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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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Publication Date: 2012-03-09

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-03-09

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Brane-f(R) gravity and dark matter (2012)

A. S. Sefiedgar, Z. Haghani, and H. R. Sepangi

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): A. S. Sefiedgar, Z. Haghani, and H. R. Sepangi The collision-free Boltzmann equation is used in the context of brane- f ( R ) gravity to derive the virial theorem. It is shown that the virial mass is proportional to certain geometrical terms appearing in the Einstein field equations and contributes to gravitational energy and that such a geometric m... [Phys. Rev. D 85, 064012] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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Scalar-tensor cosmologies with dust matter in the general relativity limit (2012)

Laur Järv, Piret Kuusk, and Margus Saal

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Laur Järv, Piret Kuusk, and Margus Saal We consider flat Friedmann-Lemaître-Robertson-Walker cosmological models in the framework of general scalar-tensor theories of gravity with arbitrary coupling functions, set in the Jordan frame, in the cosmological epoch when the energy density of the ordinary dust matter dominates over the energy d... [Phys. Rev. D 85, 064013] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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Finsler geometric extension of Einstein gravity (2012)

Christian Pfeifer and Mattias N. R. Wohlfarth

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Christian Pfeifer and Mattias N. R. Wohlfarth We construct gravitational dynamics for Finsler spacetimes in terms of an action integral on the unit tangent bundle. These spacetimes are generalizations of Lorentzian metric manifolds which satisfy necessary causality properties. A coupling procedure for matter fields to Finsler gravity completes ... [Phys. Rev. D 85, 064009] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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BF gravity with Immirzi parameter and matter fields (2012)

Merced Montesinos and Mercedes Velázquez

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-03-09

Description: Author(s): Merced Montesinos and Mercedes Velázquez We perform the coupling of the scalar, Maxwell, and Yang-Mills fields as well as the cosmological constant to BF gravity with Immirzi parameter. The proposed action principles employ auxiliary fields in order to keep a polynomial dependence on the B fields. By handling the equations of motion for th... [Phys. Rev. D 85, 064011] Published Thu Mar 08, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-03-09

Description: 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

Keywords: Condensed Matter: Electronic Properties, etc.

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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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Publication Date: 2012-03-09

Description: 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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Publication Date: 2012-03-09

Description: 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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Publication Date: 2012-03-09

Description: 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

Keywords: Condensed Matter: Electronic Properties, etc.

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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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Publication Date: 2012-03-09

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Classical Lagrangians for momentum dependent Lorentz violation (2012)

Don Colladay and Patrick McDonald

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): Don Colladay and Patrick McDonald Certain momentum-dependent terms in the fermion sector of the Lorentz-violating standard model extension (SME) yield solvable classical Lagrangians of a type not mentioned in the literature. These cases yield new relatively simple examples of Finsler and pseudo-Finsler structures. One of the cases i... [Phys. Rev. D 85, 044042] Published Tue Feb 21, 2012

Keywords: General relativity, gravitation

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Relativity accommodates superluminal mean velocities (2012)

B. Allés

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): B. Allés Contrary to a widespread belief, measures of velocity can yield a value larger than c , the instantaneous light speed in vacuum, without contradicting Einstein’s relativity. Nevertheless, the effect turns out to be too small to explain the recently claimed superluminal velocity by the OPERA Collabora... [Phys. Rev. D 85, 047501] Published Tue Feb 21, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-02-24

Description: 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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Publication Date: 2012-02-24

Description: 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

Keywords: Condensed Matter: Electronic Properties, etc.

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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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Publication Date: 2012-02-24

Description: 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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Publication Date: 2012-02-24

Description: 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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Publication Date: 2012-02-24

Description: 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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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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Publication Date: 2012-02-25

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-02-25

Description: 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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Publication Date: 2012-03-13

Description: 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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Publication Date: 2012-03-13

Description: 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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Publication Date: 2012-03-10

Description: 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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Publication Date: 2012-03-10

Description: 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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Publication Date: 2012-03-10

Description: 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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^{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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Publication Date: 2012-03-14

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-03-15

Description: 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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Group field theory and simplicial gravity path integrals: A model for Holst-Plebanski gravity (2012)

Aristide Baratin and Daniele Oriti

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-04

Description: Author(s): Aristide Baratin and Daniele Oriti In a recent work, a dual formulation of group field theories as noncommutative quantum field theories has been proposed, providing an exact duality between spin foam models and noncommutative simplicial path integrals for constrained BF theories. In light of this new framework, we define a model for... [Phys. Rev. D 85, 044003] Published Fri Feb 03, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-02-07

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Domain wall solution in F(R) gravity and variation of the fine structure constant (2012)

Kazuharu Bamba, Shin’ichi Nojiri, and Sergei D. Odintsov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Kazuharu Bamba, Shin’ichi Nojiri, and Sergei D. Odintsov We construct a domain wall solution in F ( R ) gravity. We reconstruct a static domain wall solution in a scalar field theory. We also reconstruct an explicit F ( R ) gravity model in which a static domain wall solution can be realized. Moreover, we show that there could exist an effective (gravitational)... [Phys. Rev. D 85, 044012] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Superconducting hair on charged black string background (2012)

Lukasz Nakonieczny and Marek Rogatko

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Lukasz Nakonieczny and Marek Rogatko Behavior of Dirac fermions in the background of a charged black string penetrated by an Abelian Higgs vortex is elaborated. One finds evidence that the system under consideration can support fermion fields acting like a superconducting cosmic string in the sense that a nontrivial Dirac fermion fiel... [Phys. Rev. D 85, 044013] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Contrasting features of anisotropic loop quantum cosmologies: The role of spatial curvature (2012)

Brajesh Gupt and Parampreet Singh

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Brajesh Gupt and Parampreet Singh A characteristic feature of loop quantization of the isotropic and Bianchi-I spacetimes is the existence of universal bounds on the energy density and the expansion and shear scalars, independent of the matter content. We investigate the properties of these physical quantities in Bianchi-II and Bian... [Phys. Rev. D 85, 044011] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Hamiltonian analysis of 1+1-dimensional massive gravity (2012)

J. Klusoň

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): J. Klusoň We perform the Hamiltonian analysis of 1+1 -dimensional nonlinear massive gravity studied in [C. de Rham, G. Gabadadze, and A. Tolley, arXiv:1107.3820]. We find the constraint structure of the given theory and perform the counting of the physical degrees of freedom. [Phys. Rev. D 85, 044010] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Weak gravitational lensing in fourth order gravity (2012)

A. Stabile and An. Stabile

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): A. Stabile and An. Stabile For a general class of analytic functions f ( R , R α β R α β , R α β γ δ R α β γ δ ) we discuss the gravitational lensing in the Newtonian limit of theory. From the properties of the Gauss-Bonnet invariant it is enough to consider only one curvature invariant between the Ricci tensor and the Riemann tensor. Then, we an... [Phys. Rev. D 85, 044014] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Observational cosmology using characteristic numerical relativity: Characteristic formalism on null geodesics (2012)

P. J. van der Walt and N. T. Bishop

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): P. J. van der Walt and N. T. Bishop The characteristic formalism of numerical relativity is based on a system of coordinates aligned with outgoing null cones. While these coordinates were designed for studying gravitational waves, they can also be easily adapted to model cosmological past null cones (PNCs). Similar to observational co... [Phys. Rev. D 85, 044016] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Black hole-neutron star mergers for 10 M_{⊙} black holes (2012)

Francois Foucart, Matthew D. Duez, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, and Saul A. Teukolsky

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Francois Foucart, Matthew D. Duez, Lawrence E. Kidder, Mark A. Scheel, Bela Szilagyi, and Saul A. Teukolsky General relativistic simulations of black hole-neutron star mergers have currently been limited to low-mass black holes ( M BH ≤7 M ⊙ ), even though population synthesis models indicate that a majority of mergers might involve more massive black holes ( M BH ≥10 M ⊙ ). We present the first general relativis... [Phys. Rev. D 85, 044015] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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Apparent horizons with nontrivial topology and the hyperhoop conjecture in six-dimensional space-times (2012)

Tomohiro Kurata, Hirotaka Nakayama, and Takahiro Okamoto

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-08

Description: Author(s): Tomohiro Kurata, Hirotaka Nakayama, and Takahiro Okamoto We investigate the validity of the hyperhoop conjecture, which claims to determine a necessary and sufficient condition for the formation of black hole horizons in higher-dimensional space-times. Here we consider momentarily static, conformally flat initial data sets, each describing a gravitational... [Phys. Rev. D 85, 044017] Published Tue Feb 07, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-09

Description: 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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Publication Date: 2012-02-11

Description: 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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Publication Date: 2012-02-11

Description: 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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Publication Date: 2012-02-11

Description: 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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Publication Date: 2012-02-11

Description: 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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Publication Date: 2012-02-11

Description: 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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Publication Date: 2012-02-14

Description: 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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Publication Date: 2012-02-15

Description: 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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Publication Date: 2012-02-15

Description: 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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Publication Date: 2012-02-15

Description: 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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Publication Date: 2012-02-15

Description: 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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Publication Date: 2012-02-15

Description: 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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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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Publication Date: 2012-02-16

Description: 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

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-02-16

Description: 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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Publication Date: 2012-02-16

Description: 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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Publication Date: 2012-02-16

Description: 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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Publication Date: 2012-02-16

Description: 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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Publication Date: 2012-02-17

Description: 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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Publication Date: 2012-02-18

Description: 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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Publication Date: 2012-02-18

Description: 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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Publication Date: 2012-02-18

Description: 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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Conformal gravity with the most general ELKO matter (2012)

Luca Fabbri

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-02-22

Description: Author(s): Luca Fabbri Recently we have constructed the conformal gravity with metric and torsion, finding the gravitational field equations that give the conservation laws and trace condition; in the present paper we apply this theory to the case of ELKO matter field, proving that their spin and energy densities once the... [Phys. Rev. D 85, 047502] Published Tue Feb 21, 2012

Keywords: General relativity, gravitation

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Pressure dependence of the monoclinic phase in (1−x)Pb(Mg_{1/3}Nb_{2/3})O_{3}-xPbTiO_{3} solid solutions (2012)

Muhtar Ahart, Stanislav Sinogeikin, Olga Shebanova, Daijo Ikuta, Zuo-Guang Ye, Ho-kwang Mao, R. E. Cohen, and Russell J. Hemley

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): Muhtar Ahart, Stanislav Sinogeikin, Olga Shebanova, Daijo Ikuta, Zuo-Guang Ye, Ho-kwang Mao, R. E. Cohen, and Russell J. Hemley We combine high-pressure x-ray diffraction, high-pressure Raman scattering, and optical microscopy to investigate a series of (1− x )Pb(Mg 1/3 Nb 2/3 )O 3 - x PbTiO 3 (PMN- x PT) solid solutions ( x =0.2, 0.3, 0.33, 0.35, 0.37, 0.4) in diamond anvil cells up to 20 GPa at 300 K. The Raman spectra show a peak center... [Phys. Rev. B 86, 224111] Published Wed Dec 26, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-12-27

Description: 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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Publication Date: 2012-12-27

Description: 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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Publication Date: 2012-12-27

Description: 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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Defect stability in phase-field crystal models: Stacking faults and partial dislocations (2012)

Joel Berry, Nikolas Provatas, Jörg Rottler, and Chad W. Sinclair

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): Joel Berry, Nikolas Provatas, Jörg Rottler, and Chad W. Sinclair The primary factors controlling defect stability in phase-field crystal (PFC) models are examined, with illustrative examples involving several existing variations of the model. Guidelines are presented for constructing models with stable defect structures that maintain high numerical efficiency. Th... [Phys. Rev. B 86, 224112] Published Thu Dec 27, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Dynamics of Dirac-Born-Infeld dark energy interacting with dark matter (2012)

Chakkrit Kaeonikhom, Douglas Singleton, Sergey V. Sushkov, and N. Yongram

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-12-28

Description: Author(s): Chakkrit Kaeonikhom, Douglas Singleton, Sergey V. Sushkov, and N. Yongram We study the dynamics of Dirac-Born-Infeld (DBI) dark energy interacting with dark matter. The DBI dark energy model considered here has a scalar field with a nonstandard kinetic energy term, and has potential and brane tension that are power-law functions. The new feature considered here is an inte... [Phys. Rev. D 86, 124049] Published Thu Dec 27, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-12-29

Description: 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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Publication Date: 2012-12-29

Description: 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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Publication Date: 2012-12-29

Description: 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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Low-energy structures of zinc borohydride Zn(BH_{4})_{2} (2012)

Tran Doan Huan, Maximilian Amsler, Vu Ngoc Tuoc, Alexander Willand, and Stefan Goedecker

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-20

Description: Author(s): Tran Doan Huan, Maximilian Amsler, Vu Ngoc Tuoc, Alexander Willand, and Stefan Goedecker We present a systematic study of the low-energy structures of zinc borohydride, a crystalline material proposed for the purpose of hydrogen storage. In addition to previously proposed structures, many new low-energy structures of zinc borohydride are found by utilizing the minima-hopping method. We ... [Phys. Rev. B 86, 224110] Published Wed Dec 19, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Stress-induced solid flow drives surface nanopatterning of silicon by ion-beam irradiation (2012)

M. Castro, R. Gago, L. Vázquez, J. Muñoz-García, and R. Cuerno

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-20

Description: Author(s): M. Castro, R. Gago, L. Vázquez, J. Muñoz-García, and R. Cuerno Ion-beam sputtering (IBS) is known to produce surface nanopatterns over macroscopic areas on a wide range of materials. However, in spite of the technological potential of this route to nanostructuring, the physical process by which these surfaces self-organize remains poorly understood. We have per... [Phys. Rev. B 86, 214107] Published Wed Dec 19, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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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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Publication Date: 2012-12-21

Description: 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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Discrete energy levels of bright solitons in lithium niobate ferroelectrics (2012)

Pradipta Giri, Kamal Choudhary, Arghya Dey, Arindam Biswas, Aniruddha Ghosal, and A. K. Bandyopadhyay

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-03

Description: Author(s): Pradipta Giri, Kamal Choudhary, Arghya Dey, Arindam Biswas, Aniruddha Ghosal, and A. K. Bandyopadhyay In the framework of a simple model of a one-dimensional array of a ferroelectric slab of domains, the polarization with time and space is explained by the Klein-Gordon equation. A perturbation of the K-G equation makes it possible to use this continuum model through a progressive-wave nonlinear Schr... [Phys. Rev. B 86, 184101] Published Thu Nov 01, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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Gravitational wave background from rotating neutron stars (2012)

Pablo A. Rosado

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-03

Description: Author(s): Pablo A. Rosado The background of gravitational waves produced by the ensemble of rotating neutron stars (which includes pulsars, magnetars, and gravitars) is investigated. A formula for Ω ( f ) (a function that is commonly used to quantify the background, and is directly related to its energy density) is derived, wit... [Phys. Rev. D 86, 104007] Published Fri Nov 02, 2012

Keywords: General relativity, gravitation

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Charged cylindrical black holes in conformal gravity (2012)

Jackson Levi Said, Joseph Sultana, and Kristian Zarb Adami

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-03

Description: Author(s): Jackson Levi Said, Joseph Sultana, and Kristian Zarb Adami Considering cylindrical topology, we present the static solution for a charged black hole in conformal gravity. We show that unlike the general relativistic case, there are two different solutions, both including a factor which gives rise to a linear term in the potential, which also features in the... [Phys. Rev. D 86, 104009] Published Fri Nov 02, 2012

Keywords: General relativity, gravitation

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Exact self-accelerating cosmologies in the ghost-free massive gravity: The detailed derivation (2012)

Mikhail S. Volkov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Mikhail S. Volkov We present the detailed derivation of the recently announced most general cosmological solution with homogeneous and isotropic metric in the ghost-free massive gravity theory. We use the standard parametrization of the theory in terms of the matrix square root, and then show how the same results are... [Phys. Rev. D 86, 104022] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Particle creation due to tachyonic instability in relativistic stars (2012)

A. G. S. Landulfo, W. C. C. Lima, G. E. A. Matsas, and D. A. T. Vanzella

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): A. G. S. Landulfo, W. C. C. Lima, G. E. A. Matsas, and D. A. T. Vanzella Dense enough compact objects were recently shown to lead to an exponentially fast increase of the vacuum energy density for some free scalar fields properly coupled to the spacetime curvature as a consequence of a tachyonic-like instability. Once the effect is triggered, the star energy density woul... [Phys. Rev. D 86, 104025] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Stationary scalar clouds around rotating black holes (2012)

Shahar Hod

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Shahar Hod Motivated by novel results in the theory of wave dynamics in black-hole spacetimes, we analyze the dynamics of a massive scalar field surrounding a rapidly rotating Kerr black hole. In particular, we report on the existence of stationary ( infinitely long-lived) regular field configurations in the ba... [Phys. Rev. D 86, 104026] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Solar system tests and interpretation of gauge field and Newtonian prepotential in general covariant Hořava-Lifshitz gravity (2012)

Kai Lin, Shinji Mukohyama, and Anzhong Wang

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Kai Lin, Shinji Mukohyama, and Anzhong Wang In this paper, we first study spherically symmetric, stationary vacuum configurations in general covariant theory [ U (1) extension] of Hořava-Lifshitz gravity with the projectability condition and an arbitrary value of the coupling constant λ . We obtain all the solutions with the assumed symmetry in ... [Phys. Rev. D 86, 104024] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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High-order expansions of the Detweiler-Whiting singular field in Schwarzschild spacetime (2012)

Anna Heffernan, Adrian Ottewill, and Barry Wardell

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Anna Heffernan, Adrian Ottewill, and Barry Wardell The self-field of a charged particle has a singular component which diverges at the particle. We use both coordinate and covariant approaches to compute an expansion of this singular field for particles in generic geodesic orbits about a Schwarzschild black hole for scalar, electromagnetic and gravi... [Phys. Rev. D 86, 104023] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-11-08

Description: 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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Publication Date: 2012-11-08

Description: 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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Publication Date: 2012-11-08

Description: 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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90

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Stationary closed strings in five-dimensional flat spacetime (2012)

Takahisa Igata, Hideki Ishihara, and Keisuke Nishiwaki

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Takahisa Igata, Hideki Ishihara, and Keisuke Nishiwaki We investigate stationary rotating closed Nambu-Goto strings in five-dimensional flat spacetime. The stationary string is defined as a world sheet that is tangent to a timelike Killing vector. The Nambu-Goto equation of motion for the stationary string is reduced to the geodesic equation on the orbi... [Phys. Rev. D 86, 104020] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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Anomaly and the self-energy of electric charges (2012)

Valeri P. Frolov and Andrei Zelnikov

American Physical Society (APS)

In: Physical Review D

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Publication Date: 2012-11-08

Description: Author(s): Valeri P. Frolov and Andrei Zelnikov We study the self-energy of a charged particle located in a static D-dimensional gravitational field. We show that the energy functional for this problem is invariant under an infinite dimensional (gauge) group of transformations parametrized by one scalar function of ( D -1)—variables. We demonstrate... [Phys. Rev. D 86, 104021] Published Wed Nov 07, 2012

Keywords: General relativity, gravitation

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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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Publication Date: 2012-11-09

Description: 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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Publication Date: 2012-11-09

Description: 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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Publication Date: 2012-11-10

Description: 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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Publication Date: 2012-11-10

Description: 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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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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Publication Date: 2012-11-14

Description: 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

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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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Publication Date: 2012-11-14

Description: 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

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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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Publication Date: 2012-11-14

Description: 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

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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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Publication Date: 2012-11-14

Description: 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

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Effects of rare-earth ion size on the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites (2012)

T. F. Seman, K. H. Ahn, T. Lookman, A. Saxena, A. R. Bishop, and P. B. Littlewood

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-11-13

Description: Author(s): T. F. Seman, K. H. Ahn, T. Lookman, A. Saxena, A. R. Bishop, and P. B. Littlewood We present a theoretical study on the relation between the size of the rare earth ion, often known as chemical pressure, and the stability of the coherent Jahn-Teller distortions in undoped perovskite manganites. Using a Keating model expressed in terms of atomic scale symmetry modes for a simplifie... [Phys. Rev. B 86, 184106] Published Mon Nov 12, 2012

Keywords: Structure, structural phase transitions, mechanical properties, defects

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