex line, these propagating modes are the Kelvin modes of a skyrmion line. In crys...

[Phys. Rev. B 99, 140408(R)] Published Mon Apr 15, 2019

]]>The nature and mechanism of superconductivity in the extremely electron-doped FeSe-based superconductors remains an outstanding problem. In these systems, the hole-like band has moved below the Fermi energy, and various spin-fluctuation theories involving pairing between states near the electron Fer...

[Phys. Rev. B 99, 140504(R)] Published Mon Apr 15, 2019

]]>Ultrafast dynamics are generally investigated using stroboscopic pump-probe measurements, which characterize the sample properties for a single, specific time delay. These measurements are then repeated for a series of discrete time delays to reconstruct the overall time trace of the process. As a c...

[Phys. Rev. B 99, 144305] Published Mon Apr 15, 2019

]]>We utilize near-infrared femtosecond pulses to investigate coherent phonon oscillations of ${\mathrm{Ca}}_{2}{\mathrm{RuO}}_{4}$. The coherent ${A}_{g}$ phonon mode of the lowest frequency changes abruptly not only its amplitude but also the oscillation phase as the spin order develops. In addition, the phonon mode shows a redshift ent...

[Phys. Rev. B 99, 144306] Published Mon Apr 15, 2019

]]>We theoretically investigate spin transport at the interface between a ferromagnetic insulator (FI) and a superconductor (SC). Considering a simple FI-SC interface model, we derive formulas for the spin current and spin-current noise induced by microwave irradiation (spin pumping) or the temperature...

[Phys. Rev. B 99, 144411] Published Mon Apr 15, 2019

]]>We report a ferroelectric order at $\sim 98$ K for ${\mathrm{NiFe}}_{2}{\mathrm{O}}_{4}$, which carries an inverse spinel structure with a centrosymmetric $Fd\overline{3}m$ structure at room temperature. The value of spontaneous electric polarization is considerably high as $\sim 0.29\mu \mathrm{C}/{\mathrm{cm}}^{2}$ for 5 kV/cm poling field. The electric polarization decrease...

[Phys. Rev. B 99, 144412] Published Mon Apr 15, 2019

]]>We discuss the type of pairing in the hexagonal pnictide superconductor SrPtAs, taking into account its multiband structure. The topological chiral $d$-wave state with time-reversal symmetry breaking has been anticipated from the spontaneous magnetization observed by the muon-spin-relaxation experimen...

[Phys. Rev. B 99, 144510] Published Mon Apr 15, 2019

]]>We report the ac magnetic susceptibility, electrical resistance, and x-ray diffraction measurements of ${\mathrm{PtH}}_{x}\phantom{\rule{4pt}{0ex}}\left(x\simeq 1\right)$ in diamond anvil cells, that reveal the superconducting transition. At 30 GPa, when ${\mathrm{PtH}}_{x}$ is in a ${P6}_{3}/mmc$ structure, ${\mathrm{PtH}}_{x}$ exhibits the superconducting transition at 7 K. Remarkably, the ob...

[Phys. Rev. B 99, 144511] Published Mon Apr 15, 2019

]]>Near a quantum-critical point in a metal a strong fermion-fermion interaction, mediated by a soft boson, destroys fermionic coherence and also gives rise to an attraction in one or more pairing channels. The two tendencies compete with each other, and in a class of large $N$ models, where the tendency...

[Phys. Rev. B 99, 144512] Published Mon Apr 15, 2019

]]>The fracton states of matter have been argued to mimic gravity. Here, the authors study a simple fracton toy model in anti-de Sitter space and show that it satisfies several important properties of holography. These properties include the correct boundary-bulk subregion duality: that the boundary mutual information (as the classical analog of entanglement entropy) obeys the well-known Ryu-Takayanagi formula, and that a naive black hole has the correct entropy. This work implies a deeper connection between fracton phases and gravity.

[Phys. Rev. B 99, 155126] Published Mon Apr 15, 2019

]]>We investigate the ionic Hubbard model (IHM) at half-filling in the limit of strong correlations and large ionic potential. The low-energy effective Hamiltonian in this limit, obtained by a similarity transformation, is a modified $t-J$ model with effective second-neighbor hopping terms. We explore th...

[Phys. Rev. B 99, 155127] Published Mon Apr 15, 2019

]]>We propose a type of topological states of matter exhibiting topologically nontrivial edge states (ESs) within gapless bulk states (GBSs) protected by both spin rotational and reflection symmetries. A model presenting such states is simply comprised of a one-dimensional reflection symmetric superlat...

[Phys. Rev. B 99, 155128] Published Mon Apr 15, 2019

]]>We discuss the relations between restricted Boltzmann machine (RBM) states and the matrix product states (MPS) for the ground states of 1D translational invariant stabilizer codes. A generic translational invariant and finitely connected RBM state can be expressed as an MPS, and the matrices of the ...

[Phys. Rev. B 99, 155129] Published Mon Apr 15, 2019

]]>Molecular dynamics (MD) simulation has emerged as a powerful predictive tool to study mechanical and thermal properties of materials, without the requirement for any fitting parameter inputs such as phonon relaxation time. However, the lack of suitable interatomic potentials for many complex materia...

[Phys. Rev. B 99, 155202] Published Mon Apr 15, 2019

]]>We study the time-dependent dynamical phase of fractional quasiparticles in quantum Hall states using Ramsey interferometry. A Ramsey two-pulse voltage modulation generates an interference term in the current noise of a quantum point contact oscillating with the dynamical phase. We show that the int...

[Phys. Rev. B 99, 161109(R)] Published Mon Apr 15, 2019

]]>We propose a lattice density-functional theory for *ab initio* quantum chemistry or physics as a route to an efficient approach that approximates the full configuration interaction energy and orbital occupations for molecules with strongly correlated electrons. We build on lattice density-functional t...

[Phys. Rev. B 99, 165118] Published Mon Apr 15, 2019

]]>We propose a simple strategy to find possible linear double Weyl semimetals (WSMs) among nonmagnetic materials. This strategy can reproduce several known robust WSM candidates, covering orthorhombic, tetragonal, and cubic lattice systems. This kind of WSM hosts Weyl points (WPs) carrying double chir...

[Phys. Rev. B 99, 165119] Published Mon Apr 15, 2019

]]>We develop a generalization of the Kohn-Sham density-functional theory (KS-DFT)+Hubbard $U$ ($\mathrm{DFT}+U$) method to the excited-state regime. This has the form of Hubbard $U$ corrected linear-response time-dependent DFT, or “$\mathrm{TDDFT}+U$.” Combined with calculated linear-response Hubbard $U$ parameters, it may provi...

[Phys. Rev. B 99, 165120] Published Mon Apr 15, 2019

]]>We study the coupling between a singlet-triplet qubit realized in a double quantum dot to a topological qubit realized by spatially well-separated Majorana bound states. We demonstrate that the singlet-triplet qubit can be leveraged for readout of the topological qubit and for supplementing the gate...

[Phys. Rev. B 99, 165306] Published Mon Apr 15, 2019

]]>Dynamically tunable light-matter interfaces are important for the success of emerging quantum technologies. Quantum dots embedded in photonic crystal membranes provide an attractive platform as the cavities have high quality factors, low mode volumes, and can be doped to provide limited voltage tuning of the exciton states. Here, the authors demonstrate that the versatility and applications of this architecture can be extended by replacing the quantum dot with a quantum dot molecule. Two tunnel-coupled quantum dots permit molecular exciton states that have voltage-tunable energies and dipole moments. Advantage is taken of the tunable dipole moments of mixed exciton states to demonstrate $i\phantom{\rule{0}{0ex}}n$ $s\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}u$ tuning of the vacuum Rabi splitting as well as new polariton states with hybrid spin character.

[Phys. Rev. B 99, 165420] Published Mon Apr 15, 2019

]]>The topological Hall effect (THE) is one of the key signatures of topologically nontrivial magnetic spin textures, wherein electrons feel an additional transverse voltage to the applied current. The magnitude of THE is often small compared to the anomalous Hall effect. Here, we find a large THE of $\mathrm{0...}$

[Phys. Rev. B 99, 140406(R)] Published Fri Apr 12, 2019

]]>Based on theoretical arguments, the authors provide a clear pathway to utilizing a new chiral particle – a chiral bobber – for the purposes of future spintronics. They discover that these novel chiral states possess inherent transport traits that allow for their unambiguous electrical detection in systems comprising several types of chiral states. The unique properties of bobbers are rooted in the nontrivial spin topology of these particles, which also bear great potential for cognitive computing.

[Phys. Rev. B 99, 140407(R)] Published Fri Apr 12, 2019

]]>We have used spin-polarized neutron reflectometry to investigate the magnetization profile of superlattices composed of ferromagnetic Gd and superconducting Nb layers. We have observed a partial suppression of ferromagnetic (F) order of Gd layers in [$\mathrm{Gd}\left({d}_{F}\right)/\mathrm{Nb}(25\mathrm{nm}){\mathrm{]}}_{12}$ superlattices below the super...

[Phys. Rev. B 99, 140503(R)] Published Fri Apr 12, 2019

]]>The fast-inertial-relaxation engine (FIRE) has proven to efficiently find local minima of potential energies or related penalty functions although its implementation requires only few, additional lines of code in a molecular-dynamics or steepest-descent program. So far, FIRE has been predominantly a...

[Phys. Rev. B 99, 144103] Published Fri Apr 12, 2019

]]>Recent experimental findings in the bulk cubic helimagnet and Mott insulator ${\mathrm{Cu}}_{2}{\mathrm{OSeO}}_{3}$ highlight the paramount role of cubic anisotropy in stabilizing novel chiral and skyrmion phases. It was indeed found that if a magnetic field is applied along the easy $\langle 001\rangle $ crystallographic direction, competing c...

[Phys. Rev. B 99, 144410] Published Fri Apr 12, 2019

]]>The electron states of gapped pseudospin-1 fermions of the $\alpha -{\mathcal{T}}_{3}$ lattice in the Coulomb field of a charged impurity are studied. The free $\alpha -{\mathcal{T}}_{3}$ model has three dispersive bands with two energy gaps between them depending on the parameter $\mathrm{\Theta}$ which controls the coupling of atoms of a honeycomb lattice wi...

[Phys. Rev. B 99, 155124] Published Fri Apr 12, 2019

]]>$\mathrm{MnB}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{4}$ was recently suggested as the first example of an antiferromagnetic topological insulator. However, lacking good quality of single crystals hindered its further investigation. Here, we report the detailed transport properties of several $\mathrm{MnB}{\mathrm{i}}_{2}\mathrm{T}{\mathrm{e}}_{4}$ thin flakes in which samples are more homogen...

[Phys. Rev. B 99, 155125] Published Fri Apr 12, 2019

]]>Using a Green's function approach, we study phonon-mediated superconducting pairing symmetries that may arise in bilayer graphene where the monolayers are displaced in-plane with respect to each other. We consider a generic coupling potential between the displaced graphene monolayers, which is appli...

[Phys. Rev. B 99, 155413] Published Fri Apr 12, 2019

]]>The intrinsic brittleness of inorganic semiconductors prevents them from extended engineering applications under extreme conditions of high temperature and pressure, making it essential to improve their ductility. Here, we applied the constrained density functional theory to examine the relationship...

[Phys. Rev. B 99, 161202(R)] Published Fri Apr 12, 2019

]]>We apply the nonequilibrium functional renormalization group approach treating flow of the electronic self-energies, to describe local magnetic moment formation and electronic transport in a quadruple quantum dot (QQD) ring, coupled to leads, with moderate Coulomb interaction on the quantum dots. We...

[Phys. Rev. B 99, 165114] Published Fri Apr 12, 2019

]]>This paper explores the energy scales of the doped Anderson lattice model using dynamical mean-field theory (DMFT), using a continuous-time quantum Monte Carlo (CTQMC) impurity solver. We show that the low temperature properties of the lattice cannot be scaled using the single ion local Kondo temper...

[Phys. Rev. B 99, 165115] Published Fri Apr 12, 2019

]]>The three-band Hubbard model is a fundamental model for understanding properties of the copper-oxygen planes in cuprate superconductors. We use cutting-edge auxiliary-field quantum Monte Carlo (AFQMC) methods to investigate ground state properties of the model in the parent compound. Large supercell...

[Phys. Rev. B 99, 165116] Published Fri Apr 12, 2019

]]>A large Berry curvature in the vicinity of the Fermi energy is required in order to obtain a large anomalous Hall and Nernst effect. This Berry curvature can be induced by Weyl points and gapped nodal lines. One of the possible mechanisms takes place in systems with a symmetry group where mirror pla...

[Phys. Rev. B 99, 165117] Published Fri Apr 12, 2019

]]>[Phys. Rev. B 99, 169902] Published Fri Apr 12, 2019

]]>The structure and dynamical properties of the ${\mathrm{Fe}}_{3}\mathrm{Si}/\mathrm{GaAs}\left(001\right)$ interface are investigated by density functional theory and nuclear inelastic scattering measurements. The stability of four different atomic configurations of the ${\mathrm{Fe}}_{3}\mathrm{Si}/\mathrm{GaAs}$ multilayers is analyzed by calculating the formation energies a...

[Phys. Rev. B 99, 134303] Published Thu Apr 11, 2019

]]>The ${\mathrm{CoBr}}_{2}$ monolayer is predicted to be an intrinsically ferromagnetic (FM) semiconductor based on the first-principles calculations. The results of the magnetic anisotropy energy show that the ${\mathrm{CoBr}}_{2}$ monolayer has an easy magnetization plane and belongs to the family of two-dimensional $XY$ magnets. Th...

[Phys. Rev. B 99, 134416] Published Thu Apr 11, 2019

]]>Kitaev materials, based on bond-directional Ising interactions, offer an intriguing platform for hosting exotic magnetic ground states and excitations. Significant Kitaev interactions are most commonly realized in heavy transition metal magnets with so-called ${J}_{\mathrm{eff}}$ = ½ electronic ground states for the transition metal and local geometries consisting of metal-ligand edge-sharing octahedra. Here, the authors show that Kitaev materials can also be realized in ${J}_{\mathrm{eff}}$ = ½ magnets via extended superexchange pathways mediated by more than one anion.

[Phys. Rev. B 99, 134417] Published Thu Apr 11, 2019

]]>In orthorhombic ${\mathrm{LuMnO}}_{3}$ perovskite with nonmagnetic ${\mathrm{Lu}}^{+3}$ ions ($4{f}^{14}5{d}^{0}6{s}^{0}$) there exists one magnetic transition of ${\mathrm{Mn}}^{+3}$ ions at ${T}_{N}\approx 35.5$ K. In ${\mathrm{YbMnO}}_{3}$ perovskite with ${\mathrm{Yb}}^{+3}$ ions of one electron less ($4{f}^{13}5{d}^{0}6{s}^{0}$), two magnetic transitions are observed at ${T}_{N}\approx 43$ K and $T\approx 3$–4 K, respectively. While the trans...

[Phys. Rev. B 99, 134418] Published Thu Apr 11, 2019

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