In dynamical and acoustical systems, breaking reciprocity is achievable by employing external biases, spatial temporal variations of material properties, or nonlinearities. In this present work, we propose, theoretically analyze, and experimentally demonstrate the first passive broad-band mechanical...

[Phys. Rev. B 99, 214305] Published Thu Jun 20, 2019

]]>Polar lacunar spinels, such as $\mathrm{Ga}{\mathrm{V}}_{4}{\mathrm{S}}_{8}$ and $\mathrm{Ga}{\mathrm{V}}_{4}\mathrm{S}{\mathrm{e}}_{8}$, were proposed to host skyrmion phases under magnetic field. In this work, we put forward, as a candidate for Néel-type skyrmion lattice, the isostructural $\mathrm{GaM}{\mathrm{o}}_{4}{\mathrm{S}}_{8}$, which is systematically studied via both first-principles calculations and Monte Carl...

[Phys. Rev. B 99, 214427] Published Thu Jun 20, 2019

]]>Recent research discovered that charge-transfer processes in chiral molecules can be spin-selective, and the effect was named chiral-induced spin selectivity (CISS). Follow-up work studied hybrid spintronic devices with conventional electronic materials and chiral (bio)molecules. However, a theoreti...

[Phys. Rev. B 99, 214428] Published Thu Jun 20, 2019

]]>Nonreciprocity of spin-wave propagation is a well-known consequence of antisymmetric exchange contributions in magnetic spin systems that lack inversion symmetry. In this case, the energy of a state depends on the sign of its momentum as $\u0127\omega \left(k\right)\ne \u0127\omega \left(-k\right)$. We discuss here the consequences of this nonreci...

[Phys. Rev. B 99, 214429] Published Thu Jun 20, 2019

]]>At a continuous phase transition, different systems can show the same behavior and are said to belong to the same universality class. Combining synchrotron x-ray scattering and numerical simulations, we establish that artificial square ice, a magnetic metamaterial consisting of a two-dimensional array of nanomagnets, admits of such a transition. The authors show that the transition belongs to the two-dimensional Ising universality class, extending the applicability of the fundamental concepts of continuous phase transitions to mesoscopic magnetic systems.

[Phys. Rev. B 99, 214430] Published Thu Jun 20, 2019

]]>We have combined high sensitivity, extra-low differential temperature scanning rate calorimetry, and acoustic emission (AE) measurements to study avalanches during the cubic ↔ 18R martensitic transition of a Cu-Al-Be single crystalline shape memory alloy. Both AE and calorimetry corroborate a good p...

[Phys. Rev. B 99, 224101] Published Thu Jun 20, 2019

]]>Single-crystal elastic moduli ${C}_{ij}$, shear modulus $G$, and Zener anisotropic ratio $A$ of solid argon having the face-centered cubic (fcc) structure were determined at high pressures between 12 and 64 GPa using a combination of experimental and theoretical approaches. The experimental data, namely, the m...

[Phys. Rev. B 99, 224102] Published Thu Jun 20, 2019

]]>We introduce microscopic polarization and magnetization fields at each site of an extended system, as well as free charge and current density fields associated with charge movement from site to site, by employing a lattice gauge approach based on a set of orthogonal orbitals associated with each sit...

[Phys. Rev. B 99, 235140] Published Thu Jun 20, 2019

]]>Trial wave functions such as the Moore-Read and Read-Rezayi states, which minimize short-range multibody interactions, are candidate states for describing the fractional quantum Hall effects at filling factors $\nu =1/2$ and $2/5$ in the second Landau level. These trial wave functions are unique zero-energ...

[Phys. Rev. B 99, 235141] Published Thu Jun 20, 2019

]]>In the study of strongly correlated, many-electron systems, the Hubbard-Kanamori (HK) model has emerged as one of the prototypes for transition metal oxide physics. The model is multiband in nature and contains Hund's coupling terms, which have pronounced effects on metal-insulator transitions, high...

[Phys. Rev. B 99, 235142] Published Thu Jun 20, 2019

]]>The authors show here that electronic conduction in moderately to highly doped nickel oxide (NiO) occurs via interacceptor hopping of heavy, self-trapped charge carriers (polarons). These carriers remain localized around acceptors, and are transported by moving exclusively among those sites. This is in contrast to previous assumptions, namely that all NiO lattice sites take part in the electronic transport process (‘free’ small polaron hopping). Furthermore, disorder is demonstrated to play a vital role in the transport characteristics.

[Phys. Rev. B 99, 235201] Published Thu Jun 20, 2019

]]>We study the heat conductance of hybrid superconducting junctions. Our analysis involves single-channel junctions with arbitrary transmission as well as diffusive connectors and shows the influence of the superconducting gaps and phases of the contacts on the heat conductance. If the junction is *dif...*

[Phys. Rev. B 99, 235422] Published Thu Jun 20, 2019

]]>The recent development in topological photonics has revealed a variety of exotic phenomena such as Weyl degeneracy. However, a Weyl nodal surface, a two-dimensional topological degeneracy, has not been reported in Hermitian photonics. In this paper, topologically nontrivial photonic nodal surface in...

[Phys. Rev. B 99, 235423] Published Thu Jun 20, 2019

]]>Recently, there has been a lot of activity in the research field of topological non-Hermitian physics, driven by both fundamental interest and potential applications. Here, the authors systematically investigate and classify Dirac-type systems with non-Hermitian perturbations. They find that there are three different types of non-Hermitian terms. For each case, they determine the bulk exceptional points, the boundary modes, and the band topology. These findings serve as guiding principles for the design of applications, for example, in photonic lattices.

[Phys. Rev. B 99, 241110(R)] Published Thu Jun 20, 2019

]]>In time-resolved photoemission experiments, more than one electron can be emitted from the solid by a single ultrashort pulse. We theoretically demonstrate how correlations between the momenta of outgoing electrons relate to time-dependent two-particle correlations in the solid. This can extend the ...

[Phys. Rev. B 99, 241111(R)] Published Thu Jun 20, 2019

]]>We investigate the light-matter interaction between the edge state of a 2D topological insulator and quantum electromagnetic field. The interaction originates from the Zeeman term between the spin of the edge electrons and the magnetic field, and also through the Peierls substitution. The continuous...

[Phys. Rev. B 99, 245137] Published Thu Jun 20, 2019

]]>We construct a family of two-dimensional non-Abelian topological phases from coupled wires using a non-Abelian bosonization approach. We then demonstrate how to determine the nature of the non-Abelian topological order (in particular, the anyonic excitations and the topological degeneracy on the tor...

[Phys. Rev. B 99, 245138] Published Thu Jun 20, 2019

]]>We show the significant impact of weak disorder on the Mott transition by investigating electronic transport in a systematically x-ray-irradiated layered organic conductor under continuous pressure control. The critical end point of the first-order Mott transition is dramatically suppressed by such ...

[Phys. Rev. B 99, 245139] Published Thu Jun 20, 2019

]]>[Phys. Rev. B 99, 249904] Published Thu Jun 20, 2019

]]>The generalized pseudopotential theory (GPT) is a powerful method for deriving real-space transferable interatomic potentials. Using a coarse-grained electronic structure, one can explicitly calculate the pair ion-ion and multi-ion interactions in simple and transition metals. While successful in de...

[Phys. Rev. B 99, 214107] Published Wed Jun 19, 2019

]]>We investigate phase-coherent thermal transport in Josephson junctions made from unconventional superconductors or superfluids. The thermal conductance is evaluated for one- and two-dimensional junctions within the Bogoliubov–de Gennes formalism. We analyze three different scenarios of junctions bet...

[Phys. Rev. B 99, 214508] Published Wed Jun 19, 2019

]]>The anharmonic lattice dynamics of MgO has been studied at ambient conditions and at high temperatures by infrared spectroscopy and inelastic x-ray scattering measurements combined with density functional perturbation theory calculations. The agreement between the measured phonon energies and widths...

[Phys. Rev. B 99, 220304(R)] Published Wed Jun 19, 2019

]]>We present the full phase diagram of the dumbbell model of spin ice as a function of temperature, chemical potential and staggered chemical potential which breaks the point group symmetry of the underlying diamond lattice in favor of a magnetic charge crystal. We observe a double winged structure wi...

[Phys. Rev. B 99, 224425] Published Wed Jun 19, 2019

]]>Disorder is generically anticipated to suppress long range charge density wave (CDW) order. We report transport, thermodynamic, and scattering experiments on ${\mathrm{Pd}}_{x}{\mathrm{ErTe}}_{3}$, a model CDW system with disorder induced by intercalation. The pristine parent compound ($x=0$) shows two separate, mutually perpendic...

[Phys. Rev. B 99, 235138] Published Wed Jun 19, 2019

]]>A new method enables $a\phantom{\rule{0}{0ex}}b\phantom{\rule{0.333em}{0ex}}i\phantom{\rule{0}{0ex}}n\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}t\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o$ calculations of large and small polarons on the same footing. The authors develop the theory and computational methodology required to determine the ground-state energy and wave functions of electron and hole polarons in semiconductors and insulators, without performing explicit supercell calculations. As initial applications, the authors investigate polarons in LiF and Li${}_{2}$O${}_{2}$.

[Phys. Rev. B 99, 235139] Published Wed Jun 19, 2019

]]>We propose a quantum nondemolition Majorana qubit readout protocol based on parametric modulation of a longitudinal interaction between a pair of Majorana bound states and a resonator. The interaction can be modulated through microwave-frequency gate voltage or flux control of a tunable tunnel barri...

[Phys. Rev. B 99, 235420] Published Wed Jun 19, 2019

]]>An explanation is proposed for the recently observed in optical spectra of monolayer graphene giant increase in the Drude-peak width under applied uniaxial strain. We argue that the underlying mechanism of this increase can be based on resonant scattering of carriers from inevitably present impuriti...

[Phys. Rev. B 99, 235421] Published Wed Jun 19, 2019

]]>The Read-Rezayi (RR) parafermion states form a series of exotic non-Abelian fractional quantum Hall (FQH) states at filling $\nu =k/(k+2)$. Computationally, the wave functions of these states are prohibitively expensive to generate for large systems. We introduce a series of parton states, denoted ${\overline{2}}^{k}{1}^{k+\mathrm{...}}$

[Phys. Rev. B 99, 241108(R)] Published Wed Jun 19, 2019

]]>A stripe-type magnetic structure and related orbital ordering are universally observed in iron-based superconductors. As an exception, the quasi-one-dimensional ladder material ${\mathrm{BaFe}}_{2}{\mathrm{Se}}_{3}$, which shows pressure-induced superconductivity, exhibits a block-type antiferromagnetic ordering. The research of...

[Phys. Rev. B 99, 241109(R)] Published Wed Jun 19, 2019

]]>We studied the effect of external pressure on the optical response of the nodal-line semimetal candidate ZrSiTe by reflectivity measurements. At pressures of a few GPa, the reflectivity, optical conductivity, and loss function are strongly affected in the whole measured frequency range ($200\u201316\phantom{\rule{0.16em}{0ex}}500\phantom{\rule{4pt}{0ex}}{\mathrm{cm}}^{-\mathrm{...}}$

[Phys. Rev. B 99, 245133] Published Wed Jun 19, 2019

]]>We propose and analyze a mechanism for rectification of spin transport through a small junction between two spin baths or leads. For interacting baths, we show that transport is conditioned on the spacial asymmetry of the quantum junction mediating the transport, and attribute this behavior to a gap...

[Phys. Rev. B 99, 245134] Published Wed Jun 19, 2019

]]>We investigate two-dimensional compactifications of three-dimensional fractonic stabilizer models. We find the two-dimensional topological phases produced as a function of compactification radius for the $X$-cube model and Haah's cubic code. Furthermore, we uncover translation symmetry enrichment in t...

[Phys. Rev. B 99, 245135] Published Wed Jun 19, 2019

]]>The competition between the Ruderman-Kittel-Kasuya-Yosida effect and Kondo effect is a central subject of the periodic Anderson model. By using the density matrix embedding theory, we study a three-orbital periodic Anderson model, in which the effects of degenerate conduction orbitals, via the local...

[Phys. Rev. B 99, 245136] Published Wed Jun 19, 2019

]]>We study the topological phase diagram of a setup composed of two nanowires with strong Rashba spin-orbit interaction subjected to an external magnetic field and brought into the proximity to a bulk $s$-wave superconductor in the presence of a supercurrent flowing through it. The supercurrent reduces ...

[Phys. Rev. B 99, 245416] Published Wed Jun 19, 2019

]]>[Phys. Rev. B 99, 249903] Published Wed Jun 19, 2019

]]>The origin of the spin glass (SG) phase in the well-known multiferroic $\mathrm{Pb}\left(\mathrm{F}{\mathrm{e}}_{1/2}\mathrm{N}{\mathrm{b}}_{1/2}\right){\mathrm{O}}_{3}$ compound remains controversial due to the complications introduced by the coexistence of SG and long-range ordered (LRO) antiferromagnetic (AFM) phases. We have addressed this controversy through a comprehensive ...

[Phys. Rev. B 99, 214425] Published Tue Jun 18, 2019

]]>We compare three distinct computational approaches based on first-principles calculations within density functional theory to explore the magnetic exchange and the Dzyaloshinskii-Moriya interactions (DMI) of a Co monolayer on Pt(111), namely, (i) the method of infinitesimal rotations of magnetic mom...

[Phys. Rev. B 99, 214426] Published Tue Jun 18, 2019

]]>There has been a revival of interest in localization phenomena in quasiperiodic systems with a view to examining how they differ fundamentally from such phenomena in random systems. Motivated by this, we study transport in the quasiperiodic, one-dimensional Aubry-Andre model and its generalizations ...

[Phys. Rev. B 99, 224204] Published Tue Jun 18, 2019

]]>Recently, light-induced excitation of Higgs modes, i.e., oscillations of the order-parameter amplitude in superconductors, has been observed. The mechanism of this effect has remained not fully understood. In the absence of relaxation processes, the order-parameter amplitude is not affected by the irradiation, since the systems of quasiparticle excitations and Cooper pairs move together and remain in equilibrium with each other. This work demonstrates how the relaxation of quasiparticles by impurity scattering leads to finite coupling between the Higgs mode and light. The suggested theory can be used to study light-matter interaction in anisotropic and multiband superconductors, such as high-temperature cuprates, iron pnictides, and magnesium diboride.

[Phys. Rev. B 99, 224511] Published Tue Jun 18, 2019

]]>Recent studies confirmed that the long-searched-for phonon-mediated superconducting phase in graphene may be induced via lithium deposition. However, it is also suggested that lithium-decorated graphene (${\mathrm{LiC}}_{6}$) behaves as a canonical superconductor, despite the moderate electron-phonon coupling const...

[Phys. Rev. B 99, 224512] Published Tue Jun 18, 2019

]]>Topological quantum field theory (TQFT) is a very powerful theoretical tool to study topological phases and phase transitions. In $2+1d$, it is well known that the Chern-Simons theory captures all the universal topological data of topological phases, e.g., quasiparticle braiding statistics, chiral cen...

[Phys. Rev. B 99, 235137] Published Tue Jun 18, 2019

]]>The generalized statistical dynamical theory of x-ray scattering by imperfect single crystals with randomly distributed Coulomb-type defects has been extended to characterize structure imperfections in the real multilayers of arbitrary thickness in Bragg diffraction geometry. The recurrence relation...

[Phys. Rev. B 99, 235304] Published Tue Jun 18, 2019

]]>Hybrid semiconductor/superconductor devices constitute an important platform for a wide range of applications, from quantum computing to topological-state-based architectures. Here, we demonstrate full modulation of the interference pattern in a superconducting interference device with two parallel ...

[Phys. Rev. B 99, 235419] Published Tue Jun 18, 2019

]]>We investigated the electronic structure of monolayer ${\mathrm{VTe}}_{2}$ grown on bilayer graphene by angle-resolved photoemission spectroscopy (ARPES). We found that monolayer ${\mathrm{VTe}}_{2}$ takes the octahedral $1T$ structure in contrast to the monoclinic one in the bulk, as evidenced by the good agreement in the Fermi sur...

[Phys. Rev. B 99, 241404(R)] Published Tue Jun 18, 2019

]]>${\mathrm{TiPO}}_{4}$ shows interesting structural and magnetic properties as temperature and pressure are varied, such as a spin-Peierls phase transition and the development of incommensurate modulations of the lattice. Recently, high-pressure experiments for ${\mathrm{TiPO}}_{4}$ reported two structural phases appearing at high ...

[Phys. Rev. B 99, 245132] Published Tue Jun 18, 2019

]]>We investigate a mesoscopic refrigerator based on chiral quantum Hall edge channels. We discuss a three-terminal cooling device in which charge transport occurs only between a pair of voltage-biased terminals. The third terminal, which is to be cooled, is set as a voltage probe with vanishing partic...

[Phys. Rev. B 99, 245304] Published Tue Jun 18, 2019

]]>We model the change in the linear optical functions due to the propagation of a strain wave through a crystalline slab. Defects in the slab are introduced by arbitrarily displacing one of the atomic layers. The perturbing wave is assumed to be produced by laser light absorption; the properties of th...

[Phys. Rev. B 99, 245305] Published Tue Jun 18, 2019

]]>Light-matter interactions in conventional nanophotonic structures typically lack directionality. For example, differently from microwave antenna systems, most optical emitters (e.g., excited atoms/molecules and simple nanoantennas) exhibit quasi-isotropic dipolar radiation patterns with low directiv...

[Phys. Rev. B 99, 245414] Published Tue Jun 18, 2019

]]>The electronic Hong-Ou-Mandel interferometer in the integer quantum Hall regime is an ideal system to probe the building up of quantum correlations between charge carriers and it has been proposed as a viable platform for quantum computing gates. Using a parallel implementation of the split-step Fou...

[Phys. Rev. B 99, 245415] Published Tue Jun 18, 2019

]]>The behavior of silicon carbide (SiC) under shock compression is of interest due to its applications as a high-strength ceramic and for general understanding of shock-induced polymorphism. Here we use the Matter in Extreme Conditions beamline of the Linac Coherent Light Source to carry out a series ...

[Phys. Rev. B 99, 214106] Published Mon Jun 17, 2019

]]>Charged particles in a two-dimensional lattice behave like a Chern topological insulator when subject to a perpendicular magnetic field. Here, the authors propose a realistic scheme to use neutral atoms in optical lattices to simulate the effect of the magnetic field and to study transport in the strong field regime, which is not accessible when working with conventional materials. Importantly, the topological behavior of these so-called magnetic quantum walks extends even beyond the Chern insulator model because they are periodically driven in time,. Magnetic quantum walks may open a new route to studying topological properties of charged particles in strong magnetic fields.

[Phys. Rev. B 99, 214303] Published Mon Jun 17, 2019

]]>We present Raman spectroscopy measurements of the van der Waals bonded ferromagnet ${\mathrm{Fe}}_{3-x}{\mathrm{GeTe}}_{2}$, together with lattice dynamics. Four out of eight Raman active modes are observed and assigned, in agreement with numerical calculations. The energies and linewidths of the observed modes display an unconv...

[Phys. Rev. B 99, 214304] Published Mon Jun 17, 2019

]]>Inelastic scattering of photons is a promising technique to manipulate magnons but it suffers from weak intrinsic coupling. We theoretically discuss an idea to increase optomagnonic coupling in optical whispering gallery mode cavities by generalizing a previous analysis to include the exchange inter...

[Phys. Rev. B 99, 214423] Published Mon Jun 17, 2019

]]>We present theoretically the thermal Hall effect of magnons in a ferromagnetic lattice with a Kekule-O coupling (KOC) modulation and a Dzyaloshinskii-Moriya interaction (DMI). Through a strain-based mechanism for inducing the KOC modulation, we identify four topological phases in terms of the KOC pa...

[Phys. Rev. B 99, 214424] Published Mon Jun 17, 2019

]]>We consider a thin film of superfluid ${}^{3}\mathrm{He}$ under conditions that stabilize the $A$ phase. We show that in the presence of a uniform superflow and an external magnetic field perpendicular to the film, the spin degrees of freedom develop a nonuniform, helical texture. Our prediction is robust and relies ...

[Phys. Rev. B 99, 214506] Published Mon Jun 17, 2019

]]>Recent experiments show the spontaneous breaking of rotational symmetry in the superconducting topological insulators ${M}_{x}{\mathrm{Bi}}_{2}{\mathrm{Se}}_{3}$ ($M$ represents Cu, Sr, or Nd), suggesting that the pairing belongs to a two-dimensional representation of the ${D}_{3d}$ symmetry group of the crystal. Motivated by this progress, w...

[Phys. Rev. B 99, 214507] Published Mon Jun 17, 2019

]]>The field of heavy-fermion physics emerged nearly four decades ago and has since remained one of the most prominent research directions in condensed-matter physics. Nonetheless, while significant progress has been made in unraveling heavy-fermion behavior and accompanying exotic phenomena, many ques...

[Phys. Rev. B 99, 220403(R)] Published Mon Jun 17, 2019

]]>Much of what we know about quantum criticality comes from studies of quantum phase transitions between paramagnetic and magnetically ordered phases. These are usually driven by magnetic field or pressure. Here, the authors report that in CsFeCl${}_{3}$, one of the precious few materials exhibiting pressure-induced magnetic order, a similar transition can also be induced by chemical substitution. Cs${}_{1-x}$Rb${}_{x}$FeCl${}_{3}$ continuously evolves from a gapped quantum paramagnet to a critical gapless state and finally to magnetic long-range order. No bulky pressure cells are required, which makes all thermodynamic and spectroscopic properties easily accessible to measurement.

[Phys. Rev. B 99, 224420] Published Mon Jun 17, 2019

]]>We present a theoretical study of the effects of optical fields on a ferromagnetic model system of itinerant carriers that includes both magnetism at the level of a time-dependent mean-field and spin-orbit coupling. In the framework of this model, which contains a band gap and is similar to the one ...

[Phys. Rev. B 99, 224421] Published Mon Jun 17, 2019

]]>The interplay of spin and charge degrees of freedom, introduced by doping mobile holes into a Mott insulator with strong antiferromagnetic (AFM) correlations, is at the heart of strongly correlated matter such as high-${T}_{c}$ cuprate superconductors. Here, we capture this interplay in the strong coupling...

[Phys. Rev. B 99, 224422] Published Mon Jun 17, 2019

]]>We study isotropic antiferromagnetic Heisenberg chains coupled by antiferromagnetic Ising interaction as an effective spin model for the ytterbium aluminum perovskite ${\mathrm{YbAlO}}_{3}$. Using the density-matrix renormalization group (DMRG) method we calculate the magnetization curve, local spin, central charge...

[Phys. Rev. B 99, 224423] Published Mon Jun 17, 2019

]]>The antiferromagnetic order in the heavy-fermion compound ${\mathrm{CeCu}}_{2}{\mathrm{Ge}}_{2}$ can be suppressed by Co-doping, and at critical composition ${x}_{c}=0.6$ (${T}_{N}\phantom{\rule{0.16em}{0ex}}\to 0$ K) a quantum critical point has been observed. We have performed zero-field (ZF) and longitudinal-field muon spin relaxation ($\mu \mathrm{SR}$) measurements on polycrystalli...

[Phys. Rev. B 99, 224424] Published Mon Jun 17, 2019

]]>The interplay between interband and intraband pairing interactions in multiband systems can result in superconducting order parameter with the broken time-reversal symmetry (BTRS). Here we consider a slightly inhomogeneous superconductor with the BTRS order parameter in the framework of Ginzburg-Lan...

[Phys. Rev. B 99, 224508] Published Mon Jun 17, 2019

]]>A comprehensive angle-resolved photoemission spectroscopy study of the band structure in single-layer cuprates is presented with the aim of uncovering universal trends across different materials. Five different hole- and electron-overdoped cuprate superconductors (${\mathrm{La}}_{1.59}{\mathrm{Eu}}_{0.2}{\mathrm{Sr}}_{0.21}{\mathrm{CuO}}_{4}$, ${\mathrm{La}}_{1.77}{\mathrm{Sr}}_{0.23}{\mathrm{...}}_{}$

[Phys. Rev. B 99, 224509] Published Mon Jun 17, 2019

]]>In multiband superconductors, multiple collective modes exist associated with the multiple order parameters. Oscillations of the amplitude and the relative phase of the order parameters are called Higgs and Leggett modes, respectively. Recently, it has been suggested that nonmagnetic impurity scatte...

[Phys. Rev. B 99, 224510] Published Mon Jun 17, 2019

]]>Nonlocal order parameters in space-time are proposed to characterize the unconventional orbital-selective conducting state in fulleride superconductors, called the Jahn-Teller metal. In previous works, it has been argued that this state can be interpreted as a spontaneous orbital-selective Mott stat...

[Phys. Rev. B 99, 235133] Published Mon Jun 17, 2019

]]>From the Kubo formula for transport in a tilted Weyl semimetal, we calculate the absorptive part of the dynamic conductivity for both right- and left-handed circular polarized light. These depend on the real part of the longitudinal conductivity and the imaginary part of the transverse (Hall) conduc...

[Phys. Rev. B 99, 235134] Published Mon Jun 17, 2019

]]>Low-frequency noise close to the carrier remains little explored in spin-torque nano-oscillators. However, it is crucial to investigate as it limits the oscillator's frequency stability. This work addresses the low offset frequency flicker noise of a spin-torque vortex oscillator in the regime of la...

[Phys. Rev. B 99, 235135] Published Mon Jun 17, 2019

]]>Electrical transport properties near an electronic Ising-nematic quantum critical point in two dimensions are of both theoretical and experimental interest. In this work, we derive a kinetic equation valid in a broad regime near the quantum critical point using the memory matrix approach. The formal...

[Phys. Rev. B 99, 235136] Published Mon Jun 17, 2019

]]>We study theoretically the time-domain dynamics of the spin-dependent Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between driven magnetic impurities localized in a spin-orbit-coupled two-dimensional system. Particular attention is given to the influence of the spin-orbit coupling (SOC) on the s...

[Phys. Rev. B 99, 235302] Published Mon Jun 17, 2019

]]>The electronic and transport properties of a three-dimensional (3D) Dirac system are investigated theoretically, which is motivated by recent experimental measurements on quantum and transport mobilities in the 3D Dirac semimetal ${\mathrm{Na}}_{3}\mathrm{Bi}$ by J. Xiong *et al.* [Science **350**, 413 (2015); Europhys. Lett. **114**...

[Phys. Rev. B 99, 235303] Published Mon Jun 17, 2019

]]>Flat bands with extremely narrow bandwidths on the order of a few millielectron volts can appear in twisted multilayer graphene systems for appropriate system parameters. Here we investigate the electronic structure of a twisted bi-bilayer graphene, or twisted double bilayer graphene, to find the pa...

[Phys. Rev. B 99, 235417] Published Mon Jun 17, 2019

]]>The terahertz (THz) to visible irradiation induced current in zigzag and armchair graphene nanoribbons were investigated by focusing on the modulation of the photovoltaic effects by tuning the electric field ($E$) strength. The numerical results show that spin photovoltaic effects in zigzag-edged grap...

[Phys. Rev. B 99, 235418] Published Mon Jun 17, 2019

]]>Two-dimensional Dirac fermions are subjected to two types of interactions, namely, the long-range Coulomb interaction and the short-range on-site interaction. The former induces excitonic pairing if its strength $\alpha $ is larger than some critical value ${\alpha}_{c}$, whereas the latter drives an antiferromagnetic ...

[Phys. Rev. B 99, 245130] Published Mon Jun 17, 2019

]]>We report a detailed magnetotransport study on single crystals of PrBi. The presence of $f$ electrons in this material raises the prospect of realizing a strongly correlated version of topological semimetals. PrBi shows a magnetic-field-induced metal-insulator-like transition below $T\sim 20\phantom{\rule{0.28em}{0ex}}\mathrm{K}$ and a very la...

[Phys. Rev. B 99, 245131] Published Mon Jun 17, 2019

]]>By means of the Lanczos method, a numerically efficient theoretical approach, we study the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction in a graphene bubble. We find that the RKKY interaction in a graphene bubble can be larger or smaller than the corresponding result in pristine graphene by a fe...

[Phys. Rev. B 99, 245410] Published Mon Jun 17, 2019

]]>We investigate if a sharp topological transition in a metal with a large Fermi surface may be detected in transport measurements. In particular, we address if a skew scattering and a side jump on elastic disorder in the bulk of such a metal masks signatures of the topological transition. We conclude...

[Phys. Rev. B 99, 245411] Published Mon Jun 17, 2019

]]>The Berry-phase mediated valley-selected skew scattering in $\alpha -{T}_{3}$ lattices is demonstrated. The interplay of Lorentz and Berry forces in position and momentum spaces is revealed and analyzed. Many-body screening of the electron-impurity interaction is taken into account to avoid overestimation of bac...

[Phys. Rev. B 99, 245412] Published Mon Jun 17, 2019

]]>We investigate atomic collapse in pseudospin-1 Dirac material systems whose energy band structure constitutes a pair of Dirac cones and a flat band through the conic intersecting point. We obtain analytic solutions of the Dirac-Weyl equation for the three-component spinor in the presence of a Coulom...

[Phys. Rev. B 99, 245413] Published Mon Jun 17, 2019

]]>We present results from an experimental technique used to estimate the strength of Ta at extreme pressures (150 GPa) and strain rates (${10}^{7}\phantom{\rule{0.28em}{0ex}}{\mathrm{s}}^{-1}$). A graded-density impactor (GDI) was fabricated using sputter deposition to produce an approximately $40-\mu \mathrm{m}$-thick film containing alternating layers of Al and...

[Phys. Rev. B 99, 214105] Published Fri Jun 14, 2019

]]>We have studied the partially ordered double perovskite (PODP) and spin-glass phase in $\mathrm{Sr}\left(\mathrm{M}{\mathrm{n}}_{1-x}{\mathrm{W}}_{x}\right){\mathrm{O}}_{3}$ ($x=0.20$ to 0.40) using neutron powder diffraction (NPD), muon spin relaxation (μSR), magnetic susceptibility (χ), and x-ray photoelectron spectroscopy measurements. Structural studies reveal that $\mathrm{SrM}{\mathrm{...}}_{}$

[Phys. Rev. B 99, 214421] Published Fri Jun 14, 2019

]]>Information scrambling, characterized by the out-of-time-ordered correlator (OTOC), has attracted much attention, as it sheds new light on chaotic dynamics in quantum many-body systems. The scale invariance, which appears near the quantum critical region in condensed matter physics, is considered to...

[Phys. Rev. B 99, 224305] Published Fri Jun 14, 2019

]]>We report a series of measurements on a $<1$ mg sample of ${}^{248}\mathrm{Cm}$ metal. Magnetization measurements are similar to those reported earlier. X-ray absorption and magnetic circular dichroism (XMCD) measurements at the ESRF synchrotron at the ${M}_{4,5}$ absorption edges show that the element has an orbital mom...

[Phys. Rev. B 99, 224419] Published Fri Jun 14, 2019

]]>Spin-triplet superconductors with time-reversal symmetry breaking can naturally lead to chiral domain walls in their interior. We study the magnetic properties emerging at the interface of chiral domains with opposite winding by focusing on the effects of a superconducting phase drop across the wall...

[Phys. Rev. B 99, 224507] Published Fri Jun 14, 2019

]]>We study symmetry-protected topological (SPT) phases of matter in $2\mathrm{D}$ protected by symmetries acting on fractal subsystems of a certain type. Despite the total symmetry group of such systems being subextensively large, we show that only a small number of phases are actually realizable by local Hamilt...

[Phys. Rev. B 99, 235131] Published Fri Jun 14, 2019

]]>We discuss an extension of higher-order topological phases to include bosonic systems. We present two spin models for a second-order topological phase protected by a global ${\mathbb{Z}}_{2}\times {\mathbb{Z}}_{2}$ symmetry. One model is built from layers of an exactly solvable cluster model for a one-dimensional ${\mathbb{Z}}_{2}\times {\mathbb{Z}}_{2}$ topological pha...

[Phys. Rev. B 99, 235132] Published Fri Jun 14, 2019

]]>It is shown theoretically that the confinement of an electron at a repulsive potential can exist in nanostructures subjected to a strong high-frequency electromagnetic field. As a result of the confinement, the metastable bound electron state of the repulsive potential appears. This effect can lead,...

[Phys. Rev. B 99, 235416] Published Fri Jun 14, 2019

]]>We report the coherent study of structural, transport, and ultrafast dynamic properties of ${\mathrm{V}}_{1-x}\mathrm{N}{\mathrm{b}}_{x}{\mathrm{O}}_{2}$ thin films. Films of a solid solution of ${\mathrm{V}}_{1-x}\mathrm{N}{\mathrm{b}}_{x}{\mathrm{O}}_{2}\phantom{\rule{4pt}{0ex}}(0\le x\le 1)$ are prepared on (0001) sapphire substrates using reactive target bias ion beam deposition. We found that, at room temperature, the low-temper...

[Phys. Rev. B 99, 245129] Published Fri Jun 14, 2019

]]>Hybrid superconducting devices based on high-mobility two-dimensional electron gases with strong spin-orbit coupling are considered to offer a flexible and scalable platform for topological quantum computation. Here, we report the realization and electrical characterization of hybrid devices based o...

[Phys. Rev. B 99, 245302] Published Fri Jun 14, 2019

]]>Two-photon transition rates are investigated in resonance to the ground state in wurtzite GaN/AlN quantum dots. The ground-state transition is two-photon allowed because of the electron-hole separation inherent to polar wurtzite III–nitride heterostructures. We show that this built-in parity-breakin...

[Phys. Rev. B 99, 245303] Published Fri Jun 14, 2019

]]>We study theoretically the interaction of topological Weyl semimetals with an ultrafast optical pulse. The electron dynamics in such material is coherent and highly anisotropic. For some directions of pulse polarization, the electric dynamics is irreversible, which means that the residual electron c...

[Phys. Rev. B 99, 245409] Published Fri Jun 14, 2019

]]>We study in this paper effects of Dzyaloshinskii-Moriya (DM) magnetoelectric coupling between ferroelectric and magnetic layers in a superlattice formed by alternate magnetic and ferroelectric films. Magnetic films are films of simple cubic lattice with Heisenberg spins interacting with each other v...

[Phys. Rev. B 99, 214420] Published Thu Jun 13, 2019

]]>We propose to investigate the full counting statistics of nonequilibrium spin transport with an ultracold atomic quantum gas. The setup makes use of the spin control available in atomic systems to generate spin transport induced by an impurity atom immersed in a spin-imbalanced two-component Fermi g...

[Phys. Rev. B 99, 214505] Published Thu Jun 13, 2019

]]>Inelastic neutron scattering was performed for an iron-based superconductor ${\mathrm{LaFeAsO}}_{0.9}{\mathrm{D}}_{0.1}$, where most of D (deuterium) replaces oxygen, while a tiny amount goes into the interstitial sites. By first-principles calculation, we characterize the interstitial sites for D (and for H slightly mixed) with...

[Phys. Rev. B 99, 220505(R)] Published Thu Jun 13, 2019

]]>We study the ground state and low-lying excited states of the Kitaev-Heisenberg model on a two-leg ladder geometry using the density-matrix renormalization-group and Lanczos exact diagonalization methods. The Kitaev and Heisenberg interactions are parametrized as $K=sin\varphi $ and $J=cos\varphi $ with an angle para...

[Phys. Rev. B 99, 224418] Published Thu Jun 13, 2019

]]>Motivated by recent experiments realizing correlated phenomena and superconductivity in two-dimensional (2D) van der Waals devices, we consider the general problem of whether correlation effects may be enhanced by modifying band structure while keeping a fixed weak interaction strength. Using determ...

[Phys. Rev. B 99, 235128] Published Thu Jun 13, 2019

]]>We report on magnetic and electronic properties of the $B$-site-ordered double-perovskite $\mathrm{L}{\mathrm{a}}_{2}\mathrm{CrMn}{\mathrm{O}}_{6}$ films grown by pulsed-laser deposition. The magnetic-field dependence of magnetization curves showed hysteresis at low temperatures regardless of the degree of Cr/Mn order and the saturation magnetizati...

[Phys. Rev. B 99, 235129] Published Thu Jun 13, 2019

]]>We study the symmetric periodic Anderson model of the conduction electrons hybridized with the localized correlated electrons on a square lattice. Using the canonical representation of electrons by B. Kumar [Phys. Rev. B **77**, 205115 (2008)], we do a self-consistent theory of its effective charge and ...

[Phys. Rev. B 99, 235130] Published Thu Jun 13, 2019

]]>We present systematic *ab initio* calculations of the charge carrier correlations between adjacent layers of two-dimensional materials in the presence of both charged impurity and strain disorder potentials using the examples of monolayer and bilayer graphene. Our analysis yields unambiguous first-pri...

[Phys. Rev. B 99, 235415] Published Thu Jun 13, 2019

]]>We consider the interaction-driven Mott transition at zero temperature from the viewpoint of microscopic Fermi liquid theory. To this end, we derive an exact expression for the Landau parameters within the dynamical mean-field theory (DMFT) approximation to the single-band Hubbard model. At the Mott...

[Phys. Rev. B 99, 245128] Published Thu Jun 13, 2019

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