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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

Print ISSN: 1098-0121

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Thema: Physik

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Increased Superconducting Transition Temperature of a Niobium Thin Film Proximity Coupled to Gold Nanoparticles Using Linking Organic Molecules (2012)

Eran Katzir, Shira Yochelis, Felix Zeides, Nadav Katz, Yaov Kalcheim, Oded Millo, Gregory Leitus, Yuri Myasodeyov, Boris Ya. Shapiro, Ron Naaman, and Yossi Paltiel

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Eran Katzir, Shira Yochelis, Felix Zeides, Nadav Katz, Yaov Kalcheim, Oded Millo, Gregory Leitus, Yuri Myasodeyov, Boris Ya. Shapiro, Ron Naaman, and Yossi Paltiel The superconducting critical temperature, T C , of thin Nb films is significantly modified when gold nanoparticles (NPs) are chemically linked to the Nb film, with a consistent enhancement when using 3 nm long disilane linker molecules. The T C increases by up to 10% for certain linker length and NP si... [Phys. Rev. Lett. 108, 107004] Published Thu Mar 08, 2012

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Highly Confined Spin-Polarized Two-Dimensional Electron Gas in SrTiO_{3}/SrRuO_{3} Superlattices (2012)

Marcos Verissimo-Alves, Pablo García-Fernández, Daniel I. Bilc, Philippe Ghosez, and Javier Junquera

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Marcos Verissimo-Alves, Pablo García-Fernández, Daniel I. Bilc, Philippe Ghosez, and Javier Junquera We report first-principles characterization of the structural and electronic properties of (SrTiO 3 ) 5 /(SrRuO 3 ) 1 superlattices. We show that the system exhibits a spin-polarized two-dimensional electron gas, extremely confined to the 4 d orbitals of Ru in the SrRuO 3 layer. Every interface in the superl... [Phys. Rev. Lett. 108, 107003] Published Thu Mar 08, 2012

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Majorana Fermions and Exotic Surface Andreev Bound States in Topological Superconductors: Application to Cu_{x}Bi_{2}Se_{3} (2012)

Timothy H. Hsieh and Liang Fu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Timothy H. Hsieh and Liang Fu The recently discovered superconductor Cu x Bi 2 Se 3 is a candidate for three-dimensional time-reversal-invariant topological superconductors, which are predicted to have robust surface Andreev bound states hosting massless Majorana fermions. In this work, we analytically and numerically find the linear... [Phys. Rev. Lett. 108, 107005] Published Thu Mar 08, 2012

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Magnetism and Antiferroelectricity in MgB_{6} (2012)

Igor Popov, Nadjib Baadji, and Stefano Sanvito

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-09

Beschreibung: Author(s): Igor Popov, Nadjib Baadji, and Stefano Sanvito We report on a density functional theory study demonstrating the coexistence of weak ferromagnetism and antiferroelectricity in boron-deficient MgB 6 . A boron vacancy produces an almost one dimensional extended molecular orbital, which is responsible for the magnetic moment formation. Then, long-rang... [Phys. Rev. Lett. 108, 107205] Published Thu Mar 08, 2012

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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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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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Interplay between Nonequilibrium and Equilibrium Spin Torque Using Synthetic Ferrimagnets (2012)

Christian Klein, Cyril Petitjean, and Xavier Waintal

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-24

Beschreibung: Author(s): Christian Klein, Cyril Petitjean, and Xavier Waintal We discuss the current induced magnetization dynamics of spin valves F 0 |N|SyF where the free layer is a synthetic ferrimagnet SyF made of two ferromagnetic layers F 1 and F 2 coupled by RKKY exchange coupling. When the magnetic moment of the outer layer F 2 dominates the magnetization of the SyF , the s... [Phys. Rev. Lett. 108, 086601] Published Thu Feb 23, 2012

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Quantification of Correlations in Quantum Many-Particle Systems (2012)

Krzysztof Byczuk, Jan Kuneš, Walter Hofstetter, and Dieter Vollhardt

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-24

Beschreibung: Author(s): Krzysztof Byczuk, Jan Kuneš, Walter Hofstetter, and Dieter Vollhardt We introduce a well-defined and unbiased measure of the strength of correlations in quantum many-particle systems which is based on the relative von Neumann entropy computed from the density operator of correlated and uncorrelated states. The usefulness of this general concept is demonstrated by qua... [Phys. Rev. Lett. 108, 087004] Published Thu Feb 23, 2012

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Vortex Lattice Studies in CeCoIn_{5} with H⊥c (2012)

P. Das, J. S. White, A. T. Holmes, S. Gerber, E. M. Forgan, A. D. Bianchi, M. Kenzelmann, M. Zolliker, J. L. Gavilano, E. D. Bauer, J. L. Sarrao, C. Petrovic, and M. R. Eskildsen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-24

Beschreibung: Author(s): P. Das, J. S. White, A. T. Holmes, S. Gerber, E. M. Forgan, A. D. Bianchi, M. Kenzelmann, M. Zolliker, J. L. Gavilano, E. D. Bauer, J. L. Sarrao, C. Petrovic, and M. R. Eskildsen We present small angle neutron scattering studies of the vortex lattice (VL) in CeCoIn 5 with magnetic fields applied parallel ( H ) to the antinodal [100] and nodal [110] directions. For H ∥[100] , a single VL orientation is observed, while a 90° reorientation transition is found for H ∥[110] . For both f... [Phys. Rev. Lett. 108, 087002] Published Thu Feb 23, 2012

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Collective Nature of the Reentrant Integer Quantum Hall States in the Second Landau Level (2012)

N. Deng, A. Kumar, M. J. Manfra, L. N. Pfeiffer, K. W. West, and G. A. Csáthy

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-24

Beschreibung: Author(s): N. Deng, A. Kumar, M. J. Manfra, L. N. Pfeiffer, K. W. West, and G. A. Csáthy We report an unexpected sharp peak in the temperature dependence of the magnetoresistance of the reentrant integer quantum Hall states in the second Landau level. This peak defines the onset temperature of these states. We find that in different spin branches the onset temperatures of the reentrant ... [Phys. Rev. Lett. 108, 086803] Published Thu Feb 23, 2012

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Scaling of Dynamical Decoupling for Spin Qubits (2012)

J. Medford, Ł. Cywiński, C. Barthel, C. M. Marcus, M. P. Hanson, and A. C. Gossard

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-24

Beschreibung: Author(s): J. Medford, Ł. Cywiński, C. Barthel, C. M. Marcus, M. P. Hanson, and A. C. Gossard We investigate the scaling of coherence time T 2 with the number of π pulses n π in a singlet-triplet spin qubit using Carr-Purcell-Meiboom-Gill (CPMG) and concatenated dynamical decoupling (CDD) pulse sequences. For an even numbers of CPMG pulses, we find a power law T 2 ∝( n π ) γ e , with γ e =0.72±0.01 , ess... [Phys. Rev. Lett. 108, 086802] Published Thu Feb 23, 2012

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Two-Channel Kondo Physics in Two-Impurity Kondo Models (2012)

Andrew K. Mitchell, Eran Sela, and David E. Logan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-25

Beschreibung: Author(s): Andrew K. Mitchell, Eran Sela, and David E. Logan We consider the non-Fermi-liquid quantum critical state of the spin- S two-impurity Kondo model and its potential realization in a quantum dot device. Using conformal field theory and the numerical renormalization group, we show the critical point to be identical to that of the two-channel Kondo mode... [Phys. Rev. Lett. 108, 086405] Published Fri Feb 24, 2012

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Topological Surface States in Lead-Based Ternary Telluride Pb(Bi_{1-x}Sb_{x})_{2}Te_{4} (2012)

S. Souma, K. Eto, M. Nomura, K. Nakayama, T. Sato, T. Takahashi, Kouji Segawa, and Yoichi Ando

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-13

Beschreibung: Author(s): S. Souma, K. Eto, M. Nomura, K. Nakayama, T. Sato, T. Takahashi, Kouji Segawa, and Yoichi Ando We have performed angle-resolved photoemission spectroscopy on Pb(Bi 1-x Sb x ) 2 Te 4 , which is a member of lead-based ternary tellurides and has been theoretically proposed as a candidate for a new class of three-dimensional topological insulators. In PbBi 2 Te 4 , we found a topological surface state with a... [Phys. Rev. Lett. 108, 116801] Published Mon Mar 12, 2012

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Supercurrent through Grain Boundaries of Cuprate Superconductors in the Presence of Strong Correlations (2012)

F. A. Wolf, S. Graser, F. Loder, and T. Kopp

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-13

Beschreibung: Author(s): F. A. Wolf, S. Graser, F. Loder, and T. Kopp Strong correlations are known to severely reduce the mobility of charge carriers near half filling and thus have an important influence on the current carrying properties of grain boundaries in the high- T c cuprates. In this Letter we present an extension of the Gutzwiller projection approach to trea... [Phys. Rev. Lett. 108, 117002] Published Mon Mar 12, 2012

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How to Distinguish between Specular and Retroconfigurations for Andreev Reflection in Graphene Rings (2012)

Jörg Schelter, Björn Trauzettel, and Patrik Recher

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-10

Beschreibung: Author(s): Jörg Schelter, Björn Trauzettel, and Patrik Recher We numerically investigate Andreev reflection in a graphene ring with one normal conducting and one superconducting lead by solving the Bogoliubov–de Gennes equation within the Landauer-Büttiker formalism. By tuning chemical potential and bias voltage, it is possible to switch between regimes where ... [Phys. Rev. Lett. 108, 106603] Published Fri Mar 09, 2012

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Magnetization Reversal of Individual Co Nanoislands (2012)

S. Ouazi, S. Wedekind, G. Rodary, H. Oka, D. Sander, and J. Kirschner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-10

Beschreibung: Author(s): S. Ouazi, S. Wedekind, G. Rodary, H. Oka, D. Sander, and J. Kirschner We investigate the magnetization reversal of individual Co islands on Cu(111) in the size range of N =700 to 18 000 atoms by spin-polarized scanning tunneling microscopy at 8 K. The switching field H sw changes with island size in a nonmonotonic manner: it increases with island size and reaches a maxi... [Phys. Rev. Lett. 108, 107206] Published Fri Mar 09, 2012

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Broadly Tunable Subterahertz Emission from Internal Branches of the Current-Voltage Characteristics of Superconducting Bi_{2}Sr_{2}CaCu_{2}O_{8+δ} Single Crystals (2012)

Manabu Tsujimoto, Takashi Yamamoto, Kaveh Delfanazari, Ryo Nakayama, Takeo Kitamura, Masashi Sawamura, Takanari Kashiwagi, Hidetoshi Minami, Masashi Tachiki, Kazuo Kadowaki, and Richard A. Klemm

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-10

Beschreibung: Author(s): Manabu Tsujimoto, Takashi Yamamoto, Kaveh Delfanazari, Ryo Nakayama, Takeo Kitamura, Masashi Sawamura, Takanari Kashiwagi, Hidetoshi Minami, Masashi Tachiki, Kazuo Kadowaki, and Richard A. Klemm Continuous, coherent subterahertz radiation arises when a dc voltage is applied across a stack of the many intrinsic Josephson junctions in a Bi 2 Sr 2 CaCu 2 O 8+δ single crystal. The active junctions produce an equal number of I - V characteristic branches. Each branch radiates at a slightly tunable freque... [Phys. Rev. Lett. 108, 107006] Published Fri Mar 09, 2012

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Subband Structure of a Two-Dimensional Electron Gas Formed at the Polar Surface of the Strong Spin-Orbit Perovskite KTaO_{3} (2012)

P. D. C. King, R. H. He, T. Eknapakul, P. Buaphet, S.-K. Mo, Y. Kaneko, S. Harashima, Y. Hikita, M. S. Bahramy, C. Bell, Z. Hussain, Y. Tokura, Z.-X. Shen, H. Y. Hwang, F. Baumberger, and W. Meevasana

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-03-15

Beschreibung: Author(s): P. D. C. King, R. H. He, T. Eknapakul, P. Buaphet, S.-K. Mo, Y. Kaneko, S. Harashima, Y. Hikita, M. S. Bahramy, C. Bell, Z. Hussain, Y. Tokura, Z.-X. Shen, H. Y. Hwang, F. Baumberger, and W. Meevasana We demonstrate the formation of a two-dimensional electron gas (2DEG) at the (100) surface of the 5 d transition-metal oxide KTaO 3 . From angle-resolved photoemission, we find that quantum confinement lifts the orbital degeneracy of the bulk band structure and leads to a 2DEG composed of ladders of su... [Phys. Rev. Lett. 108, 117602] Published Wed Mar 14, 2012

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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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Publikationsdatum: 2012-03-15

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

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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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Publikationsdatum: 2012-03-15

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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Publikationsdatum: 2012-03-15

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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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

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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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Publikationsdatum: 2012-02-05

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

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Ground State of the Parallel Double Quantum Dot System (2012)

Rok Žitko, Jernej Mravlje, and Kristjan Haule

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Rok Žitko, Jernej Mravlje, and Kristjan Haule We resolve the controversy regarding the ground state of the parallel double quantum dot system near half filling. The numerical renormalization group predicts an underscreened Kondo state with residual spin- 1/2 magnetic moment, ln⁡2 residual impurity entropy, and unitary conductance, while the Beth... [Phys. Rev. Lett. 108, 066602] Published Wed Feb 08, 2012

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Electric Field Confinement Effect on Charge Transport in Organic Field-Effect Transistors (2012)

Xiaoran Li, Andrey Kadashchuk, Ivan I. Fishchuk, Wiljan T. T. Smaal, Gerwin Gelinck, Dirk J. Broer, Jan Genoe, Paul Heremans, and Heinz Bässler

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Xiaoran Li, Andrey Kadashchuk, Ivan I. Fishchuk, Wiljan T. T. Smaal, Gerwin Gelinck, Dirk J. Broer, Jan Genoe, Paul Heremans, and Heinz Bässler While it is known that the charge-carrier mobility in organic semiconductors is only weakly dependent on the electric field at low fields, the experimental mobility in organic field-effect transistors using silylethynyl-substituted pentacene is found to be surprisingly field dependent at low source-... [Phys. Rev. Lett. 108, 066601] Published Wed Feb 08, 2012

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Quantum Order-by-Disorder Near Criticality and the Secret of Partial Order in MnSi (2012)

Frank Krüger, Una Karahasanovic, and Andrew G. Green

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Frank Krüger, Una Karahasanovic, and Andrew G. Green The vicinity of quantum phase transitions has proven fertile ground in the search for new quantum phases. We propose a physically motivated and unifying description of phase reconstruction near metallic quantum-critical points using the idea of quantum order by disorder. Certain deformations of the ... [Phys. Rev. Lett. 108, 067003] Published Wed Feb 08, 2012

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Persistence of Covalent Bonding in Liquid Silicon Probed by Inelastic X-Ray Scattering (2012)

J. T. Okada, P. H.-L. Sit, Y. Watanabe, Y. J. Wang, B. Barbiellini, T. Ishikawa, M. Itou, Y. Sakurai, A. Bansil, R. Ishikawa, M. Hamaishi, T. Masaki, P.-F. Paradis, K. Kimura, T. Ishikawa, and S. Nanao

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): J. T. Okada, P. H.-L. Sit, Y. Watanabe, Y. J. Wang, B. Barbiellini, T. Ishikawa, M. Itou, Y. Sakurai, A. Bansil, R. Ishikawa, M. Hamaishi, T. Masaki, P.-F. Paradis, K. Kimura, T. Ishikawa, and S. Nanao Metallic liquid silicon at 1787 K is investigated using x-ray Compton scattering. An excellent agreement is found between the measurements and the corresponding Car-Parrinello molecular dynamics simulations. Our results show persistence of covalent bonding in liquid silicon and provide support for t... [Phys. Rev. Lett. 108, 067402] Published Wed Feb 08, 2012

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Non-Abelian Braiding of Lattice Bosons (2012)

Eliot Kapit, Paul Ginsparg, and Erich Mueller

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Eliot Kapit, Paul Ginsparg, and Erich Mueller We report on a numerical experiment in which we use time-dependent potentials to braid non-Abelian quasiparticles. We consider lattice bosons in a uniform magnetic field within the fractional quantum Hall regime, where ν , the ratio of particles to flux quanta, is near 1/2 , 1, or 3/2 . We introduce ti... [Phys. Rev. Lett. 108, 066802] Published Wed Feb 08, 2012

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Avoidance of Majorana Resonances in Periodic Topological Superconductor-Nanowire Structures (2012)

Jay D. Sau, Chien Hung Lin, Hoi-Yin Hui, and S. Das Sarma

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Jay D. Sau, Chien Hung Lin, Hoi-Yin Hui, and S. Das Sarma Semiconducting nanowires in proximity to superconductors are promising experimental systems for Majorana fermions which may ultimately be used as building blocks for topological quantum computers. A serious challenge in the experimental realization of the Majorana fermion in these semiconductor-supe... [Phys. Rev. Lett. 108, 067001] Published Wed Feb 08, 2012

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Manifestly Non-Gaussian Fluctuations in Superconductor-Normal Metal Tunnel Nanostructures (2012)

M. A. Laakso, T. T. Heikkilä, and Yuli V. Nazarov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): M. A. Laakso, T. T. Heikkilä, and Yuli V. Nazarov We propose a mesoscopic setup which exhibits strong and manifestly non-Gaussian fluctuations of energy and temperature when suitably driven out of equilibrium. The setup consists of a normal metal island (N) coupled by tunnel junctions (I) to two superconducting leads (S), forming a SINIS structure,... [Phys. Rev. Lett. 108, 067002] Published Wed Feb 08, 2012

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Variational Numerical Renormalization Group: Bridging the Gap between NRG and Density Matrix Renormalization Group (2012)

Iztok Pižorn and Frank Verstraete

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-09

Beschreibung: Author(s): Iztok Pižorn and Frank Verstraete The numerical renormalization group (NRG) is rephrased as a variational method with the cost function given by the sum of all the energies of the effective low-energy Hamiltonian. This allows us to systematically improve the spectrum obtained by NRG through sweeping. The ensuing algorithm has a lot ... [Phys. Rev. Lett. 108, 067202] Published Wed Feb 08, 2012

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Non-Kondo Mechanism for Resistivity Minimum in Spin Ice Conduction Systems (2012)

Masafumi Udagawa, Hiroaki Ishizuka, and Yukitoshi Motome

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): Masafumi Udagawa, Hiroaki Ishizuka, and Yukitoshi Motome We present a mechanism of resistivity minimum in conduction electron systems coupled with localized moments, which is distinguished from the Kondo effect. Instead of the spin-flip process in the Kondo effect, electrons are elastically scattered by local spin correlations which evolve in a particular... [Phys. Rev. Lett. 108, 066406] Published Fri Feb 10, 2012

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Single-Ion Kondo Scaling of the Coherent Fermi Liquid Regime in Ce_{1-x}La_{x}Ni_{2}Ge_{2} (2012)

Adam P. Pikul, Ulrike Stockert, Alexander Steppke, Tomasz Cichorek, Stefanie Hartmann, Nubia Caroca-Canales, Niels Oeschler, Manuel Brando, Christoph Geibel, and Frank Steglich

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): Adam P. Pikul, Ulrike Stockert, Alexander Steppke, Tomasz Cichorek, Stefanie Hartmann, Nubia Caroca-Canales, Niels Oeschler, Manuel Brando, Christoph Geibel, and Frank Steglich Thermodynamic and transport properties of the La-diluted Kondo lattice CeNi 2 Ge 2 were studied in a wide temperature range. The Ce-rich alloys Ce 1-x La x Ni 2 Ge 2 were found to exhibit distinct features of the coherent heavy Fermi liquid. At intermediate compositions ( 0.7≤ x ≤0.9 ), non-Fermi liquid propertie... [Phys. Rev. Lett. 108, 066405] Published Fri Feb 10, 2012

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Fermi-Level Tuning of Epitaxial Sb_{2}Te_{3} Thin Films on Graphene by Regulating Intrinsic Defects and Substrate Transfer Doping (2012)

Yeping Jiang, Y. Y. Sun, Mu Chen, Yilin Wang, Zhi Li, Canli Song, Ke He, Lili Wang, Xi Chen, Qi-Kun Xue, Xucun Ma, and S. B. Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): Yeping Jiang, Y. Y. Sun, Mu Chen, Yilin Wang, Zhi Li, Canli Song, Ke He, Lili Wang, Xi Chen, Qi-Kun Xue, Xucun Ma, and S. B. Zhang High-quality Sb 2 Te 3 films are obtained by molecular beam epitaxy on a graphene substrate and investigated by in situ scanning tunneling microscopy and spectroscopy. Intrinsic defects responsible for the natural p -type conductivity of Sb 2 Te 3 are identified to be the Sb vacancies and Sb Te antisites in... [Phys. Rev. Lett. 108, 066809] Published Fri Feb 10, 2012

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Coherent Manipulation of Electron Spins in the {Cu_{3}} Spin Triangle Complex Impregnated in Nanoporous Silicon (2012)

K.-Y. Choi, Z. Wang, H. Nojiri, J. van Tol, P. Kumar, P. Lemmens, B. S. Bassil, U. Kortz, and N. S. Dalal

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): K.-Y. Choi, Z. Wang, H. Nojiri, J. van Tol, P. Kumar, P. Lemmens, B. S. Bassil, U. Kortz, and N. S. Dalal We report on coherent manipulation of electron spins in an antiferromagnetically coupled spin triangle {Cu 3 -X} ( X=As , Sb) impregnated in freestanding nanoporous silicon (NS) by using 240 GHz microwave pulses. Rabi oscillations are observed and the spin coherence time is found to be T 2 =1066 ns at 1.... [Phys. Rev. Lett. 108, 067206] Published Fri Feb 10, 2012

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Superconducting Pairs with Extreme Uniaxial Anisotropy in URu_{2}Si_{2} (2012)

M. M. Altarawneh, N. Harrison, G. Li, L. Balicas, P. H. Tobash, F. Ronning, and E. D. Bauer

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-11

Beschreibung: Author(s): M. M. Altarawneh, N. Harrison, G. Li, L. Balicas, P. H. Tobash, F. Ronning, and E. D. Bauer We report magnetic field orientation-dependent measurements of the superconducting upper critical field in high quality single crystals of URu 2 Si 2 and find the effective g factor estimated from the Pauli limit to agree remarkably well with that found in quantum oscillation experiments, both quantita... [Phys. Rev. Lett. 108, 066407] Published Fri Feb 10, 2012

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Spectroscopy of Single Donors at ZnO(0001) Surfaces (2012)

Hao Zheng, Jörg Kröger, and Richard Berndt

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-14

Beschreibung: Author(s): Hao Zheng, Jörg Kröger, and Richard Berndt Donors near the polar (0001) surface of nominally undoped ZnO were investigated with scanning tunneling microscopy at 5 K. Spatially resolved spectroscopy reveals single and double charging. Equidistant peaks in spectra of ionized donors are attributed to polaron excitation. The data are consistent ... [Phys. Rev. Lett. 108, 076801] Published Mon Feb 13, 2012

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Microscopic Evidence for the Modification of the Electronic Structure at Grain Boundaries of Cu(In_{1-x},Ga_{x})Se_{2} Films (2012)

Doron Azulay, Isaac Balberg, and Oded Millo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): Doron Azulay, Isaac Balberg, and Oded Millo We investigated the electronic properties around grain boundaries of polycrystalline Cu(In 1-x ,Ga x Se 2 ) films as a function of Ga content, using scanning tunneling spectroscopy. Spectra acquired on samples with low Ga content ( x =0 and 0.33) reveal downward band bending with respect to adjacent p -type ... [Phys. Rev. Lett. 108, 076603] Published Tue Feb 14, 2012

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Textured Superconducting Phase in the Heavy Fermion CeRhIn_{5} (2012)

Tuson Park, H. Lee, I. Martin, X. Lu, V. A. Sidorov, K. Gofryk, F. Ronning, E. D. Bauer, and J. D. Thompson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): Tuson Park, H. Lee, I. Martin, X. Lu, V. A. Sidorov, K. Gofryk, F. Ronning, E. D. Bauer, and J. D. Thompson When antiferromagnetism and unconventional superconductivity coexist in CeRhIn 5 there is a significant temperature difference between resistively and thermodynamically determined transitions into the superconducting state. In this state, anisotropic transport near the superconducting transition reve... [Phys. Rev. Lett. 108, 077003] Published Tue Feb 14, 2012

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Spin-Orbit Sum Rule for Electric Multipole Transitions in Nonresonant Inelastic X-Ray Scattering (2012)

G. van der Laan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): G. van der Laan The sum rule for the branching ratio of dipole-excited core-valence transitions in isotropic x-ray absorption spectroscopy is extended to electric multipole transitions. The derived sum rule not only shows that the branching ratio is linearly related to the expectation value of the angular part of t... [Phys. Rev. Lett. 108, 077401] Published Tue Feb 14, 2012

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Conduction of Topologically Protected Charged Ferroelectric Domain Walls (2012)

Weida Wu, Y. Horibe, N. Lee, S.-W. Cheong, and J. R. Guest

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): Weida Wu, Y. Horibe, N. Lee, S.-W. Cheong, and J. R. Guest We report on the observation of nanoscale conduction at ferroelectric domain walls in hexagonal HoMnO 3 protected by the topology of multiferroic vortices using in situ conductive atomic force microscopy, piezoresponse force microscopy, and Kelvin-probe force microscopy at low temperatures. In additi... [Phys. Rev. Lett. 108, 077203] Published Tue Feb 14, 2012

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Spin Wave Measurements over the Full Brillouin Zone of Multiferroic BiFeO_{3} (2012)

Jaehong Jeong, E. A. Goremychkin, T. Guidi, K. Nakajima, Gun Sang Jeon, Shin-Ae Kim, S. Furukawa, Yong Baek Kim, Seongsu Lee, V. Kiryukhin, S-W. Cheong, and Je-Geun Park

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-15

Beschreibung: Author(s): Jaehong Jeong, E. A. Goremychkin, T. Guidi, K. Nakajima, Gun Sang Jeon, Shin-Ae Kim, S. Furukawa, Yong Baek Kim, Seongsu Lee, V. Kiryukhin, S-W. Cheong, and Je-Geun Park Using the inelastic neutron scattering technique, we measured the spin wave dispersion over the entire Brillouin zone of room temperature multiferroic BiFeO 3 single crystals with magnetic excitations extending to as high as 72.5 meV. The full spin waves can be explained by a simple Heisenberg Hamilt... [Phys. Rev. Lett. 108, 077202] Published Tue Feb 14, 2012

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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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Publikationsdatum: 2012-02-16

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

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Mott Transition in the Two-Dimensional Hubbard Model (2012)

Masanori Kohno

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): Masanori Kohno Spectral properties of the two-dimensional Hubbard model near the Mott transition are investigated by using cluster perturbation theory. The Mott transition is characterized by freezing of the charge degrees of freedom in a single-particle excitation that leads continuously to the magnetic excitatio... [Phys. Rev. Lett. 108, 076401] Published Wed Feb 15, 2012

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Photoexcitation Dynamics in Films of C_{60} and Zn Phthalocyanine with a Layered Nanostructure (2012)

Paul A. Lane, Paul D. Cunningham, Joseph S. Melinger, Gary P. Kushto, Okan Esenturk, and Edwin J. Heilweil

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): Paul A. Lane, Paul D. Cunningham, Joseph S. Melinger, Gary P. Kushto, Okan Esenturk, and Edwin J. Heilweil We elucidate photoexcitation dynamics in C 60 and zinc phthalocyanine (ZnPc) from picoseconds to milliseconds by transient absorption and time-resolved terahertz spectroscopy. Autoionization of C 60 is a precursor to photocarrier generation. Decay of the terahertz signal is due to decreasing photocarr... [Phys. Rev. Lett. 108, 077402] Published Wed Feb 15, 2012

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Size Dependence of Exchange Bias in Co/CoO Nanostructures (2012)

Sara Laureti, Sarah Y. Suck, Helge Haas, Eric Prestat, Olivier Bourgeois, and Dominique Givord

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): Sara Laureti, Sarah Y. Suck, Helge Haas, Eric Prestat, Olivier Bourgeois, and Dominique Givord In Co/CoO nanostructures, of dimensions l ×3 l , at small Co thickness ( ≈6,10 nm ), a strong increase in the bias field and the associated coercive field are found as the nanostructure size is reduced from l =120 nm to l =30 nm . This property indicates that the characteristic length D AF within the anti... [Phys. Rev. Lett. 108, 077205] Published Wed Feb 15, 2012

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Coupling of Magnetic and Ferroelectric Hysteresis by a Multicomponent Magnetic Structure in Mn_{2}GeO_{4} (2012)

J. S. White, T. Honda, K. Kimura, T. Kimura, Ch. Niedermayer, O. Zaharko, A. Poole, B. Roessli, and M. Kenzelmann

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-16

Beschreibung: Author(s): J. S. White, T. Honda, K. Kimura, T. Kimura, Ch. Niedermayer, O. Zaharko, A. Poole, B. Roessli, and M. Kenzelmann The olivine compound Mn 2 GeO 4 is shown to feature both a ferroelectric polarization and a ferromagnetic magnetization that are directly coupled and point along the same direction. We show that a spin spiral generates ferroelectricity, and a canted commensurate order leads to weak ferromagnetism. Symm... [Phys. Rev. Lett. 108, 077204] Published Wed Feb 15, 2012

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Intrinsic Optical Dichroism in the Chiral Superconducting State of Sr_{2}RuO_{4} (2012)

K. I. Wysokiński, James F. Annett, and B. L. Györffy

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-17

Beschreibung: Author(s): K. I. Wysokiński, James F. Annett, and B. L. Györffy We present an analysis of the Hall conductivity σ x y ( ω , T ) in time reversal symmetry breaking states of exotic superconductors. We find that the dichroic signal is nonzero in systems with interband order parameters. This new intrinsic mechanism may explain the Kerr effect observed in strontium ruthena... [Phys. Rev. Lett. 108, 077004] Published Thu Feb 16, 2012

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Observation of Complex Bound States in the Spin-1/2 Heisenberg XXZ Chain Using Local Quantum Quenches (2012)

Martin Ganahl, Elias Rabel, Fabian H. L. Essler, and H. G. Evertz

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-18

Beschreibung: Author(s): Martin Ganahl, Elias Rabel, Fabian H. L. Essler, and H. G. Evertz We consider the nonequilibrium evolution in the spin- 1/2 X X Z Heisenberg chain for fixed magnetization after a local quantum quench. This model is equivalent to interacting spinless fermions. Initially an infinite magnetic field is applied to n consecutive sites and the ground state is calculated. At... [Phys. Rev. Lett. 108, 077206] Published Fri Feb 17, 2012

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Dimensionality Selection in a Molecule-Based Magnet (2012)

Paul A. Goddard, Jamie L. Manson, John Singleton, Isabel Franke, Tom Lancaster, Andrew J. Steele, Stephen J. Blundell, Christopher Baines, Francis L. Pratt, Ross D. McDonald, Oscar E. Ayala-Valenzuela, Jordan F. Corbey, Heather I. Southerland, Pinaki Sengupta, and John A. Schlueter

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-18

Beschreibung: Author(s): Paul A. Goddard, Jamie L. Manson, John Singleton, Isabel Franke, Tom Lancaster, Andrew J. Steele, Stephen J. Blundell, Christopher Baines, Francis L. Pratt, Ross D. McDonald, Oscar E. Ayala-Valenzuela, Jordan F. Corbey, Heather I. Southerland, Pinaki Sengupta, and John A. Schlueter Gaining control of the building blocks of magnetic materials and thereby achieving particular characteristics will make possible the design and growth of bespoke magnetic devices. While progress in the synthesis of molecular materials, and especially coordination polymers, represents a significant s... [Phys. Rev. Lett. 108, 077208] Published Fri Feb 17, 2012

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Signature of a Fano Resonance in a Plasmonic Metamolecule’s Local Density of Optical States (2012)

Martin Frimmer, Toon Coenen, and A. Femius Koenderink

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-02-18

Beschreibung: Author(s): Martin Frimmer, Toon Coenen, and A. Femius Koenderink We present measurements on plasmonic metamolecules under local excitation using cathodoluminescence which show a spatial redistribution of the local density of optical states at the same frequency where a sharp spectral Fano feature in extinction has been observed. Our analytical model shows that bo... [Phys. Rev. Lett. 108, 077404] Published Fri Feb 17, 2012

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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

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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

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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

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Cooperative dynamics in charge-ordered state of α-(BEDT-TTF)_{2}I_{3} (2012)

T. Ivek, I. Kovačević, M. Pinterić, B. Korin-Hamzić, S. Tomić, T. Knoblauch, D. Schweitzer, and M. Dressel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-22

Beschreibung: Author(s): T. Ivek, I. Kovačević, M. Pinterić, B. Korin-Hamzić, S. Tomić, T. Knoblauch, D. Schweitzer, and M. Dressel Electric-field-dependent pulse measurements are reported in the charge-ordered state of α -(BEDT-TTF) 2 I 3 . At low electric fields up to about 50 V/cm only negligible deviations from Ohmic behavior can be identified with no threshold field. At larger electric fields and up to about 100 V/cm a reproduci... [Phys. Rev. B 86, 245125] Published Fri Dec 21, 2012

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Fermi Nesting between Atomic Wires with Strong Spin-Orbit Coupling (2012)

C. Tegenkamp, D. Lükermann, H. Pfnür, B. Slomski, G. Landolt, and J. H. Dil

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): C. Tegenkamp, D. Lükermann, H. Pfnür, B. Slomski, G. Landolt, and J. H. Dil The mutual interplay between superlattice structures, band filling factors, and spin-orbit coupling results in a highly correlated electronic spin and charge state found for an array of atomic Pb wires grown on Si(557). By means of spin- and angle-resolved photoemission spectroscopy, the spin textur... [Phys. Rev. Lett. 109, 266401] Published Wed Dec 26, 2012

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Tailoring Magnetic Doping in the Topological Insulator Bi_{2}Se_{3} (2012)

Jian-Min Zhang, Wenguang Zhu, Ying Zhang, Di Xiao, and Yugui Yao

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): Jian-Min Zhang, Wenguang Zhu, Ying Zhang, Di Xiao, and Yugui Yao We theoretically investigate the possibility of establishing ferromagnetism in the topological insulator Bi 2 Se 3 via magnetic doping of 3 d transition metal elements. The formation energies, charge states, band structures, and magnetic properties of doped Bi 2 Se 3 are studied using first-principles calc... [Phys. Rev. Lett. 109, 266405] Published Wed Dec 26, 2012

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Topological Flat Bands from Dipolar Spin Systems (2012)

N. Y. Yao, C. R. Laumann, A. V. Gorshkov, S. D. Bennett, E. Demler, P. Zoller, and M. D. Lukin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-27

Beschreibung: Author(s): N. Y. Yao, C. R. Laumann, A. V. Gorshkov, S. D. Bennett, E. Demler, P. Zoller, and M. D. Lukin We propose and analyze a physical system that naturally admits two-dimensional topological nearly flat bands. Our approach utilizes an array of three-level dipoles (effective S =1 spins) driven by inhomogeneous electromagnetic fields. The dipolar interactions produce arbitrary uniform background gaug... [Phys. Rev. Lett. 109, 266804] Published Wed Dec 26, 2012

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Optical dielectric function of gold (2012)

Robert L. Olmon, Brian Slovick, Timothy W. Johnson, David Shelton, Sang-Hyun Oh, Glenn D. Boreman, and Markus B. Raschke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): Robert L. Olmon, Brian Slovick, Timothy W. Johnson, David Shelton, Sang-Hyun Oh, Glenn D. Boreman, and Markus B. Raschke In metal optics gold assumes a special status because of its practical importance in optoelectronic and nano-optical devices, and its role as a model system for the study of the elementary electronic excitations that underlie the interaction of electromagnetic fields with metals. However, largely in... [Phys. Rev. B 86, 235147] Published Fri Dec 28, 2012

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Transformation-optics insight into nonlocal effects in separated nanowires (2012)

A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): A. I. Fernández-Domínguez, P. Zhang, Y. Luo, S. A. Maier, F. J. García-Vidal, and J. B. Pendry We present a transformation-optics approach which sheds analytical insight into the impact that spatial dispersion has on the optical response of separated dimers of metallic nanowires. We show that nonlocal effects are apparent at interparticle distances one order of magnitude larger than the longi... [Phys. Rev. B 86, 241110] Published Fri Dec 28, 2012

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Topological flat band models with arbitrary Chern numbers (2012)

Shuo Yang, Zheng-Cheng Gu, Kai Sun, and S. Das Sarma

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): Shuo Yang, Zheng-Cheng Gu, Kai Sun, and S. Das Sarma We report the theoretical discovery of a systematic scheme to produce topological flat bands (TFBs) with arbitrary Chern numbers. We find that generically a multiorbital high Chern number TFB model can be constructed by considering multilayer Chern number C =1 TFB models with enhanced translational s... [Phys. Rev. B 86, 241112] Published Fri Dec 28, 2012

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Ferromagnetism and antiferromagnetism of a correlated topological insulator with a flat band (2012)

Jing He, Bo Wang, and Su-Peng Kou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): Jing He, Bo Wang, and Su-Peng Kou In this paper, based on the mean-field approach and random-phase approximation, we studied the magnetic properties of the spinfull Haldane model on honeycomb lattice of topological flat band with onsite repulsive Coulomb interaction. We found that the antiferromagnetic (AF) order is more stable than... [Phys. Rev. B 86, 235146] Published Fri Dec 28, 2012

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Electrical Suppression of Spin Relaxation in GaAs(111)B Quantum Wells (2012)

A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): A. Hernández-Mínguez, K. Biermann, R. Hey, and P. V. Santos Spin dephasing via the spin-orbit interaction (SOI) is a major mechanism limiting the electron spin lifetime in III-V zincblende quantum wells (QWs). The dephasing can be suppressed in GaAs(111) quantum wells by applying an electric field. The suppression has been attributed to the compensation of t... [Phys. Rev. Lett. 109, 266602] Published Fri Dec 28, 2012

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Zero-Bias Peaks in the Tunneling Conductance of Spin-Orbit-Coupled Superconducting Wires with and without Majorana End-States (2012)

Jie Liu, Andrew C. Potter, K. T. Law, and Patrick A. Lee

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): Jie Liu, Andrew C. Potter, K. T. Law, and Patrick A. Lee One of the simplest proposed experimental probes of a Majorana bound state is a quantized (2 e 2 / h ) value of zero-bias tunneling conductance. When temperature is somewhat larger than the intrinsic width of the Majorana peak, conductance is no longer quantized, but a zero-bias peak can remain. Such a n... [Phys. Rev. Lett. 109, 267002] Published Fri Dec 28, 2012

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Combined Theoretical and Experimental Study of Spin and Charge Dynamics on the Homodinuclear Complex [Ni_{2}^{II}(L-N_{4}Me_{2})(emb)] (2012)

W. Jin, F. Rupp, K. Chevalier, M. M. N. Wolf, M. Colindres Rojas, G. Lefkidis, H.-J. Krüger, R. Diller, and W. Hübner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-29

Beschreibung: Author(s): W. Jin, F. Rupp, K. Chevalier, M. M. N. Wolf, M. Colindres Rojas, G. Lefkidis, H.-J. Krüger, R. Diller, and W. Hübner We present a combined theoretical and experimental study of spin and charge dynamics on the homodinuclear compound [Ni 2 II (L-N 4 Me 2 )(emb)]. The theoretically calculated oscillator strengths of the ground-state absorption spectrum show an acceptable agreement with experiment. We predict a local ultrafa... [Phys. Rev. Lett. 109, 267209] Published Fri Dec 28, 2012

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Transport, thermal, and magnetic properties of the narrow-gap semiconductor CrSb_{2} (2012)

Brian C. Sales, Andrew F. May, Michael A. McGuire, Matthew B. Stone, David J. Singh, and David Mandrus

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-21

Beschreibung: Author(s): Brian C. Sales, Andrew F. May, Michael A. McGuire, Matthew B. Stone, David J. Singh, and David Mandrus Resistivity, the Hall effect, the Seebeck coefficient, thermal conductivity, heat capacity, and magnetic susceptibility data are reported for CrSb 2 single crystals. In spite of some unusual features in electrical transport and Hall measurements below 100 K, only one phase transition is found in the ... [Phys. Rev. B 86, 235136] Published Thu Dec 20, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Tensor networks and the numerical renormalization group (2012)

Andreas Weichselbaum

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-21

Beschreibung: Author(s): Andreas Weichselbaum The full-density-matrix numerical renormalization group has evolved as a systematic and transparent setting for the calculation of thermodynamical quantities at arbitrary temperatures within the numerical renormalization group (NRG) framework. It directly evaluates the relevant Lehmann representatio... [Phys. Rev. B 86, 245124] Published Thu Dec 20, 2012

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Models of three-dimensional fractional topological insulators (2012)

Joseph Maciejko, Xiao-Liang Qi, Andreas Karch, and Shou-Cheng Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): Joseph Maciejko, Xiao-Liang Qi, Andreas Karch, and Shou-Cheng Zhang Time-reversal invariant three-dimensional topological insulators can be defined fundamentally by a topological field theory with a quantized axion angle θ of 0 or π . It was recently shown that fractional quantized values of θ are consistent with time-reversal invariance if deconfined, gapped, fracti... [Phys. Rev. B 86, 235128] Published Wed Dec 19, 2012

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Magnetic orders and topological phases from f-d exchange in pyrochlore iridates (2012)

Gang Chen and Michael Hermele

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): Gang Chen and Michael Hermele We study theoretically the effects of f - d magnetic exchange interaction in the R 2 Ir 2 O 7 pyrochlore iridates. The R 3+ f electrons form localized Kramers or non-Kramers doublets, while the Ir 4+ d electrons are more itinerant and feel a strong spin-orbit coupling. We construct and analyze a minimal model... [Phys. Rev. B 86, 235129] Published Wed Dec 19, 2012

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Magnetic domain wall propagation under ferroelectric control (2012)

E. Mikheev, I. Stolichnov, E. De Ranieri, J. Wunderlich, H. J. Trodahl, A. W. Rushforth, S. W. E. Riester, R. P. Campion, K. W. Edmonds, B. L. Gallagher, and N. Setter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): E. Mikheev, I. Stolichnov, E. De Ranieri, J. Wunderlich, H. J. Trodahl, A. W. Rushforth, S. W. E. Riester, R. P. Campion, K. W. Edmonds, B. L. Gallagher, and N. Setter Control of magnetic domain walls (DWs) and their propagation is among the most promising development directions for future information-storage devices. The well-established tools for such manipulation are the spin-torque transfer from electrical currents and strain. The focus of this paper is an alt... [Phys. Rev. B 86, 235130] Published Wed Dec 19, 2012

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Route towards cylindrical cloaking at visible frequencies using an optimization algorithm (2012)

Andreas Rottler, Benjamin Krüger, Detlef Heitmann, Daniela Pfannkuche, and Stefan Mendach

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): Andreas Rottler, Benjamin Krüger, Detlef Heitmann, Daniela Pfannkuche, and Stefan Mendach We derive a model based on the Maxwell-Garnett effective-medium theory that describes a cylindrical cloaking shell composed of metal rods which are radially aligned in a dielectric host medium. We propose and demonstrate a minimization algorithm that calculates for given material parameters the opti... [Phys. Rev. B 86, 245120] Published Wed Dec 19, 2012

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Electronic transitions in CePd_{2}Si_{2} studied by resonant x-ray emission spectroscopy at high pressures and low temperatures (2012)

Hitoshi Yamaoka, Yumiko Zekko, Akio Kotani, Ignace Jarrige, Naohito Tsujii, Jung-Fu Lin, Jun'ichiro Mizuki, Hideki Abe, Hideaki Kitazawa, Nozomu Hiraoka, Hirofumi Ishii, and Ku-Ding Tsuei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): Hitoshi Yamaoka, Yumiko Zekko, Akio Kotani, Ignace Jarrige, Naohito Tsujii, Jung-Fu Lin, Jun'ichiro Mizuki, Hideki Abe, Hideaki Kitazawa, Nozomu Hiraoka, Hirofumi Ishii, and Ku-Ding Tsuei Temperature and pressure dependences of the electronic structure of the heavy-fermion system CePd 2 Si 2 have been investigated using partial fluorescence yield x-ray absorption spectroscopy and resonant x-ray emission spectroscopy at the Ce L 3 edge. The temperature dependence has also been measured fo... [Phys. Rev. B 86, 235131] Published Wed Dec 19, 2012

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Analysis of two-photon photoemission from Si(001) (2012)

H. Husser and E. Pehlke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-20

Beschreibung: Author(s): H. Husser and E. Pehlke We have applied our ab initio simulation approach for the photoemission process at solid surfaces to calculate two-photon photoemission spectra from the p (2×2)-reconstructed Si(001) surface. In this approach, the ground-state electronic structure of the surface is obtained within density functional ... [Phys. Rev. B 86, 235134] Published Wed Dec 19, 2012

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Spin-polarized density-matrix functional theory of the single-impurity Anderson model (2012)

W. Töws and G. M. Pastor

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-21

Beschreibung: Author(s): W. Töws and G. M. Pastor Lattice density functional theory (LDFT) is used to investigate spin excitations in the single-impurity Anderson model. In this method, the single-particle density matrix γ i j σ with respect to the lattice sites replaces the wave function as the basic variable of the many-body problem. A recently deve... [Phys. Rev. B 86, 245123] Published Thu Dec 20, 2012

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Nature of Weak Magnetism in SrTiO_{3}/LaAlO_{3} Multilayers (2012)

Z. Salman, O. Ofer, M. Radovic, H. Hao, M. Ben Shalom, K. H. Chow, Y. Dagan, M. D. Hossain, C. D. P. Levy, W. A. Mac; Farlane, G. M. Morris, L. Patthey, M. R. Pearson, H. Saadaoui, T. Schmitt, D. Wang, and R. F. Kiefl

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-12-21

Beschreibung: Author(s): Z. Salman, O. Ofer, M. Radovic, H. Hao, M. Ben Shalom, K. H. Chow, Y. Dagan, M. D. Hossain, C. D. P. Levy, W. A. MacFarlane, G. M. Morris, L. Patthey, M. R. Pearson, H. Saadaoui, T. Schmitt, D. Wang, and R. F. Kiefl We report the observation of weak magnetism in superlattices of LaAlO 3 /SrTiO 3 using β -detected nuclear magnetic resonance. The spin lattice relaxation rate of 8 Li in superlattices with a spacer layers of 8 and 6 unit cells of LaAlO 3 exhibits a strong peak near ∼35 K, whereas no such peak is observe... [Phys. Rev. Lett. 109, 257207] Published Thu Dec 20, 2012

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Nonthermal symmetry-broken states in the strongly interacting Hubbard model (2012)

Philipp Werner, Naoto Tsuji, and Martin Eckstein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-03

Beschreibung: Author(s): Philipp Werner, Naoto Tsuji, and Martin Eckstein We study the time evolution of the antiferromagnetic order parameter after interaction quenches in the Hubbard model. Using the nonequilibrium dynamical mean-field formalism, we show that the system, after a quench from intermediate to strong interaction, is trapped in a nonthermal state which is re... [Phys. Rev. B 86, 205101] Published Thu Nov 01, 2012

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Direct Observation of Valley Hybridization and Universal Symmetry of Graphene with Mesoscopic Conductance Fluctuations (2012)

Atindra Nath Pal, Vidya Kochat, and Arindam Ghosh

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): Atindra Nath Pal, Vidya Kochat, and Arindam Ghosh In graphene, the valleys represent spinlike quantities and can act as a physical resource in valley-based electronics to produce novel quantum computation schemes. Here we demonstrate a direct route to tune and read the valley quantum states of disordered graphene by measuring the mesoscopic conduct... [Phys. Rev. Lett. 109, 196601] Published Wed Nov 07, 2012

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Microscopic Coexistence of Superconductivity and Antiferromagnetism in Underdoped Ba(Fe_{1-x}Ru_{x})_{2}As_{2} (2012)

Long Ma, G. F. Ji, Jia Dai, X. R. Lu, M. J. Eom, J. S. Kim, B. Normand, and Weiqiang Yu

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): Long Ma, G. F. Ji, Jia Dai, X. R. Lu, M. J. Eom, J. S. Kim, B. Normand, and Weiqiang Yu We use 75 As nuclear magnetic resonance to investigate the local electronic properties of Ba(Fe 1- x Ru x ) 2 As 2 ( x =0.23). We find two phase transitions: to antiferromagnetism at T N ≈60 K and to superconductivity at T C ≈15 K. Below T N , our data show that the system is fully magnetic, with a commensurate an... [Phys. Rev. Lett. 109, 197002] Published Wed Nov 07, 2012

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Interfacial Ferromagnetism and Exchange Bias in CaRuO_{3}/CaMnO_{3} Superlattices (2012)

C. He, A. J. Grutter, M. Gu, N. D. Browning, Y. Takamura, B. J. Kirby, J. A. Borchers, J. W. Kim, M. R. Fitzsimmons, X. Zhai, V. V. Mehta, F. J. Wong, and Y. Suzuki

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): C. He, A. J. Grutter, M. Gu, N. D. Browning, Y. Takamura, B. J. Kirby, J. A. Borchers, J. W. Kim, M. R. Fitzsimmons, X. Zhai, V. V. Mehta, F. J. Wong, and Y. Suzuki We have found ferromagnetism in epitaxially grown superlattices of CaRuO 3 /CaMnO 3 that arises in one unit cell at the interface. Scanning transmission electron microscopy and electron energy loss spectroscopy indicate that the difference in magnitude of the Mn valence states between the center of the... [Phys. Rev. Lett. 109, 197202] Published Wed Nov 07, 2012

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Continuous magnetic phase transition in half-frustrated Ca_{2}Os_{2}O_{7} (2012)

P. Zheng, Y. G. Shi, Q. S. Wu, G. Xu, T. Dong, Z. G. Chen, R. H. Yuan, B. Cheng, K. Yamaura, J. L. Luo, and N. L. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): P. Zheng, Y. G. Shi, Q. S. Wu, G. Xu, T. Dong, Z. G. Chen, R. H. Yuan, B. Cheng, K. Yamaura, J. L. Luo, and N. L. Wang We present the specific heat, magnetization, optical spectroscopy measurements, and the first-principles calculations on the Weberite structure Ca 2 Os 2 O 7 single-crystal/polycrystalline sample. The Ca 2 Os 2 O 7 shows a Curie-Weiss nature at high temperature and goes into a ferrimagnetic insulating state a... [Phys. Rev. B 86, 195108] Published Wed Nov 07, 2012

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Kinks in the periodic Anderson model (2012)

A. Kainz, A. Toschi, R. Peters, and K. Held

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): A. Kainz, A. Toschi, R. Peters, and K. Held Recently, dynamical mean-field-theory calculations have shown that kinks emerge in the real part of the self-energy of strongly correlated metals close to the Fermi level. This gives rise to a similar behavior in the quasiparticle dispersion relation as well as in the electronic specific heat. Since... [Phys. Rev. B 86, 195110] Published Wed Nov 07, 2012

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Enhancement of edge channel transport by a low-frequency irradiation (2012)

A. D. Chepelianskii, J. Laidet, I. Farrer, H. E. Beere, D. A. Ritchie, and H. Bouchiat

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-08

Beschreibung: Author(s): A. D. Chepelianskii, J. Laidet, I. Farrer, H. E. Beere, D. A. Ritchie, and H. Bouchiat The magnetotransport properties of high-mobility two-dimensional electron gas have recently attracted a significant interest due to the discovery of microwave-induced zero-resistance states. Here we show experimentally that microwave irradiation with a photon energy much smaller than the spacing bet... [Phys. Rev. B 86, 205108] Published Wed Nov 07, 2012

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Unraveling the Intrinsic and Robust Nature of van Hove Singularities in Twisted Bilayer Graphene by Scanning Tunneling Microscopy and Theoretical Analysis (2012)

I. Brihuega, P. Mallet, H. González-Herrero, G. Trambly de Laissardière, M. M. Ugeda, L. Magaud, J. M. Gómez-Rodíguez, F. Ynduráin, and J.-Y. Veuillen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-09

Beschreibung: Author(s): I. Brihuega, P. Mallet, H. González-Herrero, G. Trambly de Laissardière, M. M. Ugeda, L. Magaud, J. M. Gómez-Rodíguez, F. Ynduráin, and J.-Y. Veuillen Extensive scanning tunneling microscopy and spectroscopy experiments complemented by first-principles and parametrized tight binding calculations provide a clear answer to the existence, origin, and robustness of van Hove singularities (vHs) in twisted graphene layers. Our results are conclusive: vH... [Phys. Rev. Lett. 109, 196802] Published Thu Nov 08, 2012

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Linear Magnetoelectric Effect by Orbital Magnetism (2012)

A. Scaramucci, E. Bousquet, M. Fechner, M. Mostovoy, and N. A. Spaldin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-09

Beschreibung: Author(s): A. Scaramucci, E. Bousquet, M. Fechner, M. Mostovoy, and N. A. Spaldin We use symmetry analysis and first-principles calculations to show that the linear magnetoelectric effect can originate from the response of orbital magnetic moments to the polar distortions induced by an applied electric field. Using LiFePO 4 as a model compound we show that spin-orbit coupling part... [Phys. Rev. Lett. 109, 197203] Published Thu Nov 08, 2012

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Role of Percolation in the Conductance of Electrolyte-Gated SrTiO_{3} (2012)

Mingyang Li, Tanja Graf, Thomas D. Schladt, Xin Jiang, and Stuart S. P. Parkin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-10

Beschreibung: Author(s): Mingyang Li, Tanja Graf, Thomas D. Schladt, Xin Jiang, and Stuart S. P. Parkin We study the electrolyte-gate-induced conductance at the surface of SrTiO 3 (001). We find two distinct transport regimes as a function of gate voltage. At high carrier densities, a percolative metallic state is induced in which, at low temperatures, clear signatures of a Kondo effect are observed. At... [Phys. Rev. Lett. 109, 196803] Published Fri Nov 09, 2012

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Spin Fluctuations of Paramagnetic Rh Clusters Revealed by X-Ray Magnetic Circular Dichroism (2012)

V. M. T. S. Barthem, A. Rogalev, F. Wilhelm, M. M. Sant’Anna, S. L. A. Mello, Y. Zhang, P. Bayle-Guillemaud, and D. Givord

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-10

Beschreibung: Author(s): V. M. T. S. Barthem, A. Rogalev, F. Wilhelm, M. M. Sant’Anna, S. L. A. Mello, Y. Zhang, P. Bayle-Guillemaud, and D. Givord The magnetic moment induced on Rh atoms, forming 1.6 nm average diameter clusters, embedded in an Al 2 O 3 matrix, has been determined using x-ray magnetic circular dichroism measurements. The magnetic moment varies linearly with the applied magnetic field. At 2.3 K and under 17 T, the spin magnetic mo... [Phys. Rev. Lett. 109, 197204] Published Fri Nov 09, 2012

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Phase diagram of the asymmetric Hubbard model and an entropic chromatographic method for cooling cold fermions in optical lattices (2012)

E. A. Winograd, R. Chitra, and M. J. Rozenberg

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): E. A. Winograd, R. Chitra, and M. J. Rozenberg We study the phase diagram of the asymmetric Hubbard model (AHM), which is characterized by different values of the hopping for the two spin projections of a fermion or, equivalently, two different orbitals. This model is expected to provide a good description of a mass-imbalanced cold fermionic mix... [Phys. Rev. B 86, 195118] Published Tue Nov 13, 2012

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From the Cooper Problem to Canted Supersolids in Bose-Fermi Mixtures (2012)

Peter Anders, Philipp Werner, Matthias Troyer, Manfred Sigrist, and Lode Pollet

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): Peter Anders, Philipp Werner, Matthias Troyer, Manfred Sigrist, and Lode Pollet We calculate the phase diagram of the Bose-Fermi Hubbard model on the 3 d cubic lattice at fermionic half filling and bosonic unit filling by means of single-site dynamical mean-field theory. For fast bosons, this is equivalent to the Cooper problem in which the bosons can induce s -wave pairing betwe... [Phys. Rev. Lett. 109, 206401] Published Tue Nov 13, 2012

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Digitale ISSN: 1079-7114

Thema: Physik

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Long-Range Spin-Polarized Quasiparticle Transport in Mesoscopic Al Superconductors with a Zeeman Splitting (2012)

F. Hübler, M. J. Wolf, D. Beckmann, and H. v. Löhneysen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): F. Hübler, M. J. Wolf, D. Beckmann, and H. v. Löhneysen We report on nonlocal transport in multiterminal superconductor-ferromagnet structures, which were fabricated by means of e -beam lithography and shadow evaporation techniques. In the presence of a significant Zeeman splitting of the quasiparticle states, we find signatures of spin transport over dis... [Phys. Rev. Lett. 109, 207001] Published Tue Nov 13, 2012

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Ultrafast Exciton Population, Relaxation, and Decay Dynamics in Thin Oligothiophene Films (2012)

E. Varene, L. Bogner, C. Bronner, and P. Tegeder

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): E. Varene, L. Bogner, C. Bronner, and P. Tegeder Femtosecond time-resolved two-photon photoemission spectroscopy is utilized to determine the electronically excited states dynamics at the α -sexithiophene (6T)/Au(111) interface and within the 6T film. We found that a photoinduced transition between the highest occupied molecular orbital and lowest ... [Phys. Rev. Lett. 109, 207601] Published Tue Nov 13, 2012

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Fast and Robust Spin Manipulation in a Quantum Dot by Electric Fields (2012)

Yue Ban, Xi Chen, E. Ya Sherman, and J. G. Muga

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-14

Beschreibung: Author(s): Yue Ban, Xi Chen, E. Ya Sherman, and J. G. Muga We apply an invariant-based inverse engineering method to control, by time-dependent electric fields, the spin dynamics in a quantum dot with spin-orbit coupling in a weak magnetic field. The designed electric fields provide a shortcut to adiabatic processes that flip the spin rapidly, thus avoiding... [Phys. Rev. Lett. 109, 206602] Published Tue Nov 13, 2012

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Density of states and magnetic correlations at a metal-Mott insulator interface (2012)

M. Jiang, G. G. Batrouni, and R. T. Scalettar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-13

Beschreibung: Author(s): M. Jiang, G. G. Batrouni, and R. T. Scalettar The possibility of novel behavior at interfaces between strongly and weakly correlated materials has come under increased study recently. In this paper, we use determinant quantum Monte Carlo to determine the interpenetration of metallic and Mott-insulator physics across an interface in the two-dime... [Phys. Rev. B 86, 195117] Published Mon Nov 12, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Atomic dynamics of low-lying rare-earth guest modes in heavy fermion filled skutterudites ROs_{4}Sb_{12} (R = light rare-earth) (2012)

Satoshi Tsutsui, Hiroshi Uchiyama, John P. Sutter, Alfred Q. R. Baron, Masaichiro Mizumaki, Naomi Kawamura, Tomoya Uruga, Hitoshi Sugawara, Jun-ichi Yamaura, Akira Ochiai, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, and Hideyuki Sato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-13

Beschreibung: Author(s): Satoshi Tsutsui, Hiroshi Uchiyama, John P. Sutter, Alfred Q. R. Baron, Masaichiro Mizumaki, Naomi Kawamura, Tomoya Uruga, Hitoshi Sugawara, Jun-ichi Yamaura, Akira Ochiai, Takumi Hasegawa, Norio Ogita, Masayuki Udagawa, and Hideyuki Sato The atomic dynamics of the guest modes in heavy fermion filled skutterudites R Os 4 Sb 12 were investigated by inelastic x-ray scattering. Comparison of the phonon dispersion relations for the filled skutterudite SmOs 4 Sb 12 with those for the unfilled skutterudite IrSb 3 indicates that the guest modes in ... [Phys. Rev. B 86, 195115] Published Mon Nov 12, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Spin injection into a metal from a topological insulator (2012)

S. Modak, K. Sengupta, and Diptiman Sen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-13

Beschreibung: Author(s): S. Modak, K. Sengupta, and Diptiman Sen We study a junction of a topological insulator with a thin two-dimensional nonmagnetic or partially polarized ferromagnetic metallic film deposited on a three-dimensional insulator. We show, by deriving generic boundary conditions applicable to electrons traversing the junction, that there is a fini... [Phys. Rev. B 86, 205114] Published Mon Nov 12, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Quasi-non-uniform gradient-level exchange-correlation approximation for metals and alloys (2012)

H. Levämäki, M. P. J. Punkkinen, K. Kokko, and L. Vitos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-13

Beschreibung: Author(s): H. Levämäki, M. P. J. Punkkinen, K. Kokko, and L. Vitos The flexibility of the common generalized gradient approximation for the exchange-correlation energy is investigated by monitoring the equilibrium volume of transition metals. It is shown that no universal gradient-level approximation yielding consistent errors for all metals exists. Based on an ele... [Phys. Rev. B 86, 201104] Published Mon Nov 12, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Coulomb blockade and Kondo effect in the electronic structure of Hubbard molecules connected to metallic leads: A finite-temperature exact-diagonalization study (2012)

H. Ishida and A. Liebsch

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-11-15

Beschreibung: Author(s): H. Ishida and A. Liebsch The electronic structure of small Hubbard molecules coupled between two noninteracting semi-infinite leads is studied in the low bias-voltage limit. To calculate the finite-temperature Green's function of the system, each lead is simulated by a small cluster, so that the problem is reduced to that o... [Phys. Rev. B 86, 205115] Published Wed Nov 14, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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Impact of Atomic Structure on the Magnon Dispersion Relation: A Comparison Between Fe(111)/Au/W(110) and Fe(110)/W(110) (2012)

T.-H. Chuang, Kh. Zakeri, A. Ernst, L. M. Sandratskii, P. Buczek, Y. Zhang, H. J. Qin, W. Adeagbo, W. Hergert, and J. Kirschner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-15

Beschreibung: Author(s): T.-H. Chuang, Kh. Zakeri, A. Ernst, L. M. Sandratskii, P. Buczek, Y. Zhang, H. J. Qin, W. Adeagbo, W. Hergert, and J. Kirschner We present a combined experimental and theoretical study of the interplay between the atomic structure and the magnon excitations in low dimensional ferromagnets. Two monolayer thick Fe films on W(110) with and without a Au buffer layer are investigated. Our experiments show that adding the Au layer... [Phys. Rev. Lett. 109, 207201] Published Wed Nov 14, 2012

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Dirac Fermions in Strongly Bound Graphene Systems (2012)

Yuanchang Li, Pengcheng Chen, Gang Zhou, Jia Li, Jian Wu, Bing-Lin Gu, S. B. Zhang, and Wenhui Duan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2012-11-15

Beschreibung: Author(s): Yuanchang Li, Pengcheng Chen, Gang Zhou, Jia Li, Jian Wu, Bing-Lin Gu, S. B. Zhang, and Wenhui Duan It is highly desirable to integrate graphene into existing semiconductor technology, where the combined system is thermodynamically stable yet maintain a Dirac cone at the Fermi level. First-principles calculations reveal that a certain transition metal (TM) intercalated graphene/SiC(0001), such as ... [Phys. Rev. Lett. 109, 206802] Published Wed Nov 14, 2012

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Light wave states in quasiperiodic metallic structures (2012)

Kang Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2012-12-11

Beschreibung: Author(s): Kang Wang We investigate the light wave states in the octagonal and decagonal quasiperiodic metallic structures by considering their respective approximants at different orders. The mechanisms underlying the light wave behaviors are studied in relation to various structure parameters and configurations. We sh... [Phys. Rev. B 86, 235110] Published Mon Dec 10, 2012

Schlagwort(e): Electronic structure and strongly correlated systems

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