Coherent conversion of microwave and optical photons in the single quantum level can significantly expand our ability to process signals in various fields. Efficient up-conversion of a feeble signal in the microwave domain to the optical domain will lead to quantum-noise-limited microwave amplifiers…

[Phys. Rev. B 93, 174427] Published Fri May 27, 2016

]]>An exchange-bias (EB) effect observed in single crystal $\mathrm{ErFe}{\mathrm{O}}_{3}$ compensated ferrimagnet, exhibiting the EB field ${H}_{\mathrm{EB}}$ increasing and diverging upon approaching compensation temperature ${T}_{\mathrm{comp}}=45\phantom{\rule{0.16em}{0ex}}\mathrm{K}$, and changing sign with crossing ${T}_{\mathrm{comp}}$, is reported. The EB sign may be changed to the opposite one by vary…

[Phys. Rev. B 93, 184432] Published Fri May 27, 2016

]]>Spin crossover in the ${\mathrm{Fe}(1,10-\text{phenanthroline})}_{2}{\left(\mathrm{NCS}\right)}_{2}$ (Fephen) molecule adsorbed on ferromagnetic cobalt (001) and (111) surfaces as well as a gold (001) surface has been studied using the projector augmented wave method in conjunction with the density functional theory within the generalized gradien…

[Phys. Rev. B 93, 184433] Published Fri May 27, 2016

]]>We have demonstrated a strain-induced metal-insulator transition for weak Jahn-Teller effects in a ${t}_{2g}$ electron system of $\mathrm{S}{\mathrm{m}}_{0.5}\mathrm{C}{\mathrm{a}}_{0.5}\mathrm{Ti}{\mathrm{O}}_{3}$, which has metallic ground states in the bulk. A clear variation of electronic properties in $\mathrm{S}{\mathrm{m}}_{0.5}\mathrm{C}{\mathrm{a}}_{0.5}\mathrm{Ti}{\mathrm{O}}_{3}$ thin films was investigated as a function of epitaxial …

[Phys. Rev. B 93, 195159] Published Fri May 27, 2016

]]>We exploit topological edge states in resonant photonic crystals to attain strongly localized resonances and demonstrate lasing in these modes upon optical excitation. The use of virtually lossless topologically isolated edge states may lead to a class of thresholdless lasers operating without inver…

[Phys. Rev. B 93, 195317] Published Fri May 27, 2016

]]>Cyclic Pancharatnam-Berry (PB) and adiabatic noncyclic geometric (ANG) effects are investigated in a single electron orbital system connected to two metal contacts with externally driven chemical potential and/or temperatures. The PB contribution doesn't affect the density matrix evolution, but has …

[Phys. Rev. B 93, 195441] Published Fri May 27, 2016

]]>We demonstrate experimentally giant spatial-dispersion-induced birefringence in metamaterials. The difference between the reflection coefficients for $(1,\overline{1},0)$- and $(0,0,1)$-polarized light reflected from the $[1,1,0]$ surface of a metamaterial reaches $78\%$. The magnitude of spatial-dispersion-induced bi…

[Phys. Rev. B 93, 201115(R)] Published Fri May 27, 2016

]]>We propose an all-electrical experimental setup to detect and manipulate the amplitude of odd-frequency pairing in a double quantum dot. The odd-frequency pair amplitude is induced from the breakdown of orbital symmetry when Cooper pairs are injected in the double dot with electrons in different dot…

[Phys. Rev. B 93, 201402(R)] Published Fri May 27, 2016

]]>Obtaining highly spin-polarized currents in molecular junctions is crucial and important for nanoscale spintronics devices. Motivated by our recent symmetry-based theoretical argument for complete blocking of one spin conductance channel in model molecular junctions [A. Smogunov and Y. J. Dappe, Nan…

[Phys. Rev. B 93, 201403(R)] Published Fri May 27, 2016

]]>There has been considerable interest in topological semimetals that exhibit extreme magnetoresistance (XMR). These have included materials lacking inversion symmetry such as TaAs, as well Dirac semimetals such as ${\mathrm{Cd}}_{3}{\mathrm{As}}_{2}$. However, it was reported recently that LaSb and LaBi also exhibit XMR, even tho…

[Phys. Rev. B 93, 205152] Published Fri May 27, 2016

]]>We theoretically investigate a nanoscale mode-division multiplexing scheme based on parity-time- ($\mathcal{PT}$) symmetric coaxial plasmonic waveguides. Coaxial waveguides support paired degenerate modes corresponding to distinct orbital angular momentum states. $\mathcal{PT}$-symmetric inclusions of gain and loss break t…

[Phys. Rev. B 93, 205439] Published Fri May 27, 2016

]]>Samarium orthoferrite $\left(\mathrm{SmFe}{\mathrm{O}}_{3}\right)$ has been the subject of debate on the existence or nonexistence of ferroelectric properties. It has a high spin-reorientation transition temperature ${T}_{\mathrm{SR}}$ (480 K). Detailed synchrotron x-ray diffraction and Raman spectroscopy dielectric investigations in the 300 to 600 K…

[Phys. Rev. B 93, 174117] Published Thu May 26, 2016

]]>We study a quantum quench in a one-dimensional spinless fermion model (equivalent to the XXZ spin chain), where a magnetic flux is suddenly switched off. This quench is equivalent to imposing a pulse of electric field and therefore generates an initial particle current. This current is not a conserv…

[Phys. Rev. B 93, 174310] Published Thu May 26, 2016

]]>The excitations of the Heisenberg antiferromagnetic spin chain in zero field are known as spinons. As pairwise-created fractionalized excitations, spinons are important in the understanding of inelastic neutron scattering experiments in (quasi-)one-dimensional materials. In the present paper, we con…

[Phys. Rev. B 93, 174426] Published Thu May 26, 2016

]]>Single He nanodroplets doped with Xe atoms are studied via ultrafast coherent x-ray diffraction imaging. The diffraction images show that rotating He nanodroplets about 200 nm in diameter contain a small number of symmetrically arranged quantum vortices decorated with Xe clusters. Unexpected large d…

[Phys. Rev. B 93, 180510(R)] Published Thu May 26, 2016

]]>Superconductivity in disordered systems close to an incipient localization transition has been an area of investigation for many years, but many fundamentally important aspects are still not understood. It has been noted that in such highly disordered superconductors, anomalous spectral weight devel…

[Phys. Rev. B 93, 180511(R)] Published Thu May 26, 2016

]]>The layered honeycomb magnet $\alpha \text{\u2212}{\mathrm{Li}}_{2}{\mathrm{IrO}}_{3}$ has been theoretically proposed as a candidate to display unconventional magnetic behaviour associated with Kitaev interactions between spin-orbit entangled ${j}_{\mathrm{eff}}=1/2$ magnetic moments on a honeycomb lattice. Here we report single crystal magnetic resonant x-ray …

[Phys. Rev. B 93, 195158] Published Thu May 26, 2016

]]>We study the role of anisotropy on the transport properties of composite fermions near Landau level filling factor $\nu =1/2$ in two-dimensional holes confined to a GaAs quantum well. By applying a parallel magnetic field, we tune the composite fermion Fermi sea anisotropy and monitor the relative change…

[Phys. Rev. B 93, 195436] Published Thu May 26, 2016

]]>In a $\pi $-Josephson junction, the supercurrent's sign is reversed due to the dephasing of superconducting pairs upon their traversal of the nonsuperconducting part. 0-$\pi $ quantum transitions are extremely sensitive to electronic and magnetic correlations, providing powerful exploration tools of competing…

[Phys. Rev. B 93, 195437] Published Thu May 26, 2016

]]>We present a molecular modeling study analyzing nanometer-scale strain variations in graphene as a function of externally applied tensile strain. We consider two different mechanisms that could underlie nanometer-scale strain variations: static perturbations from lattice imperfections of an underlyi…

[Phys. Rev. B 93, 195438] Published Thu May 26, 2016

]]>Previous measurements of neutral atom fractions for $\mathrm{S}{\mathrm{r}}^{+}$ scattered by gold polycrystalline surfaces show a singular dependence with the target temperature. There is still not a theoretical model that can properly describe the magnitude and the temperature dependence of the neutralization probabilitie…

[Phys. Rev. B 93, 195439] Published Thu May 26, 2016

]]>A charge current driven through a two-dimensional electron gas (2DEG) with Rashba spin-orbit coupling generates a spatially homogeneous spin polarization perpendicular to the applied electric field. This phenomenon is the Aronov–Lyanda-Geller–Edelstein (ALGE) effect. For selected model systems, we c…

[Phys. Rev. B 93, 195440] Published Thu May 26, 2016

]]>[Phys. Rev. B 93, 199905] Published Thu May 26, 2016

]]>[Phys. Rev. B 93, 199906] Published Thu May 26, 2016

]]>We revisit the SU(6) Heisenberg model on the honeycomb lattice, which has been predicted to be a chiral spin liquid by mean-field theory [G. Szirmai *et al.*, Phys. Rev. A **84**, 011611(R) (2011)]. Using exact diagonalizations of finite clusters, infinite projected entangled pair state simulations, and …

[Phys. Rev. B 93, 201113(R)] Published Thu May 26, 2016

]]>Based on first-principles calculations and an effective Hamiltonian analysis, we systematically investigate the electronic and topological properties of alkaline-earth compounds $A{X}_{2}$ $(A=\text{Ca}$, Sr, Ba; $X=\text{Si}$, Ge, Sn). Taking ${\mathrm{BaSn}}_{2}$ as an example, we find that when spin-orbit coupling is ignored, these mate…

[Phys. Rev. B 93, 201114(R)] Published Thu May 26, 2016

]]>We report a combined study of the spin resonances and superconducting gaps for underdoped (${T}_{c}=19$ K), optimally doped (${T}_{c}=25$ K), and overdoped (${T}_{c}=19$ K) $\mathrm{Ba}{\left({\mathrm{Fe}}_{1-x}{\mathrm{Co}}_{x}\right)}_{2}{\mathrm{As}}_{2}$ single crystals with inelastic neutron scattering and angle resolved photoemission spectroscopy. We find a quasi-two-dimensional sp…

[Phys. Rev. B 93, 205149] Published Thu May 26, 2016

]]>A pressure-induced interaction between core electrons, the core-level crossing (CLC) transition, has been observed in hcp Os at $P\approx 400\phantom{\rule{0.28em}{0ex}}\mathrm{GPa}$ [L. Dubrovinsky *et al.*, Nature (London) **525**, 226 (2015)]. By carrying out a systematic theoretical study for all metals of the $5d$ series (Hf, Ta, W, Re, Os, Ir, Pt…

[Phys. Rev. B 93, 205150] Published Thu May 26, 2016

]]>We use the Gutzwiller density-functional theory to calculate ground-state properties and band structures of iron in its body-centered-cubic (bcc) and hexagonal-close-packed (hcp) phases. For a Hubbard interaction $U=9\phantom{\rule{4pt}{0ex}}\mathrm{eV}$ and Hund's-rule coupling $J=0.54\phantom{\rule{4pt}{0ex}}\mathrm{eV}$, we reproduce the lattice parameter, magnetic m…

[Phys. Rev. B 93, 205151] Published Thu May 26, 2016

]]>Results are presented for the occupation probabilities and current densities of bulk and edge states of half-filled graphene in a cylindrical geometry and irradiated by a circularly polarized laser. It is assumed that the system is closed and that the laser has been switched on as a quench. Laser pa…

[Phys. Rev. B 93, 205437] Published Thu May 26, 2016

]]>Topological effects continue to fascinate physicists since more than three decades. One of their main applications are high-precision measurements of the resistivity. We propose to make also use of the spatially separated edge states. It is possible to realize strongly direction-dependent group velo…

[Phys. Rev. B 93, 205438] Published Thu May 26, 2016

]]>We probe here the optical relaxation properties of Mg-doped wide-band-gap ${\mathrm{LiNbO}}_{3}$ single crystals with both a high spectral and temporal resolution at cryogenic temperatures. Surprisingly, we observe the photoluminescence to decay in a two-step process: a fast relaxation and a slower one centered aro…

[Phys. Rev. B 93, 174116] Published Wed May 25, 2016

]]>We analyze the interplay between superconductivity and the formation of bound pairs of fermions (BCS-BEC crossover) in a 2D model of interacting fermions with small Fermi energy ${E}_{F}$ and weak attractive interaction, which extends to energies well above ${E}_{F}$. The 2D case is special because a two-particle…

[Phys. Rev. B 93, 174516] Published Wed May 25, 2016

]]>We investigate the bulk orbital angular momentum (AM) in a two-dimensional hole-doped topological superconductor (SC) which is composed of a hole-doped semiconductor thin film, a magnetic insulator, and an $s$-wave SC and is characterized by the Chern number $C=-3$. In the topological phase, ${L}_{z}/N$ is str…

[Phys. Rev. B 93, 174517] Published Wed May 25, 2016

]]>A variational Monte Carlo method for bosonic lattice models is introduced. The method is based on the Baeriswyl projected wave function. The Baeriswyl wave function consists of a kinetic energy based projection applied to the wave function at infinite interaction, and is related to the shadow wave f…

[Phys. Rev. B 93, 174518] Published Wed May 25, 2016

]]>In conventional superconductors, the energy gap lies in the frequency range of few tenths of terahertz (THz), making THz spectroscopy the best tool to access its fundamental excitations. Recently it has been shown by R. Matsunaga \textit{et al}. that the use of intense, coherent multicycle THz pulses allows one to measure, in a NbN film, a component of the transmitted pulse oscillating three times faster than the incident light. It is found that this effect, named third-harmonic generation, has its maximum intensity at the temperature below ${T}_{c}$, where the light frequency $\omega $ matches the superconducting gap value $\mathrm{\Delta}$(T), pointing to a resonant process involving excitations specific of the superconducting state. What is the nature of this resonance? While previous work attributed this resonance to the Higgs mode, i.e., to amplitude fluctuations of the superconducting order parameter, the present paper comes to a different conclusion. By providing a detailed microscopic derivation of the nonlinear optical response, the authors show that the 3$\omega $ current response is controlled by the lattice-modulated density fluctuations. As a consequence, the third-harmonic generation turns out to be largely dominated by Cooper-pair excitations, which pile up at 2$\mathrm{\Delta}$. At the same time, in analogy with the standard Raman response, the Higgs signal is suppressed by the extremely small coupling to the probing field. The authors discuss also the polarization dependence of the nonlinear 3$\omega $ response, which opens the route to a Raman-like symmetry-selective probe of the superconducting excitations. This result offers challenging perspectives for THz spectroscopy of several systems, including cuprate superconductors.

[Phys. Rev. B 93, 180507(R)] Published Wed May 25, 2016

]]>Superconducting ${\mathrm{MgB}}_{2}$ shows an ${E}_{2g}$ zone center phonon, as measured by Raman spectroscopy, that is very broad in energy and temperature dependent. The Raman shift and lifetime show large differences with the values elsewhere in the Brillouin zone measured by inelastic x-ray scattering (IXS), where its…

[Phys. Rev. B 93, 180508(R)] Published Wed May 25, 2016

]]>We report a detailed muon-spin rotation study of the pressure evolution of the magnetic order in the manganese-based pnictide MnP, which has been recently found to undergo a superconducting transition under pressure once the magnetic ground state is suppressed. Using the muon as a volume sensitive l…

[Phys. Rev. B 93, 180509(R)] Published Wed May 25, 2016

]]>We report the structural changes of three $\mathrm{YF}{\mathrm{e}}_{2}{\mathrm{O}}_{4-\delta}$ ($\delta <0.1$) specimens using high resolution synchrotron x-ray powder diffraction between 80 and 300 K. All samples adopt a rhombohedral cell at room temperature (space group $R\overline{3}m$). This cell becomes unstable for the three samples on cooling, and the …

[Phys. Rev. B 93, 184110] Published Wed May 25, 2016

]]>We present a dynamical approach to generate defect-free continuous-random-network (CRN) models of hydrogenated amorphous silicon ($a$-Si:H). Using the atomic coordination number of silicon as a collective variable and few configurational constraints, we have shown that classical metadynamics can be us…

[Phys. Rev. B 93, 184202] Published Wed May 25, 2016

]]>We demonstrate that short-wavelength exchange-coupled magnons can be identified electrically through the combination of their spin-pumping and damping properties in a metal/magnetic insulator heterostructure. We present clear wave-vector dependence of the spin pumping from parametrically excited exc…

[Phys. Rev. B 93, 184429] Published Wed May 25, 2016

]]>Observation of significant negative exchange bias (${H}_{E}$) is reported in solid solutions of single-phase samples of $\mathrm{D}{\mathrm{y}}_{1-x}\mathrm{N}{\mathrm{d}}_{x}\mathrm{Cr}{\mathrm{O}}_{3}$ for $x=0.33,\phantom{\rule{0.16em}{0ex}}0.67,$ and 1 with corresponding Néel temperatures at ${T}_{N}^{\mathrm{Cr}}=175\phantom{\rule{0.16em}{0ex}}\mathrm{K},\phantom{\rule{4pt}{0ex}}200\phantom{\rule{0.16em}{0ex}}\mathrm{K},$ and 225 K, respectively, and the spin-reorientation transitions ${T}_{SR}$ at 48 K, 58 K, and 38 K, re…

[Phys. Rev. B 93, 184430] Published Wed May 25, 2016

]]>In this paper, we illustrate the dilemma of inverse magnetocaloric materials using the example of Heusler alloys. For such materials, the magnetic and lattice contribution to the total entropy change are competing with each other. For the two paradigmatic Heusler systems of Ni-Mn-In and Ni-Mn-In-Co,…

[Phys. Rev. B 93, 184431] Published Wed May 25, 2016

]]>We study light propagation in a neutral Weyl semimetal with the Fermi level lying at the Weyl nodes in the weak self-interacting regime. The nontrivial topology induces a screening effect in one of the two transverse gauge fields, for which we find two branches of attenuated collective excitations. …

[Phys. Rev. B 93, 195154] Published Wed May 25, 2016

]]>Transition-metal-based Heusler semiconductors are promising materials for a variety of applications ranging from spintronics to thermoelectricity. Employing the $GW$ approximation within the framework of the FLAPW method, we study the quasiparticle band structure of a number of such compounds being al…

[Phys. Rev. B 93, 195155] Published Wed May 25, 2016

]]>An alternative approach of using a distributed transmission line analogy for solving transport equations for ballistic nanostructures is applied for solving the three-dimensional problem of electron transport in gated ballistic nanostructures with periodically changing width. The structures with var…

[Phys. Rev. B 93, 195315] Published Wed May 25, 2016

]]>One of the key challenges in developing quantum networks is to generate single photons with high brightness, purity, and long temporal coherence. Semiconductor quantum dots potentially satisfy these requirements; however, due to imperfections in the surrounding material, the coherence generally degr…

[Phys. Rev. B 93, 195316] Published Wed May 25, 2016

]]>We present the first-principles studies on the hydrostatic pressure effect of the electronic properties of black phosphorus. We show that the energy bands crossover around the critical pressure ${P}_{c}=1.23$ GPa; with increasing pressure, the band reversal occurs at the $Z$ point and evolves into 4 twofold-…

[Phys. Rev. B 93, 195434] Published Wed May 25, 2016

]]>Relying on generalized-gradient and hybrid first-principles simulations, this work provides a complete characterization of the electronic properties of ZnO ultrathin films, cut along the body-centered-tetragonal(010), cubane(100), hexagonal boron nitride(0001), zinc-blende(110), and wurtzite ($10\overline{1}0$)…

[Phys. Rev. B 93, 195435] Published Wed May 25, 2016

]]>[Phys. Rev. B 93, 199904] Published Wed May 25, 2016

]]>The ferromagnetic superconductor URhGe has been known to exhibit an extremely large enhancement of the upper critical field when the field is confined and rotated in the $\left(ab\right)$ crystal plane. Our high-field ${}^{59}\mathrm{Co}$ NMR measurements on 10% Co-doped URhGe up to 30 T prove that this unconventional behavior …

[Phys. Rev. B 93, 201112(R)] Published Wed May 25, 2016

]]>Defect-assisted nonradiative Shockley-Read-Hall recombination is an important process in wide-band-gap semiconductors. However, nonradiative capture rates decrease exponentially with the energy of the transition, and therefore the mechanisms by which such recombination can take place are unclear. The authors show here that excited states of defects play a key role in turning specific defects into efficient nonradiative centers. The wider the band gap of the material, the greater a role these excited states are likely to play. Specifically, the authors can explain why certain gallium vacancy complexes are efficient nonradiative centers in group-III nitrides, the key materials for solid-state lighting.

[Phys. Rev. B 93, 201304(R)] Published Wed May 25, 2016

]]>The rich phenomenology of plasmonic excitations in the dichalcogenides is analyzed as a function of doping. The many-body polarization, the dielectric response function, and electron energy loss spectra are calculated using an *ab initio* based model involving material-realistic Coulomb interactions, …

[Phys. Rev. B 93, 205145] Published Wed May 25, 2016

]]>We numerically investigate the growth of the entanglement entropy ${S}_{\mathrm{ent}}\left(t\right)$ in time $t$, after a global quench from a product state, in quantum chains with various kinds of disorder. The main focus is, in particular, on fermionic chains with bond disorder. In the noninteracting case at criticality we nu…

[Phys. Rev. B 93, 205146] Published Wed May 25, 2016

]]>Effective mass calculations are currently based on finite-difference estimations of electronic band curvature (or Hessians). This requires an extra convergence study that can easily reach problematic levels if not carefully monitored. While these issues could be considered hindrances in traditional first-principles calculations, they become more fundamental limitations within the quickly expanding field of high-throughput material design. To eliminate these issues, a new method is developed based on density functional perturbation theory (DFPT) that directly computes the Hessian of DFT bands. The new method includes a generalized k.p formalism within which it is possible to define effective masses at degenerate band extrema. The result is a simulation method of effective masses that is general, robust, and simple to use, which should open new routes in high-throughput material design.

[Phys. Rev. B 93, 205147] Published Wed May 25, 2016

]]>We consider a nonequilibrium system of interacting emitters described by the XXZ model, whose excitonic transitions are spatially and spectrally coupled to a single mode cavity. We demonstrate that the output radiation field is sensitive to an interplay between the hopping ($J$) and the interactions ($\dots $

[Phys. Rev. B 93, 205148] Published Wed May 25, 2016

]]>We study electromagnetic properties of a double-layer graphene system in which electrons from one layer are coupled with holes from the other layer. The gauge invariant linear response functions are obtained. The frequency dependences of the transmission, reflection, and absorption coefficients are …

[Phys. Rev. B 93, 205436] Published Wed May 25, 2016

]]>Electric fields are known to favor long-range polar order through the aligning of electric dipoles in relation to Coulomb's force. Therefore, it would be surprising to observe a disordered polar state induced from an ordered state by electric fields. Here we show such an unusual phenomenon in a poly…

[Phys. Rev. B 93, 174114] Published Tue May 24, 2016

]]>Local distortions of the ideal periodic structure in crystals around impurity atoms play an important role in various physical properties of materials. The aim of this study was to investigate the static distortions around cadmium impurity atoms in a ${\text{SnCd}}_{0.0026}$ single crystal using atomic resolution…

[Phys. Rev. B 93, 174115] Published Tue May 24, 2016

]]>Contrary to the original expectation, ${\mathrm{Na}}_{2}{\mathrm{IrO}}_{3}$ is not a Kitaev's quantum spin liquid (QSL) but shows a zigzag-type antiferromagnetic order in experiments. Here, we propose experimental clues and criteria to measure how a material in hand is close to the Kitaev's QSL state. For this purpose, we system…

[Phys. Rev. B 93, 174425] Published Tue May 24, 2016

]]>Determining the symmetry of the superconducting order parameter is the most important but also the most complicated step in elucidating the mechanism of superconductivity. Here we present an experimental approach to investigate the order parameter symmetry of unconventional multiband superconductors…

[Phys. Rev. B 93, 174515] Published Tue May 24, 2016

]]>A metallic state enabled by the metal-insulator transition (MIT) in single crystal $\mathrm{V}{\mathrm{O}}_{2}\left(\mathrm{A}\right)$ nanorods is demonstrated, which provides important physical foundation in experimental understanding of MIT in $\mathrm{V}{\mathrm{O}}_{2}$. The observed tetragonal metallic state at ∼28 GPa should be interpreted as a distinct metastab…

[Phys. Rev. B 93, 184109] Published Tue May 24, 2016

]]>We explore quantum and classical correlations along with coherence in the ground states of spin-1 Heisenberg chains, namely the one-dimensional XXZ model and the one-dimensional bilinear biquadratic model, with the techniques of density matrix renormalization group theory. Exploiting the tools of qu…

[Phys. Rev. B 93, 184428] Published Tue May 24, 2016

]]>Recent experiments have demonstrated that the metamaterial approach is capable of a drastic increase of the critical temperature ${T}_{\mathrm{c}}$ of epsilon near zero (ENZ) metamaterial superconductors. For example, tripling of the critical temperature has been observed in $\mathrm{Al}-\mathrm{A}{\mathrm{l}}_{2}{\mathrm{O}}_{3}$ ENZ core-shell metamaterials. H…

[Phys. Rev. B 93, 184510] Published Tue May 24, 2016

]]>We theoretically study the quantum anomalies in the superconducting Weyl metals based on the topological field theory. It is demonstrated that the Fermi arc and the surface Andreev bound state, characteristic of the superconducting Weyl metals, are the manifestations of two underlying phenomena, nam…

[Phys. Rev. B 93, 184511] Published Tue May 24, 2016

]]>We present measurements of the superconducting and charge-density-wave (CDW) critical temperatures $({T}_{c}$ and ${T}_{\text{CDW}})$ as a function of pressure in the transition metal dichalchogenides $2H\text{\u2212}{\text{TaSe}}_{2}$ and $2H\text{\u2212}{\mathrm{TaS}}_{2}$. Resistance and susceptibility measurements show that ${T}_{c}$ increases from temperatures below 1 K up t…

[Phys. Rev. B 93, 184512] Published Tue May 24, 2016

]]>The topological property of ${\mathrm{SrRu}}_{2}{\mathrm{O}}_{6}$ and isostructural ${\mathrm{CaOs}}_{2}{\mathrm{O}}_{6}$ under various strain conditions is investigated using density functional theory. Based on an analysis of parity eigenvalues, we anticipate that a three-dimensional strong topological insulating state should be realized when band inversion…

[Phys. Rev. B 93, 195149] Published Tue May 24, 2016

]]>We present a refined and improved study of the influence of screening on the effective fine structure constant of graphene, ${\alpha}^{*}$, as measured in graphite using inelastic x-ray scattering. This followup to our previous study [J. P. Reed *et al.*, Science **330**, 805 (2010)] was carried out with two times b…

[Phys. Rev. B 93, 195150] Published Tue May 24, 2016

]]>We show that, with a system of electrically gated wide quantum wells embedded inside a simple dielectric waveguide structure, it is possible to excite, control, and observe waveguided exciton polaritons that carry an electric dipole moment. We demonstrate that the energy of the propagating dipolarit…

[Phys. Rev. B 93, 195151] Published Tue May 24, 2016

]]>Some of the plasmonic phenomena can be imitated by exploiting the structural dispersion of parallel-plate waveguides filled with positive dielectrics. This synthetic platform, as a test bed for exploring plasmonic features, is more suitable for longer-wavelength regimes and may exhibit lower loss, since positive dielectric materials are utilized.

[Phys. Rev. B 93, 195152] Published Tue May 24, 2016

]]>We engineer topological insulating phases in a fermion-fermion mixture on the honeycomb lattice, without resorting to artificial gauge fields or spin-orbit couplings and considering only local interactions. Essentially, upon integrating out the fast component (characterized by a larger hopping ampli…

[Phys. Rev. B 93, 195153] Published Tue May 24, 2016

]]>Using *in situ* surface electron microscopy, we show that the surface chemical potential of GaAs (001), and hence the surface phase, can be systematically controlled by varying temperature with liquid Ga droplets present as Ga reservoirs. With decreasing temperature, the surface approaches equilibrium…

[Phys. Rev. B 93, 195314] Published Tue May 24, 2016

]]>We present the optimized design of an antireflection coating to efficiently couple an incident plane wave into a metamaterial with a complex field profile. We show that such an antireflection coating must enable spatial engineering of the field profiles at the coating/metamaterial interface to achie…

[Phys. Rev. B 93, 195433] Published Tue May 24, 2016

]]>[Phys. Rev. B 93, 199903] Published Tue May 24, 2016

]]>Magnetic properties of NiO have been studied in the multimegabar pressure range by nuclear forward scattering of synchrotron radiation using the 67.4 keV Mössbauer transition of ${}^{61}\mathrm{Ni}$. The observed magnetic hyperfine splitting confirms the antiferromagnetic state of NiO up to 280 GPa, the highest pre…

[Phys. Rev. B 93, 201110(R)] Published Tue May 24, 2016

]]>We quantitatively illustrate the fundamental limit that exciton-exciton annihilation (EEA) may impose on the light emission of monolayer transition metal dichalcogenide (TMDC) materials. The EEA in TMDC monolayers shows a dependence on the interaction with substrates as its rate increases from $0.1\phantom{\rule{0.16em}{0ex}}\mathrm{c}{\mathrm{m}}^{\mathrm{\dots}}$

[Phys. Rev. B 93, 201111(R)] Published Tue May 24, 2016

]]>Using angle-resolved photoemission spectroscopy (ARPES), we studied the effect of the impurity potential on the electronic structure of ${\mathrm{FeTe}}_{0.5}{\mathrm{Se}}_{0.5}$ superconductor by substituting 10% of Ni for Fe, which leads to an electron doping of the system. We could resolve three hole pockets near the zone cen…

[Phys. Rev. B 93, 205143] Published Tue May 24, 2016

]]>We investigate the ground state properties of the gaseous mixture of a single species of bosons and fermions at zero temperature, where bosons are major in population over fermions, and form the Bose-Einstein condensate (BEC). The boson-boson and boson-fermion interactions are assumed to be weakly r…

[Phys. Rev. B 93, 205144] Published Tue May 24, 2016

]]>Unlike the local density approximation (LDA) and the generalized gradient approximation (GGA), calculations with meta-generalized gradient approximations (meta-GGA) are usually done according to the generalized Kohn-Sham (gKS) formalism. The exchange-correlation potential of the gKS equation is nonm…

[Phys. Rev. B 93, 205205] Published Tue May 24, 2016

]]>Recently, West and Fong [New J. Phys. **14**, 083002 (2012)] introduced an echo scheme for an exchange-only qubit, which relies entirely on the exchange interaction. Here, we compare two different exchange-based sequences and two optimization strategies, Uhrig dynamical decoupling and optimized filter f…

[Phys. Rev. B 93, 205434] Published Tue May 24, 2016

]]>Using Floquet theory, we illustrate that Floquet Weyl fermions can be created in three-dimensional stacked graphene systems irradiated by circularly polarized light. One or two semi-Dirac points can be formed due to overlapping of Floquet subbands. Each pair of Weyl points have a two-component semi-…

[Phys. Rev. B 93, 205435] Published Tue May 24, 2016

]]>Accurate theoretical calculations of the nonlinear elastic response of strong solids (e.g., diamond) constitute a fundamental and important scientific need for understanding the response of such materials and for exploring the potential synthesis and design of novel solids. However, without correspo…

[Phys. Rev. B 93, 174113] Published Mon May 23, 2016

]]>We present a model that reveals an interesting possibility for narrowing the size distribution of nanostructures when the deterministic growth rate changes its sign from positive to negative at a certain stationary size. Such a behavior occurs in self-catalyzed one-dimensional III-V nanowires and mo…

[Phys. Rev. B 93, 174203] Published Mon May 23, 2016

]]>The dynamical interplay between electron-electron interactions and electron-phonon coupling is investigated within the Anderson-Holstein model, a minimal model for open quantum systems that embody these effects. The influence of phonons on spectral and transport properties is explored in equilibrium…

[Phys. Rev. B 93, 174309] Published Mon May 23, 2016

]]>We systematically investigate the spin-orbit coupling-induced band splitting originating from inversion symmetry breaking at the interface between a Co monolayer and $4d$ (Tc, Ru, Rh, Pd, and Ag) or $5d$ (Re, Os, Ir, Pt, and Au) transition metals. In spite of the complex band structure of these systems,…

[Phys. Rev. B 93, 174421] Published Mon May 23, 2016

]]>Inelastic neutron scattering study on the spin-chain compound ${\mathrm{Sr}}_{3}{\mathrm{NiIrO}}_{6}$ reveals gapped quasi-1D magnetic excitations. The observed one-magnon band between 29.5 and 39 meV consists of magnon modes of the ${\mathrm{Ni}}^{2+}$ ions. The fitting of the spin wave spectrum reveals strongly coupled Ising-like chains along…

[Phys. Rev. B 93, 174422] Published Mon May 23, 2016

]]>We demonstrate time-resolved spectroscopy of spin-current emission from a magnetic insulator using the inverse spin Hall effect (ISHE). We measured magnetic field dependence of the spin-current emission in the time domain and found that the spectral shape of the ISHE voltage changes with time. The c…

[Phys. Rev. B 93, 174423] Published Mon May 23, 2016

]]>We investigate the current-induced domain wall motion in perpendicular magnetized Tb/Co wires with structure inversion asymmetry and different layered structures. We find that the critical current density to drive domain wall motion strongly depends on the layered structure. The lowest critical curr…

[Phys. Rev. B 93, 174424] Published Mon May 23, 2016

]]>We report the transport, thermodynamic, muon spin relaxation, and neutron study of the ${\mathrm{Ca}}_{0.74\left(1\right)}{\mathrm{La}}_{0.26\left(1\right)}$(${\mathrm{Fe}}_{1-x}{\mathrm{Co}}_{x}$)${\mathrm{As}}_{2}$ single crystals, mapping out the temperature-doping level phase diagram. Upon Co substitution on the Fe site, the structural and magnetic phase transitions in this 112 compound are …

[Phys. Rev. B 93, 174513] Published Mon May 23, 2016

]]>The Josephson effect between a single-crystal ${\mathrm{UPt}}_{3}$ and a conventional superconductor Al has been investigated under pressure for the junction on the ${\mathrm{UPt}}_{3}$ surface perpendicular to the hexagonal $c\left[0001\right]$ axis. Simultaneously measured magnetization has revealed that the Meissner fraction approaches a mi…

[Phys. Rev. B 93, 174514] Published Mon May 23, 2016

]]>We theoretically demonstrate dc and ac electric voltage generation due to spin motive forces originating from domain wall motion and magnetic resonance, respectively, in two-sublattice antiferromagnets. Our theory accounts for the canting between the sublattice magnetizations, the nonadiabatic elect…

[Phys. Rev. B 93, 180408(R)] Published Mon May 23, 2016

]]>Variation of the phase of the beam transmitted through a crystalline material as a function of the rocking angle is a well-known dynamical effect in x-ray scattering. Unfortunately, it is not so easy to directly measure these phase variations in a conventional scattering experiment. It was recently …

[Phys. Rev. B 93, 184107] Published Mon May 23, 2016

]]>A correct description of hydrogen diffusion and trapping is the prerequisite for an understanding of the phenomenon of hydrogen embrittlement. In this study, we carried out extensive first-principles calculations based on density functional theory to investigate the interaction of H with TiC precipi…

[Phys. Rev. B 93, 184108] Published Mon May 23, 2016

]]>Congruent lithium niobate and lithium tantalate mixed crystals have been grown over the complete compositional range with the Czochralski method. The structural and vibrational properties of the mixed crystals are studied extensively by x-ray diffraction measurements, Raman spectroscopy, and density…

[Phys. Rev. B 93, 184305] Published Mon May 23, 2016

]]>We report a study on the complete spin-wave spectrum inside a vortex-state nanodisk. Transformation of this spectrum is continuously monitored as the nanodisk becomes gradually magnetized by a perpendicular magnetic field and encounters a second-order phase transition to the uniformly magnetized sta…

[Phys. Rev. B 93, 184427] Published Mon May 23, 2016

]]>The isotope effect in superconductivity (SC) is used to make a concrete connection to a quantum critical point (QCP) that is tunable by isotopic mass substitution. We find a distinct contribution to the isotope exponent in SC and derive an explicit relation to the critical exponent of a QCP. The rel…

[Phys. Rev. B 93, 184507] Published Mon May 23, 2016

]]>We perform a numerical simulation of the dynamics of quantized vortices produced by coflow in a square channel using the vortex filament model. Unlike the situation in thermal counterflow, where the superfluid velocity ${\mathit{v}}_{s}$ and normal-fluid velocity ${\mathit{v}}_{n}$ flow in opposite directions, in coflow, ${\mathit{v}}_{s}$ and ${\mathit{v}}_{n}$…

[Phys. Rev. B 93, 184508] Published Mon May 23, 2016

]]>Perpendicular-to-the-plane magnetic field tuned reentrant superconductivity in out-of-equilibrium, quasi-one-dimensional (quasi-1D) planar nanowires is a novel, counterintuitive phenomenon. It was not until recently that a microscopic mechanism explaining the phenomenon as arising from the coexisten…

[Phys. Rev. B 93, 184509] Published Mon May 23, 2016

]]>A numerical method to calculate optical conductivity based on a pump-probe setup is presented. Its validity and limits are tested and demonstrated via concrete numerical simulations on the half-filled one-dimensional extended Hubbard model both in and out of equilibrium. By employing either a stepli…

[Phys. Rev. B 93, 195144] Published Mon May 23, 2016

]]>Anisotropic dipole-dipole interactions between ultracold dipolar fermions break the symmetry of the Fermi surface and thereby deform it. Here we demonstrate that such a Fermi surface deformation induces a topological phase transition—the so-called Lifshitz transition—in the regime accessible to pres…

[Phys. Rev. B 93, 195145] Published Mon May 23, 2016

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