We characterize the europium $\left({\mathrm{Eu}}^{3+}\right)$ hyperfine interaction of the excited state $\left({}^{5}\mathrm{D}_{0}\right)$ and determine its effective spin Hamiltonian parameters for the Zeeman and quadrupole tensors. An optical free induction decay method is used to measure all hyperfine splittings under a weak external magnetic field ...

[Phys. Rev. B 97, 094416] Published Fri Mar 16, 2018

]]>In current studies of mean-field quantum spin systems, much attention is placed on the calculation of the ground-state energy and the excitation gap, especially the latter, which plays an important role in quantum annealing. In pure systems, the finite gap can be obtained by various existing methods...

[Phys. Rev. B 97, 094417] Published Fri Mar 16, 2018

]]>It is highly desirable to combine the full spin polarization of carriers with modern semiconductor technology for spintronic applications. For this purpose, one needs good crystalline ferromagnetic (or ferrimagnetic) semiconductors with high Curie temperatures. Rutile ${\mathrm{CrO}}_{2}$ is a half-metallic spintro...

[Phys. Rev. B 97, 094418] Published Fri Mar 16, 2018

]]>We explore the problem of scattering in a medium modulated by a superluminal rectangular pulse, with the pulse modulation realized through transverse excitations. We solve this problem in the moving frame where the modulation appears purely temporal, since the solution to a purely temporal modulatio...

[Phys. Rev. B 97, 104305] Published Fri Mar 16, 2018

]]>The Born-Markov approximation is widely used to study the dynamics of open quantum systems coupled to external baths. Using Keldysh formalism, we show that the dynamics of a system of bosons (fermions) linearly coupled to a noninteracting bosonic (fermionic) bath falls outside this paradigm if the b...

[Phys. Rev. B 97, 104306] Published Fri Mar 16, 2018

]]>For high-spin centers, one of the key spectroscopic fingerprints is the zero-field splitting (ZFS) addressable by electron paramagnetic resonance. In this paper, an implementation of the spin-spin contribution to the ZFS tensor within the projector augmented-wave (PAW) formalism is reported. We use ...

[Phys. Rev. B 97, 115135] Published Fri Mar 16, 2018

]]>We show that elongated magnetic skyrmions can host Majorana bound states in a proximity-coupled two-dimensional electron gas sandwiched between a chiral magnet and an $s$-wave superconductor. Our proposal requires stable skyrmions with unit topological charge, which can be realized in a wide range of ...

[Phys. Rev. B 97, 115136] Published Fri Mar 16, 2018

]]>Predicting charge transport in organic molecular crystals is notoriously challenging. Carrier mobility calculations in organic semiconductors are dominated by quantum chemistry methods based on charge hopping, which are laborious and only moderately accurate. We compute from first principles the ele...

[Phys. Rev. B 97, 115203] Published Fri Mar 16, 2018

]]>New semimetal systems along with Dirac and Weyl semimetals contain compounds, in which the energy of electron excitations vanishes not at nodes but on lines. A higher dimension of the degeneracy space changes many physical properties. We consider a chain of loops consisting of Dirac spectrum nodes i...

[Phys. Rev. B 97, 115204] Published Fri Mar 16, 2018

]]>Topological insulator surfaces in proximity to superconductors have been proposed as a way to produce Majorana fermions in condensed matter physics. One of the simplest proposed experiments with such a system is Majorana interferometry. Here we consider two possibly conflicting constraints on the si...

[Phys. Rev. B 97, 115424] Published Fri Mar 16, 2018

]]>We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet $\beta \text{\u2212}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key ...

[Phys. Rev. B 97, 125125] Published Fri Mar 16, 2018

]]>We observe a nearly instantaneous triggering of the phase transition in ${\mathrm{VO}}_{2}$ using transient, time-resolved absorption techniques from few-cycle, infrared (1.8 $\mu \mathrm{m}$) laser pulses. The results are in agreement with the Mott-Hubbard insulator model, characterized by electronic holon-doublon pair creation...

[Phys. Rev. B 97, 125126] Published Fri Mar 16, 2018

]]>Topological spin liquids can be described by topological gauge theories with global symmetry. Due to the presence of both nontrivial bulk deconfined gauge fluxes and global symmetry, topological spin liquids are examples of the so-called “symmetry enriched topological phases” (SETs). In this paper, ...

[Phys. Rev. B 97, 125127] Published Fri Mar 16, 2018

]]>In a cubic ferromagnet, small spontaneous lattice distortions are expected below the Curie temperature, but the phenomenon is usually neglected. This study focuses on such an effect in the ${\mathrm{U}}_{4}{\mathrm{Ru}}_{7}{\mathrm{Ge}}_{6}$ compound. Based on DFT calculations, we propose a lattice distortion from the cubic $Im\text{\u2212}3m$ space group ...

[Phys. Rev. B 97, 125128] Published Fri Mar 16, 2018

]]>We report on the optical response of a nonreciprocal bianisotropic metamaterial, consisting of spherical, metal-coated magnetic nanoparticles embedded in an optically active medium, thus combining gyrotropy, plasmonic resonances, and chirality in a versatile design. The corresponding effective mediu...

[Phys. Rev. B 97, 125129] Published Fri Mar 16, 2018

]]>We implement the homodyne detection scheme for an increase in the polarimetric sensitivity in spin noise spectroscopy. Controlling the laser intensity of the local oscillator, which is guided around the sample and does not perturb the measured spin system, we are able to improve the signal-to-noise ...

[Phys. Rev. B 97, 125202] Published Fri Mar 16, 2018

]]>Weyl semimetals are a new paradigmatic topological phase of matter featuring a gapless spectrum. One of its most distinctive features is the presence of Fermi arc surface states. Here, we report on atomistic simulations of the dc conductance and quantum Hall response of a minimal Weyl semimetal. By ...

[Phys. Rev. B 97, 125419] Published Fri Mar 16, 2018

]]>We show that, contrary to previous suggestions based on computer simulations or erroneous theoretical treatments, the critical points of the random-field Ising model out of equilibrium, when quasistatically changing the applied source at zero temperature, and in equilibrium are not in the same unive...

[Phys. Rev. B 97, 094204] Published Thu Mar 15, 2018

]]>We have considered the model of the phase transition of the second order for the Coulomb frustrated 2D charged system. The coupling of the order parameter with the charge was considered as the local temperature. We have found that in such a system, an appearance of the phase-separated state is possi...

[Phys. Rev. B 97, 094415] Published Thu Mar 15, 2018

]]>Friction between sliding objects is a phenomenon so ubiquitous that it is easily forgotten how few of its microscopic details are properly understood. To gain new insight into the dynamical mechanism of sliding dissipation, the authors investigate a minimal model of a rigid slider traveling over a harmonic substrate. With the analytical tools of linear response theory, the authors obtain an expression for the dynamical friction that depends on known static physical quantities. This result sheds new light on the physical intertwining between dissipation and the phononic degrees of freedom of the substrate.

[Phys. Rev. B 97, 104104] Published Thu Mar 15, 2018

]]>Periodic photonic structures such as metamaterials, plasmonic lattices, and excitons strongly coupled to photonic crystals are governed by non-Hermitian wave operators with explicitly energy-dependent potentials. The resulting eigenstates no longer form a basis of the vector space of physical states, nor are they normalizable via the common scalar product. This poses particular problems for the calculation of Green functions and densities of states. Here, the authors solve this challenge via the adjoint operator and modes for arbitrary dispersive and lossy periodic systems. This work can be readily adapted to nonoptical complex band-structure problems with energy-dependent potentials, e.g., within solid-state theory.

[Phys. Rev. B 97, 104203] Published Thu Mar 15, 2018

]]>We present muon spin relaxation ($\mu \mathrm{SR}$) measurements of the extended kagome systems ${\mathrm{YBaCo}}_{4}{\mathrm{O}}_{7+\delta}$ ($\delta =0,0.1$), comprising two interpenetrating kagome sublattice of $\mathrm{Co}{\left(\mathrm{I}\right)}^{3+}$ ($S=3/2$) and a triangle sublattice of $\mathrm{Co}{\left(\mathrm{II}\right)}^{2+}$ ($S=2$). The zero- and longitudinal-field $\mu \mathrm{SR}$ spectra of the stoichiometric compound ${\mathrm{YBaCo}}_{4}{\mathrm{...}}_{}$

[Phys. Rev. B 97, 104409] Published Thu Mar 15, 2018

]]>The spin reorientation (SR) and magnetoelastic properties of pseudobinary ferromagnetic $\mathrm{T}{\mathrm{b}}_{1-x}\mathrm{N}{\mathrm{d}}_{x}\mathrm{C}{\mathrm{o}}_{2}$ ($0\le x\le 1.0$) systems involving a morphotropic phase boundary (MPB) were studied by high-resolution synchrotron x-ray diffraction (XRD), magnetization, and magnetostriction measurements. The easy magnetiz...

[Phys. Rev. B 97, 104410] Published Thu Mar 15, 2018

]]>Ambient-pressure-grown ${\mathrm{LaO}}_{0.5}{\mathrm{F}}_{0.5}{\mathrm{BiS}}_{2}$ with a superconducting transition temperature ${T}_{c}\sim 3$ K possesses a highly anisotropic normal state. By a series of electrical resistivity measurements with a magnetic-field direction varying between the crystalline $c$ axis and the $ab$ plane, we present datasets disp...

[Phys. Rev. B 97, 104509] Published Thu Mar 15, 2018

]]>Three-dimensional topological Dirac semimetals are a new state of matter. The authors report on experiments that directly access the electronic structure of two-dimensional states in the prototype topological Dirac semimetal Cd${}_{3}$As${}_{2}$. By modulating the carrier density of very thin, epitaxial Cd${}_{3}$As${}_{2}$ films, using the electric field effect, the authors tune the electronic states through a two-dimensional Dirac point, as evidenced by a minimum in the density of states. Moreover, the linear energy dispersion and the presence of a zero-energy Landau level establish the topological nature of the two-dimensional states in this three-dimensional Dirac semimetal.

[Phys. Rev. B 97, 115132] Published Thu Mar 15, 2018

]]>We report the experimental realization of a Dirac semimetal state in NdSb, a material with antiferromagnetic ground state. The occurrence of a topological semimetal state has been well supported by our band structure calculations and the experimental observation of chiral-anomaly-induced negative ma...

[Phys. Rev. B 97, 115133] Published Thu Mar 15, 2018

]]>We obtain a controlled description of a strongly correlated regime of electronic behavior. We begin by arguing that there are two ways to characterize the electronic degree of freedom, either by the canonical fermion algebra or the graded Lie algebra $\mathfrak{su}\left(2\right|2)$. The first underlies the Fermi liquid des...

[Phys. Rev. B 97, 115134] Published Thu Mar 15, 2018

]]>Traditionally, quantum oscillations were interpreted as the hallmark of a Fermi surface. Recently, it was understood that in order to have well defined de Haas–van Alphen oscillations the presence of a Fermi surface is not required. Following the Luttinger approach, we investigate the oscillations o...

[Phys. Rev. B 97, 115202] Published Thu Mar 15, 2018

]]>Recently, constructing van der Waals (vdW) heterojunctions by stacking different two-dimensional (2D) materials has been considered to be effective strategy to obtain the desired properties. Here, through first-principles calculations, we find theoretically that the 2D $n$-InSe/$p$-GeSe(SnS) vdW heteroj...

[Phys. Rev. B 97, 115416] Published Thu Mar 15, 2018

]]>We investigate theoretically magnetism and magnetic phase transitions induced by electrostatic gating of two-dimensional square metal-organic framework compounds. We find that electrostatic gating can induce phase transitions between homogeneous ferromagnetic and various spin-textured antiferromagne...

[Phys. Rev. B 97, 115419] Published Thu Mar 15, 2018

]]>Thin topological insulator (TI) films support optical and acoustic plasmonic modes characterized by effective net charge or net spin density, respectively. We combine many-body and electromagnetic calculations to study how these modes can be selectively excited at films and nanodisks at infrared and...

[Phys. Rev. B 97, 115420] Published Thu Mar 15, 2018

]]>The successful realization of metamaterials and metasurfaces requires the judicious choice of constituent elements. In this paper, we demonstrate the implementation of time-varying metamaterials in the terahertz frequency regime by utilizing graphene-wrapped microwires as building blocks and modulat...

[Phys. Rev. B 97, 115421] Published Thu Mar 15, 2018

]]>We have measured the electronic heat capacity of thin film nanowires of copper and silver at temperatures 0.1–0.3 K; the films were deposited by standard electron-beam evaporation. The specific heat of the Ag films of sub-100-nm thickness agrees with the bulk value and the free-electron estimate, wh...

[Phys. Rev. B 97, 115422] Published Thu Mar 15, 2018

]]>Interactions between charge carriers in graphene lead to logarithmic renormalization of observables mimicking the behavior known in (3+1)-dimensional quantum electrodynamics (QED). Here we analyze soft electron-hole $\left(e\text{\u2212}h\right)$ excitations generated as a result of fast charge dynamics, a direct analog of ...

[Phys. Rev. B 97, 115423] Published Thu Mar 15, 2018

]]>Magnetic atomic chains grown on top of conventional superconductors may form an interesting and promising platform for the study of Majorana zero modes. Despite the strong evidence already provided with a state-of-art scanning tunneling microscope (STM) technique, clear features beyond the energetic and spatial ones are required to exclude the only remaining alternative interpretation of the zero modes as trivial Shiba states accidentally occurring at zero energy. The authors here propose a robust spin signature for this purpose. This signature is rooted in two sum rules that dictate the distribution of spin densities in a superconducting state with respect to a normal state, and has been recently detected with spin-polarized STM technique that implicitly takes advantage of the sum rules.

[Phys. Rev. B 97, 125119] Published Thu Mar 15, 2018

]]>Using the local density approximation plus dynamical mean-field theory (LDA+DMFT), we have computed the valence-band photoelectron spectra and magnetic excitation spectra of ${\mathrm{BiFeO}}_{3}$, one of the most studied multiferroics. Within the DMFT approach, the local impurity problem is tackled by the exact di...

[Phys. Rev. B 97, 125120] Published Thu Mar 15, 2018

]]>Coulomb interactions famously drive three-dimensional quadratic band crossing semimetals into a non-Fermi liquid phase of matter. In a previous work [Nandkishore and Parameswaran, Phys. Rev. B **95**, 205106 (2017)], the effect of disorder on this non-Fermi liquid phase was investigated, assuming that t...

[Phys. Rev. B 97, 125121] Published Thu Mar 15, 2018

]]>We investigated the orbital hybridization mechanism in $3d-5d$ double perovskites (DPs) of ${\mathrm{La}}_{2}{\mathrm{CoIrO}}_{6}$ and ${\mathrm{La}}_{2}{\mathrm{CoPtO}}_{6}$ using x-ray absorption spectroscopy. It is clearly evidenced by O $K$-edge and Co $K$-edge x-ray absorption spectra that the Co $3d$ orbitals hybridize not only with the half-filled Ir/Pt ${j}_{\mathrm{eff}}$ ...

[Phys. Rev. B 97, 125123] Published Thu Mar 15, 2018

]]>We propose a machine-learning method for evaluating the potential barrier governing atomic transport based on the preferential selection of dominant points for atomic transport. The proposed method generates numerous random samples of the entire potential energy surface (PES) from a probabilistic Ga...

[Phys. Rev. B 97, 125124] Published Thu Mar 15, 2018

]]>We investigate the ${\mathrm{CaF}}_{1}/\mathrm{Si}\left(111\right)$ interface using a combination of high-resolution scanning tunneling and noncontact atomic force microscopy operated at cryogenic temperature as well as x-ray photoelectron spectroscopy. Submonolayer ${\mathrm{CaF}}_{1}$ films grown at substrate temperatures between 550 and 600 ${}^{\circ}\mathrm{C}$ on $\mathrm{...}$

[Phys. Rev. B 97, 125418] Published Thu Mar 15, 2018

]]>Raman spectroscopy is employed to probe directly the soft rotation and tilting modes, which are two primary order parameters predicted in the hybrid improper ferroelectric material ${\mathrm{Ca}}_{3}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$. We observe a giant softening of the $107-{\mathrm{cm}}^{-1}$ octahedron tilting mode by $26\phantom{\rule{0.28em}{0ex}}{\mathrm{cm}}^{-1}$ on heating through the structu...

[Phys. Rev. B 97, 094104] Published Wed Mar 14, 2018

]]>A series of iron arsenides (e.g., ${\text{CaRbFe}}_{4}{\text{As}}_{4},{\text{SrCsFe}}_{4}{\text{As}}_{4}$) have been discovered recently, and have provoked a rise in superconductor searches in a different phase, known as the 1144 phase. For the presence of various chemical substitutions, it is believed that more 1144 compounds remain to be discove...

[Phys. Rev. B 97, 094105] Published Wed Mar 14, 2018

]]>The lattice dynamics in ${\mathrm{MnFe}}_{0.95}{\mathrm{Si}}_{0.50}{\mathrm{P}}_{0.50}$ were investigated experimentally using ${}^{57}\mathrm{Fe}$ nuclear inelastic scattering and inelastic x-ray scattering across the first-order magnetic transition which occurs close to room temperature. The lattice dynamics characterization was supported by a macroscopic ...

[Phys. Rev. B 97, 094303] Published Wed Mar 14, 2018

]]>The magnetism of a dense assembly of ultrasmall ferrimagnetic nanoparticles exhibits unique features due to the combination of intraparticle and strong interparticle interactions. To model such system we need to account for the internal particle structure and the short- and long-range interparticle ...

[Phys. Rev. B 97, 094413] Published Wed Mar 14, 2018

]]>We investigate the quantum dynamics of many-body systems subject to local (i.e., restricted to a limited space region) time-dependent perturbations. If the system crosses a quantum phase transition, an off-equilibrium behavior is observed, even for a very slow driving. We show that, close to the tra...

[Phys. Rev. B 97, 094414] Published Wed Mar 14, 2018

]]>We study the intrinsic fully gapped odd-parity superconducting order in doped nodal-loop materials with a torus-shaped Fermi surface. We show that the mirror symmetry, which protects the nodal loop in the normal state, also protects the superconducting state as a topological crystalline superconduct...

[Phys. Rev. B 97, 094508] Published Wed Mar 14, 2018

]]>We have investigated the Se isotope effect in the layered bismuth chalcogenide ($\mathrm{BiC}{\mathrm{h}}_{2}$-based) superconductor $\mathrm{La}{\mathrm{O}}_{0.6}{\mathrm{F}}_{0.4}\mathrm{Bi}{\left(\mathrm{S},\mathrm{Se}\right)}_{2}$ with ${}^{76}\mathrm{Se}$ and ${}^{80}\mathrm{Se}$. For all examined samples, the Se concentration, which is linked to the superconducting properties, is successfully controlled within $x=1.09\u20131.14$ in $\mathrm{La}{\mathrm{O}}_{\mathrm{0...}}$

[Phys. Rev. B 97, 094509] Published Wed Mar 14, 2018

]]>To verify the first-order liquid-liquid transition (LLT) in liquid Cs reported by Falconi *et al.* [Phys. Rev. Lett. **94**, 125507 (2005).], the pressure dependence of liquid density was measured up to 5 GPa by an x-ray absorption method. The results showed that the density continuously increases over th...

[Phys. Rev. B 97, 100101(R)] Published Wed Mar 14, 2018

]]>In-plane longitudinal and transverse thermoelectric phenomena in two parent compounds of iron-based superconductors are studied. Namely, the Seebeck ($S$) and Nernst (*ν*) coefficients were measured in the temperature range 10–300 K for $\mathrm{BaF}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{s}}_{2}$ and $\mathrm{CaF}{\mathrm{e}}_{2}\mathrm{A}{\mathrm{s}}_{2}$ single crystals that were detwinned *in situ.* ...

[Phys. Rev. B 97, 100506(R)] Published Wed Mar 14, 2018

]]>We report ${}^{139}\mathrm{La}$ and ${}^{63}\mathrm{Cu}$ NMR investigation of the successive charge order, spin order, and superconducting transitions in superoxygenated ${\mathrm{La}}_{2}{\mathrm{CuO}}_{4+y}$ single crystal with stage-4 excess oxygen order at ${T}_{\text{stage}}\simeq 290$ K. We show that the stage-4 order induces tilting of ${\mathrm{CuO}}_{6}$ octahedra below ${T}_{\text{stage}}$, which in...

[Phys. Rev. B 97, 104506] Published Wed Mar 14, 2018

]]>We present a first-principles band calculation for the quasi-one-dimensional (Q1D) organic superconductor ${\left(\mathrm{TMTSF}\right)}_{2}{\mathrm{ClO}}_{4}$. An effective tight-binding model with the TMTSF molecule to be regarded as the site is derived from a calculation based on maximally localized Wannier orbitals. We apply a two-part...

[Phys. Rev. B 97, 104507] Published Wed Mar 14, 2018

]]>We establish the topology of the spin-singlet superconducting states in the bare hyperhoneycomb lattice, and we derive analytically the full phase diagram using only symmetry and topology in combination with simple energy arguments. The phase diagram is dominated by two states preserving time-revers...

[Phys. Rev. B 97, 104508] Published Wed Mar 14, 2018

]]>For $D$-dimensional weakly interacting topological insulators in certain symmetry classes, the topological invariant can be calculated from a $D$- or $(D+1)$-dimensional integration over a certain curvature function that is expressed in terms of single-particle Green's functions. Based on the divergence o...

[Phys. Rev. B 97, 115130] Published Wed Mar 14, 2018

]]>This paper experimentally demonstrates the effects of inharmonic photonic transition in tailored aperiodic space-time refractive index modulated media. Such effects introduce a pure frequency mixing based on the simultaneous and distinct shifts in the spatial and temporal frequencies. The medium is ...

[Phys. Rev. B 97, 115131] Published Wed Mar 14, 2018

]]>Topological nodal rings can be classified into three types according to the slopes in their energy dispersion. Type-I nodal rings consist of type-I points, type-II rings consist of type-II points, and type-III rings consist of anisotropic points. Taking carbon networks as an example, we show that al...

[Phys. Rev. B 97, 121108(R)] Published Wed Mar 14, 2018

]]>We have studied the structural, electronic, and magnetic properties of spinel ${\mathrm{Co}}_{3}{\mathrm{O}}_{4}$(111) surfaces and their interfaces with ZnO(0001) using density functional theory within the generalized gradient approximation with the on-site Coulomb repulsion term. Two possible forms of spinel surface, containin...

[Phys. Rev. B 97, 125304] Published Wed Mar 14, 2018

]]>The generalized tight-binding model is developed to investigate the rich and unique electronic properties of $AB$-bt (bottom-top) bilayer silicene under uniform perpendicular electric and magnetic fields. The first pair of conduction and valence bands, with an observable energy gap, displays unusual e...

[Phys. Rev. B 97, 125416] Published Wed Mar 14, 2018

]]>The nonlinear magneto-optic responses are investigated for gapped graphene and doped graphene in a perpendicular magnetic field. The electronic states are described by Landau levels, and the electron dynamics in an optical field is obtained by solving the density matrix in the equation of motion. In...

[Phys. Rev. B 97, 125417] Published Wed Mar 14, 2018

]]>Zirconium tungstate undergoes a sequence of phase transitions from cubic ($\alpha -{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$) to orthorhombic ($\gamma -{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$) to amorphous ($a-{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$) upon increasing pressure at room temperature. The amorphous phase is known to undergo anomalous endothermic recrystallization into a high-temperature $\beta -{\mathrm{ZrW}}_{2}{\mathrm{O}}_{8}$ phase ...

[Phys. Rev. B 97, 094203] Published Tue Mar 13, 2018

]]>The phase diagram of a cubic chiral magnet MnSi with multiple Dzyaloshinskii-Moriya (DM) vectors as a function of temperature $T$ and dc magnetic field ${H}_{\mathrm{dc}}$ was investigated using intensity mapping of the odd-harmonic responses of ac magnetization $({M}_{1\omega}$ and ${M}_{3\omega})$, and the responses at phase boundaries we...

[Phys. Rev. B 97, 094411] Published Tue Mar 13, 2018

]]>Weyl nodes have been experimentally realized in photonic, electronic, and phononic crystals. However, magnonic Weyl nodes are yet to be seen experimentally. In this paper, we propose Weyl magnon nodes in noncoplanar stacked frustrated kagome antiferromagnets, naturally available in various real mate...

[Phys. Rev. B 97, 094412] Published Tue Mar 13, 2018

]]>We study the motion of an electron bubble in the zero-temperature limit where neither phonons nor rotons provide a significant contribution to the drag exerted on an ion moving within the superfluid. By using the Gross-Clark model, in which a Gross-Pitaevskii equation for the superfluid wave functio...

[Phys. Rev. B 97, 094507] Published Tue Mar 13, 2018

]]>Three models of the ${\mathrm{C}}_{60}$ molecular crystal are studied using molecular dynamics simulations to resolve the roles played by intermolecular and intramolecular degrees of freedom (DOF) in its structural, mechanical, and thermal properties at temperatures between 35 and 400 K. In the full DOF model, all ...

[Phys. Rev. B 97, 104303] Published Tue Mar 13, 2018

]]>Raman spectroscopy experiments on single crystals of ${\mathrm{CuSb}}_{2}{\mathrm{O}}_{6}$ and ${\mathrm{CoSb}}_{2}{\mathrm{O}}_{6}$ quasi-one-dimensional antiferromagnets with trirutile crystal structure were performed, with a focus on the first material. The observed Raman-active phonon modes and previously reported infrared-active modes were identified wi...

[Phys. Rev. B 97, 104304] Published Tue Mar 13, 2018

]]>Using time-dependent Ginzburg-Landau theory we find oscillations of critical current density ${j}_{c}$ as a function of the length $L$ of the bridge formed from a two-band superconductor. We explain this effect by the appearance of the phase solitons in the bridge at $j<{j}_{c}$, whose number changes with a chan...

[Phys. Rev. B 97, 104505] Published Tue Mar 13, 2018

]]>The nature of the ground state of the spin $S=1/2$ Heisenberg antiferromagnet on the kagome lattice with breathing anisotropy (i.e., with different superexchange couplings ${J}_{\u25b5}$ and ${J}_{\u25bf}$ within elementary up- and down-pointing triangles) is investigated within the framework of Gutzwiller projected fermioni...

[Phys. Rev. B 97, 115127] Published Tue Mar 13, 2018

]]>The Edelstein effect occurring in systems with broken inversion symmetry generates a spin polarization when an electric field is applied, which is most advantageous in spintronics applications. Unfortunately, it became apparent that this kind of magnetoelectric effect is very small in semiconductors...

[Phys. Rev. B 97, 115128] Published Tue Mar 13, 2018

]]>The authors investigate the development of magnetic phases in (Ga,Mn)As – the canonical dilute ferromagnetic semiconductor – in a thoroughly prepared set of high-quality layers grown by molecular beam epitaxy. The Mn content in the (Ga,Mn)As solid solution extends from the extremely diluted (0.0007% Mn) to the medium Mn content of 1.6%. The authors trace simultaneously the evolution of magnetic and electronic properties of (Ga,Mn)As by comprehensive magnetic (SQUID magnetometry) optical (Raman scattering and photoreflectance) and ARPES measurements. The onset of a low-temperature ferromagnetic phase in (Ga,Mn)As is revealed for 1.6% Mn, the composition just slightly above the one displaying purely superparamagnetic behavior (0.9% Mn). No signature of a Mn-related impurity band has been identified in superparamagnetic and ferromagnetic (Ga,Mn)As.

[Phys. Rev. B 97, 115201] Published Tue Mar 13, 2018

]]>Topological crystalline insulator is a recently discovered topological phase of matter. It possesses multiple Dirac surface states, which are protected by the crystal symmetry. This is in contrast to the time-reversal symmetry that is operative in the well-known topological insulators. In the presen...

[Phys. Rev. B 97, 115414] Published Tue Mar 13, 2018

]]>The hydrodynamic Drude model (HDM) has been successful in describing the optical properties of metallic nanostructures, but for semiconductors where several different kinds of charge carriers are present an extended theory is required. We present a two-fluid hydrodynamic model for semiconductors con...

[Phys. Rev. B 97, 115415] Published Tue Mar 13, 2018

]]>An idea of employing the Landau-Zener-Stückelberg-Majorana dynamics to flip a spin of a single ground state hole is introduced and explored by a time-dependent simulation. This configuration interaction study considers a hole confined in a quantum molecule formed in an InSb $\langle 111\rangle $ quantum wire by app...

[Phys. Rev. B 97, 115417] Published Tue Mar 13, 2018

]]>This paper is motivated by an unexpected observation in a recent experiment [S. Tewari *et al.*, Phys. Rev. B **93**, 035420 (2016).], where a robust coherence recovery, starting from a certain energy, was detected for an electron injected into a quantum Hall edge at a filling factor of 2. After passing ...

[Phys. Rev. B 97, 115418] Published Tue Mar 13, 2018

]]>We investigate the transient electronic structure of ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, a parent compound of iron-based superconductors, by time- and angle-resolved photoemission spectroscopy. In order to probe the entire Brillouin zone, we utilize extreme ultraviolet photons and observe photoemission intensity oscillation ...

[Phys. Rev. B 97, 121107(R)] Published Tue Mar 13, 2018

]]>Quantum gas microscopes are a promising tool to study interacting quantum many-body systems and bridge the gap between theoretical models and real materials. One of the most powerful experimental methods in solids is angle-resolved photoemission spectroscopy (ARPES), which measures the single-particle spectral function. The authors propose a measurement scheme to experimentally access the momentum- and energy-resolved spectral function in a quantum gas microscope. As an example for possible applications, the spectrum of a single hole excitation in one-dimensional $t$-$J$ models is calculated and analyzed. A sharp asymmetry in the distribution of spectral weight, reminiscent of the Fermi arcs observed in the pseudogap phase of cuprates, appears in the case of an isotropic Heisenberg spin chain.

[Phys. Rev. B 97, 125117] Published Tue Mar 13, 2018

]]>The presence of the quantum anomalous Hall effect in a V-doped topological insulator (TI) has not yet been understood from band-structure studies. Here, we demonstrate the importance of including the correlation effect in density-functional-theory (DFT) calculations, in the format as simple as the H...

[Phys. Rev. B 97, 125118] Published Tue Mar 13, 2018

]]>The Dirac surface states of topological insulators offer a unique possibility for creating spin polarized charge currents due to the spin-momentum locking. Here we demonstrate that the control over the bulk and surface contribution is crucial to maximize the charge-to-spin conversion efficiency. We ...

[Phys. Rev. B 97, 125414] Published Tue Mar 13, 2018

]]>We investigate the dynamics of a two-dimensional electron gas (2DEG) under circular polarized microwave radiation in the presence of dilute localized impurities. Inspired by recent developments on Floquet topological insulators we obtain the Floquet wave functions of this system which allow us to pr...

[Phys. Rev. B 97, 125415] Published Tue Mar 13, 2018

]]>The magnetic phase diagram of ${\mathrm{CuCrO}}_{2}$ was studied with an alternative method of simultaneous Cu NMR and electric polarization techniques with the primary goal of demonstrating that, regardless of cooling history of the sample, the magnetic phase with specific helmet-shaped NMR spectra associated with...

[Phys. Rev. B 97, 094409] Published Mon Mar 12, 2018

]]>Resonant ultrasound spectroscopy and magnetic susceptibility experiments have been used to characterize strain coupling phenomena associated with structural and magnetic properties of the shape-memory Heusler alloy series ${\mathrm{Ni}}_{50+x}{\mathrm{Mn}}_{25-x}{\mathrm{Ga}}_{25}$ ($x=0$, 2.5, 5.0, and 7.5). All samples exhibit a martensitic t...

[Phys. Rev. B 97, 094410] Published Mon Mar 12, 2018

]]>The superconductivity in the rare-earth transition-metal ternary borides $R{\mathrm{RuB}}_{2}$ (where $R=\text{Lu}$ and Y) has been investigated using muon-spin rotation and relaxation. Measurements made in zero field suggest that time-reversal symmetry is preserved upon entering the superconducting state in both materials;...

[Phys. Rev. B 97, 094506] Published Mon Mar 12, 2018

]]>[Phys. Rev. B 97, 099901] Published Mon Mar 12, 2018

]]>In metallic ferromagnets, the interaction between local magnetic moments and conduction electrons renormalizes parameters of the Landau-Lifshitz-Gilbert equation, such as the gyromagnetic ratio and the Gilbert damping, and makes them dependent on the magnetic configurations. Although the effects of ...

[Phys. Rev. B 97, 100402(R)] Published Mon Mar 12, 2018

]]>We report measurements of the third order, ${\chi}_{3}$, and fifth order, ${\chi}_{5}$, susceptibilities in an itinerant oxide metamagnet, ${\mathrm{Sr}}_{3}{\mathrm{Ru}}_{2}{\mathrm{O}}_{7}$, for magnetic fields both parallel and perpendicular to the $c$ axis. These susceptibilities exhibit maxima in their temperature dependence such that ${T}_{1}\approx 2{T}_{3}\approx 4{T}_{5}$ where ${T}_{i}$ is t...

[Phys. Rev. B 97, 100403(R)] Published Mon Mar 12, 2018

]]>We report the synthesis and characterization of the novel silicide LaFeSiH displaying superconductivity with onset at 11 K. We find that this pnictogen-free compound is isostructural to LaFeAsO, with a similar low-temperature tetragonal to orthorhombic distortion. Using density functional theory we ...

[Phys. Rev. B 97, 100504(R)] Published Mon Mar 12, 2018

]]>We have investigated the superconducting state of the noncentrosymmetric superconductor ${\mathrm{Re}}_{6}\mathrm{Ti}$ (${T}_{c}=6.0$ K) using a muon-spin rotation/relaxation technique. The zero-field muon experiment shows the presence of spontaneous magnetic fields in the superconducting state, indicating time-reversal symmetry b...

[Phys. Rev. B 97, 100505(R)] Published Mon Mar 12, 2018

]]>It is well known that plastic deformation is a highly nonlinear dissipative irreversible phenomenon of considerable complexity. As a consequence, little progress has been made in modeling some well-known size-dependent properties of plastic deformation, for instance, calculating hardness as a functi...

[Phys. Rev. B 97, 104103] Published Mon Mar 12, 2018

]]>Quantum anomalous Hall insulator/superconductor heterostructures emerged as a competitive platform to realize topological superconductors with chiral Majorana edge states as shown in recent experiments [He *et al.* Science **357**, 294 (2017)]. However, chiral Majorana modes, being extended, cannot be us...

[Phys. Rev. B 97, 104504] Published Mon Mar 12, 2018

]]>Unraveling the nature of the doping-induced transition between a Mott insulator and a weakly correlated metal is crucial to understanding novel emergent phases in strongly correlated materials. For this purpose, we study the evolution of spectral properties upon doping Mott insulating states by util...

[Phys. Rev. B 97, 115120] Published Mon Mar 12, 2018

]]>An insulating state in graphite, which appears in a strong magnetic field around 30 T, may have its origin in an exotic density-wave state - a valley-density wave state. Experimental verification, however, has been a challenging problem. By reducing the thickness of graphite, the authors demonstrate that this insulator state becomes unstable. This thickness dependence implies evolution of the ordered state along the out-of-plane direction. The phase transition lines of each thickness can be qualitatively reproduced by the density-wave model. This thinning approach, free from introducing defects or carriers, will help understand the entire phase diagram of graphite.

[Phys. Rev. B 97, 115122] Published Mon Mar 12, 2018

]]>We develop a theory for the pseudorelativistic fractional quantum Hall effect in graphene, which is based on a multicomponent Abelian Chern-Simons theory in the fermionic functional integral approach. Calculations are performed in the Keldysh formalism, directly giving access to real-time correlatio...

[Phys. Rev. B 97, 115123] Published Mon Mar 12, 2018

]]>The interplay between the Kondo effect, indirect magnetic interaction, and geometrical frustration is studied in the Kondo lattice on the one-dimensional zigzag ladder. Using the density-matrix renormalization group, the ground-state and various short- and long-range spin- and density-correlation fu...

[Phys. Rev. B 97, 115124] Published Mon Mar 12, 2018

]]>We theoretically study the three-dimensional topological semimetals with nodal surfaces protected by crystalline symmetries. Different from the well-known nodal-point and nodal-line semimetals, in these materials, the conduction and valence bands cross on closed nodal surfaces in the Brillouin zone....

[Phys. Rev. B 97, 115125] Published Mon Mar 12, 2018

]]>We theoretically investigate topological properties of the one-dimensional superlattice anyon-Hubbard model, which can be mapped to a superlattice bose-Hubbard model with an occupation-dependent phase factor by fractional Jordan-Wigner transformation. The topological anyon-Mott insulator is identifi...

[Phys. Rev. B 97, 115126] Published Mon Mar 12, 2018

]]>The dynamical Jahn-Teller effect of ${\mathrm{C}}_{60}^{n-}$ anions ($n=1$–5) is studied using the numerical diagonalization of the linear ${p}^{n}\otimes 8d$ Jahn-Teller Hamiltonian with the currently established coupling parameters. It is found that in all anions the Jahn-Teller effect stabilizes the low-spin states, resulting in t...

[Phys. Rev. B 97, 115412] Published Mon Mar 12, 2018

]]>The complete set of Maxwell's and hydrodynamic equations for the chiral electrons in Weyl semimetals is presented. The formulation of the Euler equation takes into account the explicit breaking of the Galilean invariance by the ion lattice. It is shown that the Chern-Simons (or Bardeen-Zumino) contr...

[Phys. Rev. B 97, 121105(R)] Published Mon Mar 12, 2018

]]>We find a series of topological phase transitions of increasing order, beyond the more standard second-order phase transition in a one-dimensional topological superconductor. The jumps in the order of the transitions depend on the range of the pairing interaction, which is parametrized by an algebra...

[Phys. Rev. B 97, 121106(R)] Published Mon Mar 12, 2018

]]>Optical manipulation of charge on the nanoscale is of fundamental importance to an array of proposed technologies from selective photocatalysis to nanophotonics. Open plasmonic systems where collective electron oscillations release energy and charge to their environments offer a potential means to t...

[Phys. Rev. B 97, 121403(R)] Published Mon Mar 12, 2018

]]>A bosonic topological transition (BTT) is a quantum critical point between the bosonic symmetry-protected topological phase and the trivial phase. In this work, we investigate such a transition in a (2+1)-dimensional lattice model with the maximal microscopic symmetry: an internal $\mathrm{SO}\left(4\right)$ symmetry. We...

[Phys. Rev. B 97, 125112] Published Mon Mar 12, 2018

]]>We investigate the effect of long-range Coulomb interaction on the quasiparticle properties and the dielectric function of clean three-dimensional Weyl semimetals at zero temperature using a functional renormalization group (FRG) approach. The Coulomb interaction is represented via a bosonic Hubbard...

[Phys. Rev. B 97, 125113] Published Mon Mar 12, 2018

]]>Recent years have seen the development of two types of nonlocal extensions to the single-site dynamical mean field theory. On one hand, cluster approximations, such as the dynamical cluster approximation, recover short-range momentum-dependent correlations nonperturbatively. On the other hand, diagr...

[Phys. Rev. B 97, 125114] Published Mon Mar 12, 2018

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