Condensed Matter

Exciton-phonon coupling in individual ZnTe nanorods studied by resonant Raman spectroscopy

Q. Zhang, J. Zhang, M. I. B. Utama, B. Peng, M. de la Mata et al.
The exciton-phonon coupling in high-quality cubic phase zinc telluride (ZnTe) nanorods (NRs) is investigated by resonant micro-Raman spectroscopy near the direct bandgap of ZnTe. The scattering cross section of longitudinal optical (LO) phonon is enhanced significantly in the resonant process, where ... [Phys. Rev. B 85, 085418 ] published .

Observation of linear solid-solid phase transformation in silicon nanoparticles

Kevin Mantey, Aiping Zhu, Jack Boparai, Munir Nayfeh, Charles Marsh et al.
In bulk single-crystal silicon, the semiconducting diamond-to-metallic ss-Sn phase transformation nucleates on defects, and is manifested by a sharp uptake in light absorption at a threshold of ~11 Gpa, accompanied with the creation of nanosized (2050 nm) fragmentation domains. We report on the obse ... [Phys. Rev. B 85, 085417 ] published .

Evidence for the formation of quasibound states in an asymmetrical quantum point contact

Phillip M. Wu, Peng Li, Hao Zhang, and A. M. Chang
Features below the first conductance plateau in ballistic quantum point contacts (QPCs) are often ascribed to electron interaction and spin effects within the single mode limit. In QPCs with a highly asymmetric geometry, we observe sharp resonance peaks when the point contacts are gated to the singl ... [Phys. Rev. B 85, 085305 ] published .

Isospin of topological defects in Dirac systems

Igor F. Herbut
We study the Dirac quasiparticles in d-dimensional lattice systems of electrons in the presence of domain walls (d=1), vortices (d=2), or hedgehogs (d=3) of superconducting and/or insulating, order parameters, which appear as mass terms in the Dirac equation. Such topological defects have been known ... [Phys. Rev. B 85, 085304 ] published .

Fermi surface reconstruction in CeTe induced by charge density waves investigated via angle resolved photoemission

J.-S. Kang, D. H. Kim, H. J. Lee, Jihoon Hwang, Han-Koo Lee et al.
Electronic structures of a charge-density wave (CDW) system CeTeSb (x=0, 0.05) have been investigated by employing angle-resolved photoemission spectroscopy (ARPES) and the first-principles electronic and phonon band-structure methods. The observed Fermi surface (FS) agrees very well with the calcul ... [Phys. Rev. B 85, 085104 ] published .

Strain dependence of bonding and hybridization across the metal-insulator transition of VO

J. Laverock, L. F. J. Piper, A. R. H. Preston, B. Chen, J. McNulty et al.
Soft x-ray spectroscopy is used to investigate the strain dependence of the metal-insulator transition of VO. Changes in the strength of the V 3dO 2p hybridization are observed across the transition and are linked to the structural distortion. Furthermore, although the V-V dimerization is well descr ... [Phys. Rev. B 85, 081104 ] published .

Ohmic electromechanical dissipation in nanomechanical cantilevers

T. Barois, A. Ayari, A. Siria, S. Perisanu, P. Vincent et al.
We study the contribution of ohmic dissipation to the mechanical damping of nanoresonators. This damping occurs when DC voltage is applied to a resistive resonator, because the mechanical motion modifies the associated capacitance, thus inducing a dissipative current. Silicon carbide nanowire resona ... [Phys. Rev. B 85, 075407 ] published .

Resonant polaron-assisted tunneling of strongly interacting electrons through a single-level vibrating quantum dot

Gleb A. Skorobagatko
The problem of resonant transport of strongly interacting electrons through a one-dimensional single-level vibrating quantum dot is being considered. In this paper, we generalize the Komnik and Gogolin model [Phys. Rev. Lett. 90, 246403 (2003)] for the single-electron transistor with g=1/2 Luttinger ... [Phys. Rev. B 85, 075310 ] published .

Energy relaxation at quantum Hall edge

Ivan P. Levkivskyi and Eugene V. Sukhorukov
In this work, we address the recent experiments [C. Altimiras et al., Nat. Phys. 6, 34 (2010); H. le Sueur et al., Phys. Rev. Lett. 105, 056803 (2010);C. Altimiras et al., Phys. Rev. Lett. 105, 226804 (2010)], where an electron distribution function at the quantum Hall (QH) edge at filling factor nu ... [Phys. Rev. B 85, 075309 ] published .

Quantum criticality of the sub-Ohmic spin-boson model

Stefan Kirchner, Kevin Ingersent, and Qimiao Si
We revisit the critical behavior of the sub-Ohmic spin-boson model. Analysis of both the leading and subleading terms in the temperature dependence of the inverse static local spin susceptibility at the quantum critical point, calculated using a numerical renormalization-group method, provides evide ... [Phys. Rev. B 85, 075113 ] published .

Thermoelectric properties of the electron-doped perovskites SrCaTiNbO

J. Fukuyado, K. Narikiyo, M. Akaki, H. Kuwahara, and T. Okuda
We have investigated thermoelectric (TE) properties for single crystals of perovskites SrCaTiNbO for 0 <= x <= 0.4 and 0 <= y <= 0.03 below room temperature (RT). We found that SrTiNbO shows a large power factor at low temperature (PF=50 [mu]W/K cm at 100 K ~ 90 [mu]W/K cm at 50 K) and the largest d ... [Phys. Rev. B 85, 075112 ] published .

Reply to Comment on `Rapid chemical and topological ordering in supercooled liquid CuZr'

V. Wessels, A. K. Gangopadhyay, K. K. Sahu, R. W. Hyers, S. M. Canepari et al.
The criticisms of Harvey and Gheribi (HG) are directed towards supporting evidence for ordering in supercooled CuZr liquid from specific heat measurements and molecular dynamics simulations, not on the direct evidence that came from x-ray diffraction studies. In this reply, we demonstrate that the u ... [Phys. Rev. B 85, 066102 ] published .

Comment on Rapid chemical and topological ordering in supercooled liquid CuZr

J.-P. Harvey and A. E. Gheribi
In their recent publication, Wessels et al. [Phys. Rev. B 83, 094116 (2011)] present evidence of rapid ordering in a supercooled CuZr liquid. A part of their supporting argument is based on an experimentally observed peak in the specific heat capacity of a CuZr melt as a function of temperature. The ... [Phys. Rev. B 85, 066101 ] published .

Probing grain boundary sink strength at the nanoscale: Energetics and length scales of vacancy and interstitial absorption by grain boundaries in alpha-Fe

M. A. Tschopp, K. N. Solanki, F. Gao, X. Sun, M. A. Khaleel et al.
The energetics and length scales associated with the interaction between point defects (vacancies and self-interstitial atoms) and grain boundaries in bcc Fe was explored. Molecular statics simulations were used to generate a grain boundary structure database that contained [approximate]170 grain bo ... [Phys. Rev. B 85, 064108 ] published .

EXAFS evidence for a primary Zn dopant in LiNbO

F. Bridges, J. Castillo-Torres, B. Car, S. Medling, and M. Kozina
We present extended x-ray-absorption fine structure (EXAFS) data as a function of temperature (10300 K) at the Zn and Nb K edges for Zn-doped LiNbO. The focus is on higher Zn concentrations (711 mol %) for which there is disagreement in the literature as to the substitution site for Zn. Our data sho ... [Phys. Rev. B 85, 064107 ] published .

Atomistic modeling of As diffusion in ZnO

B. Puchala and D. Morgan
Ab initio methods are used to predict the diffusion coefficient of As dopants in ZnO as a function of Fermi level. Contributions to As diffusion from interstitial, simple substitutional, and cluster diffusion are considered. Formation and migration energies for Zn vacancies (V), As substituting on Z ... [Phys. Rev. B 85, 064106 ] published .

Determination of spin pumping as a source of linewidth in sputtered CoFe/Pd multilayers by use of broadband ferromagnetic resonance spectroscopy

Justin M. Shaw, Hans T. Nembach, and T. J. Silva
We performed a systematic study of damping in CoFe/Pd multilayers by use of broadband (160 GHz) ferromagnetic resonance (FMR) spectroscopy in the perpendicular geometry. The data were fitted with the conventional Landau-Lifshitz equation in conjunction with an inhomogeneous contribution to linewidth ... [Phys. Rev. B 85, 054412 ] published .

Heat flow in nanostructures in the Casimir regime

Humphrey J. Maris and Shin-ichiro Tamura
In small structures the phonon mean free path due to phonon-phonon interactions and defect scattering may exceed the sample dimensions. The thermal conductivity then becomes dependent on the size and shape of the sample. In this article we present calculations of the conductivity under these conditi ... [Phys. Rev. B 85, 054304 ] published .

Examining the structure and bonding in complex oxides using aberration-corrected imaging and spectroscopy

R. F. Klie, Q. Qiao, T. Paulauskas, Q. Ramasse, M. P. Oxley et al.
Our ability to directly characterize the atomic and electronic structures is crucial to developing a fundamental understanding of structure-property relationships in complex-oxide materials. Here, we examine one specific example, the misfit-layered thermoelectric material CaCoO, which exhibits a hig ... [Phys. Rev. B 85, 054106 ] published .

Metal-dielectric-metal surface plasmon-polariton resonators

Anu Chandran, Edward S. Barnard, Justin S. White, and Mark L. Brongersma
A theoretical study of standing-wave resonances of surface plasmon polaritons (SPPs) in finite-length metal-dielectric-metal cavities is presented. A Fabry-Perot 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 .

Tunneling transport through superconducting wires with Majorana bound states

B. H. Wu and J. C. Cao
We 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 .

Symmetry-protected topological phases in noninteracting fermion systems

Xiao-Gang Wen
Symmetry-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 (T-hat), charge conjugation (C), and/or U(1) (N-hat) sy ... [Phys. Rev. B 85, 085103 ] published .

Magnetic properties of the doped spin-(1/2) honeycomb-lattice compound InCuVO

Y. J. Yan, Z. Y. Li, T. Zhang, X. G. Luo, G. J. Ye et al.
We report magnetic properties in the Co- and Zn-doped spin-1/2 honeycomb-lattice compound InCuVO. Magnetic susceptibility and specific heat experiments show no long-range ordering down to 2 K in InCuVO. Analyses of electronic structures and states suggest that the ground state of undoped InCuVO is p ... [Phys. Rev. B 85, 085102 ] published .

Hole spin relaxation and coefficients in Landau-Lifshitz-Gilbert equation in ferromagnetic (Ga,Mn)As

K. Shen and M. W. Wu
We 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 .

Competing orders in the Dirac-like electronic structure and the nonlinear sigma model with a topological term

Pouyan Ghaemi and Shinsei Ryu
The 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 com ... [Phys. Rev. B 85, 075111 ] published .

Interplay of Aharonov-Bohm, chirality, and aspect-ratio effects in the axial conductance of a nanotube

Eugene B. Kolomeisky, Hussain Zaidi, and Joseph P. Straley
A 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 .

Quarter-filled honeycomb lattice with a quantized Hall conductance

Ganpathy Murthy, Efrat Shimshoni, R. Shankar, and H. A. Fertig
We 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 .

Reconstructing the bulk Fermi surface and superconducting gap properties from neutron scattering experiments

Tanmoy Das, R. S. Markiewicz, and A. Bansil
We 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 .

Magnetic-field tuned anisotropy in superconducting RbFeSe

S. Bosma, R. Puzniak, A. Krzton-Maziopa, M. Bendele, E. Pomjakushina et al.
The anisotropic superconducting properties of a RbFeSe single crystal with T~=32 K were investigated by means of superconducting quantum interference device (SQUID) and torque magnetometry, probing the effective magnetic penetration depth lambda and the magnetic penetration depth anisotropy gamma. I ... [Phys. Rev. B 85, 064509 ] published .

Systematic study of ferroelectric, interfacial, oxidative, and doping effects on conductance of Pt/BaTiO/Pt ferroelectic tunnel junctions

Lei Shen (沈雷), Tiejun Zhou, Zhaoqiang Bai, Minggang Zeng, Jing Qiang Goh et al.
Using 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 BaTiO-based ferroelectric tunnel junctions (Pt/BaTiO/Pt). The ferroelectric effect reduces the tunn ... [Phys. Rev. B 85, 064105 ] published .

Phase transitions in spin-orbital models with spin-space anisotropies for iron pnictides: Monte Carlo simulations

Ryan Applegate, Rajiv R. P. Singh, Cheng-Chien Chen, and Thomas P. Devereaux
The 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 .

Phonon Raman scattering of RCrO perovskites (R=Y, La, Pr, Sm, Gd, Dy, Ho, Yb, Lu)

M. C. Weber, J. Kreisel, P. A. Thomas, M. Newton, K. Sardar et al.
We report a systematic investigation of orthorhombic perovskite-type RCrO powder samples by Raman scattering for nine different rare earth R 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 st ... [Phys. Rev. B 85, 054303 ] published .

Structural transformation and vibrational properties of BaC at high pressure

I. Efthimiopoulos, K. Kunc, G. V. Vazhenin, E. Stavrou, K. Syassen et al.
We show that the ambient-pressure tetragonal phase of BaC (CaC-type, space group I4/mmm), with sixfold coordination of Ba atoms and C dumbbells, transforms reversibly to a new structure type at 4 GPa; it is an eight-coordinated rhombohedral modification (space group R[overline 3]m), which can be vie ... [Phys. Rev. B 85, 054105 ] published .

Thermodynamics, spin-charge separation, and correlation functions of spin-1/2 fermions with repulsive interaction

J. Y. Lee, X. W. Guan, K. Sakai, and M. T. Batchelor
We investigate the low-temperature thermodynamics and correlation functions of one-dimensional spin-1/2 fermions with strong repulsion in an external magnetic field via the thermodynamic Bethe ansatz method. The exact thermodynamics of the model in a weak magnetic field is derived with the help of W ... [Phys. Rev. B 85, 085414 ] published .

Electronic structure and magnetic properties of metallocene multiple-decker sandwich nanowires

C. Morari, H. Allmaier, F. Beiuşeanu, T. Jurcut, and L. Chioncel
We 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 .

Physisorption of benzene on a tin dioxide surface: van der Waals interaction

Matti Viitala, Mikael Kuisma, and Tapio T. Rantala
An adsorption study of the benzene molecule on SnO (110) surfaces with the density functional theory is extended to include the van der Waals interaction. We compare adsorption onto two model surfaces of SnO, oxygen rich (stoichiometric) and oxygen poor (reduced), considered as limiting cases of var ... [Phys. Rev. B 85, 085412 ] published .

Rashba effect in type-II resonant tunneling diodes enhanced by in-plane magnetic fields

J. Silvano de Sousa and J. Smoliner
In 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 .

Carrier confinement in Ge/Si quantum dots grown with an intermediate ultrathin oxide layer

V. Kuryliuk, O. Korotchenkov, and A. Cantarero
We present computational results for strain effects on charge carrier confinement in GeSi 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 implemen ... [Phys. Rev. B 85, 075406 ] published .

Curvature effects on valley splitting and degeneracy lifting: Case of Si/Ge rolled-up nanotubes

Giovanni Pizzi, Michele Virgilio, Giuseppe Grosso, Suwit Kiravittaya, and Oliver G. Schmidt
We 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 .

Exciton binding energies in chalcopyrite semiconductors

Bernard Gil, Didier Felbacq, and Shigefusa F. Chichibu
The optical spectra of Cu-III-VI 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 .

Decoherence-induced conductivity in the discrete one-dimensional Anderson model: A novel approach to even-order generalized Lyapunov exponents

Matias Zilly, Orsolya Ujsaghy, Marko Woelki, and Dietrich E. Wolf
A 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 .

Influence of Coulomb interaction on the Aharonov-Bohm effect in an electronic Fabry-Perot interferometer

Stephane Ngo Dinh and Dmitry A. Bagrets
We study the role of Coulomb interaction in an electronic Fabry-Perot 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 .

Velocity-induced reorientation of a fast driven Abrikosov lattice

S. Okuma, D. Shimamoto, and N. Kokubo
From 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 .

Pseudogap in the chain states of YBaCuO

V. B. Zabolotnyy, A. A. Kordyuk, D. Evtushinsky, V. N. Strocov, L. Patthey et al.
As established by scanning tunneling microscopy (STM), cleaved surfaces of the high-temperature superconductor YBaCuO 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 the ch ... [Phys. Rev. B 85, 064507 ] published .

Extremal transmission through a microwave photonic crystal and the observation of edge states in a rectangular Dirac billiard

S. Bittner, B. Dietz, M. Miski-Oglu, and A. Richter
This 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 .

Regular nanodomain vertex arrays in BiFeO single crystals

A. Berger, D. Hesse, A. Hahnel, M. Arredondo, and M. Alexe
Domain 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 BiFeO single crystals grown from ... [Phys. Rev. B 85, 064104 ] published .

Ground-state phase diagram of the quantum JJ model on the honeycomb lattice

Fabio Mezzacapo and Massimo Boninsegni
We study the ground-state phase diagram of the quantum JJ 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<=J/J<=1. The system displays classical order for J/J<~0.2 (Neel) and for J/J>~0.4 ... [Phys. Rev. B 85, 060402 ] published .

Field-induced phases in UPtSi

D. Schulze Grachtrup, M. Bleckmann, B. Willenberg, S. Sullow, M. Bartkowiak et al.
The tetragonal compound UPtSi has been characterized as a moderately mass-enhanced system with an antiferromagnetic (AFM) ground state below T=32 K. Here, we present an extensive study of the behavior in high magnetic fields. We have performed pulsed field magnetization and static field resistivity ... [Phys. Rev. B 85, 054410 ] published .

Ground-state characterizations of systems predicted to exhibit L1 or L1 crystal structures

Lance J. Nelson, Gus L. W. Hart, and Stefano Curtarolo
Despite their geometric simplicity, the crystal structures L1 (CuPt) and L1 (CdPt) 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 synergy ... [Phys. Rev. B 85, 054203 ] published .

Brillouin scattering studies of acoustic phonon modes and central peak in single-crystal Pb(ScTa)O

V. Sivasubramanian and S. Kojima
Brillouin spectra measurements have been carried out from 800 to 100 K for Pb(ScTa)O 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 gradual incr ... [Phys. Rev. B 85, 054104 ] published .

Interwall screening and excitons in double-wall carbon nanotubes

Yuh Tomio, Hidekatsu Suzuura, and Tsuneya Ando
Exciton properties of double-wall carbon nanotubes are studied in the static screened Hartree-Fock approximation within a kp scheme. The intrawall electron-hole interaction is largely suppressed by interwall screening effects. The suppression is sensitive to the effective interwall distance between ... [Phys. Rev. B 85, 085411 ] published .

Accurate description of charge transport in organic field effect transistors using an experimentally extracted density of states

W. S. C. Roelofs, S. G. J. Mathijssen, R. A. J. Janssen, D. M. de Leeuw, and M. Kemerink
The width and shape of the density of states (DOS) are key parameters to describe the charge transport of organic semiconductors. Here we extract the DOS using scanning Kelvin probe microscopy on a self-assembled monolayer field effect transistor (SAMFET). The semiconductor is only a single monolaye ... [Phys. Rev. B 85, 085202 ] published .

Lattice instability and elastic dispersion due to the rattling motion in the type-I clathrate BaGaSn

Isao Ishii, Yasuhiko Suetomi, Takahiro K. Fujita, Koichiro Suekuni, Tomoo Tanaka et al.
To investigate the off-center rattling motion and its charge-carrier dependence in type-I clathrate compounds, we carried out ultrasonic measurements on type-I BaGaSn and a reference compound, KGaSn. We found elastic softening of C originating from a lattice instability due to the off-center rattlin ... [Phys. Rev. B 85, 085101 ] published .

Full configuration interaction perspective on the homogeneous electron gas

James J. Shepherd, George Booth, Andreas Gruneis, and Ali Alavi
Highly accurate results for the homogeneous electron gas (HEG) have only been achieved to date within a diffusion Monte Carlo (DMC) framework. Here, we introduce a recently developed stochastic technique, full configuration interaction quantum Monte Carlo (FCIQMC), which samples the exact wave funct ... [Phys. Rev. B 85, 081103 ] published .

Number of observable features in the acoustic Raman spectra of nanocrystals

Lucien Saviot, Nicolas Combe, and Adnen Mlayah
Low-frequency Raman-scattering spectra are presented for gold nanocrystals with diameters 3.5 and 13 nm. The frequencies of the Raman peaks but also their number are shown to vary with the nanocrystal size. These results are analyzed using both the continuous elastic medium approximation and an atom ... [Phys. Rev. B 85, 075405 ] published .

Semiclassical theory of magnetoresistance in positionally disordered organic semiconductors

N. J. Harmon and M. E. Flatte
A recently introduced percolative theory of unipolar organic magnetoresistance is generalized by treating the hyperfine interaction semiclassically for an arbitrary hopping rate. Compact analytic results for the magnetoresistance are achievable when carrier hopping occurs much more frequently than t ... [Phys. Rev. B 85, 075204 ] published .

Multivalley spin relaxation in n-type bulk GaAs in the presence of high electric fields

H. Tong and M. W. Wu
Multivalley spin relaxation in n-type bulk GaAs in the presence of high electric field is investigated from the microscopic kinetic spin Bloch equation approach with the Gamma and L valleys included. We show that the spin relaxation time decreases monotonically with the electric field, which differs ... [Phys. Rev. B 85, 075203 ] published .

Vacuum space-charge effects in nano-ARPES

S. Hellmann, T. Ott, L. Kipp, and K. Rossnagel
Angle-resolved photoemission spectroscopy (ARPES) provides a powerful tool for probing the spatially averaged electronic structure of condensed matter at high energy and momentum resolution. Current efforts to add spatial resolution by reducing the focal spot size of the incident radiation to the na ... [Phys. Rev. B 85, 075109 ] published .

Hole depletion of ladders in SrCuO induced by correlation effects

V. Ilakovac, C. Gougoussis, M. Calandra, N. B. Brookes, V. Bisogni et al.
The hole distribution in SrCuO is studied by low-temperature polarization-dependent O K near-edge x-ray absorption fine-structure measurements and state-of-the-art electronic structure calculations that include core-hole and correlation effects in a mean-field approach. Contrary to all previous anal ... [Phys. Rev. B 85, 075108 ] published .

Ground-state degeneracy in the Levin-Wen model for topological phases

Yuting Hu, Spencer D. Stirling, and Yong-Shi Wu
We study the properties of topological phases by calculating the ground-state degeneracy (GSD) of the two-dimensional Levin-Wen (LW) model. Here it is explicitly shown that the GSD depends only on the spatial topology of the system. Then we show that the ground state on a sphere is always nondegener ... [Phys. Rev. B 85, 075107 ] published .

Extended dual description of Mott transition beyond two-dimensional space

Yin Zhong, Ke Liu, and Hong-Gang Luo
Motivated by the recent paper of Mross and Senthil [Phys. Rev. B 84, 165126 (2011)], which provides a dual description for a Mott transition from a Fermi liquid to a quantum-spin liquid in two space dimensions, we extend their approach to higher-dimensional cases, and we provide explicit formalism i ... [Phys. Rev. B 85, 075106 ] published .

Image charge dynamics in time-dependent quantum transport

Petri Myohanen, Riku Tuovinen, Topi Korhonen, Gianluca Stefanucci, and Robert van Leeuwen
In this work, we investigate the effects of the electron-electron interaction between a molecular junction and the metallic leads in time-dependent quantum transport. We employ the recently developed embedded Kadanoff-Baym method [Phys. Rev. B 80, 115107 (2009)] and show that the molecule-lead inter ... [Phys. Rev. B 85, 075105 ] published .

Magnetic field dependence of the quantum tunneling of normal-superconductor interfaces in a type-I Pb superconductor

Saul Velez, Ricardo Zarzuela, Antoni Garcia-Santiago, and Javier Tejada
We report experimental evidence of the effect of an applied magnetic field on the nonthermal magnetic relaxation in a disk-shaped type-I lead superconductor. The time evolution of the irreversible magnetization proves to be logarithmic for a wide range of temperatures and magnetic field values along ... [Phys. Rev. B 85, 064506 ] published .

Domain structure and magnetic pinning in ferromagnetic/superconducting hybrids

V. Vlasko-Vlasov, A. Buzdin, A. Melnikov, U. Welp, D. Rosenmann et al.
Magnetic patterns in three iron-garnet films with different magnetic properties covered with 100-nm superconducting Nb film are studied using a magneto-optical imaging technique. In all samples the strong coupling between ferromagnetic domains and vortices noticeably modifies the magnetization proce ... [Phys. Rev. B 85, 064505 ] published .

Shear modulus of an elastic solid under external pressure as a function of temperature: The case of helium

Felipe Barra, Fernando Lund, Nicolas Mujica, and Sergio Rica
The energy of a dislocation loop in a continuum elastic solid under pressure is considered within the framework of classical mechanics. For a circular loop, this is a function with a maximum at pressures that are well within reach of experimental conditions for solid helium, suggesting, in this case ... [Phys. Rev. B 85, 064103 ] published .

Structure of a 2 (010) Cu twist boundary interface and the segregation of vacancies and He atoms

Enrique Martinez, John P. Hirth, Michael Nastasi, and Alfredo Caro
A 2 (010) Cu twist boundary is characterized by two sets of (1/2) screw dislocations crossing at misfit dislocation intersections (MDIs). Molecular dynamics simulations show that between MDIs, dislocations split into the two possible {111} planes that share the direction, forming a constriction whe ... [Phys. Rev. B 85, 060101 ] published .

Effects of magnetic field, anisotropy, and biquadratic interactions in type-IIA fcc antiferromagnets studied by linear spin-wave theory

Trinanjan Datta and Dao-Xin Yao
We study the spin dynamics in a 3D quantum antiferromagnet on a face-centered-cubic (fcc) lattice. The effects of magnetic field, single-ion anisotropy, and biquadratic interactions are investigated using linear spin-wave theory with spins in a canted basis about the type-IIA fcc antiferromagnetic g ... [Phys. Rev. B 85, 054409 ] published .

Critical temperature and correlation length of an elastic interaction model for spin-crossover materials

Taro Nakada, Takashi Mori, Seiji Miyashita, Masamichi Nishino, Synge Todo et al.
It has previously been pointed out that the coexistence of infinite-range and short-range interactions causes a system to have a phase transition of the mean-field universality class, in which the cluster size is finite even at the critical point. In the present paper, we study this property in a mo ... [Phys. Rev. B 85, 054408 ] published .

First-principles study of structural, magnetic, and electronic properties of small Fe-Rh alloy clusters

Junais Habeeb Mokkath and G. M. Pastor
The structural, electronic, and magnetic properties of small FeRh clusters having N=m+n<=8 atoms are studied in the framework of a generalized-gradient approximation to density-functional theory. For N=m+n<=6, a thorough sampling of all cluster topologies has been performed, while for N=7 and 8, onl ... [Phys. Rev. B 85, 054407 ] published .

First-principles calculation of phase equilibrium of V-Nb, V-Ta, and Nb-Ta alloys

C. Ravi, B. K. Panigrahi, M. C. Valsakumar, and Axel van de Walle
In this paper, we report the calculated phase diagrams of V-Nb, V-Ta, and Nb-Ta alloys computed by combining the total energies of 4050 configurations for each system (obtained using density functional theory) with the cluster expansion and Monte Carlo techniques. For V-Nb alloys, the phase diagram ... [Phys. Rev. B 85, 054202 ] published .

van der Waals density functional study of CO binding in zeolitic imidazolate frameworks

Keith G. Ray, David Olmsted, Ning He, Yao Houndonougbo, Brian B. Laird et al.
The van der Waals density functional (vdW-DF) formalism is employed in a study of the binding energetics for CO in a set of five zeolitic imidazolate framework (ZIF) compounds. The ZIF structures investigated share the same RHO-type zeolite topology and metal atoms, but feature imidazolate linkers w ... [Phys. Rev. B 85, 085410 ] published .

Green's function method for line defects and gapless modes in topological insulators: Beyond the semiclassical approach

Ken Shiozaki and Satoshi Fujimoto
Defects that appear in heterostructure junctions involving topological insulators are sources of gapless modes governing the low-energy properties of the systems, as recently elucidated by Teo and Kane [Phys. Rev. B 82, 115120 (2010)]. A standard approach for the calculation of topological invariant ... [Phys. Rev. B 85, 085409 ] published .

Semiconductor qubits based on fluorine implanted ZnMgSe/ZnSe quantum-well nanostructures

Y. M. Kim, D. Sleiter, K. Sanaka, Y. Yamamoto, J. Meijer et al.
It has been shown that the excitons bound to individual donors in epitaxially grown ZnMgSe/ZnSe quantum-well (QW) nanostructures provide suitable single-photon sources and optically controllable qubits for quantum information technology. Here we demonstrate ion implantation as an alternative fluorin ... [Phys. Rev. B 85, 085302 ] published .

Giant negative magnetoresistance in high-mobility two-dimensional electron systems

A. T. Hatke, M. A. Zudov, J. L. Reno, L. N. Pfeiffer, and K. W. West
We report on a giant negative magnetoresistance in very high mobility GaAs/AlGaAs heterostructures and quantum wells. The effect is the strongest at B~=1 kG, where the magnetoresistivity develops a minimum emerging at T<~2 K. Unlike the zero-field resistivity which saturates at T~=2 K, the resistivi ... [Phys. Rev. B 85, 081304 ] published .

Exciton acoustic-phonon coupling in single GaN/AlN quantum dots

Irina A. Ostapenko, Gerald Honig, Sven Rodt, Andrei Schliwa, Axel Hoffmann et al.
Coupling of acoustic phonons to excitons in single wurtzite-type GaN/AlN quantum dots is investigated in detail by cathodoluminescence experiments and compared to theory. Numerical simulations of the coupling in the framework of the independent Boson model with realistic wave functions based on 8-ba ... [Phys. Rev. B 85, 081303 ] published .

Higher-order contributions to the Rashba-Bychkov effect with application to the Bi/Ag(111) surface alloy

Sz. Vajna, E. Simon, A. Szilva, K. Palotas, B. Ujfalussy et al.
In order to explain the anisotropic Rashba-Bychkov effect observed in several metallic-surface-state systems, we use kp perturbation theory with a simple group-theoretical analysis and construct effective Rashba Hamiltonians for different point groups up to third order in the wave number. We perform ... [Phys. Rev. B 85, 075404 ] published .

Capillary condensation, freezing, and melting in silica nanopores: A sorption isotherm and scanning calorimetry study on nitrogen in mesoporous SBA-15

Sebastian T. Moerz, Klaus Knorr, and Patrick Huber
Condensation, melting, and freezing of nitrogen in a powder of mesoporous silica grains (SBA-15) has been studied by combined volumetric sorption isotherm and scanning calorimetry measurements. Within the mean-field model of Saam and Cole for vapor condensation in cylindrical pores, a liquid nitroge ... [Phys. Rev. B 85, 075403 ] published .

Ionization of coherent excitons by strong terahertz fields

B. Ewers, N. S. Koster, R. Woscholski, M. Koch, S. Chatterjee et al.
The interaction of coherent excitons with intense, single-cycle terahertz (THz) pulses is investigated. A significant bleaching of the 1s-exciton resonance develops into a splitting of the absorption peak and the emergence of pronounced wings with increasing THz field strength. A quantum-mechanical ... [Phys. Rev. B 85, 075307 ] published .

Time-dependent transport of electrons through a photon cavity

Vidar Gudmundsson, Olafur Jonasson, Chi-Shung Tang, Hsi-Sheng Goan, and Andrei Manolescu
We use a non-Markovian master equation to describe the transport of Coulomb-interacting electrons through an electromagnetic cavity with one quantized photon mode. The central system is a finite-parabolic quantum wire that is coupled weakly to external parabolic quasi-one-dimensional leads at t=0. W ... [Phys. Rev. B 85, 075306 ] published .

Structural origins of intrinsic stress in amorphous silicon thin films

Eric Johlin, Nouar Tabet, Sebastian Castro-Galnares, Amir Abdallah, Mariana I. Bertoni et al.
Hydrogenated amorphous silicon (a-Si:H) refers to a broad class of atomic configurations, sharing a lack of long-range order, but varying significantly in material properties, including optical constants, porosity, hydrogen content, and intrinsic stress. It has long been known that deposition condit ... [Phys. Rev. B 85, 075202 ] published .

Resonant modulational instability and self-induced transmission effects in semiconductors: Maxwell-Bloch formalism

Oleksii A. Smyrnov and Fabio Biancalana
The nonlinear optical properties of semiconductors near an excitonic resonance are investigated theoretically by using the macroscopic J model [Ostreich and Knorr, Phys. Rev. B 48, 17811 (1993); and ibid. 50, 5717 (1994)] based on the microscopic semiconductor Bloch equations. These nonlinear prop ... [Phys. Rev. B 85, 075201 ] published .

Coexisting pseudogap, charge-transfer-gap, and Mott-gap energy scales in the resonant inelastic x-ray scattering spectra of electron-doped cuprate superconductors

Susmita Basak, Tanmoy Das, Hsin Lin, M. Z. Hasan, R. S. Markiewicz et al.
We present a computation of Cu K-edge resonant inelastic x-ray scattering (RIXS) spectra for electron-doped cuprates, which includes coupling to bosonic fluctuations. Comparison with experiment over a wide range of energy and momentum transfers allows us to identify the signatures of three key norma ... [Phys. Rev. B 85, 075104 ] published .

Anisotropic surface coupling while sliding on dolomite and calcite crystals

Carlos M. Pina, Rodolfo Miranda, and Enrico Gnecco
High-resolution friction force microscopy has been performed on the (104) surfaces of dolomite and calcite in deionized water. The two rows of oxygen atoms alternating in a zigzag way on top of both surfaces are resolved with similar contrast while scanning along the [42[overline 1]] direction. Alon ... [Phys. Rev. B 85, 073402 ] published .

Publisher's Note: BT phase diagram of CoCrO in magnetic fields up to 14 T [Phys. Rev. B 85, 012101 (2012)]

A. V. Pronin, M. Uhlarz, R. Beyer, T. Fischer, J. Wosnitza et al.
Abstract not available. [Phys. Rev. B 85, 069901 ] published .

Structure of the oxygen-annealed chalcogenide superconductor FeTeSeO

Hefei Hu, Jian-Min Zuo, Mao Zheng, James N. Eckstein, Wan Kyu Park et al.
The as-grown single crystal FeTeSe with the tetragonal PbO-type structure is nonsuperconducting owing to the excess Fe. Superconductivity is induced after oxygen annealing with an onset and zero resistance transition temperature around 14.5 K and 11.5 K, respectively. The oxygen doping is evidenced ... [Phys. Rev. B 85, 064504 ] published .

Evidence of oxygen-dependent modulation in LuFeO

J. Bourgeois, M. Hervieu, M. Poienar, A. M. Abakumov, E. Elkaim et al.
A polycrystalline sample of LuFeO has been investigated by means of powder synchrotron x-ray and neutron diffraction and transmission electron microscopy (TEM), along with Mossbauer spectroscopy and transport and magnetic properties. A monoclinic distortion is unambiguously evidenced, and the crysta ... [Phys. Rev. B 85, 064102 ] published .

Size-induced melting and reentrant freezing in fullerene-doped helium clusters

F. Calvo
The structural and dynamical stabilities of CHe clusters are theoretically investigated using global optimization and path-integral simulation methods. Up to N=32, the fullerene ion traps the helium atoms onto sixfold and fivefold faces, strongly enough to negate vibrational delocalization. Above th ... [Phys. Rev. B 85, 060502 ] published .

Pronounced first-order metamagnetic transition in the paramagnetic heavy-fermion system CeTiGe

M. Deppe, S. Lausberg, F. Weickert, M. Brando, Y. Skourski et al.
We report on the observation of large, steplike anomalies in the magnetization (DeltaM=0.74 [mu]/Ce), in the magnetostriction (Deltal/l=2.0 x 10), and in the magnetoresistance in polycrystals of the paramagnetic heavy-fermion system CeTiGe at a critical magnetic field [mu]H[approximate]12 T at low ... [Phys. Rev. B 85, 060401 ] published .

Publisher's Note: Infrared optical response of LuFeO under dc electric field [Phys. Rev. B 85, 014303 (2012)]

Chul Lee, JooYoun Kim, S. W. Cheong, and E. J. Choi
Abstract not available. [Phys. Rev. B 85, 059902 ] published .

Erratum: Electrical current driven by a coherent spin wave in a bulk ferromagnetic semiconductor [Phys. Rev. B 84, 012402 (2011)]

A. A. Fraerman, K. R. Muhamatchin, and I. D. Tokman
Abstract not available. [Phys. Rev. B 85, 059901 ] published .

Charge pumping by magnetization dynamics in magnetic and semimagnetic tunnel junctions with interfacial Rashba or bulk extrinsic spin-orbit coupling

Farzad Mahfouzi, Jaroslav Fabian, Naoto Nagaosa, and Branislav K. Nikolic
We develop a time-dependent nonequilibrium Green function (NEGF) approach to the problem of spin pumping by precessing magnetization in one of the ferromagnetic layers within F|I|F magnetic tunnel junctions (MTJs) or F|I|N semi-MTJs in the presence of intrinsic Rashba spin-orbit coupling (SOC) at th ... [Phys. Rev. B 85, 054406 ] published .

Cascading photoinduced, elastic, and thermal switching of spin states triggered by a femtosecond laser pulse in an Fe(III) molecular crystal

M. Lorenc, Ch. Balde, W. Kaszub, A. Tissot, N. Moisan et al.
In this paper we put on solid ground the optical time-resolved study of spin-state photoinduced switching in an Fe(III) compound whose structural dynamics have been recently unveiled. We provide the experimental evidence of complex dynamics, occurring in succession, and spanning ten decades in time. ... [Phys. Rev. B 85, 054302 ] published .

Static compression of LiH to 250 GPa

A. Lazicki, P. Loubeyre, F. Occelli, Russell J. Hemley, and M. Mezouar
The equation of state of LiH was extended to 252 GPa (V/V=32%) at room temperature using x-ray diffraction in diamond-anvil cells. LiH was shown to remain in the the NaCl (B1) structure under these conditions, and the predicted B1-B2 phase transition well known in neighboring alkali halides was not ... [Phys. Rev. B 85, 054103 ] published .

Itinerant half-metal spin-density-wave state on the hexagonal lattice. (arXiv:1202.2127v1 [cond-mat.str-el])

ePrint arXiv http://arXiv.org/

Polarizability and Screening in Chiral Multilayer Graphene. (arXiv:1202.2132v1 [cond-mat.mtrl-sci])

ePrint arXiv http://arXiv.org/

The Fermi Gases and Superfluids: Short Review of Experiment and Theory for Condensed Matter Physicists. (arXiv:1202.2146v1 [cond-mat.quant-gas])

ePrint arXiv http://arXiv.org/

Quantum state transmission in a cavity array via two-photon exchange. (arXiv:1202.2147v1 [quant-ph])

ePrint arXiv http://arXiv.org/

Reconciling the Black Hole Entropy with Classical Thermodynamics. (arXiv:1202.2154v1 [cond-mat.stat-mech])

ePrint arXiv http://arXiv.org/

The Geometry of the Vapor Layer Under a Leidenfrost Drop. (arXiv:1202.2157v1 [cond-mat.soft])

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A perspective of superconductivity as multiband phenomena: Cuprate, iron and aromatic systems. (arXiv:1202.2170v1 [cond-mat.supr-con])

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Structural diversity and the role of particle shape and dense fluid behavior in assemblies of hard polyhedra. (arXiv:1202.2177v1 [cond-mat.soft])

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Effect of photoions on the line shapes of the F\"orster resonance and microwave transitions in cold rubidium Rydberg atoms. (arXiv:1202.2182v1 [physics.atom-ph])

ePrint arXiv http://arXiv.org/

Transport properties of dense deuterium-tritium plasmas. (arXiv:1202.2186v1 [cond-mat.mtrl-sci])

ePrint arXiv http://arXiv.org/

Order-disorder transition in a model with two symmetric absorbing states. (arXiv:1202.2201v1 [cond-mat.stat-mech])

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Charge carrier localisation in disordered graphene nanoribbons. (arXiv:1202.2202v1 [cond-mat.str-el])

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