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Systematic calculation of threshold displacement energies: Case study in rutile (2012)

M. Robinson, N. A. Marks, K. R. Whittle, and G. R. Lumpkin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): M. Robinson, N. A. Marks, K. R. Whittle, and G. R. Lumpkin A generalized and systematic method of calculating threshold displacement energies ( E d ) using molecular dynamics simulations has been developed and applied to rutile TiO 2 . Statistically representative results have been achieved through fine sampling of impact energy and trajectory for each atomic sp... [Phys. Rev. B 85, 104105] Published Thu Mar 08, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Theoretical model obtained in momentum space for charge transport in a system consisting of noninteracting polarons (2012)

F. Marsusi and J. Sabbaghzadeh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): F. Marsusi and J. Sabbaghzadeh We have developed a theory of charge transport in a system of noninteracting polarons. The theory is conducted to a compact relation through a nonperturbative method based on electron-phonon Hamiltonian. The derived final result represents two different limits of band and phonon-assisted transport, ... [Phys. Rev. B 85, 115302] Published Thu Mar 08, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Configuration and binding energy of multiple hydrogen atoms trapped in monovacancy in bcc transition metals (2012)

Kazuhito Ohsawa, Keisuke Eguchi, Hideo Watanabe, Masatake Yamaguchi, and Masatoshi Yagi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Kazuhito Ohsawa, Keisuke Eguchi, Hideo Watanabe, Masatake Yamaguchi, and Masatoshi Yagi We present a first-principles study of stable configurations of single and multiple H atoms in a monovacancy in bcc transition metals and binding energies of the H atoms to the monovacancy. Typical bcc transition metals are group-V elements (V, Nb, and Ta), group-VI elements (Cr, Mo, and W), and Fe.... [Phys. Rev. B 85, 094102] Published Thu Mar 08, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Electronic and structural characterization of divacancies in irradiated graphene (2012)

Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Miguel M. Ugeda, Iván Brihuega, Fanny Hiebel, Pierre Mallet, Jean-Yves Veuillen, José M. Gómez-Rodríguez, and Félix Ynduráin We provide a thorough study of a carbon divacancy, a point defect expected to have a large impact on the properties of graphene. Low-temperature scanning tunneling microscopy imaging of irradiated graphene on different substrates enabled us to identify a common twofold symmetry point defect. Our fir... [Phys. Rev. B 85, 121402] Published Thu Mar 08, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Modal analysis method to describe weak nonlinear effects in metamaterials (2012)

Y. Zeng, D. A. R. Dalvit, J. O'Hara, and S. A. Trugman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Y. Zeng, D. A. R. Dalvit, J. O'Hara, and S. A. Trugman We apply a rigorous eigenmode analysis to study the electromagnetic properties of linear and weakly nonlinear metamaterials. The nonlinear response can be totally described by the linear eigenmodes when weak nonlinearities are attributed to metamaterials. We use this theory to interpret intrinsic se... [Phys. Rev. B 85, 125107] Published Thu Mar 08, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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MgFeGe as an isoelectronic and isostructural analog of the superconductor LiFeAs (2012)

Xiaofeng Liu, Satoru Matsuishi, Satoru Fujitsu, and Hideo Hosono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Xiaofeng Liu, Satoru Matsuishi, Satoru Fujitsu, and Hideo Hosono MgFeGe with a CeFeSi-type structure was synthesized by high-pressure method, and its electrical transport, magnetic properties, and electronic structure were investigated. It is found that MgFeGe has the smallest c / a (1.65) ratio and the shortest in-plane Fe-Fe distance (2.75 Å) among CeFeSi-type an... [Phys. Rev. B 85, 104403] Published Thu Mar 08, 2012

Schlagwort(e): Magnetism

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First-principles study of the SiN_{x}/TiN(001) interface (2012)

Tobias Marten, Björn Alling, Eyvaz I. Isaev, Hans Lind, Ferenc Tasnádi, Lars Hultman, and Igor A. Abrikosov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Tobias Marten, Björn Alling, Eyvaz I. Isaev, Hans Lind, Ferenc Tasnádi, Lars Hultman, and Igor A. Abrikosov The structure of the SiN x tissue phase in superhard TiN/SiN x nanocomposites has been debated in the literature. We present a theoretical investigation of the possibility of crystalline and coherent (001) interfaces that satisfies the two necessary criteria, stability with respect to lattice vibratio... [Phys. Rev. B 85, 104106] Published Thu Mar 08, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Radiative coupling and weak lasing of exciton-polariton condensates (2012)

I. L. Aleiner, B. L. Altshuler, and Y. G. Rubo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): I. L. Aleiner, B. L. Altshuler, and Y. G. Rubo In spite of having finite lifetimes exciton-polaritons in microcavities are known to condense at strong enough pumping of the reservoir. We present an analytical theory of such Bose condensates on a set of localized one-particle states: condensation centers. To understand the physics of these arrays... [Phys. Rev. B 85, 121301] Published Thu Mar 08, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Graphing and grafting graphene: Classifying finite topological defects (2012)

Eric Cockayne

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Eric Cockayne The structure of finite-area topological defects in graphene is described in terms of both the direct honeycomb lattice and its dual triangular lattice. Such defects are equivalent to cutting out a patch of graphene and replacing it with a different patch with the same number of dangling bonds. An i... [Phys. Rev. B 85, 125409] Published Thu Mar 08, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Decoherence and dynamical decoupling control of nitrogen vacancy center electron spins in nuclear spin baths (2012)

Nan Zhao, Sai-Wah Ho, and Ren-Bao Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Nan Zhao, Sai-Wah Ho, and Ren-Bao Liu We theoretically study the decoherence and the dynamical decoupling control of nitrogen vacancy center electron spins in high-purity diamond, where the hyperfine interaction with 13 C nuclear spins is the dominating decoherence mechanism. The decoherence is formulated as the entanglement between the ... [Phys. Rev. B 85, 115303] Published Thu Mar 08, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Electron spin resonance observation of dehydration-induced spin excitations in quasi-one-dimensional iodo-bridged diplatinum complexes (2012)

Hisaaki Tanaka, Shin-ichi Kuroda, Hiroaki Iguchi, Shinya Takaishi, and Masahiro Yamashita

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Hisaaki Tanaka, Shin-ichi Kuroda, Hiroaki Iguchi, Shinya Takaishi, and Masahiro Yamashita Electron spin resonance (ESR) measurements have been performed on a series of quasi-one-dimensional iodo-bridged diplatinum complexes K 2 [C 3 H 5 R (NH 3 ) 2 ][Pt 2 (pop) 4 I] · 4H 2 O (pop = P 2 H 2 O 5 2− ; R = H, CH 3 , or Cl), where dehydration/rehydration of the crystalline water switches the electronic state reversibly ... [Phys. Rev. B 85, 073104] Published Tue Feb 21, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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12

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Adaptive-boost molecular dynamics simulation of carbon diffusion in iron (2012)

Akio Ishii, Shigenobu Ogata, Hajime Kimizuka, and Ju Li

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Akio Ishii, Shigenobu Ogata, Hajime Kimizuka, and Ju Li We have developed an accelerated molecular dynamics (MD) method to model atomic-scale rare events. In this method, a smooth histogram of collective variables is first estimated by canonical ensemble molecular dynamics calculations, and then a temperature-dependent boost potential is iteratively cons... [Phys. Rev. B 85, 064303] Published Tue Feb 21, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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Controlling the frequency-temperature sensitivity of a cryogenic sapphire maser frequency standard by manipulating Fe^{3+} spins in the sapphire lattice (2012)

K. Benmessai, D. L. Creedon, J.-M. Le Floch, M. E. Tobar, M. Mrad, P.-Y. Bourgeois, Y. Kersalé, and V. Giordano

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): K. Benmessai, D. L. Creedon, J.-M. Le Floch, M. E. Tobar, M. Mrad, P.-Y. Bourgeois, Y. Kersalé, and V. Giordano To create a stable signal from a cryogenic sapphire maser frequency standard, the frequency-temperature dependence of the supporting whispering gallery mode must be annulled. We report the ability to control this dependence by manipulating the paramagnetic susceptibility of Fe 3+ ions in the sapphire... [Phys. Rev. B 85, 075122] Published Tue Feb 21, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Optimized confinement of fermions in two dimensions (2012)

J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): J. D. Cone, S. Chiesa, V. R. Rousseau, G. G. Batrouni, and R. T. Scalettar One of the challenging features of studying model Hamiltonians with cold atoms in optical lattices is the presence of spatial inhomogeneities induced by the confining potential, which results in the coexistence of different phases.This paper presents quantum Monte Carlo results comparing methods for... [Phys. Rev. B 85, 075418] Published Tue Feb 21, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Near-field spectroscopy of silicon dioxide thin films (2012)

L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): L. M. Zhang, G. O. Andreev, Z. Fei, A. S. McLeod, G. Dominguez, M. Thiemens, A. H. Castro-Neto, D. N. Basov, and M. M. Fogler We analyze the results of scanning near-field infrared spectroscopy performed on thin films of a-SiO 2 on Si substrate. The measured near-field signal exhibits surface-phonon resonances whose strength has a prominent thickness dependence in the range from 2 to 300 nm . These observations are compared ... [Phys. Rev. B 85, 075419] Published Tue Feb 21, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Current-conserving Aharonov-Bohm interferometry with arbitrary spin interactions (2012)

Minchul Lee and Dimitrije Stepanenko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Minchul Lee and Dimitrije Stepanenko We propose a general scattering-matrix formalism that guarantees the charge conservation at junctions between conducting arms with arbitrary spin interactions. By using our formalism, we find that the spin-flip scattering can happen even at nonmagnetic junctions if the spin eigenstates in arms are n... [Phys. Rev. B 85, 075316] Published Tue Feb 21, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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17

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Surface plasmon enhanced absorption and suppressed transmission in periodic arrays of graphene ribbons (2012)

A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): A. Yu. Nikitin, F. Guinea, F. J. Garcia-Vidal, and L. Martin-Moreno Resonance diffraction in the periodic array of graphene microribbons is theoretically studied following a recent experiment [ L. Ju et al. Nature Nanotech. 6 630 (2011) ]. Systematic studies over a wide range of parameters are presented. It is shown that a much richer resonant picture would be obser... [Phys. Rev. B 85, 081405] Published Tue Feb 21, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Erratum: Frequency domain winding number and interaction effect on topological insulators [Phys. Rev. B 84, 205116 (2011)] (2012)

Lei Wang, Xi Dai, and X. C. Xie

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Lei Wang, Xi Dai, and X. C. Xie [Phys. Rev. B 85, 079902] Published Tue Feb 21, 2012

Schlagwort(e): Errata

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Coherent transport in multibranch quantum circuits (2012)

A. Ziletti, F. Borgonovi, G. L. Celardo, F. M. Izrailev, L. Kaplan, and V. G. Zelevinsky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): A. Ziletti, F. Borgonovi, G. L. Celardo, F. M. Izrailev, L. Kaplan, and V. G. Zelevinsky An open multibranch quantum circuit is considered from the viewpoint of coherent electron or wave transport, both with and without intrinsic disorder. Starting with the closed system, we give analytical conditions for the appearance of two isolated localized states out of the energy band. In the ope... [Phys. Rev. B 85, 052201] Published Fri Feb 24, 2012

Schlagwort(e): Inhomogeneous, disordered, and partially ordered systems

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Domain annihilation due to temperature and thickness gradients in single-crystal BaTiO_{3} (2012)

L. J. McGilly, T. L. Burnett, A. Schilling, M. G. Cain, and J. M. Gregg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): L. J. McGilly, T. L. Burnett, A. Schilling, M. G. Cain, and J. M. Gregg The manner in which 90° ferroelectric-ferroelastic domains respond to changes in temperature has been mapped in BaTiO 3 single crystals using atomic force microscopy. Domain periodicity remains unaltered until approximately 2 °C below the Curie temperature ( T C ), whereupon domains coarsened dramatical... [Phys. Rev. B 85, 054113] Published Fri Feb 24, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Effect of impurities on the superheating field of type-II superconductors (2012)

F. Pei-Jen Lin and A. Gurevich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): F. Pei-Jen Lin and A. Gurevich We consider the effect of nonmagnetic and magnetic impurities on the superheating field H s in a type-II superconductor. We solved the Eilenberger equations, which take into account the nonlinear pairbreaking of Meissner screening currents, and calculated H s ( T ) for arbitrary temperatures and impurity... [Phys. Rev. B 85, 054513] Published Fri Feb 24, 2012

Schlagwort(e): Superfluidity and superconductivity

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Multiparticle pseudopotentials for multicomponent quantum Hall systems (2012)

Simon C. Davenport and Steven H. Simon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Simon C. Davenport and Steven H. Simon The Haldane pseudopotential construction has been an extremely powerful concept in quantum Hall physics—it not only gives a minimal description of the space of Hamiltonians but also suggests special model Hamiltonians (those where certain pseudopotential are set to zero) that may have exactly solvab... [Phys. Rev. B 85, 075430] Published Fri Feb 24, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Editorial: Stepping Away (2012)

Peter D. Adams

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Peter D. Adams [Phys. Rev. B 85, 050001] Published Fri Feb 24, 2012

Schlagwort(e): EDITORIALS AND ANNOUNCEMENTS

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Optimization of magnetic flux density in electrical steels: Slater-Pauling pattern repetition in multicomponent alloys (2012)

Seung Su Baik, S. K. Kwon, and B. I. Min

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Seung Su Baik, S. K. Kwon, and B. I. Min By investigating the magnetization variation of Fe-rich multicomponent alloys with solute concentration, the magnetic flux density of Si electrical steel is optimized with average valency. For binary alloys of Fe - X [ X = d – 5 d transition-metal (TM) and 3 s p – 6 s p elements], the usual mountain-shape behavio... [Phys. Rev. B 85, 052402] Published Fri Feb 24, 2012

Schlagwort(e): Magnetism

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Tailoring of magnetism in Pt/Co/Pt ultrathin films by ion irradiation (2012)

A. Maziewski, P. Mazalski, Z. Kurant, M. O. Liedke, J. McCord, J. Fassbender, J. Ferré, A. Mougin, A. Wawro, L. T. Baczewski, A. Rogalev, F. Wilhelm, and T. Gemming

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): A. Maziewski, P. Mazalski, Z. Kurant, M. O. Liedke, J. McCord, J. Fassbender, J. Ferré, A. Mougin, A. Wawro, L. T. Baczewski, A. Rogalev, F. Wilhelm, and T. Gemming Magnetization orientation in Ga + -irradiated Pt/Co( d Co )/Pt ultrathin films can be changed in a controlled way by adjusting the ion fluence, F . Two-dimensional ( d Co , F ) diagrams of magnetic and magneto-optical properties have been derived. Distinct out-of-plane magnetic anisotropy states with enhanced... [Phys. Rev. B 85, 054427] Published Fri Feb 24, 2012

Schlagwort(e): Magnetism

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Publisher’s Note: Density of states spectra in ferromagnet/superconductor/ferromagnet heterostructures [Phys. Rev. B 83, 214506 (2011)] (2012)

Hao Meng, Lin Wen, Guo-Qiao Zha, and Shi-Ping Zhou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Hao Meng, Lin Wen, Guo-Qiao Zha, and Shi-Ping Zhou [Phys. Rev. B 85, 059904] Published Fri Feb 24, 2012

Schlagwort(e): Errata

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Editorial: Stepping Away (2012)

Peter D. Adams

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Peter D. Adams [Phys. Rev. B 85, 070001] Published Fri Feb 24, 2012

Schlagwort(e): EDITORIALS AND ANNOUNCEMENTS

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Multiphonon relaxation of moderately excited carriers in Si/SiO_{2} nanocrystals (2012)

A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): A. S. Moskalenko, J. Berakdar, A. N. Poddubny, A. A. Prokofiev, I. N. Yassievich, and S. V. Goupalov We study the phonon-assisted intraband relaxation of electrons and holes confined in Si nanocrystals. The rates of relaxation processes are calculated as functions of the nanocrystal size and of the temperature. It occurs that the main contribution to the relaxation is provided by the mechanism wher... [Phys. Rev. B 85, 085432] Published Fri Feb 24, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Formation and coarsening of the concertina magnetization pattern in elongated thin-film elements (2012)

Jutta Steiner, Rudolf Schäfer, Holm Wieczoreck, Jeffrey McCord, and Felix Otto

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Jutta Steiner, Rudolf Schäfer, Holm Wieczoreck, Jeffrey McCord, and Felix Otto The concertina is a magnetization pattern in elongated thin-film elements of a soft ferromagnetic material. It is a ubiquitous domain pattern that occurs in the process of magnetization reversal in the direction of the long axis of the small element. Van den Berg and Vatvani [ IEEE Trans. Magn. 18 ... [Phys. Rev. B 85, 104407] Published Mon Mar 12, 2012

Schlagwort(e): Magnetism

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Role of anisotropy in the Förster energy transfer from a semiconductor quantum well to an organic crystalline overlayer (2012)

S. Kawka and G. C. La Rocca

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S. Kawka and G. C. La Rocca We consider the nonradiative resonant energy transfer from a two-dimensional Wannier exciton (donor) to a Frenkel exciton of a molecular crystal overlayer (acceptor). We characterize the effect of the optical anisotropy of the organic subsystem on this process. Using realistic values of material par... [Phys. Rev. B 85, 115305] Published Mon Mar 12, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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High-temperature series expansion study of the Heisenberg antiferromagnet on the hyperkagome lattice: Comparison with Na_{4}Ir_{3}O_{8} (2012)

R. R. P. Singh and J. Oitmaa

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): R. R. P. Singh and J. Oitmaa We develop high-temperature series expansions for ln Z and the uniform structure factor of the spin-half Heisenberg model on the hyperkagome lattice to the order of β 16 . These expansions are used to calculate the uniform susceptibility ( χ ), the entropy ( S ), and the heat capacity ( C ) of the model as ... [Phys. Rev. B 85, 104406] Published Mon Mar 12, 2012

Schlagwort(e): Magnetism

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First-principles theoretical investigation of monoatomic and dimer Mn adsorption on noble metal (111) surfaces (2012)

Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Francisco Muñoz, Aldo H. Romero, Jose Mejía-López, and J. L. Morán-López A theoretical investigation of the adsorption of Mn single atoms and dimers on the (111) surface of Cu, Ag, and Au, within the framework of the density functional theory, is presented. First, the bulk and the clean (111) surface electronic structures are calculated, with results that agree well with... [Phys. Rev. B 85, 115417] Published Mon Mar 12, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Optical phonon modes in ordered core-shell CdSe/CdS nanorod arrays (2012)

Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Andrea Giugni, Gobind Das, Alessandro Alabastri, Remo Proietti Zaccaria, Marco Zanella, Isabella Franchini, Enzo Di Fabrizio, and Roman Krahne We investigate the optical phonons in “dot-in-a-rod” core–shell CdSe/CdS nanorods at wavelengths resonant with the optical transitions either in the core or in the shell. At a wavelength above the CdS band gap, only CdS phonon modes were detected. In contrast, at excitation in resonance with the cor... [Phys. Rev. B 85, 115413] Published Mon Mar 12, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Magnetophonon resonance in graphite: High-field Raman measurements and electron-phonon coupling contributions (2012)

Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Y. Kim, Y. Ma, A. Imambekov, N. G. Kalugin, A. Lombardo, A. C. Ferrari, J. Kono, and D. Smirnov We perform Raman scattering experiments on natural graphite in magnetic fields up to 45 T, observing a series of peaks due to interband electronic excitations over a much broader magnetic field range than previously reported. We also explore electron-phonon coupling in graphite via magnetophonon res... [Phys. Rev. B 85, 121403] Published Mon Mar 12, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Charge fluctuations in single-electron tunneling oscillations (2012)

C. Negri and F. Pistolesi

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): C. Negri and F. Pistolesi It has been predicted that in the presence of a sufficiently high dissipative environment transport in a small tunnel junction can become extremely regular, giving rise to the phenomenon of single-electron tunneling oscillations. Recent progress in detection of high-frequency current fluctuations an... [Phys. Rev. B 85, 115416] Published Mon Mar 12, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Smooth gauge for topological insulators (2012)

Alexey A. Soluyanov and David Vanderbilt

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Alexey A. Soluyanov and David Vanderbilt We develop a technique for constructing Bloch-like functions for 2D Z 2 insulators (i.e., quantum spin-Hall insulators) that are smooth functions of k on the entire Brillouin-zone torus. As the initial step, the occupied subspace of the insulator is decomposed into a direct sum of two “Chern bands,” ... [Phys. Rev. B 85, 115415] Published Mon Mar 12, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Optical conductivity of polarons: Double phonon cloudconcept verified by diagrammatic Monte Carlo simulations (2012)

G. De Filippis, V. Cataudella, A. S. Mishchenko, and N. Nagaosa

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): G. De Filippis, V. Cataudella, A. S. Mishchenko, and N. Nagaosa We study theoretically a fundamental issue in solids: the evolution of the optical spectra of polaron as the electron-phonon coupling increases. By comparing the exact results obtained by the diagrammatic Monte Carlo method and the data obtained through exact diagonalization within an appropriate su... [Phys. Rev. B 85, 094302] Published Fri Mar 09, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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^{4}He crystal quality and rotational response in a transparent torsional oscillator (2012)

A. D. Fefferman, X. Rojas, A. Haziot, S. Balibar, J. T. West, and M. H. W. Chan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-14

Beschreibung: Author(s): A. D. Fefferman, X. Rojas, A. Haziot, S. Balibar, J. T. West, and M. H. W. Chan We have studied natural purity 4 He single crystals and polycrystals between 10 and 600 mK using a torsional oscillator with a 2 cm 3 rigid cell made of sapphire with a smooth geometry. As the temperature was lowered, we observed sample-dependent but reproducible resonant frequency shifts that could b... [Phys. Rev. B 85, 094103] Published Tue Mar 13, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Surface properties of the clean and Au/Pd covered Fe_{3}O_{4}(111): DFT andDFT+U study (2012)

Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Adam Kiejna, Tomasz Ossowski, and Tomasz Pabisiak The spin-density-functional theory (DFT) and DFT+ U with the Hubbard U term accounting for on-site Coulomb interactions were applied to investigate structure, stability, and electronic properties of different terminations of the Fe 3 O 4 (111) surface. All terminations of the ferrimagnetic Fe 3 O 4 (111) sur... [Phys. Rev. B 85, 125414] Published Tue Mar 13, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Spectroscopic investigations of Eu^{3+}:Y_{2}SiO_{5} for quantum memory applications (2012)

B. Lauritzen, N. Timoney, N. Gisin, M. Afzelius, H. de Riedmatten, Y. Sun, R. M. Macfarlane, and R. L. Cone

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): B. Lauritzen, N. Timoney, N. Gisin, M. Afzelius, H. de Riedmatten, Y. Sun, R. M. Macfarlane, and R. L. Cone Rare-earth-ion-doped solids are promising materials as light-matter interfaces for quantum applications. Europium doped into an yttrium orthosilicate crystal in particular has interesting coherence properties and a suitable ground-state energy-level structure for a quantum memory for light. In this ... [Phys. Rev. B 85, 115111] Published Wed Mar 14, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Symmetry classification of energy bands in graphene (2012)

E. Kogan and V. U. Nazarov

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): E. Kogan and V. U. Nazarov We present the results of the first-principle calculations of the energy bands in graphene and their symmetry classification. The valence bands and four lowest conduction bands are classified according to their symmetry at points Γ and K . Merging of the bands is interpreted in the framework of the g... [Phys. Rev. B 85, 115418] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Resonant Rayleigh scattering as a probe of spin polarization in a two-dimensional electron system (2012)

L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): L. V. Kulik, K. Ovchinnikov, A. S. Zhuravlev, V. E. Bisti, I. V. Kukushkin, S. Schmult, and W. Dietsche We investigated the resonant Rayleigh scattering in a two-dimensional electron system (2DES) and developed a differential technique for obtaining high-quality RRS spectra. Oscillations of the RRS scattering efficiency are observed. The oscillations are explained in terms of redistribution of electro... [Phys. Rev. B 85, 113403] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Strong potential impurities on the surface of a topological insulator (2012)

Annica M. Black-Schaffer and Alexander V. Balatsky

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Annica M. Black-Schaffer and Alexander V. Balatsky Topological insulators (TIs) are said to be stable against nonmagnetic impurity scattering due to suppressed backscattering in the Dirac surface states. We solve a lattice model of a three-dimensional TI in the presence of strong potential impurities and find that both the Dirac point and low-energy... [Phys. Rev. B 85, 121103] Published Wed Mar 14, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Dimerization-induced spin-charge coupling in one-dimensional Mott insulators revealed by femtosecond reflection spectroscopy of Rb-tetracyanoquinodimethane salts (2012)

H. Uemura, N. Maeshima, K. Yonemitsu, and H. Okamoto

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): H. Uemura, N. Maeshima, K. Yonemitsu, and H. Okamoto Effects of lattice dimerizations on charge dynamics in one-dimensional (1D) half-filled Mott insulators were studied using an organic compound, Rb-tetracyanoquinodimethane (TCNQ). First, we investigated the presence of the dimeric molecular displacements by the measurements of polarized Raman spectr... [Phys. Rev. B 85, 125112] Published Wed Mar 14, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Birefringent nanostructured composite materials (2012)

Bernardo S. Mendoza and W. Luis Mochán

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Bernardo S. Mendoza and W. Luis Mochán We use a very efficient recursive method to calculate the effective optical response of materials made up of arbitrarily shaped dielectric inclusions arranged in periodic 2D arrays within a metal matrix with a lattice constant much smaller than the wavelength of the incident light, so that we may ne... [Phys. Rev. B 85, 125418] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Direct experimental determination of the K 2p and Cl 2p core-level binding energy shifts between molecular and solid KCl: Line broadening effects (2012)

M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. Patanen, G. M. Bancroft, S. Aksela, and H. Aksela Using a technique used previously for metals, the K 2 p and Cl 2 p photoelectron spectra of KCl have been measured from the molecular vapor and nonconductor solid simultaneously —a direct measurement for a nonconductor. The Cl 2 p core level in bulk-solid KCl has a 0.79-eV larger binding energy than its... [Phys. Rev. B 85, 125419] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Phase diagram as a function of doping level and pressure in the Eu_{1−x}La_{x}Fe_{2}As_{2} system (2012)

M. Zhang, J. J. Ying, Y. J. Yan, A. F. Wang, X. F. Wang, Z. J. Xiang, G. J. Ye, P. Cheng, X. G. Luo, Jiangping Hu, and X. H. Chen

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. Zhang, J. J. Ying, Y. J. Yan, A. F. Wang, X. F. Wang, Z. J. Xiang, G. J. Ye, P. Cheng, X. G. Luo, Jiangping Hu, and X. H. Chen We establish the phase diagram of the Eu 1− x La x Fe 2 As 2 system as a function of doping level x and pressure by measuring the resistivity and magnetic susceptibility. Increased pressure can suppress the spin-density-wave (SDW) and structural transitions very efficiently, while enhancing the antiferromag... [Phys. Rev. B 85, 092503] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Mott glass to superfluid transition for random bosons in two dimensions (2012)

S. Iyer, D. Pekker, and G. Refael

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): S. Iyer, D. Pekker, and G. Refael We study the zero-temperature superfluid-insulator transition for a two-dimensional model of interacting, lattice bosons in the presence of quenched disorder and particle-hole symmetry. We follow the approach of a recent series of papers by Altman, Kafri, Polkovnikov, and Refael, in which the strong... [Phys. Rev. B 85, 094202] Published Wed Mar 14, 2012

Schlagwort(e): Inhomogeneous, disordered, and partially ordered systems

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Proximity effect at superconducting Sn-Bi_{2}Se_{3} interface (2012)

Fan Yang, Yue Ding, Fanming Qu, Jie Shen, Jun Chen, Zhongchao Wei, Zhongqing Ji, Guangtong Liu, Jie Fan, Changli Yang, Tao Xiang, and Li Lu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Fan Yang, Yue Ding, Fanming Qu, Jie Shen, Jun Chen, Zhongchao Wei, Zhongqing Ji, Guangtong Liu, Jie Fan, Changli Yang, Tao Xiang, and Li Lu We have investigated the conductance spectra of Sn-Bi 2 Se 3 interface junctions down to 250 mK and in different magnetic fields. A number of conductance anomalies were observed below the superconducting transition temperature of Sn, including a small gap that is different from that of Sn, and a zero-b... [Phys. Rev. B 85, 104508] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Anisotropic vortex lattice structures in the FeSe superconductor (2012)

Hsiang-Hsuan Hung, Can-Li Song, Xi Chen, Xucun Ma, Qi-kun Xue, and Congjun Wu

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Hsiang-Hsuan Hung, Can-Li Song, Xi Chen, Xucun Ma, Qi-kun Xue, and Congjun Wu In the recent work by Song et al. [ Science 332 1410 (2011) ], the scanning tunneling spectroscopy experiment in the stoichiometric FeSe revealed evidence for nodal superconductivity and strong anisotropy. The nodal structure can be explained with the extended s -wave pairing structure with the mixtu... [Phys. Rev. B 85, 104510] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Mechanism for p-type conduction in polycrystalline indium oxide films (2012)

Jolanta Stankiewicz, María Pilar Lozano, and Francisco Villuendas

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Jolanta Stankiewicz, María Pilar Lozano, and Francisco Villuendas We report results of ac impedance measurements which we have obtained from intrinsic indium oxide films under UV irradiation and in darkness. We find two distinct contributions to the ac conductivity. One of them is brought about by grain boundaries, and the other one by inversion layers, which are ... [Phys. Rev. B 85, 125306] Published Wed Mar 14, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Theoretical investigation of the inverse Faraday effect via a stimulated Raman scattering process (2012)

Daria Popova, Andreas Bringer, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Daria Popova, Andreas Bringer, and Stefan Blügel We study theoretically the origin and mechanism of the ultrafast inverse Faraday effect, which is a magneto-optical effect, attracting much interest nowadays. Laser-induced subpicosecond spin dynamics in hydrogenlike systems and isolated many-electron atoms are investigated in order to get insight i... [Phys. Rev. B 85, 094419] Published Wed Mar 14, 2012

Schlagwort(e): Magnetism

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Intrinsic defects in multiferroic BiFeO_{3} and their effect on magnetism (2012)

Tula R. Paudel, Sitaram S. Jaswal, and Evgeny Y. Tsymbal

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Tula R. Paudel, Sitaram S. Jaswal, and Evgeny Y. Tsymbal We investigate the energetics of the intrinsic defects in bulk multiferroic BiFeO 3 and explore their implication for magnetization using a first-principles approach based on density functional theory. We find that the dominant defects in oxidizing (oxygen-rich) conditions are Bi and Fe vacancies and... [Phys. Rev. B 85, 104409] Published Wed Mar 14, 2012

Schlagwort(e): Magnetism

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Electronic excitations around the substituted atom in La_{2}Cu_{1−y}Ni_{y}O_{4} as seen via resonant inelastic x-ray scattering (2012)

K. Ishii, K. Tsutsui, K. Ikeuchi, I. Jarrige, J. Mizuki, H. Hiraka, K. Yamada, T. Tohyama, S. Maekawa, Y. Endoh, H. Ishii, and Y. Q. Cai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): K. Ishii, K. Tsutsui, K. Ikeuchi, I. Jarrige, J. Mizuki, H. Hiraka, K. Yamada, T. Tohyama, S. Maekawa, Y. Endoh, H. Ishii, and Y. Q. Cai We perform a resonant inelastic x-ray scattering (RIXS) study of Ni-substituted La 2 CuO 4 and Cu-substituted La 2 NiO 4 . Resonantly enhanced charge-transfer excitations are successfully observed by tuning the incident photon energy to the K edge of the substituted element. These excitations display a ver... [Phys. Rev. B 85, 104509] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Electronic bound states in the continuum above (Ga,In)(As,N)/(Al,Ga)As quantum wells (2012)

Asaf Albo, Dan Fekete, and Gad Bahir

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Asaf Albo, Dan Fekete, and Gad Bahir Using intersubband photocurrent spectroscopy, we have demonstrated that a bound state in the continuum exists above (Ga,In)(As,N)/(Al,Ga)As quantum wells. The photocurrent spectrum and responsivity show that the excited-state energies lie far above the potential barrier of the quantum well, and the ... [Phys. Rev. B 85, 115307] Published Wed Mar 14, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Topological charge pumping effect by the magnetization dynamics on the surface of three-dimensional topological insulators (2012)

Hiroaki T. Ueda, Akihito Takeuchi, Gen Tatara, and Takehito Yokoyama

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Hiroaki T. Ueda, Akihito Takeuchi, Gen Tatara, and Takehito Yokoyama We discuss a current dynamics on the surface of a three-dimensional topological insulator induced by magnetization precession of an attached ferromagnet. It is found that the magnetization dynamics generates a direct charge current when the precession axis is within the surface plane. This rectifica... [Phys. Rev. B 85, 115110] Published Wed Mar 14, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Squeezed noise due to two-level system defects in superconducting resonator circuits (2012)

So Takei, Victor M. Galitski, and Kevin D. Osborn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): So Takei, Victor M. Galitski, and Kevin D. Osborn Motivated by recent surprising experimental results for the noise output of superconducting microfabricated resonators used in quantum computing applications and astronomy, we develop a fully quantum theoretical model to describe quantum dynamics of these circuits. Building on theoretical techniques... [Phys. Rev. B 85, 104507] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Electron localization in epitaxial graphene on Ru(0001) determined by moiré corrugation (2012)

D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): D. Stradi, S. Barja, C. Díaz, M. Garnica, B. Borca, J. J. Hinarejos, D. Sánchez-Portal, M. Alcamí, A. Arnau, A. L. Vázquez de Parga, R. Miranda, and F. Martín The interpretation of scanning tunneling spectroscopy (STS) and scanning tunneling microscopy measurements of epitaxial graphene on lattice-mismatched substrates is a challenging problem, because of the spatial modulation in the electronic structure imposed by the formation of a moiré pattern. Here ... [Phys. Rev. B 85, 121404] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Magnetic and transport properties of iron-platinum arsenide Ca_{10}(Pt_{4-δ}As_{8})(Fe_{2-x}Pt_{x}As_{2})_{5} single crystal (2012)

Qing-Ping Ding, Yuji Tsuchiya, Shyam Mohan, Toshihiro Taen, Yasuyuki Nakajima, and Tsuyoshi Tamegai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Qing-Ping Ding, Yuji Tsuchiya, Shyam Mohan, Toshihiro Taen, Yasuyuki Nakajima, and Tsuyoshi Tamegai We report superconducting properties of single crystalline Ca 10 (Pt 4- δ As 8 )(Fe 2- x Pt x As 2 ) 5 by x-ray diffraction, magnetization, resistivity, and magneto-optical imaging measurements. The magnetization measurements reveal a fish-tail hysteresis loop and relatively high critical current density J c ∼ 0.8 ... [Phys. Rev. B 85, 104512] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Crossover critical behavior of Ga_{1−x}Mn_{x}As (2012)

Sh. U. Yuldashev, Kh. T. Igamberdiev, Y. H. Kwon, Sanghoon Lee, X. Liu, J. K. Furdyna, A. G. Shashkov, and T. W. Kang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Sh. U. Yuldashev, Kh. T. Igamberdiev, Y. H. Kwon, Sanghoon Lee, X. Liu, J. K. Furdyna, A. G. Shashkov, and T. W. Kang The critical behavior of the ferromagnetic semiconductor Ga 1− x Mn x As with different concentrations of Mn was experimentally studied by thermal diffusivity measurements in close vicinity of the Curie temperature. Because the inverse of the thermal diffusivity has the same critical behavior as the spec... [Phys. Rev. B 85, 125202] Published Wed Mar 14, 2012

Schlagwort(e): Semiconductors I: bulk

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Growth and decay of hcp-like Cu hut-shaped structures on W(100) (2012)

Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Tjeerd R. J. Bollmann, Raoul van Gastel, Herbert Wormeester, Harold J. W. Zandvliet, and Bene Poelsema We have studied both the morphology and structure of thin Cu deposits on W(100) during growth and desorption, using low-energy electron microscopy (LEEM) and selective area low-energy electron diffraction ( μ LEED). During growth at 674 K hut-shaped Cu crystallites with steep facets ( 〉 54 ∘ ) coexist... [Phys. Rev. B 85, 125417] Published Wed Mar 14, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Inhomogeneous state of the extended t-J model on a square lattice: A variational Monte Carlo and Gutzwiller approximation study (2012)

Chung-Pin Chou and Ting-Kuo Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): Chung-Pin Chou and Ting-Kuo Lee We carry out the variational Monte Carlo calculation to examine spatially inhomogeneous states in hole- and electron-doped cuprates. By using Gutzwiller approximation, we consider the excitations, arising from charge density, spin density, and pair field, of the mean-field ground state of the t - J mo... [Phys. Rev. B 85, 104511] Published Wed Mar 14, 2012

Schlagwort(e): Superfluidity and superconductivity

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Evidence of oxygen-dependent modulation in LuFe_{2}O_{4} (2012)

J. Bourgeois, M. Hervieu, M. Poienar, A. M. Abakumov, E. Elkaïm, M. T. Sougrati, F. Porcher, F. Damay, J. Rouquette, G. Van Tendeloo, A. Maignan, J. Haines, and C. Martin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-07

Beschreibung: Author(s): J. Bourgeois, M. Hervieu, M. Poienar, A. M. Abakumov, E. Elkaïm, M. T. Sougrati, F. Porcher, F. Damay, J. Rouquette, G. Van Tendeloo, A. Maignan, J. Haines, and C. Martin A polycrystalline sample of LuFe 2 O 4 has been investigated by means of powder synchrotron x-ray and neutron diffraction and transmission electron microscopy (TEM), along with Mössbauer spectroscopy and transport and magnetic properties. A monoclinic distortion is unambiguously evidenced, and the crys... [Phys. Rev. B 85, 064102] Published Mon Feb 06, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Finite-length charge-density waves on terminated atomic wires (2012)

Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-05

Beschreibung: Author(s): Jin Sung Shin, Kyung-Deuk Ryang, and Han Woong Yeom Finite-size effects in charge-density waves (CDWs) were unveiled using scanning tunneling microscopy for metallic atomic wires on the Au/Si(553) surface, as terminated by adsorbate impurities. We found that CDW formed at low temperature adopts the finite-length boundary condition in two distinct way... [Phys. Rev. B 85, 073401] Published Fri Feb 03, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Quasiclassical and ultraquantum decay of superfluid turbulence (2012)

A. W. Baggaley, C. F. Barenghi, and Y. A. Sergeev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-05

Beschreibung: Author(s): A. W. Baggaley, C. F. Barenghi, and Y. A. Sergeev We address a question which, after a decade-long discussion, still remains open: what is the nature of the ultraquantum regime of decay of quantum turbulence? The model developed in this work reproduces both the ultraquantum and the quasiclassical decay regimes and explains their hydrodynamical natu... [Phys. Rev. B 85, 060501] Published Fri Feb 03, 2012

Schlagwort(e): Superfluidity and superconductivity

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Correlation effects in bistability at the nanoscale: Steady state and beyond (2012)

E. Khosravi, A.-M. Uimonen, A. Stan, G. Stefanucci, S. Kurth, R. van Leeuwen, and E. K. U. Gross

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): E. Khosravi, A.-M. Uimonen, A. Stan, G. Stefanucci, S. Kurth, R. van Leeuwen, and E. K. U. Gross The possibility of finding multistability in the density and current of an interacting nanoscale junction coupled to semi-infinite leads is studied at various levels of approximation. The system is driven out of equilibrium by an external bias and the nonequilibrium properties are determined by real... [Phys. Rev. B 85, 075103] Published Fri Feb 03, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Single-valley quantum Hall ferromagnet in a dilute Mg_{x}Zn_{1−x}O/ZnO strongly correlated two-dimensional electron system (2012)

Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and M. Kawasaki

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Y. Kozuka, A. Tsukazaki, D. Maryenko, J. Falson, C. Bell, M. Kim, Y. Hikita, H. Y. Hwang, and M. Kawasaki We investigate the spin susceptibility ( g * m * ) of dilute two-dimensional (2D) electrons confined at the Mg x Zn 1− x O/ZnO heterointerface. Magnetotransport measurements show a four-fold enhancement of g * m * , dominated by the increase in the Landé g -factor. The g -factor enhancement leads to a ferromagnetic... [Phys. Rev. B 85, 075302] Published Fri Feb 03, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Large enhancement of thermoelectric effects in a double quantum dot system due to interference and Coulomb correlation phenomena (2012)

Piotr Trocha and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Piotr Trocha and Józef Barnaś Thermoelectric effects in a double quantum dot system coupled to external magnetic/nonmagnetic leads are investigated theoretically. The basic thermoelectric transport characteristics, like thermopower, electronic contribution to heat conductance, and the corresponding figure of merit, have been cal... [Phys. Rev. B 85, 085408] Published Fri Feb 03, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Resonant polaron-assisted tunneling of strongly interacting electrons through a single-level vibrating quantum dot (2012)

Gleb A. Skorobagatko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): 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 Luttinge... [Phys. Rev. B 85, 075310] Published Fri Feb 10, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Identification of magnetic dopants on the surfaces of topological insulators: Experiment and theory for Fe on Bi_{2}Te_{3}(111) (2012)

D. West, Y. Y. Sun, S. B. Zhang, T. Zhang, Xucun Ma, P. Cheng, Y. Y. Zhang, X. Chen, J. F. Jia, and Q. K. Xue

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): D. West, Y. Y. Sun, S. B. Zhang, T. Zhang, Xucun Ma, P. Cheng, Y. Y. Zhang, X. Chen, J. F. Jia, and Q. K. Xue Magnetic impurities are crucial for probing spin-polarized topological surface states. Scanning tunneling microscopy (STM) studies of Fe on the Bi 2 Te 3 (111) surface are preformed and unveil distinct impurity structures of unknown origin which exhibit temperature-dependent characteristics. Using densi... [Phys. Rev. B 85, 081305] Published Tue Feb 14, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Upper critical field and thermally activated flux flow in single-crystalline Tl_{0.58}Rb_{0.42}Fe_{1.72}Se_{2} (2012)

L. Jiao, Y. Kohama, J. L. Zhang, H. D. Wang, B. Maiorov, F. F. Balakirev, Y. Chen, L. N. Wang, T. Shang, M. H. Fang, and H. Q. Yuan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): L. Jiao, Y. Kohama, J. L. Zhang, H. D. Wang, B. Maiorov, F. F. Balakirev, Y. Chen, L. N. Wang, T. Shang, M. H. Fang, and H. Q. Yuan The upper critical field μ 0 H c 2 ( T c ) of Tl 0.58 Rb 0.42 Fe 1.72 Se 2 single crystals has been determined by means of measuring the electrical resistivity in both a pulsed magnetic field ( ∼ 58 T ) and a dc magnetic field ( ∼ 14 T ). It is found that μ 0 H c 2 linearly increases with decreasing temperature for H ∥ c ,... [Phys. Rev. B 85, 064513] Published Wed Feb 15, 2012

Schlagwort(e): Superfluidity and superconductivity

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First-principles study of structural and vibrational properties of SrZrO_{3} (2012)

Safari Amisi, Eric Bousquet, Karume Katcho, and Philippe Ghosez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): Safari Amisi, Eric Bousquet, Karume Katcho, and Philippe Ghosez Using first-principles calculations, we investigate the electronic, structural, and vibrational properties of SrZrO 3 . We start from the high-symmetry cubic perovskite phase, for which the phonon dispersion curves are reported. We point out the coexistence of structural antiferrodistortive instabilit... [Phys. Rev. B 85, 064112] Published Wed Feb 15, 2012

Schlagwort(e): Structure, structural phase transitions, mechanical properties, defects

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Surface spin polarization of the nonstoichiometric Heusler alloy Co_{2}MnSi (2012)

Jan-Peter Wüstenberg, Roman Fetzer, Martin Aeschlimann, Mirko Cinchetti, Jan Minár, Jürgen Braun, Hubert Ebert, Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Jan-Peter Wüstenberg, Roman Fetzer, Martin Aeschlimann, Mirko Cinchetti, Jan Minár, Jürgen Braun, Hubert Ebert, Takayuki Ishikawa, Tetsuya Uemura, and Masafumi Yamamoto Using a combined approach of spin-resolved photoemission spectroscopy, band structure and photoemission calculations we investigate the influence of bulk defects and surface states on the spin polarization of nonstoichiometric Co 2 Mn α Si thin films (with α =0.69 and α =1.19 ) with bulk L 2 1 order. We find... [Phys. Rev. B 85, 064407] Published Wed Feb 15, 2012

Schlagwort(e): Magnetism

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Unusually long free carrier lifetime and metal-insulator band offset in vanadium dioxide (2012)

Chris Miller, Mark Triplett, Joel Lammatao, Joonki Suh, Deyi Fu, Junqiao Wu, and Dong Yu

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Chris Miller, Mark Triplett, Joel Lammatao, Joonki Suh, Deyi Fu, Junqiao Wu, and Dong Yu Single crystalline vanadium dioxide (VO 2 ) nanobeams offer an ideal material basis for exploring the widely observed insulator–metal transition in strongly correlated materials. Here, we investigate nonequilibrium carrier dynamics and electronic structure in single crystalline VO 2 nanobeam devices us... [Phys. Rev. B 85, 085111] Published Wed Feb 15, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Gate bias polarity dependent H migration and O vacancy generation through Si=O–H complex formation in SiO_{2}/Si(100) (2012)

Koichi Kato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): Koichi Kato We studied H-atom migration in SiO 2 /Si systems triggering O vacancy generation based on first-principles calculations. The migrating H atoms in SiO 2 have been found to be mostly negatively charged irrespective of the charge-state polarity in the systems because strong charge transfer from the Si to ... [Phys. Rev. B 85, 085307] Published Wed Feb 15, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Physical properties of A_{x}Fe_{2−y}S_{2} (A=K, Rb, and Cs) single crystals (2012)

J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): J. J. Ying, Z. J. Xiang, Z. Y. Li, Y. J. Yan, M. Zhang, A. F. Wang, X. G. Luo, and X. H. Chen We successfully synthesized two new compounds, Rb x Fe 2− y S 2 and Cs x Fe 2− y S 2 , which are isostructural with a K x Fe 2− y Se 2 superconductor. We systematically investigated the resistivity, magnetism, and thermoelectric power of A x Fe 2− y S 2 ( A =K , Rb, and Cs) single crystals. High-temperature resistivity and mag... [Phys. Rev. B 85, 054506] Published Thu Feb 16, 2012

Schlagwort(e): Superfluidity and superconductivity

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Spin-selective transport through helical molecular systems (2012)

R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): R. Gutierrez, E. Díaz, R. Naaman, and G. Cuniberti Highly spin-selective transport of electrons through a helically shaped electrostatic potential is demonstrated in the frame of a minimal model approach. The effect is significant even for weak spin-orbit coupling. Two main factors determine the selectivity: an unconventional Rashba-like spin-orbit ... [Phys. Rev. B 85, 081404] Published Thu Feb 16, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Role of lone pair electrons in determining the optoelectronic properties of BiCuOSe (2012)

S. Sallis, L. F. J. Piper, J. Francis, J. Tate, H. Hiramatsu, T. Kamiya, and H. Hosono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): S. Sallis, L. F. J. Piper, J. Francis, J. Tate, H. Hiramatsu, T. Kamiya, and H. Hosono The electronic structure of the oxychalcogenides LaCuOSe and BiCuOSe has been studied using O K -edge x-ray emission spectroscopy, x-ray absorption spectroscopy, and density functional theory, in order to examine the effects of the M 3+ ion configurations. The known distortion of the BiO layers in BiC... [Phys. Rev. B 85, 085207] Published Thu Feb 16, 2012

Schlagwort(e): Semiconductors I: bulk

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Theory of thermal spin-charge coupling in electronic systems (2012)

Benedikt Scharf, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): Benedikt Scharf, Alex Matos-Abiague, Igor Žutić, and Jaroslav Fabian The interplay between spin transport and thermoelectricity offers several novel ways of generating, manipulating, and detecting nonequilibrium spin in a wide range of materials. Here, we formulate a phenomenological model in the spirit of the standard model of electrical spin injection to describe t... [Phys. Rev. B 85, 085208] Published Thu Feb 16, 2012

Schlagwort(e): Semiconductors I: bulk

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Analyzing the frequency shift of physiadsorbed CO_{2} in metal organic framework materials (2012)

Yanpeng Yao, Nour Nijem, Jing Li, Yves J. Chabal, David C. Langreth, and T. Thonhauser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): Yanpeng Yao, Nour Nijem, Jing Li, Yves J. Chabal, David C. Langreth, and T. Thonhauser Combining first-principles density functional theory simulations with IR and Raman experiments, we determine the frequency shift of vibrational modes of CO 2 when physiadsorbed in the isostructural metal organic framework materials Mg-MOF74 and Zn-MOF74. Surprisingly, we find that the resulting chang... [Phys. Rev. B 85, 064302] Published Thu Feb 16, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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Publisher’s Note: Influence of strain on anisotropic thermoelectric transport in Bi_{2}Te_{3} and Sb_{2}Te_{3} [Phys. Rev. B 84, 165214 (2011)] (2012)

N. F. Hinsche, B. Yu. Yavorsky, I. Mertig, and P. Zahn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-18

Beschreibung: Author(s): N. F. Hinsche, B. Yu. Yavorsky, I. Mertig, and P. Zahn [Phys. Rev. B 85, 089902] Published Fri Feb 17, 2012

Schlagwort(e): Errata

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Dynamics of successive minor hysteresis loops (2012)

Y. W. Windsor, A. Gerber, and M. Karpovski

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-18

Beschreibung: Author(s): Y. W. Windsor, A. Gerber, and M. Karpovski Cumulative growth of successive minor hysteresis loops in Co/Pd multilayers with perpendicular anisotropy was studied in the context of time-dependent magnetization reversal dynamics. We show that in disordered ferromagnets, where magnetization reversal involves nucleation, domains’ expansion, and d... [Phys. Rev. B 85, 064409] Published Fri Feb 17, 2012

Schlagwort(e): Magnetism

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Sustainability, Vol. 4, Pages 257-277: Problems with Reporting and Evaluating Mining Industry Community Development Projects: A Case Study from Tanzania (2012)

Jody Emel; Madoshi H. Makene; Esther Wangari

MDPI Publishing

In: Sustainability

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Publikationsdatum: 2012-02-21

Beschreibung: Reporting on contributions to community development is one way gold mining companies communicate the expanse and depth of their commitment to social responsibility. These projects are intended to provide the mine-proximate communities with some of the wealth and other benefits generated by mine development in their locales. We raise questions about reporting and evaluation of community development projects undertaken by AngloGold Ashanti in the two communities of Nyakabale and Nyamalembo, near its Geita mining projects in the Lake Victoria goldfields of Tanzania. We use archival data and data obtained from field research conducted during different periods throughout 2005, 2007 and 2010 to compare what the company reports to have done with what is found on the ground. Our findings revealed that the corporate reporting is misleading, ambiguous, and omissive. Much of the effort labeled “community development” benefited the companies directly via infrastructure development, food supplies to the mine cafeteria, and worker health. We argue that, if Corporate Social Responsibility (CSR) projects are to be the primary way local people directly benefit from mine development, the relationship between the value of those projects and the wealth taken from the location should be considered, community projects should be well defined and differentiated from company-oriented projects, and community representatives should participate in monitoring the success and impact of community development projects.

Digitale ISSN: 2071-1050

Thema: Energietechnik

Publiziert von MDPI Publishing

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First-principles description of anomalously low lattice thermal conductivity in thermoelectric Cu-Sb-Se ternary semiconductors (2012)

Yongsheng Zhang, Eric Skoug, Jeffrey Cain, Vidvuds Ozoliņš, Donald Morelli, and C. Wolverton

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Yongsheng Zhang, Eric Skoug, Jeffrey Cain, Vidvuds Ozoliņš, Donald Morelli, and C. Wolverton Experimental measurements have recently shown that Cu 3 SbSe 3 exhibits anomalously low and nearly temperature-independent lattice thermal conductivity, whereas Cu 3 SbSe 4 does not exhibit this anomalous behavior. To understand this strong distinction between these two seemingly similar compounds, we per... [Phys. Rev. B 85, 054306] Published Tue Feb 21, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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Magnetic phase diagram of the frustrated S=1/2 chain magnet LiCu_{2}O_{2} (2012)

A. A. Bush, V. N. Glazkov, M. Hagiwara, T. Kashiwagi, S. Kimura, K. Omura, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): A. A. Bush, V. N. Glazkov, M. Hagiwara, T. Kashiwagi, S. Kimura, K. Omura, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev We present the results of the magnetization and dielectric constant measurements on untwinned single-crystal samples of the frustrated S =1/2 chain cuprate LiCu 2 O 2 . Magnetic phase transitions were observed. A spin-flop transition of the spiral spin plane was observed for the field orientations H ∥ a , b ... [Phys. Rev. B 85, 054421] Published Tue Feb 21, 2012

Schlagwort(e): Magnetism

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Single-crystal study of the kagome antiferromagnet U_{3}Ru_{4}Al_{12} (2012)

R. Troć, M. Pasturel, O. Tougait, A. P. Sazonov, A. Gukasov, C. Sułkowski, and H. Noël

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): R. Troć, M. Pasturel, O. Tougait, A. P. Sazonov, A. Gukasov, C. Sułkowski, and H. Noël A ternary intermetallic compound, U 3 Ru 4 Al 12 in a single-crystal form, was studied by measurement of susceptibility, magnetization, electrical resistivity, magnetoresistivity, thermopower, and heat capacity, as well as neutron diffraction, revealing that this aluminide is an antiferromagnetically ord... [Phys. Rev. B 85, 064412] Published Tue Feb 21, 2012

Schlagwort(e): Magnetism

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Systematic low-energy effective field theory for magnons and holes in an antiferromagnet on the honeycomb lattice (2012)

F. Kämpfer, B. Bessire, M. Wirz, C. P. Hofmann, F.-J. Jiang, and U.-J. Wiese

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): F. Kämpfer, B. Bessire, M. Wirz, C. P. Hofmann, F.-J. Jiang, and U.-J. Wiese Based on a symmetry analysis of the microscopic Hubbard and t - J models, a systematic low-energy effective field theory is constructed for hole-doped antiferromagnets on the honeycomb lattice. In the antiferromagnetic phase, doped holes are massive due to the spontaneous breakdown of the SU(2) s symme... [Phys. Rev. B 85, 075123] Published Tue Feb 21, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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First-principles study of intermixing and polarization at the DyScO_{3}/SrTiO_{3} interface (2012)

K. Rahmanizadeh, G. Bihlmayer, M. Luysberg, and S. Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): K. Rahmanizadeh, G. Bihlmayer, M. Luysberg, and S. Blügel The polar-to-nonpolar interface of DyScO 3 and SrTiO 3 was studied using density functional theory. Due to the polar discontinuity arising from nominally charged DyO or ScO 2 layers, sharp interfaces induce a strong ferroelectriclike polarization in the SrTiO 3 , while in chemically mixed interfaces this... [Phys. Rev. B 85, 075314] Published Tue Feb 21, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Tunneling magnetic effect in heterostructures with paramagnetic impurities (2012)

I. V. Rozhansky, N. S. Averkiev, and E. Lähderanta

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): I. V. Rozhansky, N. S. Averkiev, and E. Lähderanta An effect of paramagnetic impurity located in a vicinity of a quantum well (QW) on spin polarization of the carriers in the QW is analyzed theoretically. Within the approach of Bardeen's tunneling Hamiltonian the problem is formulated in terms of the Anderson-Fano model of configuration interaction ... [Phys. Rev. B 85, 075315] Published Tue Feb 21, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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Adsorbate-induced reconstruction by C_{60} on close-packed metal surfaces: Mechanism for different types of reconstruction (2012)

Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-02-22

Beschreibung: Author(s): Xing-Qiang Shi, Michel A. Van Hove, and Rui-Qin Zhang Recent studies reveal that reconstruction of close-packed metal surfaces induced by C 60 adsorption is the rule rather than the exception. Two types of reconstruction are reported for C 60 on different surfaces: (1) C 60 sinks into a 7-atom hole, such as on Cu(111); and (2) C 60 sits over a 1-atom hole,... [Phys. Rev. B 85, 075421] Published Tue Feb 21, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Effects of randomness on the critical temperature in quasi-two-dimensional organic superconductors (2012)

Enver Nakhmedov, Oktay Alekperov, and Reinhold Oppermann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Enver Nakhmedov, Oktay Alekperov, and Reinhold Oppermann The effects of nonmagnetic disorder on the critical temperature T c of organic weak-linked layered superconductors with singlet in-plane pairing are considered. A randomness in the interlayer Josephson coupling is shown to destroy phase coherence between the layers, and T c suppresses smoothly in a la... [Phys. Rev. B 86, 214513] Published Fri Dec 21, 2012

Schlagwort(e): Superfluidity and superconductivity

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Splitting of the zero-bias conductance peak as smoking gun evidence for the existence of the Majorana mode in a superconductor-semiconductor nanowire (2012)

S. Das Sarma, Jay D. Sau, and Tudor D. Stanescu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): S. Das Sarma, Jay D. Sau, and Tudor D. Stanescu Recent observations of a zero-bias conductance peak in tunneling transport measurements in superconductor-semiconductor nanowire devices provide evidence for the predicted zero-energy Majorana modes, but not the conclusive proof of their existence. We establish that direct observation of a splitting... [Phys. Rev. B 86, 220506] Published Fri Dec 21, 2012

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Quantum phase transition in Heisenberg-Kitaev model (2012)

Robert Schaffer, Subhro Bhattacharjee, and Yong Baek Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Robert Schaffer, Subhro Bhattacharjee, and Yong Baek Kim We explore the nature of the quantum phase transition between a magnetically ordered state with collinear spin pattern and a gapless Z 2 spin liquid in the Heisenberg-Kitaev model. We construct a slave particle mean-field theory for the Heisenberg-Kitaev model in terms of complex fermionic spinons. I... [Phys. Rev. B 86, 224417] Published Fri Dec 21, 2012

Schlagwort(e): Magnetism

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Vibrational dynamics of single-crystal YVO_{4} studied by polarized micro-Raman spectroscopy and ab initio calculations (2012)

Andrea Sanson, Marco Giarola, Barbara Rossi, Gino Mariotto, Enzo Cazzanelli, and Adolfo Speghini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Andrea Sanson, Marco Giarola, Barbara Rossi, Gino Mariotto, Enzo Cazzanelli, and Adolfo Speghini The vibrational properties of yttrium orthovanadate (YVO 4 ) single crystals, with tetragonal zircon structure, have been investigated by means of polarized micro-Raman spectroscopy and ab initio calculations. Raman spectra were taken at different polarizations and orientations carefully set by the us... [Phys. Rev. B 86, 214305] Published Fri Dec 21, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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Elastic relaxation behavior, magnetoelastic coupling, and order-disorder processes in multiferroic metal-organic frameworks (2012)

R. I. Thomson, P. Jain, A. K. Cheetham, and M. A. Carpenter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): R. I. Thomson, P. Jain, A. K. Cheetham, and M. A. Carpenter Resonant ultrasound spectroscopy has been used to analyze magnetic and ferroelectric phase transitions in two multiferroic metal-organic frameworks (MOFs) with perovskite-like structures [(CH 3 ) 2 NH 2 ]M(HCOO) 3 (DMA[M]F, M = Co, Mn). Elastic and anelastic anomalies are evident at both the magnetic order... [Phys. Rev. B 86, 214304] Published Fri Dec 21, 2012

Schlagwort(e): Dynamics, dynamical systems, lattice effects

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Longitudinal and transverse static spin fluctuations in layered ferromagnets and antiferromagnets (2012)

A. Katanin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): A. Katanin We analyze the momentum dependence of static susceptibilities of layered local-moment systems below Curie (Neel) temperature within the 1/ S expansion, the renormalization-group (RG) approach, and the first order of the 1/ N expansion. We argue that already at sufficiently low temperatures the previou... [Phys. Rev. B 86, 224416] Published Fri Dec 21, 2012

Schlagwort(e): Magnetism

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Transport criticality at the Mott transition in a triangular-lattice Hubbard model (2012)

Toshihiro Sato, Kazumasa Hattori, and Hirokazu Tsunetsugu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Toshihiro Sato, Kazumasa Hattori, and Hirokazu Tsunetsugu We study electric transport near the Mott metal-insulator transition in a triangular-lattice Hubbard model at half filling. We calculate optical conductivity σ ( ω ) based on a cellular dynamical mean-field theory including vertex corrections inside the cluster. Near the Mott critical end point, a Drud... [Phys. Rev. B 86, 235137] Published Fri Dec 21, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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YbPtGe_{2}: A multivalent charge-ordered system with an unusual spin pseudogap (2012)

Roman Gumeniuk, Rajib Sarkar, Christoph Geibel, Walter Schnelle, Carsten Paulmann, Michael Baenitz, Alexander A. Tsirlin, Violeta Guritanu, Jörg Sichelschmidt, Yuri Grin, and Andreas Leithe-Jasper

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Roman Gumeniuk, Rajib Sarkar, Christoph Geibel, Walter Schnelle, Carsten Paulmann, Michael Baenitz, Alexander A. Tsirlin, Violeta Guritanu, Jörg Sichelschmidt, Yuri Grin, and Andreas Leithe-Jasper We performed a study of the structural and physical properties of YbPtGe 2 . This compound is a multivalent charge-ordered system presenting an unusual spin pseudogap below 200 K. The crystal structure of YbPtGe 2 is refined from single-crystal and powder high-resolution synchrotron x-ray diffraction d... [Phys. Rev. B 86, 235138] Published Fri Dec 21, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Designer reflectors using spoof surface plasmons in the terahertz range (2012)

Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Jingbo Liu, Rajind Mendis, and Daniel M. Mittleman We show that spoof surface plasmons can be used to control the reflection of terahertz radiation at the output facet of a parallel-plate waveguide. Using a periodic groove pattern on the output face, reflectivity approaching 100% can be achieved within a limited spectral range. Unlike the convention... [Phys. Rev. B 86, 241405] Published Fri Dec 21, 2012

Schlagwort(e): Surface physics, nanoscale physics, low-dimensional systems

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Transforming Fabry-Pérot resonances into a Tamm mode (2012)

Maxim Durach and Anastasia Rusina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): Maxim Durach and Anastasia Rusina We propose an optical structure composed of two metal nanolayers enclosing a distributed Bragg reflector (DBR) mirror. The structure is an open photonic system whose bound modes are coupled to external radiation. We apply the special theoretical treatment based on inversion symmetry of the structure... [Phys. Rev. B 86, 235312] Published Fri Dec 21, 2012

Schlagwort(e): Semiconductors II: surfaces, interfaces, microstructures, and related topics

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