Physical Review B

Physical Review B

Recent articles in Physical Review B
Optical near-field absorption at a metal tip far from plasmonic resonance Author(s): J. Houard, A. Vella, F. Vurpillot, and B. Deconihout We investigate the wavelength and the polarization dependence of the absorption of a subwavelength tip illuminated by an ultrashort laser pulse using laser-assisted atom-probe tomography. We show that it is possible to localize the absorption at the tip apex by choosing the appropriate laser polariz... [Phys. Rev. B 81, 125411] Published Fri Mar 12, 2010 Electron-electron scattering and magnetoresistance of ballistic microcontacts Author(s): K. E. Nagaev and T. V. Kostyuchenko Using a semiclassical Boltzmann equation, we calculate corrections to the Sharvin conductance of a wide two-dimensional electron gas ballistic contact that result from an electron-electron scattering in the leads. These corrections are dominated by collisions of electrons with nearly opposite moment... [Phys. Rev. B 81, 125316] Published Fri Mar 12, 2010 Effects of screened Coulomb impurities on autoionizing two-electron resonances in spherical quantum dots Author(s): Michael Genkin and Eva Lindroth In a recent paper [Phys. Rev. B 78, 075316 (2008)], Sajeev and Moiseyev demonstrated that the bound-to-resonant transitions and lifetimes of autoionizing states in spherical quantum dots can be controlled by varying the confinement strength. In the present paper, we report that such control can in s... [Phys. Rev. B 81, 125315] Published Fri Mar 12, 2010 Carrier capture by threading dislocations in (In,Ga)N/GaN heteroepitaxial layers Author(s): U. Jahn, O. Brandt, E. Luna, X. Sun, H. Wang, D. S. Jiang, L. F. Bian, and H. Yang Using spatially resolved cathodoluminescence spectroscopy, we investigate the spatial luminescence distribution in a fully strained (In,Ga)N layer, in particular, its correlation with the distribution of threading dislocations (TDs). Regarding the impact of TDs on the luminescence properties, we can... [Phys. Rev. B 81, 125314] Published Fri Mar 12, 2010 Anisotropic spin dynamics of confined electrons in CdTe/ZnTe quantum structures Author(s): Shinichi Tomimoto, Shinsuke Nozawa, Yoshikazu Terai, Shinji Kuroda, Kôki Takita, and Yasuaki Masumoto We have studied the spin dynamics of confined electrons in an ultrathin CdTe/ZnTe quantum well and self-assembled quantum dots by time-resolved Kerr-rotation technique. The dependence of the spin-precession frequency on the magnetic field direction shows the anisotropy of the g -factor tensor, which... [Phys. Rev. B 81, 125313] Published Fri Mar 12, 2010 Models of mesoscopic time-resolved current detection Author(s): Adam Bednorz and Wolfgang Belzig Quantum transport in mesoscopic conductors is essentially governed by the laws of quantum mechanics. One of the major open questions of quantum mechanics is what happens if noncommuting observables are measured simultaneously. Since current operators at different times do not commute, the high-frequ... [Phys. Rev. B 81, 125112] Published Fri Mar 12, 2010 Discontinuous Euler instability in nanoelectromechanical systems Author(s): Guillaume Weick, Fabio Pistolesi, Eros Mariani, and Felix von Oppen We investigate nanoelectromechanical systems near mechanical instabilities. We show that, quite generally, the interaction between the electronic and the vibronic degrees of freedom can be accounted for essentially exactly when the instability is continuous. We apply our general framework to the Eul... [Phys. Rev. B 81, 121409] Published Fri Mar 12, 2010 Bulk manifestation of the spin Hall effect Author(s): Brandon Anderson, Tudor D. Stanescu, and Victor Galitski We show that an inhomogeneous spin-orbit-coupled system supports bulk manifestations of the spin Hall effect, and we develop a theory of this phenomenon in the framework of the spin diffusion equation formalism. In the presence of a spin-density wave with wave vector perpendicular to an applied elec... [Phys. Rev. B 81, 121304] Published Fri Mar 12, 2010 Effect of bending on single-walled carbon nanotubes: A Raman scattering study Author(s): Bei Wang, Awnish K. Gupta, Jun Huang, Harindra Vedala, Qingzhen Hao, Vincent H. Crespi, Wonbong Choi, and Peter C. Eklund We describe microRaman studies of serpentine single-walled carbon nanotubes grown on single-crystal quartz. Local Raman spectra were collected from bent and straight segments of the same nanotube to elucidate the effects of bending. Bending radii as large as 1–2 μm produce a measurable shift of t... [Phys. Rev. B 81, 115422] Published Fri Mar 12, 2010 Spectral gap induced by structural corrugation in armchair graphene nanoribbons Author(s): S. Costamagna, O. Hernandez, and A. Dobry We study the effects of the structural corrugation or rippling on the electronic properties of undoped armchair graphene nanoribbons (AGNRs). First, reanalyzing the single corrugated graphene layer we find that the two inequivalent Dirac points (DPs) move away from each other. Futhermore, the Fermi ... [Phys. Rev. B 81, 115421] Published Fri Mar 12, 2010 Fano-Kondo effect in side-coupled double quantum dots at finite temperatures and the importance of two-stage Kondo screening Author(s): Rok Žitko We study the zero-bias conductance through the system of two quantum dots, one of which is embedded directly between the source and drain electrodes, while the second dot is side coupled to the first one through a tunneling junction. Modeling the system using the two impurity Anderson model, we comp... [Phys. Rev. B 81, 115316] Published Fri Mar 12, 2010 Parity and valley degeneracy in multilayer graphene Author(s): Mikito Koshino and Edward McCann We study spatial symmetry in general ABA -stacked multilayer graphene to illustrate how electronic spectra at the two valleys are related in a magnetic field. We show that the lattice of multilayers with an even number of layers as well as that of monolayer graphene satisfy spatial inversion symmetr... [Phys. Rev. B 81, 115315] Published Fri Mar 12, 2010 Effects of strain on the electronic structure of VO_{2} Author(s): Bence Lazarovits, Kyoo Kim, Kristjan Haule, and Gabriel Kotliar We present cluster-dynamic mean field theory (DMFT) (continuous time quantum Monte Carlo method) calculations based on a downfolded tight-binding model in order to study the electronic structure of vanadium dioxide (VO_{2} ) both in the low-temperature (M_{1} ) and high-temperature (rutile) phases. ... [Phys. Rev. B 81, 115117] Published Fri Mar 12, 2010 Direct measurements of spin relaxation times of electrons in tunnel-coupled Ge/Si quantum dot arrays Author(s): A. F. Zinovieva, A. V. Dvurechenskii, N. P. Stepina, A. I. Nikiforov, A. S. Lyubin, and L. V. Kulik Electron paramagnetic resonance and spin-echo methods are used to probe the spin dynamics in Ge/Si heterostructures with quantum dots. A spin coherence time of up to 20 μs is obtained for electrons confined in strain-induced Si potential wells near the apices of Ge quantum dots. The measurements ... [Phys. Rev. B 81, 113303] Published Fri Mar 12, 2010 Many-body GW calculation of the oxygen vacancy in ZnO Author(s): Stephan Lany and Alex Zunger Density-functional theory (DFT) calculations of defect levels in semiconductors based on approximate functionals are subject to considerable uncertainties, in particular due to inaccurate band-gap energies. Testing previous correction methods by many-body GW calculations for the O vacancy in ZnO, we... [Phys. Rev. B 81, 113201] Published Fri Mar 12, 2010 Spectral properties of a resonator driven by a superconducting single-electron transistor Author(s): T. J. Harvey, D. A. Rodrigues, and A. D. Armour We analyze the spectral properties of a resonator coupled to a superconducting single-electron transistor (SSET) close to the Josephson quasiparticle resonance. Focusing on the regime where the resonator is driven into a limit-cycle state by the SSET, we investigate the behavior of the resonator lin... [Phys. Rev. B 81, 104514] Published Fri Mar 12, 2010 Method for reliable realization of a φ Josephson junction Author(s): N. G. Pugach, E. Goldobin, R. Kleiner, and D. Koelle We propose a method to realize a φ Josephson junction by combining alternating 0 and π parts (sub junctions) with an intrinsically nonsinusoidal current-phase relation (CPR). Conditions for the realization of the φ ground state are analyzed. It is shown that taking into account the nonsinusoidal ... [Phys. Rev. B 81, 104513] Published Fri Mar 12, 2010 Orbital character variation of the Fermi surface and doping dependent changes of the dimensionality in BaFe_{2−x} Co_{x} As_{2} from angle-resolved photoemission spectroscopy Author(s): S. Thirupathaiah, S. de Jong, R. Ovsyannikov, H. A. Dürr, A. Varykhalov, R. Follath, Y. Huang, R. Huisman, M. S. Golden, Yu-Zhong Zhang, H. O. Jeschke, R. Valentí, A. Erb, A. Gloskovskii, and J. Fink From a combination of high resolution angle-resolved photoemission spectroscopy and density functional calculations, we derive information on the dimensionality and the orbital character of the electronic states of BaFe_{2−x} Co_{x} As_{2} . Upon increasing Co doping, the electronic states in the ... [Phys. Rev. B 81, 104512] Published Fri Mar 12, 2010 Steady-state counterflow quantum turbulence: Simulation of vortex filaments using the full Biot-Savart law Author(s): Hiroyuki Adachi, Shoji Fujiyama, and Makoto Tsubota We perform a numerical simulation of quantum turbulence produced by thermal counterflow in superfluid ^{4} He by using the vortex filament model with the full Biot-Savart law. The pioneering work of Schwarz has two shortcomings: it neglects the nonlocal terms of the Biot-Savart integral [known as th... [Phys. Rev. B 81, 104511] Published Fri Mar 12, 2010 Magnetism in two-dimensional BN_{1−x} O_{x} and B_{1−x} Si_{x} N : Polarized itinerant and local electrons Author(s): Ru-Fen Liu and Ching Cheng We use density-functional theory based first-principles methods to study the magnetism in a two-dimensional hexagonal BN sheet induced by the different concentrations of oxygen and silicon atoms substituting for nitrogen (O_{N} ) and boron (Si_{B} ) , respectively. We demonstrate the possible format... [Phys. Rev. B 81, 104407] Published Fri Mar 12, 2010 Modified density matrix renormalization group algorithm for the zigzag spin- 1/2 chain with frustrated antiferromagnetic exchange: Comparison with field theory at large J_{2} /J_{1} Author(s): Manoranjan Kumar, Zoltán G. Soos, Diptiman Sen, and S. Ramasesha A modified density matrix renormalization group (DMRG) algorithm is applied to the zigzag spin- 1/2 chain with frustrated antiferromagnetic exchange J_{1} and J_{2} between first and second neighbors. The modified algorithm yields accurate results up to J_{2} /J_{1} ≈4 for the magnetic gap Δ to t... [Phys. Rev. B 81, 104406] Published Fri Mar 12, 2010 Probability distributions of linear statistics in chaotic cavities and associated phase transitions Author(s): Pierpaolo Vivo, Satya N. Majumdar, and Oriol Bohigas We establish large deviation formulas for linear statistics on the N transmission eigenvalues {T_{i} } of a chaotic cavity, in the framework of random matrix theory. Given any linear statistics of interest A=∑_{i=1}^{N} a(T_{i} ) , the probability distribution P_{A} (A,N) of A generically satisfie... [Phys. Rev. B 81, 104202] Published Fri Mar 12, 2010 Dielectric and soft-mode behaviors of AgTaO_{3} Author(s): Hwee Ping Soon, Hiroki Taniguchi, and Mitsuru Itoh The synthesis difficulty on AgTaO_{3} ceramic has been surmounted by the high oxygen-pressure sintering. In this study, the synthesized sample was investigated by both dielectric and micro-Raman measurements in detail. As no dielectric anomaly was observed between 2.2 and 694 K, the previously propo... [Phys. Rev. B 81, 104105] Published Fri Mar 12, 2010 Local structures and concentration dependence of magnetic properties in Cr- and Mn-doped amorphous silicon ferromagnetic thin films Author(s): Y. L. Soo, J. H. Yao, C. S. Wang, S. L. Chang, C. A. Hsieh, J. F. Lee, and T. S. Chin Local environments surrounding magnetic ions in Mn- or Cr-doped and hydrogenated amorphous Si films have been determined using extended x-ray absorption fine structure (EXAFS) method. These films are found to be ferromagnetic with high Curie temperatures above 250 K and therefore are of tremendous i... [Phys. Rev. B 81, 104104] Published Fri Mar 12, 2010 Spin heat accumulation and its relaxation in spin valves Author(s): T. T. Heikkilä, Moosa Hatami, and Gerrit E. W. Bauer We study the concept of spin heat accumulation in excited spin valves, more precisely the effective electron temperature that may become spin dependent, both in linear response and far from equilibrium. A temperature or voltage gradient create nonequilibrium energy distributions of the two spin ense... [Phys. Rev. B 81, 100408] Published Fri Mar 12, 2010 Erratum: Synthesis and properties of superconducting T^{′} -R_{2} CuO_{4} (R=Pr,Nd,Sm,Eu,Gd) [Phys. Rev. B 79, 100508 (2009)] Author(s): Osamu Matsumoto, Aya Utsuki, Akio Tsukada, Hideki Yamamoto, Takaaki Manabe, and Michio Naito [Phys. Rev. B 81, 099904] Published Fri Mar 12, 2010 Charge transport and magnetization profile at the interface between the correlated metal CaRuO_{3} and the antiferromagnetic insulator CaMnO_{3} Author(s): J. W. Freeland, J. Chakhalian, A. V. Boris, J.-M. Tonnerre, J. J. Kavich, P. Yordanov, S. Grenier, P. Zschack, E. Karapetrova, P. Popovich, H. N. Lee, and B. Keimer A combination of spectroscopic probes was used to develop a detailed experimental description of the transport and magnetic properties of superlattices composed of the paramagnetic metal CaRuO_{3} and the antiferromagnetic insulator CaMnO_{3} . The charge-carrier density and Ru valence state in the ... [Phys. Rev. B 81, 094414] Published Fri Mar 12, 2010 Phase coexistence and magnetocaloric effect in La_{5/8−y} Pr_{y} Ca_{3/8} MnO_{3} (y=0.275) Author(s): M. H. Phan, M. B. Morales, N. S. Bingham, H. Srikanth, C. L. Zhang, and S. W. Cheong The magnetocaloric effect (MCE) was measured to probe the nature of phase coexistence of structurally different ferromagnetic metallic (FMM) and charge-ordered insulating phases in La_{5/8−y} Pr_{y} Ca_{3/8} MnO_{3} (y=0.275) single crystals. The MCE peaks with both positive and negative values ar... [Phys. Rev. B 81, 094413] Published Fri Mar 12, 2010 Density variations in liquid tellurium: Roles of rings, chains, and cavities Author(s): J. Akola, R. O. Jones, S. Kohara, T. Usuki, and E. Bychkov Liquid tellurium has been studied by density-functional/molecular-dynamics simulations at 560, 625, 722, and 970 K and by high-energy x-ray diffraction (HEXRD) at 763 K and 973 K. The HEXRD measurements agree very well with earlier neutron-scattering data of Menelle The density maximum near the melt... [Phys. Rev. B 81, 094202] Published Fri Mar 12, 2010 Density functional theory study of the relative stability of the iron disulfide polymorphs pyrite and marcasite Author(s): D. Spagnoli, K. Refson, K. Wright, and J. D. Gale The performance of density functional theory has been widely examined with regard to its ability to predict the properties of minerals, though less attention has been given to the correct determination of the relative stability of structurally similar polymorphs. Here a detailed examination is perfo... [Phys. Rev. B 81, 094106] Published Fri Mar 12, 2010

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