Simultaneous time-and-space resolved reflectivity and interferometric measurements over a temporal span of 300 ps have been performed in fused silica and sapphire samples excited with 800 nm, 120 fs laser pulses at energies slightly and well above the ablation threshold. The experimental results hav...

[Phys. Rev. B 95, 214114] Published Tue Jun 27, 2017

]]>We used Brillouin light scattering spectroscopy to independently determine the in-plane magnetocrystalline anisotropy and the Dzyaloshinskii-Moriya interaction (DMI) in out-of-plane magnetized Au/Co/W(110). We found that the DMI strength is 2–3 times larger along the bcc$\left[\overline{1}10\right]$ than along the bcc[001...

[Phys. Rev. B 95, 214422] Published Tue Jun 27, 2017

]]>We investigate the temperature-dependent microwave absorption spectrum of an yttrium iron garnet sphere as a function of temperature (5 to $300\phantom{\rule{4pt}{0ex}}\mathrm{K}$) and frequency (3 to $43.5\phantom{\rule{4pt}{0ex}}\mathrm{GHz}$). At temperatures above $100\phantom{\rule{4pt}{0ex}}\mathrm{K}$, the magnetic resonance linewidth increases linearly with temperature and shows a Gilbert-like lin...

[Phys. Rev. B 95, 214423] Published Tue Jun 27, 2017

]]>The authors demonstrate a novel ultrahigh-resolution, minimally invasive technique for the detection of the domain-wall position within magnetic nanostructures. Based on the anomalous Nernst effect, the technique is suitable for a wide range of spintronic nanodevices implementing perpendicular-anisotropy materials. A thermal gradient generated on-chip is used to drive charge carriers, which are in turn deflected by the sample’s magnetization. Domain-wall positions within the device can be monitored with a resolution of 20 nm by measurement of the resulting Nernst voltages.

[Phys. Rev. B 95, 220410(R)] Published Tue Jun 27, 2017

]]>We describe the nonlocal effective properties of a two-dimensional dissipative phononic crystal made by periodic arrays of rigid and motionless cylinders embedded in a viscothermal fluid such as air. The description is based on a nonlocal theory of sound propagation in stationary random fluid/rigid ...

[Phys. Rev. B 95, 224304] Published Tue Jun 27, 2017

]]>The rich physics associated with magnetism often centers around directional effects. Here we demonstrate how spin-transfer torques in general result in unidirectional ferromagnetic resonance dynamics upon field reversal. The unidirectionality is a direct consequence of both field-like and damping-li...

[Phys. Rev. B 95, 224431] Published Tue Jun 27, 2017

]]>The electronic structure of ${\mathrm{Pr}}_{1-x}{\mathrm{Ca}}_{x}{\mathrm{MnO}}_{3}$ has been investigated using a combination of first-principles calculations, x-ray photoelectron spectroscopy (XPS), x-ray absorption spectroscopy (XAS), electron-energy loss spectroscopy (EELS), and optical absorption. The full range of compositions, $x=0,1/2,\mathrm{...}$

[Phys. Rev. B 95, 235150] Published Tue Jun 27, 2017

]]>Electrons in periodic potentials exhibit oscillatory motion in the presence of an electric field. Such oscillations are known as Bloch oscillations. In this article we theoretically investigate the emergence of Bloch oscillations for systems where the electric field is confined to a finite region, l...

[Phys. Rev. B 95, 235433] Published Tue Jun 27, 2017

]]>By using density-functional theory and many-body perturbation theory based first-principles calculations, we have systematically investigated the electronic and optical properties of monolayer group-IV monochalcogenides $MX$ ($M=\mathrm{Ge},\phantom{\rule{4pt}{0ex}}\mathrm{Sn}$; $X=\mathrm{S},\phantom{\rule{4pt}{0ex}}\mathrm{Se},\phantom{\rule{4pt}{0ex}}\mathrm{Te}$). All $MX$ monolayers are predicted to be indirect gap semi...

[Phys. Rev. B 95, 235434] Published Tue Jun 27, 2017

]]>[Phys. Rev. B 95, 239907] Published Tue Jun 27, 2017

]]>We study anisotropies of the helicity modulus, excitation spectrum, sound velocity, and angle-resolved luminescence spectrum in a two-dimensional system of interacting excitons in a periodic potential. Analytical expressions for anisotropic corrections to the quantities characterizing superfluidity ...

[Phys. Rev. B 95, 245430] Published Tue Jun 27, 2017

]]>Deformations of single-wall carbon nanotubes are investigated within the tight-binding model with deformation-dependent hopping energies. We show that the nanotubes tend to twist and shrink spontaneously at zero temperature. The explicit values of the deformation parameters are computed for a wide r...

[Phys. Rev. B 95, 245431] Published Tue Jun 27, 2017

]]>We study the thermoelectric properties and heat-to-work conversion performance of an interacting, multilevel quantum dot (QD) weakly coupled to electronic reservoirs. We focus on the sequential tunneling regime. The dynamics of the charge in the QD is studied by means of master equations for the pro...

[Phys. Rev. B 95, 245432] Published Tue Jun 27, 2017

]]>This paper presents an extensive study of the structural, magnetic, and thermodynamic properties of the heterometallic ludwigite ${\mathrm{Co}}_{4.76}{\mathrm{Al}}_{1.24}{\left({\mathrm{O}}_{2}{\mathrm{BO}}_{3}\right)}_{2}$. This material orders ferrimagnetically at 57 K. Despite the fact that, in ${\mathrm{Co}}_{4.76}{\mathrm{Al}}_{1.24}{\left({\mathrm{O}}_{2}{\mathrm{BO}}_{3}\right)}_{2}$, one quarter of the Co ions of the parent compound ${\mathrm{Co}}_{3}{\mathrm{...}}_{}$

[Phys. Rev. B 95, 214419] Published Mon Jun 26, 2017

]]>We present a mean-field theory describing the influence of long-range dipolar forces on the temperature transition from the paramagnetic to ordered phases in frustrated Heisenberg spiral magnets. It is shown that the dipolar interaction produces a cascade of first- and second-order phase transitions...

[Phys. Rev. B 95, 214420] Published Mon Jun 26, 2017

]]>The longitudinal spin Seebeck effect (LSSE) consists in the generation of a spin current parallel to a temperature gradient in a magnetic material. The LSSE has only been measured unequivocally in magnetic insulators because in metallic films it is contaminated by the anomalous Nernst effect (ANE). ...

[Phys. Rev. B 95, 214421] Published Mon Jun 26, 2017

]]>We consider the situation when a femtosecond laser pulse creates a hot electron state in a half-metallic ferromagnet (e.g., ferromagnetic semiconductor) on a picosecond time scale but does not act directly on the localized spin system. We show that the energy and magnetic moment transfer from hot it...

[Phys. Rev. B 95, 220409(R)] Published Mon Jun 26, 2017

]]>The magnetic interactions between rare-earth and Fe ions in hexagonal rare-earth ferrites $\left(h\text{\u2212}R{\mathrm{FeO}}_{3}\right)$, may amplify the weak ferromagnetic moment on Fe, making these materials more appealing as multiferroics. To elucidate the interaction strength between the rare-earth and Fe ions as well as the magnet...

[Phys. Rev. B 95, 224428] Published Mon Jun 26, 2017

]]>The low energy magnetic excitations spectra of the pristine and doped quasi-one-dimensional spin chains cuprates $\mathrm{SrCu}{\mathrm{O}}_{2}$ have been investigated by inelastic neutron scattering. The momentum-integrated magnetic dynamical structure factor yields a constant integrated intensity with regard to energy in ...

[Phys. Rev. B 95, 224429] Published Mon Jun 26, 2017

]]>Spin current plays a central role in spintronics. In particular, finding more efficient ways to generate spin current has been an important issue and has been studied actively. For example, representative methods of spin-current generation include spin-polarized current injections from ferromagnetic...

[Phys. Rev. B 95, 224430] Published Mon Jun 26, 2017

]]>Three-dimensional quantum electrodynamics exhibits a number of interesting properties, such as dynamical chiral symmetry breaking, weak confinement, and non-Fermi-liquid behavior, and also has wide applications in condensed-matter physics. We study the effects of random potentials, which exist in al...

[Phys. Rev. B 95, 235144] Published Mon Jun 26, 2017

]]>Metallic phases have been observed in several disordered two-dimensional (2D) systems, including thin films near superconductor-insulator transitions and quantum Hall systems near plateau transitions. The existence of 2D metallic phases at zero temperature generally requires an interplay of disorder...

[Phys. Rev. B 95, 235145] Published Mon Jun 26, 2017

]]>Quantum electrodynamics in 2+1 dimensions (${\mathrm{QED}}_{3}$) is a strongly coupled conformal field theory (CFT) of a U(1) gauge field coupled to $2N$ two-component massless fermions. The $N=2$ CFT has been proposed as a ground state of the spin-1/2 kagome Heisenberg antiferromagnet. We study ${\mathrm{QED}}_{3}$ in the presence of...

[Phys. Rev. B 95, 235146] Published Mon Jun 26, 2017

]]>The ferromagnetic superconductor URhGe has been investigated by high field magnetic circular dichroism (XMCD) at the U ${M}_{4,5}$, Rh ${L}_{2,3}$, and Ge $K$ edges at 2.1 K and at applied fields up to 17 T. The XMCD performed at the ${M}_{4,5}$ absorption edges allows us to determine the spectroscopic branching ratio and...

[Phys. Rev. B 95, 235147] Published Mon Jun 26, 2017

]]>Raman scattering in the three-dimensional Dirac semimetal $\mathrm{C}{\mathrm{d}}_{3}\mathrm{A}{\mathrm{s}}_{2}$ shows an intricate interplay of electronic and phonon degrees of freedom. We observe resonant phonon scattering due to interband transitions, an anomalous anharmonicity of phonon frequency and intensity, as well as quasielastic $(E\sim 0)$ e...

[Phys. Rev. B 95, 235148] Published Mon Jun 26, 2017

]]>We report a detailed study of the transport properties of a $\beta -\mathrm{B}{\mathrm{i}}_{4}{\mathrm{I}}_{4}$ quasi-one-dimensional topological insulator. Electrical resistivity, thermoelectric power, thermal conductivity, and Hall coefficient measurements are consistent with the possible appearance of a charge-density-wave order at low tem...

[Phys. Rev. B 95, 235149] Published Mon Jun 26, 2017

]]>We consider theoretically staggered honeycomb lattices for photons which can be viewed as photonic analogs of transitional metal dichalcogenide (TMD) monolayers. We propose a simple realization of a photonic quantum valley Hall effect (QVHE) at the interface between two inverted lattices. This resul...

[Phys. Rev. B 95, 235431] Published Mon Jun 26, 2017

]]>We investigate Klein tunneling for the $\alpha \text{\u2212}{T}_{3}$ model, which interpolates between graphene and the dice lattice via parameter $\alpha $. We study transmission across two types of electrostatic interfaces: sharp potential steps and sharp potential barriers. We find both interfaces to be perfectly transparent for...

[Phys. Rev. B 95, 235432] Published Mon Jun 26, 2017

]]>[Phys. Rev. B 95, 239906] Published Mon Jun 26, 2017

]]>Recently discovered Dirac and Weyl semimetals display unusual magnetoresistance phenomena, including a large, nonsaturating, linear transverse magnetoresistance and a negative longitudinal magnetoresistance. The latter is often considered as evidence of fermions that have a defined chirality. Classi...

[Phys. Rev. B 95, 241113(R)] Published Mon Jun 26, 2017

]]>Excitation of a semiconductor quantum dot with a chirped laser pulse allows excitons to be created by rapid adiabatic passage. In quantum dots this process can be greatly hindered by the coupling to phonons. Here we add a high chirp rate to ultrashort laser pulses and use these pulses to excite a si...

[Phys. Rev. B 95, 241306(R)] Published Mon Jun 26, 2017

]]>The spin noise in singly charged self-assembled quantum dots is studied theoretically and experimentally under the influence of a perturbation, provided by additional photoexcited charge carriers. The theoretical description takes into account generation and relaxation of charge carriers in the quan...

[Phys. Rev. B 95, 241408(R)] Published Mon Jun 26, 2017

]]>Transport measurements on the two-dimensional electron system in $\mathrm{A}{\mathrm{l}}_{2}{\mathrm{O}}_{3}\text{/}\mathrm{SrTi}{\mathrm{O}}_{3}$ heterostructures indicate significant noncrystalline anisotropic behavior below $T\approx 30\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. Lattice dislocations in $\mathrm{SrTi}{\mathrm{O}}_{3}$ and interfacial steps are suggested to be the main sources for electronic anisotropy. Anisotropic defect...

[Phys. Rev. B 95, 245132] Published Mon Jun 26, 2017

]]>The SU(4)-SU(2) crossover, driven by an external magnetic field $h$, is analyzed in a capacitively coupled double quantum dot device connected to independent leads. As one continuously charges the dots from empty to quarter filled, by varying the gate potential ${V}_{g}$, the crossover starts when the magnit...

[Phys. Rev. B 95, 245133] Published Mon Jun 26, 2017

]]>We show that a simple artificial neural network trained on entanglement spectra of individual states of a many-body quantum system can be used to determine the transition between a many-body localized and a thermalizing regime. Specifically, we study the Heisenberg spin-1/2 chain in a random externa...

[Phys. Rev. B 95, 245134] Published Mon Jun 26, 2017

]]>In underdoped ${\mathrm{YBa}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{6+x}$, there is evidence of a small Fermi surface pocket subject to substantial mass enhancement in the doping regime $0.12<p<0.16$. This mass enhancement may vary substantially over the Fermi surface, due to “hot spot” or other relevant physics. We therefore examine the magn...

[Phys. Rev. B 95, 245135] Published Mon Jun 26, 2017

]]>We theoretically study the effect of the Berry curvature on the transport properties of Weyl semimetals using a semiclassical Boltzmann transport theory, which results in nonlinear optical responses. In the adiabatic process, the Berry curvature, which involves the time derivative of the Bloch state...

[Phys. Rev. B 95, 245211] Published Mon Jun 26, 2017

]]>We report an efficient method to observe single photon emissions in monolayer $\mathrm{WS}{\mathrm{e}}_{2}$ by applying hydrostatic pressure. The photoluminescence peaks of typical two-dimensional excitons show a nearly identical pressure-induced blueshift, whereas the energy of pressure-induced discrete emission lines (qua...

[Phys. Rev. B 95, 245313] Published Mon Jun 26, 2017

]]>We model quantum Hall skyrmions in graphene monolayer at quarter filling by a theory of ${\mathrm{CP}}^{3}$ fields and study the energy minimizing skyrmions in the presence of valley pseudospin anisotropy and Zeeman coupling. We present a diagram of all types of skyrmions in a wide range of the anisotropy parameter...

[Phys. Rev. B 95, 245428] Published Mon Jun 26, 2017

]]>We measure subnanometer displacements of thin samples vibrated by piezotransducer. Samples contain ${}^{57}\mathrm{Fe}$ nuclei, which are exposed to 14.4-keV $\gamma $ radiation. Vibration produces sidebands from a single absorption line of the sample. The sideband intensities depend on the vibration amplitude and its dist...

[Phys. Rev. B 95, 245429] Published Mon Jun 26, 2017

]]>Magnetic skyrmions are topological spin configurations in materials with chiral Dzyaloshinskii-Moriya interaction (DMI), that are potentially useful for storing or processing information. To date, DMI has been found in few bulk materials, but can also be induced in atomically thin magnetic films in ...

[Phys. Rev. B 95, 214418] Published Fri Jun 23, 2017

]]>The interpretation of scanning tunneling microscopy (STM) data on poorly metallic materials is challenging: one needs to take into account the partial penetration of the electric field into the sample, the so-called tip-induced band bending (TIBB). This effect is well known from STM experiments on semiconductors, but rarely discussed for correlated-electron systems. The authors find that in the lightly doped Mott insulator (Sr${}_{1-x}$La${}_{x}$)${}_{2}$IrO${}_{4}$, TIBB is at the root of apparent discrepancies in the gap values measured by photoemission, optical measurements, and STM. They develop a model to extract the intrinsic Mott gap of the system, leading to agreement with results from other techniques.

[Phys. Rev. B 95, 235141] Published Fri Jun 23, 2017

]]>We study the time evolution of a one-dimensional interacting fermion system described by the Luttinger model starting from a nonequilibrium state defined by a smooth temperature profile $T\left(x\right)$. As a specific example we consider the case when $T\left(x\right)$ is equal to ${T}_{L}$ $\left({T}_{R}\right)$ far to the left (right). Using a se...

[Phys. Rev. B 95, 235142] Published Fri Jun 23, 2017

]]>Topological insulators and superconductors are characterized by their gapless boundary modes. In this paper, we develop a recursive approach to the boundary Green function, which encodes this nontrivial boundary physics. Our approach describes the various topologically trivial and nontrivial phases ...

[Phys. Rev. B 95, 235143] Published Fri Jun 23, 2017

]]>Exciton transport in nanomaterials is sensitive to fluctuations in the confinement potential that are intrinsic to heterogeneous solid-state systems. Redistribution of exciton population manifests as spectral diffusion in which the exciton energy shifts. It is generally assumed that increase or decr...

[Phys. Rev. B 95, 235307] Published Fri Jun 23, 2017

]]>We address the electronic structure of the surface states of topological-insulator thin films with embedded local nonmagnetic and magnetic impurities. Using the $T$-matrix expansion of the real-space Green's function, we derive the local density of electron states and corresponding spin-resolved densi...

[Phys. Rev. B 95, 235429] Published Fri Jun 23, 2017

]]>An intense laser field in the high-frequency regime drives carriers in graphene nanoribbons (GNRs) out of equilibrium and creates topologically protected edge states. Using Floquet theory on driven GNRs, we calculate the time evolution of local excitations of these edge states and show that they exh...

[Phys. Rev. B 95, 235430] Published Fri Jun 23, 2017

]]>Electrical currents in a magnetic-insulator/heavy-metal heterostructure can induce two simultaneous effects, namely, spin Hall magnetoresistance (SMR) on the heavy-metal side and spin-orbit torques (SOTs) on the magnetic-insulator side. Within the framework of a pure spin current model based on the ...

[Phys. Rev. B 95, 241305(R)] Published Fri Jun 23, 2017

]]>In electronic systems with long-range Coulomb interaction, the nonlocal Fock-exchange term has a band-widening effect. While this effect is included in combined many-body perturbation theory and dynamical mean field theory (DMFT) schemes, it is not taken into account in standard extended DMFT (EDMFT...

[Phys. Rev. B 95, 245130] Published Fri Jun 23, 2017

]]>We report on a combined soft x-ray absorption and magnetic circular dichroism (XMCD) study at the Co-${L}_{3,2}$ edge on the hybrid $3d/5d$ solid state oxide ${\mathrm{Sr}}_{2}{\mathrm{Co}}_{0.5}{\mathrm{Ir}}_{0.5}{\mathrm{O}}_{4}$ with ${\mathrm{K}}_{2}{\mathrm{NiF}}_{4}$ structure. Our data indicate unambiguously a pure high spin state $(S=2)$ for the ${\mathrm{Co}}^{3+}$ ($3{d}^{6}$) ions with a significant unquench...

[Phys. Rev. B 95, 245131] Published Fri Jun 23, 2017

]]>We present a conceptually simple method for treating electron-phonon scattering and phonon limited mobilities. By combining Green's function based transport calculations and molecular dynamics, we obtain a temperature dependent transmission from which we evaluate the mobility. We validate our approa...

[Phys. Rev. B 95, 245210] Published Fri Jun 23, 2017

]]>We study driven-dissipative Bose-Einstein condensates in a two-mode Josephson system, such as a double-well potential, with asymmetrical pumping. We investigate nonlinear effects on the condensate populations and mode transitions. The generalized Gross-Pitaevskii equations are modified in order to t...

[Phys. Rev. B 95, 245312] Published Fri Jun 23, 2017

]]>We show that in $AB$ stacked bilayer graphene low-energy excitations around the semimetallic points are described by massless, four-dimensional Dirac fermions. There is an effective reconstruction of the four-dimensional spacetime, including in particular the dimension perpendicular to the sheet, that...

[Phys. Rev. B 95, 245426] Published Fri Jun 23, 2017

]]>We study the incomplete oxidation of graphene or reduction of graphene oxide for hydroxyl and epoxy oxidant groups. While in wet oxidation hydroxyl groups are favorable, in a drier environment an oxygen atom can bridge two neighboring carbon atoms. We model composition variations and structural diso...

[Phys. Rev. B 95, 245427] Published Fri Jun 23, 2017

]]>In this work we discuss the existence of time-translation symmetry breaking in a kicked infinite-range-interacting clean spin system described by the Lipkin-Meshkov-Glick model. This Floquet time crystal is robust under perturbations of the kicking protocol, its existence being intimately linked to ...

[Phys. Rev. B 95, 214307] Published Thu Jun 22, 2017

]]>Magnetic moments in an ultrathin Pt film on a ferrimagnetic insulator ${\mathrm{Y}}_{3}{\mathrm{Fe}}_{5}{\mathrm{O}}_{12}$ (YIG) have been investigated at high magnetic fields and low temperatures by means of x-ray magnetic circular dichroism (XMCD). We observed an XMCD signal due to the magnetic moments in a Pt film at the Pt ${L}_{3}$ and ${L}_{2}$ edges...

[Phys. Rev. B 95, 214416] Published Thu Jun 22, 2017

]]>Temperature-dependent magnetic experiments such as pump-probe measurements generated by a pulsed laser have become a crucial technique for switching the magnetization in the picosecond time scale. Apart from having practical implications on the magnetic storage technology, the research field of ultr...

[Phys. Rev. B 95, 214417] Published Thu Jun 22, 2017

]]>Over the past years a lot of theoretical and experimental effort has been made to find states with broken time-reversal symmetry (BTRS) in multiband superconductors. In particular, it was proposed theoretically that in the ${\mathrm{Ba}}_{1-x}{\mathrm{K}}_{x}{\mathrm{Fe}}_{2}{\mathrm{As}}_{2}$ system either an $s+is$ or an $s+id$ BTRS state may exist at high d...

[Phys. Rev. B 95, 214511] Published Thu Jun 22, 2017

]]>Temperature-dependent reflectivity measurements in the frequency range 75–8000 ${\mathrm{cm}}^{-1}$ were performed on ${\mathrm{BaFe}}_{2}{\left({\mathrm{As}}_{0.77}{\mathrm{P}}_{0.23}\right)}_{2}$ single crystals under pressure up to $\sim 5\phantom{\rule{0.16em}{0ex}}\mathrm{GPa}$. The obtained optical conductivity spectra have been analyzed to extract the electron-boson spectral density ${\alpha}^{2}F\left(\mathrm{\Omega}\right)$. A sharp resonance ...

[Phys. Rev. B 95, 214512] Published Thu Jun 22, 2017

]]>[Phys. Rev. B 95, 219905] Published Thu Jun 22, 2017

]]>Taking pure Mg, Mg-Al, and Mg-Zn as prototypes, the effects of strain on the stacking fault energies (SFEs), dislocation core structure, and Peierls stress were systematically investigated by means of density functional theory and the semidiscrete variational Peierls-Nabarro model. Our results sugge...

[Phys. Rev. B 95, 224106] Published Thu Jun 22, 2017

]]>A combination of *in situ* volumetric measurements, Raman spectroscopy, x-ray diffraction, differential thermal analysis, and transmission electron microscopy was used to investigate the crystalline-amorphous transformation of zirconium tungstate at high pressure and room temperature. Zirconium tungst...

[Phys. Rev. B 95, 224205] Published Thu Jun 22, 2017

]]>A systematic investigation of the magnetization reversal and the dynamic behaviors of uncoupled ${\mathrm{Ni}}_{80}{\mathrm{Fe}}_{20}$ nanowires (NWs) with artificial continuous width modulation is presented. In contrast with the single resonance mode observed in the homogeneous NWs from the broadband ferromagnetic resonance spe...

[Phys. Rev. B 95, 224426] Published Thu Jun 22, 2017

]]>${}^{13}\mathrm{C}$ nuclear magnetic resonance measurements were performed for a single-component molecular material Zn(tmdt)${}_{2}$, in which tmdt's form an arrangement similar to the so-called $\kappa $-type molecular packing in quasi-two-dimensional Mott insulators and superconductors. A detailed analysis of the powder spectr...

[Phys. Rev. B 95, 224427] Published Thu Jun 22, 2017

]]>Motivated by recent thermal conductivity measurements in the superconductor ${\mathrm{CeCoIn}}_{5}$, we theoretically examine a possible staggered spin-triplet superconducting order to be induced by the coupled spin-density-wave (SDW) and $d$-wave superconducting (SC) orders in the high-field and low-temperature (HFL...

[Phys. Rev. B 95, 224513] Published Thu Jun 22, 2017

]]>Electromagnetic scattering from moving bodies, being an inherently time-dependent phenomenon, gives rise to a generation of new frequencies, which can be used to characterize the motion. Whereas an ordinary motion along a linear path produces a constant Doppler shift, an accelerated scatterer can ge...

[Phys. Rev. B 95, 235139] Published Thu Jun 22, 2017

]]>Large classes of matter have been systematized before by using a pair of groups to classify all spontaneous symmetry breaking phases or by using a pair of groups plus projective representations to classify all gapped quantum phases of one-dimensional boson and fermion systems with various symmetries. In this paper, the authors go beyond this and use a pair of groups plus three braided fusion categories and a chiral central charge in order to classify gapped quantum phases of two-dimensional boson and fermion systems with various finite symmetries. This allows, among other things, to generate many group tables of two-dimensional gapped phases.

[Phys. Rev. B 95, 235140] Published Thu Jun 22, 2017

]]>[Phys. Rev. B 95, 239905] Published Thu Jun 22, 2017

]]>The Kitaev quantum spin liquid on a honeycomb lattice has received much interest in magnetism, mainly because of the possibility of emergence of novel excitations called Majorana quasiparticles. The quest is under way to realize this exotic state in actual materials. One of the promising materials is the layered honeycomb material RuCl${}_{3}$, for which the signatures of the Majorana quasiparticles have been reported. Here, the authors investigate the magnetic thermal conductivity of RuCl${}_{3}$ along with bulk thermodynamic measurements. They find that in the temperature range on the order of the Kitaev-coupling strength anomalous heat conduction takes place, which correlates with the growth of the magnetic specific heat. The result is consistent with the propagation of magnetic excitations, likely itinerant Majorana quasiparticles, driven by Kitaev coupling.

[Phys. Rev. B 95, 241112(R)] Published Thu Jun 22, 2017

]]>Organic light-emitting diodes convert electricity to light through the recombination of positive and negative charges. This process is fundamentally dependent on the spin of the carriers, and can therefore be influenced by a magnetic field. We show that magnetic-field-induced changes to the conductivity of a diode structure made of a conducting polymer can be resolved down to the scale of some 20 parts per billion. This extreme sensitivity to magnetic fields allows us to resolve field changes of less than 100 nanotesla, which is almost two orders of magnitude less than Earth’s magnetic field.

[Phys. Rev. B 95, 241407(R)] Published Thu Jun 22, 2017

]]>We explore the effects of asymmetry of hopping parameters between double parallel quantum dots and the leads on the conductance and a possibility of local magnetic moment formation in this system using functional renormalization group approach with the counterterm. We demonstrate a possibility of a ...

[Phys. Rev. B 95, 245129] Published Thu Jun 22, 2017

]]>In III-V semiconductors it was shown theoretically that under optical cooling the nuclear-spin polaron bound to neutral donors would form below some critical nuclear-spin temperature ${T}_{c}$ [Merkulov, Phys. Solid State **40**, 930 (1998)]. The predicted critical behavior is a direct consequence of the use o...

[Phys. Rev. B 95, 245209] Published Thu Jun 22, 2017

]]>Emergence of a classical particle trajectory concept from the full quantum description is a key feature of quantum mechanics. Recent progress of solid-state on-demand sources has brought single-electron manipulation into the quantum regime; however, the quantum-to-classical crossover remains unprobe...

[Phys. Rev. B 95, 245424] Published Thu Jun 22, 2017

]]>The propagation of surface waves supported by a finite array of slots perforated on a zero thickness perfect electrically conducting screen is studied both experimentally and theoretically. To generate numerical results, the integral equation satisfied by the electric field in the slots is efficient...

[Phys. Rev. B 95, 245425] Published Thu Jun 22, 2017

]]>The coherent high-fidelity generation of nuclear spins in long-lived singlet states, which may find application as quantum memory or sensor, represents a considerable experimental challenge. Here, we propose a dissipative scheme that achieves the preparation of pairs of nuclear spins in long-lived s...

[Phys. Rev. B 95, 224105] Published Wed Jun 21, 2017

]]>In topological semimetals the Dirac points can form zero-dimensional and one-dimensional manifolds, as predicted for Dirac/Weyl semimetals and topological nodal line semimetals, respectively. Here, based on first-principles calculations, we predict a topological nodal line semimetal phase in the two...

[Phys. Rev. B 95, 235138] Published Wed Jun 21, 2017

]]>A team of experimentalists and theorists proposes a scalable protocol for quantum computation based on topological superconductors.

[Phys. Rev. B 95, 235305] Published Wed Jun 21, 2017

]]>The cooling of solids by optical means only using anti-Stokes emission has a long history of research and achievements. Such cooling methods have many advantages ranging from no moving parts or fluids through to operation in vacuum and may have applications to cryosurgery. However, achieving large o...

[Phys. Rev. B 95, 235306] Published Wed Jun 21, 2017

]]>We present here a generalization of the thermal discrete dipole approximation (TDDA) that allows us to describe the near-field radiative heat transfer between finite objects of arbitrary shape that exhibit magneto-optical (MO) activity. We also extend the TDDA approach to describe the thermal emissi...

[Phys. Rev. B 95, 235428] Published Wed Jun 21, 2017

]]>The ordering wave vector $\mathbf{Q}$ of a spin density wave (SDW), stabilized within the superconducting state of ${\mathrm{CeCoIn}}_{5}$ in a high magnetic field, has been shown to be hypersensitive to the direction of the field. $\mathbf{Q}$ can be switched from a nodal direction of the $d$-wave superconducting order parameter to a per...

[Phys. Rev. B 95, 241110(R)] Published Wed Jun 21, 2017

]]>Charge-density-wave (CDW) correlations feature prominently in the phase diagram of the cuprates, motivating competing theories of whether fluctuating CDW correlations aid superconductivity or whether static CDW order coexists with superconductivity in inhomogeneous or spatially modulated states. Her...

[Phys. Rev. B 95, 241111(R)] Published Wed Jun 21, 2017

]]>In this work, we develop a coupled layer construction of fracton topological orders in $d=3$ spatial dimensions. These topological phases have subextensive topological ground-state degeneracy and possess excitations whose movement is restricted in interesting ways. Our coupled layer approach is used t...

[Phys. Rev. B 95, 245126] Published Wed Jun 21, 2017

]]>Tensor network states, and in particular projected entangled pair states, play an important role in the description of strongly correlated quantum lattice systems. They do not only serve as variational states in numerical simulation methods, but also provide a framework for classifying phases of qua...

[Phys. Rev. B 95, 245127] Published Wed Jun 21, 2017

]]>We study the electric field and temperature gradient driven magnetoconductivity of a Weyl semimetal system. To analyze the responses, we utilize the kinetic equation with semiclassical equations of motion modified by the Berry curvature and orbital magnetization of the wave packet. Apart from the kn...

[Phys. Rev. B 95, 245128] Published Wed Jun 21, 2017

]]>Optically induced dynamic nuclear spin polarization (DNP) in a semiconductor quantum dot (QD) requires many cycles of excitation of spin polarized carriers and carrier recombination. As such, the radiative lifetime of the exciton containing the electron becomes one of the limiting factors of DNP. In...

[Phys. Rev. B 95, 245423] Published Wed Jun 21, 2017

]]>We study dissipation in palladium (Pd) nanomechanical resonators at low temperatures in the linear response regime. Metallic resonators have shown characteristic features of dissipation due to tunneling two-level systems (TLS). The system described here offers a unique tunability of the dissipation ...

[Phys. Rev. B 95, 214113] Published Tue Jun 20, 2017

]]>We theoretically consider the spin-wave mode- and wavelength-dependent enhancement of the Gilbert damping in magnetic insulator–normal metal bilayers due to spin pumping as well as the enhancement's relation to direct and alternating inverse spin Hall voltages in the normal metal. In the long-wavele...

[Phys. Rev. B 95, 214413] Published Tue Jun 20, 2017

]]>Thermodynamic properties and low-energy magnon excitations of $S=1$ honeycomb-layered ${\mathrm{Na}}_{3}{\mathrm{Ni}}_{2}{\mathrm{SbO}}_{6}$ have been investigated by high-resolution dilatometry, static magnetization, and high-frequency electron spin resonance studies in magnetic fields up to 16 T. At ${T}_{\mathrm{N}}$ = 16.5 K, there is a tricritical point s...

[Phys. Rev. B 95, 214414] Published Tue Jun 20, 2017

]]>The layered compound ${\mathrm{KCu}}_{3}{\mathrm{As}}_{2}{\mathrm{O}}_{7}{\left(\mathrm{O}\mathrm{D}\right)}_{3}$, comprising distorted kagome planes of $S=1/2\phantom{\rule{4pt}{0ex}}{\mathrm{Cu}}^{2+}$ ions, is a recent addition to the family of type-II multiferroics. Previous zero-field neutron diffraction work has found two helically ordered regimes in ${\mathrm{KCu}}_{3}{\mathrm{As}}_{2}{\mathrm{O}}_{7}{\left(\mathrm{O}\mathrm{D}\right)}_{3}$, each showing a distinct coupling between the...

[Phys. Rev. B 95, 214415] Published Tue Jun 20, 2017

]]>We present an *ab initio* study of Ru substitution in two different compounds, ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ and LaFeAsO, pure and F doped. Despite the many similarities among them, Ru substitution has very different effects on these compounds. By means of an unfolding technique, which allows us to trace back the electron...

[Phys. Rev. B 95, 214510] Published Tue Jun 20, 2017

]]>We theoretically demonstrate natural optical activity in disordered ensembles of nonchiral plasmonic resonators. We show that the statistical distributions of rotatory power and spatial dichroism are strongly dependent on the scattering mean free path in diffusive random media. This result is explai...

[Phys. Rev. B 95, 220201(R)] Published Tue Jun 20, 2017

]]>The real benefit of antiferromagnets is that they can enable terahertz spintronic circuits. Spin pumping is a versatile tool for generating pure spin currents and probing spin dynamics. The high antiferromagnetic resonance frequencies represent a challenge for experimental detection, but magnetic fields can reduce these resonance frequencies. The authors compute the inverse spin Hall voltages resulting from dynamical spin excitations. They suggest practical opportunities that will significantly enhance the spin pumping and inverse spin Hall voltage for the uniaxial antiferromagnets MnF${}_{2}$ and FeF${}_{2}$.

[Phys. Rev. B 95, 220408(R)] Published Tue Jun 20, 2017

]]>Multiple reverberation compression can achieve higher pressure, higher temperature, but lower entropy. It is available to provide an important validation for the elaborate and wider planetary models and simulate the inertial confinement fusion capsule implosion process. In the work, we have develope...

[Phys. Rev. B 95, 224104] Published Tue Jun 20, 2017

]]>Noncollinear and noncoplanar magnetic textures including Skyrmions and vortices act as emergent electromagnetic fields and give rise to novel electronic and transport properties. We here report a unified understanding of noncoplanar magnetic orderings emergent from the spin-charge coupling in itiner...

[Phys. Rev. B 95, 224424] Published Tue Jun 20, 2017

]]>We demonstrate a close connection between observed field-induced antiferromagnetic (AFM) order and quantum critical fluctuation (QCF) in the Zn7%-doped heavy-fermion superconductor ${\mathrm{CeCoIn}}_{5}$. Magnetization, specific heat, and electrical resistivity at low temperatures all show the presence of new fiel...

[Phys. Rev. B 95, 224425] Published Tue Jun 20, 2017

]]>We successfully synthesize single crystals of the verdazyl radical $\alpha \text{\u2212}2,3,5\text{\u2212}{\mathrm{Cl}}_{3}$-V. *Ab initio* molecular orbital calculations indicate that the two dominant antiferromagnetic interactions, ${J}_{1}$ and ${J}_{2}$ $\left(\alpha ={J}_{2}/{J}_{1}\simeq 0.56\right)$, form an $S=1/2$ distorted square lattice. We explain the magnetic properties based on the $\mathrm{...}$

[Phys. Rev. B 95, 235135] Published Tue Jun 20, 2017

]]>In strong magnetic field, the longitudinal magnetoconductivity in three-dimensional chiral materials is shown to exhibit a new type of quantum oscillations arising from the chiral magnetic effect (CME). These quantum CME oscillations are predicted to dominate over the Shubnikov–de Haas (SdH) ones in...

[Phys. Rev. B 95, 235136] Published Tue Jun 20, 2017

]]>The phenomenological textbook equations for charge and heat transport are extensively used in a number of fields ranging from semiconductor devices to thermoelectricity. We provide a rigorous derivation of transport equations by solving the Boltzmann equation in the relaxation-time approximation and...

[Phys. Rev. B 95, 235137] Published Tue Jun 20, 2017

]]>We discuss monolayer and bilayer quantum Hall systems in which each layer is a half-filled Landau level (LL) system. In the mean field approximation of the Son's formalism, there is a common pairing structure that underlines the possibilities for paired ground states in both systems. We argue that t...

[Phys. Rev. B 95, 235304] Published Tue Jun 20, 2017

]]>Magnetic moments (MMs) of electrons in topological insulator quantum dots (TI-QDs) are investigated using a model system, namely a multiorbital honeycomb lattice. Their nature and orientation with respect to the spin are studied. We show that large MMs are not specific to edge states in nontrivial g...

[Phys. Rev. B 95, 235426] Published Tue Jun 20, 2017

]]>