Preview: Recent Articles in Phys. Rev. B
Recent Articles in Phys. Rev. BRecent articles in Physical Review BPublished: 2012-02-09T20:06:20-05:00
Structural transformation and vibrational properties of BaC_{2} at high pressure 2012-02-09T10:00:00-05:00 Author(s): I. Efthimiopoulos, K. Kunc, G. V. Vazhenin, E. Stavrou, K. Syassen, M. Hanfland, St. Liebig, and U. RuschewitzWe show that the ambient-pressure tetragonal phase of BaC2 (CaC2-type, space group I4/mmm), with sixfold coordination of Ba atoms and C2 dumbbells, transforms reversibly to a new structure type at 4 GPa; it is an eight-coordinated rhombohedral modification (space group R3̅ m), which can be vi... [Phys. Rev. B 85, 054105] Published Thu Feb 09, 2012
Phonon Raman scattering of RCrO_{3} perovskites (R=Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu) 2012-02-09T10:00:00-05:00 Author(s): M. C. Weber, J. Kreisel, P. A. Thomas, M. Newton, K. Sardar, and R. I. WaltonWe report a systematic investigation of orthorhombic perovskite-type RCrO3 powder samples by Raman scattering for nine different rare earth R3+ cations (R = Y, La, Pr, Sm, Gd, Dy, Ho, Yb, and Lu). The room-temperature Raman spectra and the associated phonon mode assignment provide reference data for... [Phys. Rev. B 85, 054303] Published Thu Feb 09, 2012
Phase transitions in spin-orbital models with spin-space anisotropies for iron pnictides: Monte Carlo simulations 2012-02-09T10:00:00-05:00 Author(s): Ryan Applegate, Rajiv R. P. Singh, Cheng-Chien Chen, and Thomas P. DevereauxThe common phase diagrams of superconducting iron pnictides show interesting material specificities in the structural and magnetic phase transitions. In some cases the two transitions are separate and second order, while in others they appear to happen concomitantly as a single first-order transitio... [Phys. Rev. B 85, 054411] Published Thu Feb 09, 2012
Systematic study of ferroelectric, interfacial, oxidative, and doping effects on conductance of Pt/BaTiO_{3}/Pt ferroelectic tunnel junctions 2012-02-09T10:00:00-05:00 Author(s): Lei Shen (沈雷), Tiejun Zhou, Zhaoqiang Bai, Minggang Zeng, Jing Qiang Goh, Zhi-min Yuan, Guchang Han, Bo Liu, and Yuan Ping FengUsing the nonequilibrium Green's function method combined with density functional theory, we systematically study the ferroelectric, interfacial, oxidative, and doping effects on electron transport of BaTiO3-based ferroelectric tunnel junctions (Pt/BaTiO3/Pt). The ferroelectric effect reduces the tu... [Phys. Rev. B 85, 064105] Published Thu Feb 09, 2012
Magnetic-field tuned anisotropy in superconducting Rb_{x}Fe_{2−y}Se_{2} 2012-02-09T10:00:00-05:00 Author(s): S. Bosma, R. Puzniak, A. Krzton-Maziopa, M. Bendele, E. Pomjakushina, K. Conder, H. Keller, and S. WeyenethThe anisotropic superconducting properties of a RbxFe2−ySe2 single crystal with Tc≃32 K were investigated by means of superconducting quantum interference device (SQUID) and torque magnetometry, probing the effective magnetic penetration depth λeff and the magnetic penetration depth anisotropy γλ. I... [Phys. Rev. B 85, 064509] Published Thu Feb 09, 2012
Reconstructing the bulk Fermi surface and superconducting gap properties from neutron scattering experiments 2012-02-09T10:00:00-05:00 Author(s): Tanmoy Das, R. S. Markiewicz, and A. BansilWe develop an analytical tool to extract bulk electronic properties of unconventional superconductors from inelastic neutron scattering spectra. We show that the upward and downward branches of the spin excitation spectra have distinct origins, with the upper branch representing a gapped spin-wave d... [Phys. Rev. B 85, 064510] Published Thu Feb 09, 2012
Quarter-filled honeycomb lattice with a quantized Hall conductance 2012-02-09T10:00:00-05:00 Author(s): Ganpathy Murthy, Efrat Shimshoni, R. Shankar, and H. A. FertigWe study a generic two-dimensional hopping model on a honeycomb lattice with strong spin-orbit coupling, without the requirement that the half-filled lattice be a topological insulator. For quarter-(or three-quarter) filling, we show that a state with a quantized Hall conductance generically arises ... [Phys. Rev. B 85, 073103] Published Thu Feb 09, 2012
Interplay of Aharonov-Bohm, chirality, and aspect-ratio effects in the axial conductance of a nanotube 2012-02-09T10:00:00-05:00 Author(s): Eugene B. Kolomeisky, Hussain Zaidi, and Joseph P. StraleyA magnetic field applied along the axis of a nanotube can counteract the effect of the tube chirality and dramatically affect its conductance, leading to a way to determine the chirality of a nanotube. The effect of the applied field is strongest in the long tube limit where the conductance is eithe... [Phys. Rev. B 85, 073404] Published Thu Feb 09, 2012
Competing orders in the Dirac-like electronic structure and the nonlinear sigma model with a topological term 2012-02-09T10:00:00-05:00 Author(s): Pouyan Ghaemi and Shinsei RyuThe Dirac-like electronic structure can host a large number of competing orders in the form of mass terms. In particular, two different order parameters can be said to be dual to each other, when a static defect in one of them traps a quantum number (or “charge”) of the other. We discuss that such c... [Phys. Rev. B 85, 075111] Published Thu Feb 09, 2012
Hole spin relaxation and coefficients in Landau-Lifshitz-Gilbert equation in ferromagnetic (Ga,Mn)As 2012-02-09T10:00:00-05:00 Author(s): K. Shen and M. W. WuWe investigate the temperature dependence of the coefficients in the Landau-Lifshitz-Gilbert equation in ferromagnetic GaMnAs by employing the Zener model. We first calculate the hole spin relaxation time based on the microscopic kinetic equation. We find that the hole spin relaxation time is typica... [Phys. Rev. B 85, 075206] Published Thu Feb 09, 2012
Magnetic properties of the doped spin-1/2 honeycomb-lattice compound In_{3}Cu_{2}VO_{9} 2012-02-09T10:00:00-05:00 Author(s): Y. J. Yan, Z. Y. Li, T. Zhang, X. G. Luo, G. J. Ye, Z. J. Xiang, P. Cheng, L. J. Zou, and X. H. ChenWe report magnetic properties in the Co- and Zn-doped spin-1/2 honeycomb-lattice compound In3Cu2VO9. Magnetic susceptibility and specific heat experiments show no long-range ordering down to 2 K in In3Cu2VO9. Analyses of electronic structures and states suggest that the ground state of undoped In3Cu... [Phys. Rev. B 85, 085102] Published Thu Feb 09, 2012
Symmetry-protected topological phases in noninteracting fermion systems 2012-02-09T10:00:00-05:00 Author(s): Xiao-Gang WenSymmetry-protected topological (SPT) phases are gapped quantum phases with a certain symmetry, which can all be smoothly connected to the same trivial product state if we break the symmetry. For noninteracting fermion systems with time reversal (T̂), charge conjugation (Ĉ), and/or U(1) (N̂) symmetr... [Phys. Rev. B 85, 085103] Published Thu Feb 09, 2012
Tunneling transport through superconducting wires with Majorana bound states 2012-02-09T10:00:00-05:00 Author(s): B. H. Wu and J. C. CaoWe investigate the transport of a topological superconducting wire hosting a pair of Majorana bound states between two normal leads. Both the model-independent scattering matrix theory and the Green's function method for a tight-binding model show that the transport properties are sensitive to the c... [Phys. Rev. B 85, 085415] Published Thu Feb 09, 2012
Metal-dielectric-metal surface plasmon-polariton resonators 2012-02-09T10:00:00-05:00 Author(s): Anu Chandran, Edward S. Barnard, Justin S. White, and Mark L. BrongersmaA theoretical study of standing-wave resonances of surface plasmon polaritons (SPPs) in finite-length metal-dielectric-metal cavities is presented. A Fabry-Pérot model is constructed to describe the cavity resonances, and the associated optical parameters are calculated analytically. One key paramet... [Phys. Rev. B 85, 085416] Published Thu Feb 09, 2012
Brillouin scattering studies of acoustic phonon modes and central peak in single-crystal Pb(Sc_{1/2}Ta_{1/2})O_{3} 2012-02-08T10:00:00-05:00 Author(s): V. Sivasubramanian and S. KojimaBrillouin spectra measurements have been carried out from 800 to 100 K for Pb(Sc1/2Ta1/2)O3 in back-scattering geometry. The frequency of the longitudinal acoustic (LA) phonon begins to show marked softening followed by an increase in its width below the intermediate temperature T* = 450 K. The grad... [Phys. Rev. B 85, 054104] Published Wed Feb 08, 2012
Ground-state characterizations of systems predicted to exhibit L1_{1} or L1_{3} crystal structures 2012-02-08T10:00:00-05:00 Author(s): Lance J. Nelson, Gus L. W. Hart, and Stefano CurtaroloDespite their geometric simplicity, the crystal structures L11 (CuPt) and L13 (CdPt3) do not appear as ground states experimentally, except in Cu-Pt. We investigate the possibility that these phases are ground states in other binary intermetallic systems, but overlooked experimentally. Via the syner... [Phys. Rev. B 85, 054203] Published Wed Feb 08, 2012
Field-induced phases in UPt_{2}Si_{2} 2012-02-08T10:00:00-05:00 Author(s): D. Schulze Grachtrup, M. Bleckmann, B. Willenberg, S. Süllow, M. Bartkowiak, Y. Skourski, H. Rakoto, I. Sheikin, and J. A. MydoshThe tetragonal compound UPt2Si2 has been characterized as a moderately mass-enhanced system with an antiferromagnetic (AFM) ground state below TN=32 K. Here, we present an extensive study of the behavior in high magnetic fields. We have performed pulsed field magnetization and static field resistivi... [Phys. Rev. B 85, 054410] Published Wed Feb 08, 2012
Ground-state phase diagram of the quantum J_{1}−J_{2} model on the honeycomb lattice 2012-02-08T10:00:00-05:00 Author(s): Fabio Mezzacapo and Massimo BoninsegniWe study the ground-state phase diagram of the quantum J1−J2 model on the honeycomb lattice by means of an entangled-plaquette variational ansatz. Values of energy and relevant order parameters are computed in the range 0≤J2/J1≤1. The system displays classical order for J2/J1≲0.2 (Néel) and for J2/J... (image) [Phys. Rev. B 85, 060402] Published Wed Feb 08, 2012
Regular nanodomain vertex arrays in BiFeO_{3} single crystals 2012-02-08T10:00:00-05:00 Author(s): A. Berger, D. Hesse, A. Hähnel, M. Arredondo, and M. AlexeDomain patterns consisting of triangular nanodomains of less than 50 nm size, arranged into long regular vertex arrays separated by stripe domains, were observed by (scanning and high-resolution) transmission electron microscopy and piezoresponse force microscopy in BiFeO3 single crystals grown from... [Phys. Rev. B 85, 064104] Published Wed Feb 08, 2012
Extremal transmission through a microwave photonic crystal and the observation of edge states in a rectangular Dirac billiard 2012-02-08T10:00:00-05:00 Author(s): S. Bittner, B. Dietz, M. Miski-Oglu, and A. RichterThis paper presents experimental results on properties of waves propagating in an unbounded and a bounded photonic crystal consisting of metallic cylinders that are arranged in a triangular lattice. First, we present transmission measurements of plane waves traversing a photonic crystal. The experim... [Phys. Rev. B 85, 064301] Published Wed Feb 08, 2012
Pseudogap in the chain states of YBa_{2}Cu_{3}O_{6.6} 2012-02-08T10:00:00-05:00 Author(s): V. B. Zabolotnyy, A. A. Kordyuk, D. Evtushinsky, V. N. Strocov, L. Patthey, T. Schmitt, D. Haug, C. T. Lin, V. Hinkov, B. Keimer, B. Büchner, and S. V. BorisenkoAs established by scanning tunneling microscopy (STM), cleaved surfaces of the high-temperature superconductor YBa2Cu3O7−δ develop charge-density wave (CDW) modulations in the one-dimensional (1D) CuO chains. At the same time, no signatures of the CDW have been reported in the spectral function of t... [Phys. Rev. B 85, 064507] Published Wed Feb 08, 2012
Velocity-induced reorientation of a fast driven Abrikosov lattice 2012-02-08T10:00:00-05:00 Author(s): S. Okuma, D. Shimamoto, and N. KokuboFrom mode-locking measurements where the vortex lattice is driven quickly by superimposed dc and ac currents, we find a velocity-induced rotation of lattice orientation from a perpendicular to a parallel orientation. This is a dynamic transition caused by increased velocity. At the threshold of the ... [Phys. Rev. B 85, 064508] Published Wed Feb 08, 2012
Influence of Coulomb interaction on the Aharonov-Bohm effect in an electronic Fabry-Pérot interferometer 2012-02-08T10:00:00-05:00 Author(s): Stéphane Ngo Dinh and Dmitry A. BagretsWe study the role of Coulomb interaction in an electronic Fabry-Pérot interferometer (FPI) realized with chiral edge states in the integer quantum Hall regime in the limit of weak backscattering. Assuming that a compressible Coulomb island in a bulk region of the FPI is formed, we develop a capacita... [Phys. Rev. B 85, 073403] Published Wed Feb 08, 2012
Decoherence-induced conductivity in the discrete one-dimensional Anderson model: A novel approach to even-order generalized Lyapunov exponents 2012-02-08T10:00:00-05:00 Author(s): Matías Zilly, Orsolya Ujsághy, Marko Woelki, and Dietrich E. WolfA recently proposed statistical model for the effects of decoherence on electron transport manifests a decoherence-driven transition from quantum-coherent localized to Ohmic behavior when applied to the one-dimensional Anderson model. Here we derive the resistivity in the Ohmic case and show that th... [Phys. Rev. B 85, 075110] Published Wed Feb 08, 2012
Exciton binding energies in chalcopyrite semiconductors 2012-02-08T10:00:00-05:00 Author(s): Bernard Gil, Didier Felbacq, and Shigefusa F. ChichibuThe optical spectra of Cu-III-VI2 chalcopyrite compounds display rich excitonic features in the fundamental direct bandgap energy region. The energy structure of excited excitonic states reported in the literature are reexamined using a calculation of the eigenstates of the hydrogenic problem in the... [Phys. Rev. B 85, 075205] Published Wed Feb 08, 2012
Curvature effects on valley splitting and degeneracy lifting: Case of Si/Ge rolled-up nanotubes 2012-02-08T10:00:00-05:00 Author(s): Giovanni Pizzi, Michele Virgilio, Giuseppe Grosso, Suwit Kiravittaya, and Oliver G. SchmidtWe numerically investigate electronic states, degeneracy lifting, and valley splitting in the conduction band of rolled-up Si/Ge nanotubes. Results are derived from a tight-binding model where the input equilibrium positions of the atoms are obtained by means of continuum elasticity theory. We find ... [Phys. Rev. B 85, 075308] Published Wed Feb 08, 2012
Carrier confinement in Ge/Si quantum dots grown with an intermediate ultrathin oxide layer 2012-02-08T10:00:00-05:00 Author(s): V. Kuryliuk, O. Korotchenkov, and A. CantareroWe present computational results for strain effects on charge carrier confinement in GexSi1−x quantum dots (QDs) grown on an oxidized Si surface. The strain and free carrier probability density distributions are obtained using the continuum elasticity theory and the effective-mass approximation impl... [Phys. Rev. B 85, 075406] Published Wed Feb 08, 2012
Rashba effect in type-II resonant tunneling diodes enhanced by in-plane magnetic fields 2012-02-08T10:00:00-05:00 Author(s): J. Silvano de Sousa and J. SmolinerIn this paper, we adapt the transfer matrix method to calculate the current-voltage curves of type-II GaAsSb/InGaAs resonant tunneling diodes on which a huge Rashba splitting of the current resonances has been reported recently. It is shown that, in transverse magnetic fields, the k∥ distribution of... [Phys. Rev. B 85, 085303] Published Wed Feb 08, 2012
Physisorption of benzene on a tin dioxide surface: van der Waals interaction 2012-02-08T10:00:00-05:00 Author(s): Matti Viitala, Mikael Kuisma, and Tapio T. RantalaAn adsorption study of the benzene molecule on SnO2 (110) surfaces with the density functional theory is extended to include the van der Waals interaction. We compare adsorption onto two model surfaces of SnO2, oxygen rich (stoichiometric) and oxygen poor (reduced), considered as limiting cases of v... [Phys. Rev. B 85, 085412] Published Wed Feb 08, 2012
Electronic structure and magnetic properties of metallocene multiple-decker sandwich nanowires 2012-02-08T10:00:00-05:00 Author(s): C. Morari, H. Allmaier, F. Beiuşeanu, T. Jurcuţ, and L. ChioncelWe present a study of the electronic and magnetic properties of the multiple-decker sandwich nanowires (CP-M) composed of cyclopentadienyl (CP) rings and 3d transition-metal atoms (M = Ti to Ni) using first-principles techniques. We demonstrate using density functional theory that structural relaxat... [Phys. Rev. B 85, 085413] Published Wed Feb 08, 2012 |
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