Physical Review B

Physical Review B

Recent articles in Physical Review B
Effective time-reversal symmetry breaking in the spin relaxation in a graphene quantum dot Author(s): P. R. Struck and Guido Burkard We study the relaxation of a single electron spin in a circular gate-tunable quantum dot in gapped graphene. Direct coupling of the electron spin to out-of-plane phonons via the intrinsic spin-orbit coupling leads to a relaxation time T_{1} which is independent of the B field at low fields. We also ... [Phys. Rev. B 82, 125401] Published Wed Sep 01, 2010 Impact of disorder on the ν=2 quantum Hall plateau in graphene Author(s): Jean-Marie Poumirol, Walter Escoffier, Amit Kumar, Bertrand Raquet, and Michel Goiran We investigate the quantum Hall regime in a graphene flake with different levels of disorder. Under high magnetic field, an unexpected decrease in the Hall resistance occurs when only the zeroth-energy Landau level is populated. The presence of disorder rules out the expected appearance of the ν=0 ... [Phys. Rev. B 82, 121401] Published Wed Sep 01, 2010 Oscillatory angular dependence of the magnetoresistance in a topological insulator Bi_{1−x} Sb_{x} Author(s): A. A. Taskin, Kouji Segawa, and Yoichi Ando The angular-dependent magnetoresistance and the Shubnikov-de Haas oscillations are studied in a topological insulator Bi_{0.91} Sb_{0.09} , where the two-dimensional (2D) surface states coexist with a three-dimensional (3D) bulk Fermi surface (FS). Two distinct types of oscillatory phenomena are dis... [Phys. Rev. B 82, 121302] Published Wed Sep 01, 2010 Experimental test for geminate recombination applied to organic solar cells Author(s): R. A. Street, Sarah Cowan, and A. J. Heeger We show that a clear experimental test can distinguish between geminate and nongeminate recombination in low mobility semiconductors. For the particular case of the organic solar cell, the relative contribution of geminate recombination can be determined by measuring transient photoconductivity vers... [Phys. Rev. B 82, 121301] Published Wed Sep 01, 2010 Effect of noble-metal contacts on doping and band gap of graphene Author(s): A. Varykhalov, M. R. Scholz, Timur K. Kim, and O. Rader Density-functional theory of graphene predicts that noble-metal contacts will provide doping but leave the Dirac crossing point intact. We use high-resolution angle-resolved photoemission and noble-metal intercalation to show that, instead, substantial band gaps open in proportion to the doping effe... [Phys. Rev. B 82, 121101] Published Wed Sep 01, 2010 Erratum: Dynamical mean-field theory of correlated hopping: A rigorous local approach [Phys. Rev. B 67, 075101 (2003)] Author(s): Andrij M. Shvaika [Phys. Rev. B 82, 119901] Published Wed Sep 01, 2010 Atomistic study of xenon crystal growth via low-temperature atom beam deposition Author(s): Nicola Totò, Christian Schön, and M. Jansen We studied theoretically the deposition of Xe atoms on a sapphire substrate and the subsequent growth of ordered Xe phases via the low-temperature atom beam deposition method. This chemical synthesis method [D. Fischer and M. Jansen, J. Am. Chem. Soc. 41, 1755 (2002)] is particularly suitable for sy... [Phys. Rev. B 82, 115401] Published Wed Sep 01, 2010 Quasiparticle self-consistent GW theory of III-V nitride semiconductors: Bands, gap bowing, and effective masses Author(s): A. Svane, N. E. Christensen, I. Gorczyca, M. van Schilfgaarde, A. N. Chantis, and T. Kotani The electronic band structures of InN, GaN, and a hypothetical ordered InGaN_{2} compound, all in the wurtzite crystal structure, are calculated using the quasiparticle self-consistent GW approximation. This approach leads to band gaps which are significantly improved compared to gaps calculated on ... [Phys. Rev. B 82, 115102] Published Wed Sep 01, 2010 Numerical study of photoinduced dynamics in a double-exchange model Author(s): Y. Kanamori, H. Matsueda, and S. Ishihara Photoinduced spin and charge dynamics in double-exchange model are numerically studied. The Lanczos method and the density-matrix renormalization-group method are applied to one-dimensional finite-size clusters. By photon irradiation in a charge-ordered (CO) insulator associated with antiferromagnet... [Phys. Rev. B 82, 115101] Published Wed Sep 01, 2010 Structure of GaAs(1 [over ¯] 1 [over ¯] 1 [over ¯] ) under Ga-rich conditions: A sqrt[19] × sqrt[19] reconstruction model Author(s): Hiroaki Koga A GaAs(1 [over ¯] 1 [over ¯] 1 [over ¯] ) sqrt[19] × sqrt[19] reconstruction model that is almost consistent with the electron-counting (EC) rule was developed. This model differs from earlier hexagonal-ring models by three As atoms surrounding the ring and an As atom filling its center. First-p... [Phys. Rev. B 82, 113301] Published Wed Sep 01, 2010 Spin current in topologically trivial and nontrivial noncentrosymmetric superconductors Author(s): Chi-Ken Lu and Sungkit Yip We study theoretically the surface of time-reversal-symmetric, noncentrosymmetric superconductor with mixed singlet and triplet order parameters. A pair of counterpropagating subgap quasiparticle surface bound states with opposite spin projections are obtained in the nontrivial Z_{2} case where the ... [Phys. Rev. B 82, 104501] Published Wed Sep 01, 2010 La substitution effect and hyperfine-enhanced ^{141} Pr nuclear spin dynamics in PrPb_{3} : ^{139} La NMR study in Pr_{0.97} La_{0.03} Pb_{3} Author(s): Y. Tokunaga, H. Sakai, H. Chudo, S. Kambe, H. Yasuoka, H. S. Suzuki, R. E. Walstedt, Y. Homma, D. Aoki, and Y. Shiokawa ^{139} La NMR studies have been performed on PrPb_{3} substituted with 3% La. The temperature dependence of the local magnetic susceptibility around La ions has been extracted from the ^{139} La Knight shift. These data show that the nonmagnetic Γ_{3} crystalline-electric-field (CEF) ground state (... [Phys. Rev. B 82, 104401] Published Wed Sep 01, 2010 Effect of doping and oxygen vacancies on the octahedral tilt transitions in the BaCeO_{3} perovskite Author(s): F. Cordero, F. Trequattrini, F. Deganello, V. La Parola, E. Roncari, and A. Sanson We present a systematic study of the effect of Y doping and hydration level on the structural transformations of BaCeO_{3} based on anelastic spectroscopy experiments. The temperature of the intermediate transformation between rhombohedral and orthorhombic Imma phases rises with increasing the molar... [Phys. Rev. B 82, 104102] Published Wed Sep 01, 2010 Strain and correlation of self-organized Ge_{1−x} Mn_{x} nanocolumns embedded in Ge (001) Author(s): S. Tardif, V. Favre-Nicolin, F. Lançon, E. Arras, M. Jamet, A. Barski, C. Porret, P. Bayle-Guillemaud, P. Pochet, T. Devillers, and M. Rovezzi We report on the structural properties of Ge_{1−x} Mn_{x} layers grown by molecular-beam epitaxy. In these layers, nanocolumns with a high Mn content are embedded in an almost-pure Ge matrix. We have used grazing-incidence x-ray scattering, atomic force and transmission electron microscopy to stud... [Phys. Rev. B 82, 104101] Published Wed Sep 01, 2010 Superlattice correlations in Tb_{2} Ti_{2} O_{7} under the application of [110] magnetic field Author(s): J. P. C. Ruff, B. D. Gaulin, K. C. Rule, and J. S. Gardner We report an analysis of neutron diffraction from single crystals of the spin-liquid pyrochlore Tb_{2} Ti_{2} O_{7} under the application of magnetic fields along the crystallographic [110] direction. Such a perturbation has been shown to destroy the spin-liquid ground state and induce long-range or... [Phys. Rev. B 82, 100401] Published Wed Sep 01, 2010 Erratum: Spin-wave interaction in two-dimensional ferromagnets with dipolar forces [Phys. Rev. B 77, 144433 (2008)] Author(s): A. V. Syromyatnikov [Phys. Rev. B 82, 099901] Published Wed Sep 01, 2010 Symmetry analysis of magneto-optical effects: The case of x-ray diffraction and x-ray absorption at the transition metal L_{2,3} edge Author(s): M. W. Haverkort, N. Hollmann, I. P. Krug, and A. Tanaka A general symmetry analysis of the optical conductivity or scattering tensor is presented and used to rewrite the conductivity tensor as a sum of linear independent spectra multiplied by simple functions depending on the local magnetization direction. This allows one to describe the full, magnetizat... [Phys. Rev. B 82, 094403] Published Wed Sep 01, 2010 Interparticle interaction and crossover in critical lines on field-temperature plane in Pr_{0.5} Sr_{0.5} MnO_{3} nanoparticles Author(s): A. K. Pramanik and A. Banerjee The magnetic properties and the effects of interparticle interaction on them have been studied in nanoparticles of half-doped Pr_{0.5} Sr_{0.5} MnO_{3} . Three samples consisting of nanoparticles of different average particle sizes are synthesized to render the variation in interparticle interaction... [Phys. Rev. B 82, 094402] Published Wed Sep 01, 2010 Spin correlations in the geometrically frustrated RBaCo_{4} O_{7} antiferromagnets: Mean-field approach and Monte Carlo simulations Author(s): D. D. Khalyavin, P. Manuel, J. F. Mitchell, and L. C. Chapon Spin correlations in the geometrically frustrated RBaCo_{4} O_{7} compounds, usually described as an alternating stacking of Kagome and triangular layers on a hexagonal lattice, have been studied by mean-field approach and by Monte Carlo simulations. The behavior of the system was modeled with an is... [Phys. Rev. B 82, 094401] Published Wed Sep 01, 2010 Light and stable triplet bipolarons on square and triangular lattices Author(s): J. P. Hague and P. E. Kornilovitch We compute the properties of singlet and triplet bipolarons on two-dimensional lattices using the continuous-time quantum Monte Carlo algorithm. Properties of the bipolaron including the total energy, inverse mass, bipolaron radius, and number of phonons associated with the bipolaron demonstrate the... [Phys. Rev. B 82, 094301] Published Wed Sep 01, 2010 Structural transitions and relaxation processes during the epitaxial growth of ultrathin CaF_{2} films on Si(111) Author(s): Carsten Deiter, Markus Bierkandt, Andreas Klust, Christian Kumpf, Yixi Su, Oliver Bunk, Robert Feidenhans’l, and Joachim Wollschläger The structure and morphology of ultrathin lattice matched CaF_{2} films of very few monolayers thickness, which were deposited on Si(111) substrates by molecular-beam epitaxy, have been studied in situ by synchrotron based grazing incidence x-ray diffraction. Even for the thinnest investigated film ... [Phys. Rev. B 82, 085449] Published Tue Aug 31, 2010 Dynamical control of Mn spin-system cooling by photogenerated carriers in a (Zn,Mn)Se/BeTe heterostructure Author(s): J. Debus, A. A. Maksimov, D. Dunker, D. R. Yakovlev, I. I. Tartakovskii, A. Waag, and M. Bayer The magnetization dynamics of the Mn spin system in an undoped (Zn,Mn)Se/BeTe type-II quantum well was studied by a time-resolved pump-probe photoluminescence technique. The Mn spin temperature was evaluated from the giant Zeeman shift of the exciton line in an external magnetic field of 3 T. The re... [Phys. Rev. B 82, 085448] Published Tue Aug 31, 2010 Role of molecular electronic structure in inelastic electron tunneling spectroscopy: O_{2} on Ag(110) Author(s): Serge Monturet, Maite Alducin, and Nicolás Lorente Density-functional theory (DFT) simulations corrected by the intramolecular Coulomb repulsion U are performed to evaluate the vibrational inelastic electron tunneling spectroscopy (IETS) of O_{2} on Ag(110). In contrast to DFT calculations that predict a spinless adsorbed molecule, the inclusion of ... [Phys. Rev. B 82, 085447] Published Tue Aug 31, 2010 Exchange cotunneling through quantum dots with spin-orbit coupling Author(s): J. Paaske, A. Andersen, and K. Flensberg We investigate the effects of spin-orbit interaction (SOI) on the exchange cotunneling through a spinful Coulomb blockaded quantum dot. In the case of zero magnetic field, Kondo effect is shown to take place via a Kramers doublet and the SOI will merely affect the Kondo temperature. In contrast, we ... [Phys. Rev. B 82, 081309] Published Tue Aug 31, 2010 Characterizing the wetting of metallic thin films with angle-resolved photoelectron spectroscopy Author(s): Dah-An Luh, Kuan-Chun Liu, Cheng-Maw Cheng, and Ku-Ding Tsuei The wetting of thin Ag films on Cu(111) is characterized in detail with angle-resolved photoelectron spectroscopy. After constructing disordered Ag films on Cu(111), we monitored the evolution of their layer-resolved Shockley states during wetting. Our results provide the first observation of a tran... [Phys. Rev. B 82, 075434] Published Tue Aug 31, 2010 Maximum relative excitation of a specific vibrational mode via optimum laser-pulse duration Author(s): Xiang Zhou, Zhibin Lin, Chenwei Jiang, Meng Gao, and Roland E. Allen For molecules and materials responding to femtosecond-scale optical laser pulses, we predict maximum relative excitation of a Raman-active vibrational mode with period T when the pulse has a full-width-at-half-maximum duration τ≈0.42T . This result follows from a general analytical model, and is ... [Phys. Rev. B 82, 075433] Published Tue Aug 31, 2010 Multiferroic BiFeO_{3} -BiMnO_{3} nanoscale checkerboard from first principles Author(s): L. Pálová, P. Chandra, and K. M. Rabe We present a first principles study of an unusual heterostructure, an atomic-scale checkerboard of BiFeO_{3} -BiMnO_{3} , and compare its properties to the two bulk constituent materials, BiFeO_{3} and BiMnO_{3} . The “nanocheckerboard” is found to have a multiferroic ground state with the desir... [Phys. Rev. B 82, 075432] Published Tue Aug 31, 2010 Structural components of the Pt/Si(111)-( sqrt[3] × sqrt[3] ) surface from scanning tunneling microscopy Author(s): P. Höpfner, M. Wisniewski, F. Sandrock, J. Schäfer, and R. Claessen From topographic inspection of the ( sqrt[3] × sqrt[3] )-Pt/Si(111) surface by scanning tunneling microscopy, key structural elements are identified. A characteristic triangular building block in each ( sqrt[3] × sqrt[3] ) unit cell, composed of charge maxima at approximately the bulk Pt-Pt distan... [Phys. Rev. B 82, 075431] Published Tue Aug 31, 2010 Structure and electronic properties of step edges in the aluminum oxide film on NiAl(110) Author(s): L. Heinke, L. Lichtenstein, G. H. Simon, T. König, M. Heyde, and H.-J. Freund Thin film aluminum oxide has been investigated at step edges of the NiAl(110) substrate by means of low temperature scanning tunneling microscopy and atomic force microscopy. A preference of the step edges for certain orientations and a restructuring of the substrate step edges during the oxidation ... [Phys. Rev. B 82, 075430] Published Tue Aug 31, 2010 Raman scattering studies of heavily doped microcrystalline porous silicon and porous silicon free-standing membranes Author(s): Dorra Abidi, Bernard Jusserand, and Jean-Louis Fave The phonon confinement model is often used to analyze Raman scattering band shapes of porous silicon and hence to determine the size of crystallites embedded in the porous layer. We show in this paper, from backscattering Raman spectra, the importance to avoid using resonant excitation which would s... [Phys. Rev. B 82, 075210] Published Tue Aug 31, 2010

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