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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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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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Publication Date: 2012-03-09

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Nanoscale Deformation of a Liquid Surface (2012)

Rene Ledesma-Alonso, Dominique Legendre, and Philippe Tordjeman

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-03-09

Description: Author(s): Rene Ledesma-Alonso, Dominique Legendre, and Philippe Tordjeman We study the interaction between a solid particle and a liquid interface. A semianalytical solution of the nonlinear equation that describes the interface deformation points out the existence of a bifurcation behavior for the apex deformation as a function of the distance. We show that the apex curv... [Phys. Rev. Lett. 108, 106104] Published Thu Mar 08, 2012

Keywords: Condensed Matter: Structure, 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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Stabilization of one-dimensional solitons against the critical collapse by quintic nonlinear lattices (2012)

Jianhua Zeng and Boris A. Malomed

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Jianhua Zeng and Boris A. Malomed It has recently been discovered that stabilization of two-dimensional (2D) solitons against the critical collapse in media with cubic nonlinearity by means of nonlinear lattices (NLs) is a challenging problem. We address the one-dimensional (1D) version of the problem, i.e., the nonlinear-Schrödinge... [Phys. Rev. A 85, 023824] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Dynamic quantum Kerr effect in circuit quantum electrodynamics (2012)

Yi Yin, H. Wang, M. Mariantoni, Radoslaw C. Bialczak, R. Barends, Y. Chen, M. Lenander, Erik Lucero, M. Neeley, A. D. O'Connell, D. Sank, M. Weides, J. Wenner, T. Yamamoto, J. Zhao, A. N. Cleland, and John M. Martinis

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Yi Yin, H. Wang, M. Mariantoni, Radoslaw C. Bialczak, R. Barends, Y. Chen, M. Lenander, Erik Lucero, M. Neeley, A. D. O'Connell, D. Sank, M. Weides, J. Wenner, T. Yamamoto, J. Zhao, A. N. Cleland, and John M. Martinis A superconducting qubit coupled to a microwave resonator provides a controllable system that enables fundamental studies of light-matter interactions. In the dispersive regime, photons in the resonator exhibit induced frequency and phase shifts which are revealed in the resonator transmission spectr... [Phys. Rev. A 85, 023826] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Slow-light dispersion properties of multiatomic multiband coupled-resonator optical waveguides (2012)

Sunkyu Yu, Xianji Piao, and Namkyoo Park

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Sunkyu Yu, Xianji Piao, and Namkyoo Park In this paper, we investigate the dispersion properties of a multiatomic coupled-resonator optical waveguide (CROW), and show the existence of band-dependent group velocities in its slow-light bands. By including the next-nearest-neighbor coupling terms in a coupled-mode theory (CMT) analysis for th... [Phys. Rev. A 85, 023823] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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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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Publication Date: 2012-02-22

Description: 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

Keywords: 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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Publication Date: 2012-02-22

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Experimental and theoretical studies of two-color-pump resonance-induced enhancement of odd and even harmonics from a tin plasma (2012)

R. A. Ganeev, V. V. Strelkov, C. Hutchison, A. Zaïr, D. Kilbane, M. A. Khokhlova, and J. P. Marangos

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): R. A. Ganeev, V. V. Strelkov, C. Hutchison, A. Zaïr, D. Kilbane, M. A. Khokhlova, and J. P. Marangos We study high-order harmonic generation from a laser-produced tin plasma using 780 and 390 nm, 40 fs, 1 kHz pulses. Varying the chirp of the laser radiation, we observe variation of the harmonic frequency and intensity. The enhanced 16th and 17th harmonics are attributed to the influence of the stro... [Phys. Rev. A 85, 023832] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Quantum-state transmission in a cavity array via two-photon exchange (2012)

Yu-Li Dong, Shi-Qun Zhu, and Wen-Long You

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Yu-Li Dong, Shi-Qun Zhu, and Wen-Long You The dynamical behavior of a coupled cavity array is investigated when each cavity contains a three-level atom. For the uniform and staggered intercavity hopping, the whole system Hamiltonian can be analytically diagonalized in the subspace of single-atom excitation. The quantum-state transfer along ... [Phys. Rev. A 85, 023833] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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

F. Pei-Jen Lin and A. Gurevich

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-25

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

Keywords: Superfluidity and superconductivity

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Collective population evolution of two-level atoms based on mean-field theory (2012)

Hiroyuki Takeda

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-25

Description: Author(s): Hiroyuki Takeda I theoretically demonstrate the collective population evolution of two-level atoms, based on the mean-field theory. Optical materials with abrupt changes of electromagnetic local densities of states enable steady-state population inversion of two-level atoms which is generally considered impossible.... [Phys. Rev. A 85, 023837] Published Fri Feb 24, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Kramers-Kronig relations and high-order nonlinear susceptibilities (2012)

Carsten Brée, Ayhan Demircan, and Günter Steinmeyer

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Carsten Brée, Ayhan Demircan, and Günter Steinmeyer As previous theoretical results recently revealed, a Kramers-Kronig transform of multiphoton absorption rates allows for a precise prediction on the dispersion of the nonlinear refractive index n 2 in the near infrared. It was shown that this method allows reproduction of recent experimental results ... [Phys. Rev. A 85, 033806] Published Mon Mar 12, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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How Does Adhesion Induce the Formation of Telephone Cord Buckles? (2012)

Jean-Yvon Faou, Guillaume Parry, Sergey Grachev, and Etienne Barthel

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-03-13

Description: Author(s): Jean-Yvon Faou, Guillaume Parry, Sergey Grachev, and Etienne Barthel Compressively stressed thin films with low adhesion frequently buckle and delaminate simultaneously into telephone cords. Although these buckles have been studied for decades, no complete understanding of their propagation has so far been presented. In this study, we have coupled a nonlinear plate d... [Phys. Rev. Lett. 108, 116102] Published Mon Mar 12, 2012

Keywords: Condensed Matter: Structure, etc.

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Adsorbate Induced Restructuring of TiO_{2}(011)-(2×1) Leads to One-Dimensional Nanocluster Formation (2012)

Qian Cuan, Junguang Tao, Xue-Qing Gong, and Matthias Batzill

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-03-10

Description: Author(s): Qian Cuan, Junguang Tao, Xue-Qing Gong, and Matthias Batzill Metal oxide surfaces have been thought to be fairly rigid. On the example of rutile TiO 2 (011) we show that this is not necessarily the case. This surface restructures by interacting with molecules. The synergic effect of adsorbates causes a strictly directional reorganization of the substrate, which... [Phys. Rev. Lett. 108, 106105] Published Fri Mar 09, 2012

Keywords: Condensed Matter: Structure, etc.

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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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Dipolar Molecules in Optical Lattices (2012)

Tomasz Sowiński, Omjyoti Dutta, Philipp Hauke, Luca Tagliacozzo, and Maciej Lewenstein

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-03-14

Description: Author(s): Tomasz Sowiński, Omjyoti Dutta, Philipp Hauke, Luca Tagliacozzo, and Maciej Lewenstein We study the extended Bose-Hubbard model describing an ultracold gas of dipolar molecules in an optical lattice, taking into account all on-site and nearest-neighbor interactions, including occupation-dependent tunneling and pair tunneling terms. Using exact diagonalization and the multiscale entang... [Phys. Rev. Lett. 108, 115301] Published Tue Mar 13, 2012

Keywords: Condensed Matter: Structure, etc.

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Anderson localization of light at the interface between linear and nonlinear dielectric media with an optically induced photonic lattice (2012)

Dragana M. Jović, Milivoj R. Belić, and Cornelia Denz

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-13

Description: Author(s): Dragana M. Jović, Milivoj R. Belić, and Cornelia Denz In a numerical study, we observe Anderson localization of surface modes at the interface between a linear and a nonlinear dielectric medium, containing an optically induced disordered photonic lattice. We discover the threshold for the existence of such localized modes. The influence of Kerr nonline... [Phys. Rev. A 85, 031801] Published Mon Mar 12, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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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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Publication Date: 2012-03-15

Description: 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

Keywords: Electronic structure and strongly correlated systems

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

Annica M. Black-Schaffer and Alexander V. Balatsky

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

Description: 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

Keywords: Electronic structure and strongly correlated systems

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Retrieval of multiple spin waves from a weakly excited, metastable atomic ensemble (2012)

F. Bariani and T. A. B. Kennedy

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): F. Bariani and T. A. B. Kennedy The emission of light from a multiply excited atomic ensemble is examined and it is shown how symmetric (spin-wave) and nonsymmetric states of excitation radiate into spatially separate field modes. This observation has potential application to single-photon generation and spin-wave entanglement, si... [Phys. Rev. A 85, 033811] Published Wed Mar 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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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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Publication Date: 2012-03-15

Description: 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

Keywords: Electronic structure and strongly correlated systems

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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Anisotropic vortex lattice structures in the FeSe superconductor (2012)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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Intrapulse quantum spectral correlation of femtosecond optical pulses in optical fiber (2012)

Heongkyu Ju

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-03-15

Description: Author(s): Heongkyu Ju Intrapulse quantum spectral correlation of photon numbers of a femtosecond optical pulse, which propagates a 5-m-long optical fiber, is presented in a matrix format for quantum noise study by numerical calculation. The calculation includes the higher-order optical effects such as intrapulse-stimulat... [Phys. Rev. A 85, 033810] Published Wed Mar 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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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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Publication Date: 2012-03-15

Description: 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

Keywords: Electronic structure and strongly correlated systems

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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

Chung-Pin Chou and Ting-Kuo Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-03-15

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

Keywords: Superfluidity and superconductivity

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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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Quasiclassical and ultraquantum decay of superfluid turbulence (2012)

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

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

Keywords: Superfluidity and superconductivity

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-05

Description: 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

Keywords: Electronic structure and strongly correlated systems

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Circular differential scattering of polarized light by a chiral random medium (2012)

Jérôme Crassous, Axelle Amon, and Jeanne Crassous

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-08

Description: Author(s): Jérôme Crassous, Axelle Amon, and Jeanne Crassous Differential scattering of left- and right-handed circularly polarized waves is a general property of scattering media lacking space-inversion symmetry. We show in this paper that this scattering difference has remarkable properties in the case of an almost transparent chiral random medium. By tunin... [Phys. Rev. A 85, 023806] Published Tue Feb 07, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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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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Morphology of Lamellae-Forming Block Copolymer Films between Two Orthogonal Chemically Nanopatterned Striped Surfaces (2012)

Guoliang Liu, Abelardo Ramírez-Hernández, Hiroshi Yoshida, Kim Nygård, Dillip K. Satapathy, Oliver Bunk, Juan J. de Pablo, and Paul F. Nealey

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-09

Description: Author(s): Guoliang Liu, Abelardo Ramírez-Hernández, Hiroshi Yoshida, Kim Nygård, Dillip K. Satapathy, Oliver Bunk, Juan J. de Pablo, and Paul F. Nealey The structure of block copolymers results from the interplay between weak intermolecular forces, typically in the order of k B T per molecule. This is particularly true for block copolymer thin films in the presence of chemically patterned surfaces, where the different contributions to the total free ... [Phys. Rev. Lett. 108, 065502] Published Wed Feb 08, 2012

Keywords: Condensed Matter: Structure, etc.

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Monitoring stimulated emission at the single-photon level in one-dimensional atoms (2012)

D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard, J. M. Gérard, M. F. Santos, and A. Auffèves

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-10

Description: Author(s): D. Valente, S. Portolan, G. Nogues, J. P. Poizat, M. Richard, J. M. Gérard, M. F. Santos, and A. Auffèves We theoretically investigate signatures of stimulated emission at the single-photon level for a two-level atom interacting with a one-dimensional light field. We consider the transient regime where the atom is initially excited, and the steady-state regime where the atom is continuously driven with ... [Phys. Rev. A 85, 023811] Published Thu Feb 09, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Quantum theory analysis of triple photons generated by a χ^{(3)} process (2012)

A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-10

Description: Author(s): A. Dot, A. Borne, B. Boulanger, K. Bencheikh, and J. A. Levenson We present a quantum theoretical analysis of triple photons generated by a phase-matched third-order nonlinear process in a KTP crystal in a weak-interaction regime. We show that the quantum properties of the triple photons can be brought to light through optical second- and third-order sum frequenc... [Phys. Rev. A 85, 023809] Published Thu Feb 09, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Fracture Strength of Disordered Media: Universality, Interactions, and Tail Asymptotics (2012)

Claudio Manzato, Ashivni Shekhawat, Phani K. V. V. Nukala, Mikko J. Alava, James P. Sethna, and Stefano Zapperi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-11

Description: Author(s): Claudio Manzato, Ashivni Shekhawat, Phani K. V. V. Nukala, Mikko J. Alava, James P. Sethna, and Stefano Zapperi We study the asymptotic properties of fracture strength distributions of disordered elastic media by a combination of renormalization group, extreme value theory, and numerical simulation. We investigate the validity of the “weakest-link hypothesis” in the presence of realistic long-ranged interacti... [Phys. Rev. Lett. 108, 065504] Published Fri Feb 10, 2012

Keywords: Condensed Matter: Structure, etc.

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Tuning the Growth Orientation of Epitaxial Films by Interface Chemistry (2012)

Matthias Gubo, Christina Ebensperger, Wolfgang Meyer, Lutz Hammer, Klaus Heinz, Florian Mittendorfer, and Josef Redinger

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-11

Description: Author(s): Matthias Gubo, Christina Ebensperger, Wolfgang Meyer, Lutz Hammer, Klaus Heinz, Florian Mittendorfer, and Josef Redinger The support of epitaxial films frequently determines their crystallographic orientation, which is of crucial importance for their properties. We report a novel way to alter the film orientation without changing the substrate. We show for the growth of CoO on the Ir(100) surface that, while the oxide... [Phys. Rev. Lett. 108, 066101] Published Fri Feb 10, 2012

Keywords: Condensed Matter: Structure, etc.

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Structures, Energetics, and Dynamics of Helium Adsorbed on Isolated Fullerene Ions (2012)

Christian Leidlmair, Yang Wang, Peter Bartl, Harald Schöbel, Stephan Denifl, Michael Probst, Manuel Alcamí, Fernando Martín, Henning Zettergren, Klavs Hansen, Olof Echt, and Paul Scheier

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-14

Description: Author(s): Christian Leidlmair, Yang Wang, Peter Bartl, Harald Schöbel, Stephan Denifl, Michael Probst, Manuel Alcamí, Fernando Martín, Henning Zettergren, Klavs Hansen, Olof Echt, and Paul Scheier Helium adsorbed on C 60 + and C 70 + exhibits phenomena akin to helium on graphite. Mass spectra suggest that commensurate layers form when all carbon hexagons and pentagons are occupied by one He each, but that the solvation shell does not close until 60 He atoms are adsorbed on C 60 + , or 62 on C 70 + . Mo... [Phys. Rev. Lett. 108, 076101] Published Mon Feb 13, 2012

Keywords: Condensed Matter: Structure, etc.

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Photon-number distributions of twin beams generated in spontaneous parametric down-conversion and measured by an intensified CCD camera (2012)

Jan Peřina, Jr., Martin Hamar, Václav Michálek, and Ondřej Haderka

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-15

Description: Author(s): Jan Peřina, Jr., Martin Hamar, Václav Michálek, and Ondřej Haderka The measurement of photon-number statistics of fields composed of photon pairs, generated in spontaneous parametric down-conversion and detected by an intensified charge-coupled device (iCCD) camera, is described. Final quantum detection efficiencies, electronic noises, finite numbers of detector pi... [Phys. Rev. A 85, 023816] Published Tue Feb 14, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Topologically Induced Avoided Band Crossing in an Optical Checkerboard Lattice (2012)

Matthias Ölschläger, Georg Wirth, Thorge Kock, and Andreas Hemmerich

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-15

Description: Author(s): Matthias Ölschläger, Georg Wirth, Thorge Kock, and Andreas Hemmerich We report on the condensation of bosons in the 4th band of an optical checkerboard lattice providing a topologically induced avoided band crossing involving the 2nd, 3rd, and 4th Bloch bands. When the condensate is slowly tuned through the avoided crossing, accelerated band relaxation arises and the... [Phys. Rev. Lett. 108, 075302] Published Tue Feb 14, 2012

Keywords: Condensed Matter: Structure, etc.

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Thermal Conductance of Ballistic Point Contacts (2012)

Th. Bartsch, M. Schmidt, Ch. Heyn, and W. Hansen

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-15

Description: Author(s): Th. Bartsch, M. Schmidt, Ch. Heyn, and W. Hansen We study the thermal conductance of ballistic point contacts. These contacts are realized as few nanometer long pillars in so-called air-gap heterostructures (AGHs). The pillar length is orders of magnitude smaller than the mean free path of the phonons up to room temperature. Because of the small d... [Phys. Rev. Lett. 108, 075901] Published Tue Feb 14, 2012

Keywords: Condensed Matter: Structure, etc.

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Shape Transitions in Strained Cu Islands on Ni(100): Kinetics versus Energetics (2012)

Yunsic Shim and Jacques G. Amar

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-15

Description: Author(s): Yunsic Shim and Jacques G. Amar We examine the ramified islands observed in submonolayer Cu/Ni(100) growth. Our results indicate that the strain-energy contribution to the dependence of island energy on shape is surprisingly weak. In contrast, our accelerated dynamics simulations indicate that unexpected concerted popout processes... [Phys. Rev. Lett. 108, 076102] Published Tue Feb 14, 2012

Keywords: Condensed Matter: Structure, etc.

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-16

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

Keywords: Superfluidity and superconductivity

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

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

American Physical Society (APS)

In: Physical Review B

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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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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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Publication Date: 2012-02-16

Description: 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

Keywords: Electronic structure and strongly correlated systems

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Fermionization of Two Distinguishable Fermions (2012)

G. Zürn, F. Serwane, T. Lompe, A. N. Wenz, M. G. Ries, J. E. Bohn, and S. Jochim

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-02-17

Description: Author(s): G. Zürn, F. Serwane, T. Lompe, A. N. Wenz, M. G. Ries, J. E. Bohn, and S. Jochim We study a system of two distinguishable fermions in a 1D harmonic potential. This system has the exceptional property that there is an analytic solution for arbitrary values of the interparticle interaction. We tune the interaction strength and compare the measured properties of the system to the t... [Phys. Rev. Lett. 108, 075303] Published Thu Feb 16, 2012

Keywords: Condensed Matter: Structure, etc.

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-02-17

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

Keywords: Superfluidity and superconductivity

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Spectral properties of photon pairs generated by spontaneous four-wave mixing in inhomogeneous photonic crystal fibers (2012)

Liang Cui, Xiaoying Li, and Ningbo Zhao

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-02-22

Description: Author(s): Liang Cui, Xiaoying Li, and Ningbo Zhao The photonic crystal fiber (PCF) is one of the excellent media for generating photon pairs via spontaneous four-wave mixing. Here we study how the inhomogeneity of PCFs affect the spectral properties of photon pairs from both the theoretical and experimental aspects. The theoretical model shows that... [Phys. Rev. A 85, 023825] Published Tue Feb 21, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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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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Publication Date: 2012-02-22

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Electronic ISSN: 1089-4918

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

Enver Nakhmedov, Oktay Alekperov, and Reinhold Oppermann

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

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

Keywords: Superfluidity and superconductivity

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

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

Keywords: Superfluidity and superconductivity

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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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Publication Date: 2012-12-22

Description: 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

Keywords: Electronic structure and strongly correlated systems

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

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

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Publication Date: 2012-12-22

Description: 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

Keywords: Electronic structure and strongly correlated systems

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c-axis optical sum in underdoped superconducting cuprates (2012)

J. P. Carbotte and E. Schachinger

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-22

Description: Author(s): J. P. Carbotte and E. Schachinger In conventional metals, the total optical spectral weight under the real part of the dynamical conductivity remains unchanged in going from normal to superconducting state. In the underdoped cuprates, however, experiments found that the interlayer conductivity no longer respects this sum rule. Here,... [Phys. Rev. B 86, 224512] Published Fri Dec 21, 2012

Keywords: Superfluidity and superconductivity

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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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Hydrostatic and uniaxial pressure dependence of superconducting transition temperature of KFe_{2}As_{2} single crystals (2012)

Sergey L. Bud'ko, Yong Liu, Thomas A. Lograsso, and Paul C. Canfield

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): Sergey L. Bud'ko, Yong Liu, Thomas A. Lograsso, and Paul C. Canfield We present heat capacity, c -axis thermal expansion and pressure-dependent, low-field, temperature-dependent magnetization for pressures up to ∼12 kbar, data for KFe 2 As 2 single crystals. T c decreases under pressure with d T c / d P ≈−0.10 K/kbar. The inferred uniaxial, c -axis, pressure derivative is positi... [Phys. Rev. B 86, 224514] Published Wed Dec 26, 2012

Keywords: Superfluidity and superconductivity

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Superconductivity of doped Weyl semimetals: Finite-momentum pairing and electronic analog of the ^{3}He-A phase (2012)

Gil Young Cho, Jens H. Bardarson, Yuan-Ming Lu, and Joel E. Moore

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): Gil Young Cho, Jens H. Bardarson, Yuan-Ming Lu, and Joel E. Moore We study superconducting states of doped inversion-symmetric Weyl semimetals. Specifically, we consider a lattice model realizing a Weyl semimetal with an inversion symmetry and study the superconducting instability in the presence of a short-ranged attractive interaction. With a phonon-mediated att... [Phys. Rev. B 86, 214514] Published Wed Dec 26, 2012

Keywords: Superfluidity and superconductivity

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Self-induced pinning of vortices in the presence of ac driving force in magnetic superconductors (2012)

Lev N. Bulaevskii and Shi-Zeng Lin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-27

Description: Author(s): Lev N. Bulaevskii and Shi-Zeng Lin We derive the response of the magnetic superconductors in the vortex state to the ac Lorentz force, F L ( t )= F ac sin( ω t ), taking into account the interaction of vortices with the magnetic moments described by the relaxation dynamics (polaronic effect). At low amplitudes of the driving force F ac the diss... [Phys. Rev. B 86, 224513] Published Wed Dec 26, 2012

Keywords: Superfluidity and superconductivity

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First-Principles Molecular Dynamics at a Constant Electrode Potential (2012)

Nicéphore Bonnet, Tetsuya Morishita, Osamu Sugino, and Minoru Otani

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-12-27

Description: Author(s): Nicéphore Bonnet, Tetsuya Morishita, Osamu Sugino, and Minoru Otani A simulation scheme for performing first-principles molecular dynamics at a constant electrode potential is presented, opening the way for a more realistic modeling of voltage-driven devices. The system is allowed to exchange electrons with a reservoir at fixed potential, and dynamical equations for... [Phys. Rev. Lett. 109, 266101] Published Wed Dec 26, 2012

Keywords: Condensed Matter: Structure, etc.

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Damage Mechanisms of Porous Materials due to In-Pore Salt Crystallization (2012)

Mara Schiro, Encarnacion Ruiz-Agudo, and Carlos Rodriguez-Navarro

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-12-27

Description: Author(s): Mara Schiro, Encarnacion Ruiz-Agudo, and Carlos Rodriguez-Navarro Pressure exerted by crystallization of salts within porous materials contributes to damage in historic and modern construction. By unequivocally identifying the precipitating phase(s) while simultaneously determining solution supersaturation and associated crystallization pressure in subsurface pore... [Phys. Rev. Lett. 109, 265503] Published Wed Dec 26, 2012

Keywords: Condensed Matter: Structure, etc.

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Inhibitive Influence of Oxygen Vacancies for Photoactivity on TiO_{2}(110) (2012)

Zhi-Tao Wang, N. Aaron Deskins, Michael A. Henderson, and Igor Lyubinetsky

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-12-27

Description: Author(s): Zhi-Tao Wang, N. Aaron Deskins, Michael A. Henderson, and Igor Lyubinetsky Scanning tunneling microscopy results reveal a pronounced site selectivity in the hole-mediated photooxidation of trimethyl acetate (TMA) on TiO 2 (110), wherein the reaction readily occurs at regular Ti sites but is completely inhibited at oxygen vacancy ( V O ) defects. Utilizing electron energy loss s... [Phys. Rev. Lett. 109, 266103] Published Wed Dec 26, 2012

Keywords: Condensed Matter: Structure, etc.

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Extraordinarily Long-Ranged Structural Relaxation in Defective Achiral Carbon Nanotubes (2012)

Michael R. C. Hunt and Stewart J. Clark

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-12-27

Description: Author(s): Michael R. C. Hunt and Stewart J. Clark We present a systematic ab initio density functional theory–based study which demonstrates that even one of the simplest defects in single-wall carbon nanotubes, the reconstructed monovacancy (a pentagonal ring and a single dangling bond known as a 5-1db defect), leads to extraordinarily long-ranged... [Phys. Rev. Lett. 109, 265502] Published Wed Dec 26, 2012

Keywords: Condensed Matter: Structure, etc.

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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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Electronic ISSN: 1089-4918

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Reply to “Comment on ‘Symmetry of Kelvin-wave dynamics and the Kelvin-wave cascade in the T=0 superfluid turbulence’ ” (2012)

E. B. Sonin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-28

Description: Author(s): E. B. Sonin The goal of the Comment by L’vov and Nazarenko is to refute my perviously published criticism of their mechanism of the Kelvin-wave cascade. It is important, however, that, in their Comment, L’vov and Nazarenko admitted that the Hamiltonian, from which they derived their mechanism, is not tilt invar... [Phys. Rev. B 86, 226502] Published Thu Dec 27, 2012

Keywords: Superfluidity and superconductivity

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Disordered Bosons in One Dimension: From Weak- to Strong-Randomness Criticality (2012)

Fawaz Hrahsheh and Thomas Vojta

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2012-12-28

Description: Author(s): Fawaz Hrahsheh and Thomas Vojta We investigate the superfluid-insulator quantum phase transition of one-dimensional bosons with off-diagonal disorder by means of large-scale Monte Carlo simulations. For weak disorder, we find the transition to be in the same universality class as the superfluid-Mott insulator transition of the cle... [Phys. Rev. Lett. 109, 265303] Published Thu Dec 27, 2012

Keywords: Condensed Matter: Structure, etc.

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Spin-orbit-induced chirality of Andreev states in Josephson junctions (2012)

Andres A. Reynoso, Gonzalo Usaj, C. A. Balseiro, D. Feinberg, and M. Avignon

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): Andres A. Reynoso, Gonzalo Usaj, C. A. Balseiro, D. Feinberg, and M. Avignon We study Josephson junctions (JJs) in which the region between the two superconductors is a multichannel system with Rashba spin-orbit coupling (SOC) where a barrier or a quantum point contact (QPC) is present. These systems might present unconventional Josephson effects such as Josephson currents f... [Phys. Rev. B 86, 214519] Published Fri Dec 28, 2012

Keywords: Superfluidity and superconductivity

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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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Publication Date: 2012-12-29

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Publication Date: 2012-12-29

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Publication Date: 2012-12-29

Description: 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

Keywords: Electronic structure and strongly correlated systems

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Hydrostatic-pressure tuning of magnetic, nonmagnetic, and superconducting states in annealed Ca(Fe_{1−x}Co_{x})_{2}As_{2} (2012)

E. Gati, S. Köhler, D. Guterding, B. Wolf, S. Knöner, S. Ran, S. L. Bud'ko, P. C. Canfield, and M. Lang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2012-12-29

Description: Author(s): E. Gati, S. Köhler, D. Guterding, B. Wolf, S. Knöner, S. Ran, S. L. Bud'ko, P. C. Canfield, and M. Lang We report on measurements of the magnetic susceptibility and electrical resistance under He-gas pressure on single crystals of Ca(Fe 1− x Co x ) 2 As 2 . We find that for properly heat-treated crystals with modest Co concentration, x = 0.028, the salient ground states associated with iron-arsenide supercondu... [Phys. Rev. B 86, 220511] Published Fri Dec 28, 2012

Keywords: Superfluidity and superconductivity

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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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Publication Date: 2012-12-29

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Publication Date: 2012-12-21

Description: 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

Keywords: 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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Publication Date: 2012-12-21

Description: 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

Keywords: Electronic structure and strongly correlated systems

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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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Superradiant phase transition in a model of three-level-Λ systems interacting with two bosonic modes (2012)

Mathias Hayn, Clive Emary, and Tobias Brandes

American Physical Society (APS)

In: Physical Review A

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Publication Date: 2012-12-20

Description: Author(s): Mathias Hayn, Clive Emary, and Tobias Brandes We consider an ensemble of three-level particles in Lambda configuration interacting with two bosonic modes. The Hamiltonian has the form of a generalized Dicke model. We show that in the thermodynamic limit this model supports a superradiant quantum phase transition. Remarkably, this can be both a ... [Phys. Rev. A 86, 063822] Published Wed Dec 19, 2012

Keywords: Quantum optics, physics of lasers, nonlinear optics, classical optics

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Electronic ISSN: 1094-1622

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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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Publication Date: 2012-12-20

Description: 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

Keywords: Electronic structure and strongly correlated systems

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