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Thermodynamic and transport signatures of a fractionalized Fermi liquid (2011)

Andreas Hackl and Ronny Thomale

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-07

Description: Author(s): Andreas Hackl and Ronny Thomale Several heavy-fermion metals display a quantum phase transition from an antiferromagnetic metal to a heavy Fermi liquid. In some materials, however, recent experiments seem to find that the heavy Fermi liquid phase can be directly tuned into a non-Fermi liquid phase without apparent magnetic order. ... [Phys. Rev. B 83, 235107] Published Mon Jun 06, 2011

Keywords: Electronic structure and strongly correlated systems

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Nearly Flatbands with Nontrivial Topology (2011)

Kai Sun, Zhengcheng Gu, Hosho Katsura, and S. Das Sarma

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-07

Description: Author(s): Kai Sun, Zhengcheng Gu, Hosho Katsura, and S. Das Sarma We report the theoretical discovery of a class of 2D tight-binding models containing nearly flatbands with nonzero Chern numbers. In contrast with previous studies, where nonlocal hoppings are usually required, the Hamiltonians of our models only require short-range hopping and have the potential to... [Phys. Rev. Lett. 106, 236803] Published Mon Jun 06, 2011

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Weakly Coupled Pfaffian as a Type I Quantum Hall Liquid (2011)

S. A. Parameswaran, S. A. Kivelson, S. L. Sondhi, and B. Z. Spivak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-07

Description: Author(s): S. A. Parameswaran, S. A. Kivelson, S. L. Sondhi, and B. Z. Spivak The Pfaffian phase in the proximity of a half-filled Landau level is understood to be a p + i p superconductor of composite fermions. We consider the properties of this paired quantum Hall phase when the pairing energy is small, i.e., in the weak-coupling, BCS limit, where the coherence length is much ... [Phys. Rev. Lett. 106, 236801] Published Mon Jun 06, 2011

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Manifestly gauge-independent formulations of the Z_{2} invariants (2011)

Emil Prodan

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-09

Description: Author(s): Emil Prodan We use a “monodromy” argument to derive new expressions for the Z 2 invariants of topological insulators with time-reversal symmetry in two and three dimensions. The derivations and the final expressions do not require any gauge choice and the calculation of the invariants is based entirely on the pr... [Phys. Rev. B 83, 235115] Published Wed Jun 08, 2011

Keywords: Electronic structure and strongly correlated systems

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Finite-temperature phase diagram of the three-dimensional hard-core bosonic t-J model (2011)

Yuki Nakano, Takumi Ishima, Naohiro Kobayashi, Kazuhiko Sakakibara, Ikuo Ichinose, and Tetsuo Matsui

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-09

Description: Author(s): Yuki Nakano, Takumi Ishima, Naohiro Kobayashi, Kazuhiko Sakakibara, Ikuo Ichinose, and Tetsuo Matsui We study the three-dimensional bosonic t - J model, that is, the t - J model of “bosonic electrons” at finite temperatures. This model describes a system of an isotropic antiferromagnet with doped bosonic holes and is closely related to systems of two-component bosons in an optical lattice. The bosonic ... [Phys. Rev. B 83, 235116] Published Wed Jun 08, 2011

Keywords: Electronic structure and strongly correlated systems

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Exact energy of the spin-polarized two-dimensional electron gas at high density (2011)

Pierre-François Loos and Peter M. W. Gill

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-09

Description: Author(s): Pierre-François Loos and Peter M. W. Gill We derive the exact expansion, to O ( r s ) , of the energy of the high-density spin-polarized two-dimensional uniform electron gas, where r s is the Seitz radius. [Phys. Rev. B 83, 233102] Published Wed Jun 08, 2011

Keywords: Electronic structure and strongly correlated systems

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Two-Dimensional Magnetic and Superconducting Phases in Metal-Insulator La_{2-x}Sr_{x}CuO_{4} Superlattices Measured by Muon-Spin Rotation (2011)

A. Suter, E. Morenzoni, T. Prokscha, B. M. Wojek, H. Luetkens, G. Nieuwenhuys, A. Gozar, G. Logvenov, and I. Božović

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): A. Suter, E. Morenzoni, T. Prokscha, B. M. Wojek, H. Luetkens, G. Nieuwenhuys, A. Gozar, G. Logvenov, and I. Božović We show, by means of low-energy muon-spin rotation measurements, that few-unit-cells thick La 2 CuO 4 layers synthesized digitally by molecular beam epitaxy are antiferromagnetically ordered. Below a thickness of about 5 CuO 2 layers the long-range ordered state breaks down, and a magnetic state appears... [Phys. Rev. Lett. 106, 237003] Published Wed Jun 08, 2011

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Pressure-Stabilized Sodium Polyhydrides: NaH_{n} (n〉1) (2011)

Pio Baettig and Eva Zurek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): Pio Baettig and Eva Zurek Computations on NaH n , n =6–12 , show that NaH 9 is stable by P =25 GPa . Cmc2 1 -NaH 9 containing both H 2 and H - units is metallic at P 〉250 GPa . Other phases with only H 2 units metallize at lower pressures as a result of the partial filling of the H 2 σ u * bands by the Na 3 s electrons. Pressure induced o... [Phys. Rev. Lett. 106, 237002] Published Wed Jun 08, 2011

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Implementation of screened hybrid functionals based on the Yukawa potential within the LAPW basis set (2011)

Fabien Tran and Peter Blaha

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-10

Description: Author(s): Fabien Tran and Peter Blaha The implementation of screened hybrid functionals into the wien2k code, which is based on the linearized augmented plane wave (LAPW) basis set, is reported. The Hartree-Fock exchange energy and potential are screened by means of the Yukawa potential as proposed by Bylander and Kleinman [ D. M. Byland... [Phys. Rev. B 83, 235118] Published Thu Jun 09, 2011

Keywords: Electronic structure and strongly correlated systems

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Conductance of a Helical Edge Liquid Coupled to a Magnetic Impurity (2011)

Yoichi Tanaka, A. Furusaki, and K. A. Matveev

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-10

Description: Author(s): Yoichi Tanaka, A. Furusaki, and K. A. Matveev Transport in an ideal two-dimensional quantum spin Hall device is dominated by the counterpropagating edge states of electrons with opposite spins, giving the universal value of the conductance, 2 e 2 / h . We study the effect on the conductance of a magnetic impurity, which can backscatter an electron f... [Phys. Rev. Lett. 106, 236402] Published Thu Jun 09, 2011

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Quantum Walks with Non-Abelian Anyons (2011)

Lauri Lehman, Vaclav Zatloukal, Gavin K. Brennen, Jiannis K. Pachos, and Zhenghan Wang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Lauri Lehman, Vaclav Zatloukal, Gavin K. Brennen, Jiannis K. Pachos, and Zhenghan Wang We study the single particle dynamics of a mobile non-Abelian anyon hopping around many pinned anyons on a surface, by modeling it with a discrete time quantum walk. During the evolution, the spatial degree of freedom of the mobile anyon becomes entangled with the fusion degrees of freedom of the co... [Phys. Rev. Lett. 106, 230404] Published Fri Jun 10, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Sub-Poissonian Fluctuations in a 1D Bose Gas: From the Quantum Quasicondensate to the Strongly Interacting Regime (2011)

Thibaut Jacqmin, Julien Armijo, Tarik Berrada, Karen V. Kheruntsyan, and Isabelle Bouchoule

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Thibaut Jacqmin, Julien Armijo, Tarik Berrada, Karen V. Kheruntsyan, and Isabelle Bouchoule We report on local, in situ measurements of atom number fluctuations in slices of a one-dimensional Bose gas on an atom chip setup. By using current modulation techniques to prevent cloud fragmentation, we are able to probe the crossover from weak to strong interactions. For weak interactions, fluct... [Phys. Rev. Lett. 106, 230405] Published Fri Jun 10, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Quasihole condensates in quantum Hall liquids (2011)

J. Suorsa, S. Viefers, and T. H. Hansson

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-17

Description: Author(s): J. Suorsa, S. Viefers, and T. H. Hansson We develop a formalism to describe quasihole condensates in quantum Hall liquids and thereby extend the conformal field theory approach to the full hierarchy of spin-polarized Abelian states and to several classes of non-Abelian hierarchical states. Most previously proposed spin-polarized quantum Ha... [Phys. Rev. B 83, 235130] Published Thu Jun 16, 2011

Keywords: Electronic structure and strongly correlated systems

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Magnetostructural Transitions in a Frustrated Magnet at High Fields (2011)

V. Tsurkan, S. Zherlitsyn, V. Felea, S. Yasin, Yu. Skourski, J. Deisenhofer, H.-A. Krug von Nidda, P. Lemmens, J. Wosnitza, and A. Loidl

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-17

Description: Author(s): V. Tsurkan, S. Zherlitsyn, V. Felea, S. Yasin, Yu. Skourski, J. Deisenhofer, H.-A. Krug von Nidda, P. Lemmens, J. Wosnitza, and A. Loidl Ultrasound and magnetization studies of bond-frustrated ZnCr 2 S 4 spinel are performed in static magnetic fields up to 18 T and in pulsed fields up to 62 T. At temperatures below the antiferromagnetic transition at T N 1 ≈14 K , the sound velocity as a function of the magnetic field reveals a sequence of... [Phys. Rev. Lett. 106, 247202] Published Thu Jun 16, 2011

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Doping dependence of thermoelectric performance in Mo_{3}Sb_{7}: First-principles calculations (2011)

David Parker, Mao-Hua Du, and David J. Singh

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-21

Description: Author(s): David Parker, Mao-Hua Du, and David J. Singh We study the effects of doping Mo 3 Sb 7 with transition metals (Ni, Fe, Co, Ru) via first-principles calculations, including electronic structure, lattice dynamics, and Boltzmann transport. We find heavy-mass bands and large, rapidly varying density of states, generally favorable for high thermopower,... [Phys. Rev. B 83, 245111] Published Mon Jun 20, 2011

Keywords: Electronic structure and strongly correlated systems

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Theory of High-Temperature Multiferroicity in Cupric Oxide (2011)

Pierre Tolédano, Naëmi Leo, Dmitry D. Khalyavin, Laurent C. Chapon, Tim Hoffmann, Dennis Meier, and Manfred Fiebig

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Pierre Tolédano, Naëmi Leo, Dmitry D. Khalyavin, Laurent C. Chapon, Tim Hoffmann, Dennis Meier, and Manfred Fiebig The incommensurate-commensurate phases reported in cupric oxide below 230 K are shown theoretically to realize an inverted sequence of symmetry-breaking mechanisms with respect to the usual sequence occurring in low-temperature multiferroic compounds. The sequence inversion results from a strong tri... [Phys. Rev. Lett. 106, 257601] Published Mon Jun 20, 2011

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Crystal structure and electronic states of tripotassium picene (2011)

P. L. de Andres, A. Guijarro, and J. A. Vergés

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-22

Description: Author(s): P. L. de Andres, A. Guijarro, and J. A. Vergés The crystal structure of potassium-doped picene with an exact stoichiometry (K 3 C 22 H 14 , K 3 picene from here onwards) has been theoretically determined within density functional theory allowing complete variational freedom of the crystal structure parameters and the molecular atomic positions. A modifi... [Phys. Rev. B 83, 245113] Published Tue Jun 21, 2011

Keywords: Electronic structure and strongly correlated systems

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Electronic structure of a narrow-gap semiconductor FeGa_{3} investigated by photoemission and inverse photoemission spectroscopies (2011)

M. Arita, K. Shimada, Y. Utsumi, O. Morimoto, H. Sato, H. Namatame, M. Taniguchi, Y. Hadano, and T. Takabatake

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-23

Description: Author(s): M. Arita, K. Shimada, Y. Utsumi, O. Morimoto, H. Sato, H. Namatame, M. Taniguchi, Y. Hadano, and T. Takabatake We have performed a photoemission and inverse photoemission spectroscopic study of a narrow-gap semiconductor FeGa 3 , in order to characterize the occupied and unoccupied electronic states. The energy-gap size was found to be ~0.4 eV, and the valence-band maximum (VBM) was located around the A point ... [Phys. Rev. B 83, 245116] Published Wed Jun 22, 2011

Keywords: Electronic structure and strongly correlated systems

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Quantum Receiver beyond the Standard Quantum Limit of Coherent Optical Communication (2011)

Kenji Tsujino, Daiji Fukuda, Go Fujii, Shuichiro Inoue, Mikio Fujiwara, Masahiro Takeoka, and Masahide Sasaki

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Kenji Tsujino, Daiji Fukuda, Go Fujii, Shuichiro Inoue, Mikio Fujiwara, Masahiro Takeoka, and Masahide Sasaki The most efficient modern optical communication is known as coherent communication, and its standard quantum limit is almost reachable with current technology. Though it has been predicted for a long time that this standard quantum limit could be overcome via quantum mechanically optimized receivers... [Phys. Rev. Lett. 106, 250503] Published Fri Jun 24, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Extremal Quantum Correlations and Cryptographic Security (2011)

T. Franz, F. Furrer, and R. F. Werner

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): T. Franz, F. Furrer, and R. F. Werner We investigate a fundamental property of device-independent security in quantum cryptography by characterizing probability distributions which are necessarily independent of the measurement results of any eavesdropper. We show that probability distributions that are secure in this sense are exactly ... [Phys. Rev. Lett. 106, 250502] Published Fri Jun 24, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Subspace representations in ab initio methods for strongly correlated systems (2011)

David D. O’Regan, Mike C. Payne, and Arash A. Mostofi

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-28

Description: Author(s): David D. O’Regan, Mike C. Payne, and Arash A. Mostofi We present a generalized definition of subspace occupancy matrices in ab initio methods for strongly correlated materials, such as DFT + U (density functional theory + Hubbard U ) and DFT + DMFT (dynamical mean-field theory), which is appropriate to the case of nonorthogonal projector functions. By enfor... [Phys. Rev. B 83, 245124] Published Mon Jun 27, 2011

Keywords: Electronic structure and strongly correlated systems

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Buckling-induced Zener polaron instability in half-doped manganites (2011)

Paolo Barone, Silvia Picozzi, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-28

Description: Author(s): Paolo Barone, Silvia Picozzi, and Jeroen van den Brink By calculating the electronic, orbital, magnetic, and lattice structure of half-doped manganites we establish the central role of oxygen buckling caused by the tilting of the MnO 6 octahedra, which is, in essence, a steric effect. The buckling itself does not change the Mn-Mn bonds. Instead, it drive... [Phys. Rev. B 83, 233103] Published Mon Jun 27, 2011

Keywords: Electronic structure and strongly correlated systems

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Metal-insulator transition in layered nickelates La_{3}Ni_{2}O_{7-δ} (δ = 0.0, 0.5, 1) (2011)

Victor Pardo and Warren E. Pickett

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-28

Description: Author(s): Victor Pardo and Warren E. Pickett Three low-valence layered nickelates with general formula La 3 Ni 2 O 7- δ ( δ = 0.0, 0.5, 1) are studied by ab initio techniques. Both the insulating and the metallic limits are analyzed, together with the compound at the Mott transition ( δ = 0.5; Ni 2+ ), that shows insulating behavior, with all Ni atoms i... [Phys. Rev. B 83, 245128] Published Mon Jun 27, 2011

Keywords: Electronic structure and strongly correlated systems

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Full vectorial analysis of Brillouin gain in random acoustically microstructured photonic crystal fibers (2011)

Chad G. Carlson, R. Brendan Ross, Jessica M. Schafer, Justin B. Spring, and Benjamin G. Ward

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-08

Description: Author(s): Chad G. Carlson, R. Brendan Ross, Jessica M. Schafer, Justin B. Spring, and Benjamin G. Ward We report on the fully vectorial numerical investigation of Brillouin gain in large-mode-area random acoustically microstructured photonic crystal fibers. We treated the fiber core as a linear isotropic elastic medium, resulting in an energy functional that we minimized to obtain the heterogeneous, ... [Phys. Rev. B 83, 235110] Published Tue Jun 07, 2011

Keywords: Electronic structure and strongly correlated systems

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Impurity spin texture at the critical point between Néel-ordered and valence-bond-solid states in two-dimensional SU(3) quantum antiferromagnets (2011)

Argha Banerjee, Kedar Damle, and Fabien Alet

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-08

Description: Author(s): Argha Banerjee, Kedar Damle, and Fabien Alet We study the impurity physics at a continuous quantum phase transition from an SU(3) symmetric Néel-ordered state to a valence-bond-solid state that breaks lattice symmetries, using quantum Monte Carlo techniques. This continuous transition is expected to be an example of “deconfined criticality” in... [Phys. Rev. B 83, 235111] Published Tue Jun 07, 2011

Keywords: Electronic structure and strongly correlated systems

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Band alignment at metal/ferroelectric interfaces: Insights and artifacts from first principles (2011)

Massimiliano Stengel, Pablo Aguado-Puente, Nicola A. Spaldin, and Javier Junquera

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-08

Description: Author(s): Massimiliano Stengel, Pablo Aguado-Puente, Nicola A. Spaldin, and Javier Junquera Based on recent advances in first-principles theory, we develop a general model of the band offset at metal/ferroelectric interfaces. We show that, depending on the polarization of the film, a pathological regime might occur where the metallic carriers populate the energy bands of the insulator, mak... [Phys. Rev. B 83, 235112] Published Tue Jun 07, 2011

Keywords: Electronic structure and strongly correlated systems

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Spectral properties of the three-dimensional Hubbard model (2011)

Sebastian Fuchs, Emanuel Gull, Matthias Troyer, Mark Jarrell, and Thomas Pruschke

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-08

Description: Author(s): Sebastian Fuchs, Emanuel Gull, Matthias Troyer, Mark Jarrell, and Thomas Pruschke We present momentum-resolved single-particle spectra for the three-dimensional Hubbard model for the paramagnetic and antiferromagnetically ordered phase obtained within the dynamical cluster approximation. The effective cluster problem is solved by continuous-time quantum Monte Carlo simulations. T... [Phys. Rev. B 83, 235113] Published Tue Jun 07, 2011

Keywords: Electronic structure and strongly correlated systems

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Effect of Jahn-Teller distortion on magnetic ordering in Dy(Fe,Mn)O_{3} perovskites (2011)

F.-K. Chiang, M.-W. Chu, F. C. Chou, H. T. Jeng, H. S. Sheu, F. R. Chen, and C. H. Chen

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-07

Description: Author(s): F.-K. Chiang, M.-W. Chu, F. C. Chou, H. T. Jeng, H. S. Sheu, F. R. Chen, and C. H. Chen The structural, magnetic properties of the rare-earth perovskites, DyFe 1- x Mn x O 3 (space group, orthorhombic Pbnm ), were studied, and the magnetic phase diagram of the solid solution was investigated, which unveiled an unexplored hidden field-induced weak ferromagnetism in the material system with x = ... [Phys. Rev. B 83, 245105] Published Mon Jun 06, 2011

Keywords: Electronic structure and strongly correlated systems

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Band structure and Fermi surface of URu_{2}Si_{2} studied by soft x-ray angle-resolved photoemission spectroscopy (2011)

Ikuto Kawasaki, Shin-ichi Fujimori, Yukiharu Takeda, Tetsuo Okane, Akira Yasui, Yuji Saitoh, Hiroshi Yamagami, Yoshinori Haga, Etsuji Yamamoto, and Yoshichika Ōnuki

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-11

Description: Author(s): Ikuto Kawasaki, Shin-ichi Fujimori, Yukiharu Takeda, Tetsuo Okane, Akira Yasui, Yuji Saitoh, Hiroshi Yamagami, Yoshinori Haga, Etsuji Yamamoto, and Yoshichika Ōnuki We have performed angle-resolved photoelectron spectroscopy experiments in the soft x-ray region in order to clarify the band structure and Fermi surfaces (FSs) of URu 2 Si 2 . In the vicinity of the Fermi level, U 5 f –derived quasiparticle bands were clearly observed. They form a small and a large hole ... [Phys. Rev. B 83, 235121] Published Fri Jun 10, 2011

Keywords: Electronic structure and strongly correlated systems

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Spin-Polarized Scanning-Tunneling Probe for Helical Luttinger Liquids (2011)

Sourin Das and Sumathi Rao

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Sourin Das and Sumathi Rao We propose a three-terminal spin-polarized STM setup for probing the helical nature of the Luttinger liquid edge state that appears in the quantum spin Hall system. We show that the three-terminal tunneling conductance depends on the angle ( θ ) between the magnetization direction of the tip and the l... [Phys. Rev. Lett. 106, 236403] Published Fri Jun 10, 2011

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BiFeO_{3} Films under Tensile Epitaxial Strain from First Principles (2011)

B. Dupé, S. Prosandeev, G. Geneste, B. Dkhil, and L. Bellaiche

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): B. Dupé, S. Prosandeev, G. Geneste, B. Dkhil, and L. Bellaiche Density-functional calculations are performed to predict structural and magnetic properties of (001) BiFeO 3 films under tensile epitaxial strain. These films remain monoclinic ( C c space group) for misfit strains between 0% and ≈8% , with the polarization, tilt axis and magnetization all rotating when... [Phys. Rev. Lett. 106, 237601] Published Fri Jun 10, 2011

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Anomalous Spin-Resolved Point-Contact Transmission of Holes due to Cubic Rashba Spin-Orbit Coupling (2011)

Stefano Chesi, Gabriele F. Giuliani, L. P. Rokhinson, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Stefano Chesi, Gabriele F. Giuliani, L. P. Rokhinson, L. N. Pfeiffer, and K. W. West Evidence is presented for the finite wave vector crossing of the two lowest one-dimensional spin-split subbands in quantum point contacts fabricated from two-dimensional hole gases with strong spin-orbit interaction. This phenomenon offers an elegant explanation for the anomalous sign of the spin po... [Phys. Rev. Lett. 106, 236601] Published Fri Jun 10, 2011

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Preformed Excitonic Liquid Route to a Charge Density Wave in 2H-TaSe_{2} (2011)

A. Taraphder, S. Koley, N. S. Vidhyadhiraja, and M. S. Laad

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): A. Taraphder, S. Koley, N. S. Vidhyadhiraja, and M. S. Laad Recent experiments on 2H-TaSe 2 contradict the long-held view of the charge density wave arising from a nested band structure. An intrinsically strong coupling view, involving a charge density wave state arising as a Bose condensation of preformed excitons emerges as an attractive, albeit scantily in... [Phys. Rev. Lett. 106, 236405] Published Fri Jun 10, 2011

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Entangled Inputs Cannot Make Imperfect Quantum Channels Perfect (2011)

F. G. S. L. Brandão, J. Eisert, M. Horodecki, and D. Yang

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): F. G. S. L. Brandão, J. Eisert, M. Horodecki, and D. Yang Entangled inputs can enhance the capacity of quantum channels, this being one of the consequences of the celebrated result showing the nonadditivity of several quantities relevant for quantum information science. In this work, we answer the converse question (whether entangled inputs can ever render... [Phys. Rev. Lett. 106, 230502] Published Fri Jun 10, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Exciton Transport and Andreev Reflection in a Bilayer Quantum Hall System (2011)

A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): A. D. K. Finck, J. P. Eisenstein, L. N. Pfeiffer, and K. W. West We demonstrate that counterflowing electrical currents can move through the bulk of the excitonic quantized Hall phase found in bilayer two-dimensional electron systems (2DES) even as charged excitations cannot. These counterflowing currents are transported by neutral excitons which are emitted and ... [Phys. Rev. Lett. 106, 236807] Published Fri Jun 10, 2011

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Electronic Structure via Potential Functional Approximations (2011)

Attila Cangi, Donghyung Lee, Peter Elliott, Kieron Burke, and E. K. U. Gross

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-11

Description: Author(s): Attila Cangi, Donghyung Lee, Peter Elliott, Kieron Burke, and E. K. U. Gross The universal functional of Hohenberg-Kohn is given as a coupling-constant integral over the density as a functional of the potential. Conditions are derived under which potential -functional approximations are variational. Construction via this method and imposition of these conditions are shown to ... [Phys. Rev. Lett. 106, 236404] Published Fri Jun 10, 2011

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Slave-boson field fluctuation approach to the extended Falicov-Kimball model: Charge, orbital, and excitonic susceptibilities (2011)

B. Zenker, D. Ihle, F. X. Bronold, and H. Fehske

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-14

Description: Author(s): B. Zenker, D. Ihle, F. X. Bronold, and H. Fehske Based on the SO(2) -invariant slave-boson scheme, the static charge, orbital, and excitonic susceptibilities in the extended Falicov–Kimball model are calculated. Analyzing the phase without long-range order, we find instabilities toward charge order, orbital order, and the excitonic insulator (EI) p... [Phys. Rev. B 83, 235123] Published Mon Jun 13, 2011

Keywords: Electronic structure and strongly correlated systems

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Antiferromagnet topological insulators with AB_{2}C Heusler structure (2011)

C. Li, J. S. Lian, and Q. Jiang

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-14

Description: Author(s): C. Li, J. S. Lian, and Q. Jiang The band structures, partial density of states, and electronic configuration of several AB 2 C full-Heusler compounds have been simulated using local-density approximation (LDA) + U . Results show that full-Heusler compounds with half-filled d orbitals and d 5 d 5 s 2 p 6 electronic structures can also form top... [Phys. Rev. B 83, 235125] Published Mon Jun 13, 2011

Keywords: Electronic structure and strongly correlated systems

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Anomalous Meissner Effect in a Normal-Metal–Superconductor Junction with a Spin-Active Interface (2011)

Takehito Yokoyama, Yukio Tanaka, and Naoto Nagaosa

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-14

Description: Author(s): Takehito Yokoyama, Yukio Tanaka, and Naoto Nagaosa We investigate Meissner effect in normal-metal–superconductor junctions where the interface is spin active. We find that orbital magnetic susceptibility of the normal metal shows highly nontrivial behavior. In particular, the magnetic susceptibility depends on the temperature in an oscillatory fashi... [Phys. Rev. Lett. 106, 246601] Published Mon Jun 13, 2011

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Measurement of Electron-Hole Friction in an n-Doped GaAs/AlGaAs Quantum Well Using Optical Transient Grating Spectroscopy (2011)

Luyi Yang, J. D. Koralek, J. Orenstein, D. R. Tibbetts, J. L. Reno, and M. P. Lilly

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-14

Description: Author(s): Luyi Yang, J. D. Koralek, J. Orenstein, D. R. Tibbetts, J. L. Reno, and M. P. Lilly We use phase-resolved transient grating spectroscopy to measure the drift and diffusion of electron-hole density waves in a semiconductor quantum well. The unique aspects of this optical probe allow us to determine the frictional force between a two-dimensional Fermi liquid of electrons and a dilute... [Phys. Rev. Lett. 106, 247401] Published Mon Jun 13, 2011

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Robust Dynamical Decoupling for Quantum Computing and Quantum Memory (2011)

Alexandre M. Souza, Gonzalo A. Álvarez, and Dieter Suter

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Alexandre M. Souza, Gonzalo A. Álvarez, and Dieter Suter Dynamical decoupling (DD) is a popular technique for protecting qubits from the environment. However, unless special care is taken, experimental errors in the control pulses used in this technique can destroy the quantum information instead of preserving it. Here, we investigate techniques for makin... [Phys. Rev. Lett. 106, 240501] Published Tue Jun 14, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Optical excitation of electron glasses (2011)

Z. Ovadyahu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-15

Description: Author(s): Z. Ovadyahu Electron glasses can be readily driven far from equilibrium by a variety of means. Several mechanisms to excite the system and their relative merits are reviewed. In this paper, we focus on the process of exciting electron glasses by interaction with near-infrared radiation. The efficiency of this p... [Phys. Rev. B 83, 235126] Published Tue Jun 14, 2011

Keywords: Electronic structure and strongly correlated systems

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Role of band structure in the thermodynamic properties of itinerant metamagnets (2011)

A. M. Berridge

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-15

Description: Author(s): A. M. Berridge It is known that itinerant metamagnetic transitions can be driven by features in the electronic density of states. We study the signatures of these transitions in the entropy and specific heat for a variety of different cases, identifying the key features which differ from naive expectations, such a... [Phys. Rev. B 83, 235127] Published Tue Jun 14, 2011

Keywords: Electronic structure and strongly correlated systems

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Nonlinear mesoscopic transport in a strongly cooperative electron system: The La_{0.67}Ca_{0.33}MnO_{3} microbridge (2011)

C. Beekman, J. Zaanen, and J. Aarts

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-15

Description: Author(s): C. Beekman, J. Zaanen, and J. Aarts We investigate the electrical transport in mesoscopic structures of La 0.7 Ca 0.3 MnO 3 in the regime of the metal-insulator transition by fabricating microbridges from strained and unstrained thin films. We measure current-voltage characteristics as function of temperature and in high magnetic fields. F... [Phys. Rev. B 83, 235128] Published Tue Jun 14, 2011

Keywords: Electronic structure and strongly correlated systems

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Structured Optical Receivers to Attain Superadditive Capacity and the Holevo Limit (2011)

Saikat Guha

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Saikat Guha Attaining the ultimate (Holevo) limit to the classical capacity of a quantum channel requires the receiver to make joint measurements over long code-word blocks. For a pure-state channel, we show that the Holevo limit can be attained by a receiver that uses a multisymbol unitary transformation on th... [Phys. Rev. Lett. 106, 240502] Published Tue Jun 14, 2011

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Magnetic Bond-Order Potential for Iron (2011)

M. Mrovec, D. Nguyen-Manh, C. Elsässer, and P. Gumbsch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): M. Mrovec, D. Nguyen-Manh, C. Elsässer, and P. Gumbsch We present a magnetic bond-order potential (BOP) that is able to provide a correct description of both directional covalent bonds and magnetic interactions in iron. This potential, based on the tight binding approximation and the Stoner model of itinerant magnetism, forms a direct bridge between the... [Phys. Rev. Lett. 106, 246402] Published Tue Jun 14, 2011

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Electron Localization in Defective Ceria Films: A Study with Scanning-Tunneling Microscopy and Density-Functional Theory (2011)

Jan-Frederik Jerratsch, Xiang Shao, Niklas Nilius, Hans-Joachim Freund, Cristina Popa, M. Veronica Ganduglia-Pirovano, Asbjörn M. Burow, and Joachim Sauer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Jan-Frederik Jerratsch, Xiang Shao, Niklas Nilius, Hans-Joachim Freund, Cristina Popa, M. Veronica Ganduglia-Pirovano, Asbjörn M. Burow, and Joachim Sauer Scanning-tunneling microscopy and density-functional theory have been employed to identify the spatial correlation between an oxygen vacancy and the associated Ce 3+ ion pair in a defective CeO 2 (111) film. The two Ce 3+ ions can occupy different cationic shells around the vacancy. The resulting variat... [Phys. Rev. Lett. 106, 246801] Published Tue Jun 14, 2011

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Swift Loss of Coherence of Soliton Trains in Attractive Bose-Einstein Condensates (2011)

Alexej I. Streltsov, Ofir E. Alon, and Lorenz S. Cederbaum

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-15

Description: Author(s): Alexej I. Streltsov, Ofir E. Alon, and Lorenz S. Cederbaum Experiments on ultracold attractive Bose-Einstein condensates (BECs) have demonstrated that at low dimensions atomic clouds can form localized objects, propagating for long times without significant changes in their shapes and attributed to bright matter-wave solitons, which are coherent objects. We... [Phys. Rev. Lett. 106, 240401] Published Tue Jun 14, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Suppression of localization in a two-leg ladder model with correlated binary disorder (2011)

Ai-Min Guo and Shi-Jie Xiong

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-18

Description: Author(s): Ai-Min Guo and Shi-Jie Xiong We investigate the electronic properties of a two-leg ladder model by taking into account the combined effects of long-range correlations along the longitudinal direction and short-range correlations in the transverse direction. The strength of both correlations is measured by the correlation expone... [Phys. Rev. B 83, 245108] Published Fri Jun 17, 2011

Keywords: Electronic structure and strongly correlated systems

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Spectral, optical, and transport properties of the adiabatic anisotropic Holstein model: Application to slightly doped organic semiconductors (2011)

C. A. Perroni, A. Nocera, V. Marigliano Ramaglia, and V. Cataudella

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-18

Description: Author(s): C. A. Perroni, A. Nocera, V. Marigliano Ramaglia, and V. Cataudella Spectral, optical, and transport properties of an anisotropic three-dimensional Holstein model are studied within the adiabatic approximation. The parameter regime is appropriate for organic semiconductors used in single-crystal-based field-effect transistors. Different approaches have been used to ... [Phys. Rev. B 83, 245107] Published Fri Jun 17, 2011

Keywords: Electronic structure and strongly correlated systems

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Magnetic-field-induced quantum phase transitions in the two-impurity Anderson model (2011)

Lijun Zhu and Jian-Xin Zhu

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-21

Description: Author(s): Lijun Zhu and Jian-Xin Zhu In the two-impurity Anderson model, the interimpurity spin-exchange interaction favors a spin-singlet state between two impurities, leading to the breakdown of the Kondo effect. We show that a local uniform magnetic field can delocalize the quasiparticles to restore the Kondo resonance. This transit... [Phys. Rev. B 83, 245110] Published Mon Jun 20, 2011

Keywords: Electronic structure and strongly correlated systems

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Hao Wang and V. W. Scarola

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-21

Description: Author(s): Hao Wang and V. W. Scarola The electronic band structure of many compounds, e.g., carbon-based structures, can exhibit essentially no dispersion. Models of electrons in flat-band lattices define nonperturbative strongly correlated problems by default. We construct a set of Jastrow-correlated ansatz wavefunctions to capture th... [Phys. Rev. B 83, 245109] Published Mon Jun 20, 2011

Keywords: Electronic structure and strongly correlated systems

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Model Independence in Two Dimensions and Polarized Cold Dipolar Molecules (2011)

A. G. Volosniev, D. V. Fedorov, A. S. Jensen, and N. T. Zinner

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): A. G. Volosniev, D. V. Fedorov, A. S. Jensen, and N. T. Zinner We calculate the energy and wave functions of two particles confined to two spatial dimensions interacting via arbitrary anisotropic potentials with negative or zero net volume. The general rigorous analytic expressions are given in the weak coupling limit where universality or model independence ar... [Phys. Rev. Lett. 106, 250401] Published Mon Jun 20, 2011

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Sequential Projective Measurements for Channel Decoding (2011)

Seth Lloyd, Vittorio Giovannetti, and Lorenzo Maccone

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Seth Lloyd, Vittorio Giovannetti, and Lorenzo Maccone We study the transmission of classical information in quantum channels. We present a decoding procedure that is very simple but still achieves the channel capacity. It is used to give an alternative straightforward proof that the classical capacity is given by the regularized Holevo bound. This proc... [Phys. Rev. Lett. 106, 250501] Published Mon Jun 20, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Ground-state properties of the one-dimensional electron liquid (2011)

R. M. Lee and N. D. Drummond

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-23

Description: Author(s): R. M. Lee and N. D. Drummond We present calculations of the energy, pair-correlation function (PCF), static structure factor (SSF), and momentum density (MD) for the one-dimensional electron gas using the quantum Monte Carlo method. We are able to resolve peaks in the SSF at even-integer multiples of the Fermi wave vector, whic... [Phys. Rev. B 83, 245114] Published Wed Jun 22, 2011

Keywords: Electronic structure and strongly correlated systems

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Resolved Atomic Interaction Sidebands in an Optical Clock Transition (2011)

M. Bishof, Y. Lin, M. D. Swallows, A. V. Gorshkov, J. Ye, and A. M. Rey

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): M. Bishof, Y. Lin, M. D. Swallows, A. V. Gorshkov, J. Ye, and A. M. Rey We report the observation of resolved atomic interaction sidebands (ISB) in the 87 Sr optical clock transition when atoms at microkelvin temperatures are confined in a two-dimensional optical lattice. The ISB are a manifestation of the strong interactions that occur between atoms confined in a quasi-... [Phys. Rev. Lett. 106, 250801] Published Wed Jun 22, 2011

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Thermoelectric evidence for high-field anomalies in the hidden order phase of URu_{2}Si_{2} (2011)

Liam Malone, Tatsuma D. Matusda, Arlei Antunes, Georg Knebel, Valentin Taufour, Dai Aoki, Kamran Behnia, Cyril Proust, and Jacques Flouquet

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-23

Description: Author(s): Liam Malone, Tatsuma D. Matusda, Arlei Antunes, Georg Knebel, Valentin Taufour, Dai Aoki, Kamran Behnia, Cyril Proust, and Jacques Flouquet Measurements of the thermoelectric coefficients of URu 2 Si 2 in a high magnetic field could imply topological Fermi surface changes even deep inside the hidden order state. A change is observed in the thermopower as a function of the field applied parallel to the easy axis of magnetization, which coul... [Phys. Rev. B 83, 245117] Published Wed Jun 22, 2011

Keywords: Electronic structure and strongly correlated systems

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Determining topological order from a local ground-state correlation function (2011)

Zohar Ringel and Yaacov E. Kraus

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-23

Description: Author(s): Zohar Ringel and Yaacov E. Kraus Topological insulators are physically distinguishable from normal insulators only near edges and defects, while in the bulk there is no clear signature to their topological order. In this work we show that the Z 2 index of topological insulators and the Z index of the integer quantum Hall effect mani... [Phys. Rev. B 83, 245115] Published Wed Jun 22, 2011

Keywords: Electronic structure and strongly correlated systems

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Magnetic fluctuations and self-energy effects in two-dimensional itinerant systems with a van Hove singularity in the electronic spectrum (2011)

P. A. Igoshev, V. Yu. Irkhin, and A. A. Katanin

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-23

Description: Author(s): P. A. Igoshev, V. Yu. Irkhin, and A. A. Katanin We investigate a competition of tendencies toward ferromagnetic and incommensurate order in two-dimensional fermionic systems within functional renormalization-group technique, accounting for the self-energy corrections and using temperature as a scale parameter. We assume that the Fermi surface (FS... [Phys. Rev. B 83, 245118] Published Wed Jun 22, 2011

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Entanglement Symmetry, Amplitudes, and Probabilities: Inverting Born’s Rule (2011)

Wojciech H. Zurek

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): Wojciech H. Zurek Symmetry of entangled states under a swap of outcomes (“envariance”) implies their equiprobability and leads to Born’s rule p k =| ψ k | 2 . Here I show the converse: I demonstrate that the amplitude of a state given by a superposition of sequences of events that share the same total count (e.g., n detecti... [Phys. Rev. Lett. 106, 250402] Published Wed Jun 22, 2011

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Electronic Structure of the Topological Insulator Bi_{2}Se_{3} Using Angle-Resolved Photoemission Spectroscopy: Evidence for a Nearly Full Surface Spin Polarization (2011)

Z.-H. Pan, E. Vescovo, A. V. Fedorov, D. Gardner, Y. S. Lee, S. Chu, G. D. Gu, and T. Valla

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): Z.-H. Pan, E. Vescovo, A. V. Fedorov, D. Gardner, Y. S. Lee, S. Chu, G. D. Gu, and T. Valla We performed high-resolution spin- and angle-resolved photoemission spectroscopy studies of the electronic structure and the spin texture on the surface of Bi 2 Se 3 , a model TI. By tuning the photon energy, we found that the topological surface state is well separated from the bulk states in the vicin... [Phys. Rev. Lett. 106, 257004] Published Wed Jun 22, 2011

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Localization Properties of Random-Mass Dirac Fermions from Real-Space Renormalization Group (2011)

V. V. Mkhitaryan and M. E. Raikh

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): V. V. Mkhitaryan and M. E. Raikh Localization properties of random-mass Dirac fermions for a realization of mass disorder, commonly referred to as the Cho-Fisher model, are studied on the D -class chiral network. We show that a simple renormalization group (RG) description captures accurately a rich phase diagram: thermal metal and ... [Phys. Rev. Lett. 106, 256803] Published Wed Jun 22, 2011

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Scattering properties of meta-atoms (2011)

C. Rockstuhl, C. Menzel, S. Mühlig, J. Petschulat, C. Helgert, C. Etrich, A. Chipouline, T. Pertsch, and F. Lederer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-24

Description: Author(s): C. Rockstuhl, C. Menzel, S. Mühlig, J. Petschulat, C. Helgert, C. Etrich, A. Chipouline, T. Pertsch, and F. Lederer Metamaterials consist of a periodic or aperiodic arrangement of so-called meta-atoms. Usually their optical properties are derived from the collective response of this ensemble. However, it is highly desirable to deduce them from the scattering properties of individual meta-atoms because frequently ... [Phys. Rev. B 83, 245119] Published Thu Jun 23, 2011

Keywords: Electronic structure and strongly correlated systems

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Device-Independent Witnesses of Genuine Multipartite Entanglement (2011)

Jean-Daniel Bancal, Nicolas Gisin, Yeong-Cherng Liang, and Stefano Pironio

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Jean-Daniel Bancal, Nicolas Gisin, Yeong-Cherng Liang, and Stefano Pironio We consider the problem of determining whether genuine multipartite entanglement was produced in an experiment, without relying on a characterization of the systems observed or of the measurements performed. We present an n -partite inequality that is satisfied by all correlations produced by measure... [Phys. Rev. Lett. 106, 250404] Published Fri Jun 24, 2011

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Interacting Fermionic Atoms in Optical Lattices Diffuse Symmetrically Upwards and Downwards in a Gravitational Potential (2011)

Stephan Mandt, Akos Rapp, and Achim Rosch

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Stephan Mandt, Akos Rapp, and Achim Rosch We consider a cloud of fermionic atoms in an optical lattice described by a Hubbard model with an additional linear potential. While homogeneous interacting systems mainly show damped Bloch oscillations and heating, a finite cloud behaves differently: It expands symmetrically such that gains of pote... [Phys. Rev. Lett. 106, 250602] Published Fri Jun 24, 2011

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Hydrodynamic Description of Transport in Strongly Correlated Electron Systems (2011)

A. V. Andreev, Steven A. Kivelson, and B. Spivak

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): A. V. Andreev, Steven A. Kivelson, and B. Spivak We develop a hydrodynamic description of the resistivity and magnetoresistance of an electron liquid in a smooth disorder potential. This approach is valid when the electron-electron scattering length is sufficiently short. In a broad range of temperatures, the dissipation is dominated by heat fluxe... [Phys. Rev. Lett. 106, 256804] Published Fri Jun 24, 2011

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Production of Nonlocal Quartets and Phase-Sensitive Entanglement in a Superconducting Beam Splitter (2011)

Axel Freyn, Benoit Douçot, Denis Feinberg, and Régis Mélin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Axel Freyn, Benoit Douçot, Denis Feinberg, and Régis Mélin Three BCS superconductors S a , S b , and S and two short normal regions N a and N b in a three-terminal S a N a S N b S b setup provide a source of nonlocal quartets spatially separated as two correlated pairs in S a and S b , if the distance between the interfaces N a S and S N b is comparable to the coherence length ... [Phys. Rev. Lett. 106, 257005] Published Fri Jun 24, 2011

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Local-field effect on the spontaneous radiative emission rate (2011)

Chang-Kui Duan, Hongli Wen, and Peter A. Tanner

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-25

Description: Author(s): Chang-Kui Duan, Hongli Wen, and Peter A. Tanner The effect of the dielectric medium upon the spontaneous emission rate was investigated using lead borate glass of various compositions lightly doped with the Eu 3+ lanthanide ion. A dual approach used the variation of (i) electric dipole/magnetic dipole (ED/MD) emission rates from spectral integrati... [Phys. Rev. B 83, 245123] Published Fri Jun 24, 2011

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Doping dependence of magnetic excitations of one-dimensional cuprates as probed by resonant inelastic x-ray scattering (2011)

Filomena Forte, Mario Cuoco, Canio Noce, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-29

Description: Author(s): Filomena Forte, Mario Cuoco, Canio Noce, and Jeroen van den Brink We study the dynamical, momentum-dependent two- and four-spin response functions in doped and undoped one-dimensional cuprates, as probed by resonant inelastic x-ray scattering, using an exact numerical diagonalization procedure. In the undoped t – J system, the four-spin response vanishes at π , where... [Phys. Rev. B 83, 245133] Published Tue Jun 28, 2011

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Magnetic excitations in one-dimensional spin-orbital models (2011)

Alexander Herzog, Peter Horsch, Andrzej M. Oleś, and Jesko Sirker

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-29

Description: Author(s): Alexander Herzog, Peter Horsch, Andrzej M. Oleś, and Jesko Sirker We study the dynamics and thermodynamics of one-dimensional spin-orbital models relevant for transition-metal oxides. We show that collective spin, orbital, and combined spin-orbital excitations with infinite lifetime can exist, if the ground state of both sectors is ferromagnetic. Our main focus is... [Phys. Rev. B 83, 245130] Published Tue Jun 28, 2011

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SU(2)-invariant spin liquids on the triangular lattice with spinful Majorana excitations (2011)

Rudro R. Biswas, Liang Fu, Chris R. Laumann, and Subir Sachdev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-29

Description: Author(s): Rudro R. Biswas, Liang Fu, Chris R. Laumann, and Subir Sachdev We describe a new class of spin liquids with global SU(2) spin-rotation symmetry in spin-1/2 systems on the triangular lattice, which have real Majorana fermion excitations carrying spin S =1 . The simplest translationally invariant mean-field state on the triangular lattice breaks time-reversal symme... [Phys. Rev. B 83, 245131] Published Tue Jun 28, 2011

Keywords: Electronic structure and strongly correlated systems

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Inversion-symmetric topological insulators (2011)

Taylor L. Hughes, Emil Prodan, and B. Andrei Bernevig

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-29

Description: Author(s): Taylor L. Hughes, Emil Prodan, and B. Andrei Bernevig We analyze translationally invariant insulators with inversion symmetry that fall outside the current established classification of topological insulators. These insulators exhibit no edge or surface modes in the energy spectrum and hence they are not edge metals when the Fermi level is in the bulk ... [Phys. Rev. B 83, 245132] Published Tue Jun 28, 2011

Keywords: Electronic structure and strongly correlated systems

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Real-space Green’s function approach to resonant inelastic x-ray scattering (2011)

J. J. Kas, J. J. Rehr, J. A. Soininen, and P. Glatzel

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-09

Description: Author(s): J. J. Kas, J. J. Rehr, J. A. Soininen, and P. Glatzel We present an ab initio theory of core and valence resonant inelastic x-ray scattering (RIXS) based on a real-space multiple-scattering Green’s function formalism and a quasiboson model Hamiltonian. Simplifying assumptions are made that lead to an approximation of the RIXS spectrum in terms of a con... [Phys. Rev. B 83, 235114] Published Wed Jun 08, 2011

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Electronic structure and f-orbital occupancy in Yb-substituted CeCoIn_{5} (2011)

C. H. Booth, T. Durakiewicz, C. Capan, D. Hurt, A. D. Bianchi, J. J. Joyce, and Z. Fisk

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-09

Description: Author(s): C. H. Booth, T. Durakiewicz, C. Capan, D. Hurt, A. D. Bianchi, J. J. Joyce, and Z. Fisk The local structure and 4 f orbital occupancy have been investigated in Ce 1- x Yb x CoIn 5 via Yb L III -edge extended x-ray absorption fine structure (EXAFS), Ce and Yb L III -edge x-ray absorption near-edge structure (XANES), and angle-resolved photoemission spectroscopy (ARPES) measurements. Yb(III) (4 f 13 )... [Phys. Rev. B 83, 235117] Published Wed Jun 08, 2011

Keywords: Electronic structure and strongly correlated systems

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Neutron Laue Diffraction Study on the Magnetic Phase Diagram of Multiferroic MnWO_{4} under Pulsed High Magnetic Fields (2011)

H. Nojiri, S. Yoshii, M. Yasui, K. Okada, M. Matsuda, J. -S. Jung, T. Kimura, L. Santodonato, G. E. Granroth, K. A. Ross, J. P. Carlo, and B. D. Gaulin

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): H. Nojiri, S. Yoshii, M. Yasui, K. Okada, M. Matsuda, J. -S. Jung, T. Kimura, L. Santodonato, G. E. Granroth, K. A. Ross, J. P. Carlo, and B. D. Gaulin We have combined time-of-flight neutron Laue diffraction and pulsed high magnetic fields at the Spallation Neutron Source to study the phase diagram of the multiferroic material MnWO 4 . The control of the field-pulse timing enabled an exploration of magnetic Bragg scattering through the time dependen... [Phys. Rev. Lett. 106, 237202] Published Wed Jun 08, 2011

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Magnetic impurity in a U(1) spin liquid with a spinon Fermi surface (2011)

P. Ribeiro and P. A. Lee

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-11

Description: Author(s): P. Ribeiro and P. A. Lee We address the problem of a magnetic impurity in a two-dimensional U (1) spin liquid where the spinons have gapless excitations near the Fermi surface and are coupled to an emergent gapless gauge field. Using a large N expansion, we analyze the strong coupling behavior and obtain the Kondo temperatur... [Phys. Rev. B 83, 235119] Published Fri Jun 10, 2011

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Electronic transport coefficients from ab initio simulations and application to dense liquid hydrogen (2011)

Bastian Holst, Martin French, and Ronald Redmer

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-11

Description: Author(s): Bastian Holst, Martin French, and Ronald Redmer Using Kubo’s linear response theory, we derive expressions for the frequency-dependent electrical conductivity (Kubo-Greenwood formula), thermopower, and thermal conductivity in a strongly correlated electron system. These are evaluated within ab initio molecular dynamics simulations in order to stu... [Phys. Rev. B 83, 235120] Published Fri Jun 10, 2011

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Gaudin models solver based on the correspondence between Bethe ansatz and ordinary differential equations (2011)

Alexandre Faribault, Omar El Araby, Christoph Sträter, and Vladimir Gritsev

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-14

Description: Author(s): Alexandre Faribault, Omar El Araby, Christoph Sträter, and Vladimir Gritsev We present a numerical approach which allows the solving of Bethe equations whose solutions define the eigenstates of Gaudin models. By focusing on a different set of variables, the canceling divergences which occur for certain values of the coupling strength no longer appear explicitly. The problem... [Phys. Rev. B 83, 235124] Published Mon Jun 13, 2011

Keywords: Electronic structure and strongly correlated systems

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Paired electron crystal: Order from frustration in the quarter-filled band (2011)

S. Dayal, R. T. Clay, H. Li, and S. Mazumdar

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-16

Description: Author(s): S. Dayal, R. T. Clay, H. Li, and S. Mazumdar We present a study of the effects of simultaneous charge and spin frustration on the two-dimensional strongly correlated quarter-filled band on an anisotropic triangular lattice. Our conclusions are based on exact diagonalization studies that include electron-electron interactions as well as adiabat... [Phys. Rev. B 83, 245106] Published Wed Jun 15, 2011

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Fractional Topological Phase for Entangled Qudits (2011)

L. E. Oxman and A. Z. Khoury

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): L. E. Oxman and A. Z. Khoury We investigate the topological structure of entangled qudits under unitary local operations. Different sectors are identified in the evolution, and their topological aspects are analyzed. The geometric phase is explicitly calculated in terms of the concurrence. As a main result, we predict a fractio... [Phys. Rev. Lett. 106, 240503] Published Wed Jun 15, 2011

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Direct Observation of Local Potassium Variation and Its Correlation to Electronic Inhomogeneity in (Ba_{1-x}K_{x})Fe_{2}As_{2} Pnictide (2011)

W. K. Yeoh, B. Gault, X. Y. Cui, C. Zhu, M. P. Moody, L. Li, R. K. Zheng, W. X Li, X. L. Wang, S. X. Dou, G. L. Sun, C. T. Lin, and S. P. Ringer

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): W. K. Yeoh, B. Gault, X. Y. Cui, C. Zhu, M. P. Moody, L. Li, R. K. Zheng, W. X Li, X. L. Wang, S. X. Dou, G. L. Sun, C. T. Lin, and S. P. Ringer Local fluctuations in the distribution of dopant atoms are thought to cause the nanoscale electronic disorder or phase separation in pnictide superconductors. Atom probe tomography has enabled the first direct observations of dopant species clustering in a K-doped 122-phase pnictide. First-principle... [Phys. Rev. Lett. 106, 247002] Published Wed Jun 15, 2011

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Iron Under Pressure: “Kohn Tweezers” and Remnant Magnetism (2011)

A. Monza, A. Meffre, F. Baudelet, J.-P. Rueff, M. d’Astuto, P. Munsch, S. Huotari, S. Lachaize, B. Chaudret, and Abhay Shukla

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): A. Monza, A. Meffre, F. Baudelet, J.-P. Rueff, M. d’Astuto, P. Munsch, S. Huotari, S. Lachaize, B. Chaudret, and Abhay Shukla In this work we investigate the magnetic and structural properties of bulk Fe and Fe nanoparticles under pressure with x-ray absorption and emission spectroscopies providing answers to two fundamental questions: (a) the chicken-or-egg problem for the magnetic and structural transitions and (b) magne... [Phys. Rev. Lett. 106, 247201] Published Wed Jun 15, 2011

Keywords: Condensed Matter: Electronic Properties, etc.

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Coexistence of Bulk Superconductivity and Charge Density Wave in Cu_{x}ZrTe_{3} (2011)

Xiangde Zhu, Hechang Lei, and C. Petrovic

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-16

Description: Author(s): Xiangde Zhu, Hechang Lei, and C. Petrovic We report the coexistence of bulk superconductivity with T c =3.8 K and charge density wave (CDW) in Cu intercalated quasi-two-dimensional crystals of ZrTe 3 . The Cu intercalation results in the expansion of the unit cell orthogonal to the Zr-Zr metal chains and partial filling of CDW energy gap. We p... [Phys. Rev. Lett. 106, 246404] Published Wed Jun 15, 2011

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Demonstration of Unconditional One-Way Quantum Computations for Continuous Variables (2011)

Ryuji Ukai, Noriaki Iwata, Yuji Shimokawa, Seiji C. Armstrong, Alberto Politi, Jun-ichi Yoshikawa, Peter van Loock, and Akira Furusawa

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): Ryuji Ukai, Noriaki Iwata, Yuji Shimokawa, Seiji C. Armstrong, Alberto Politi, Jun-ichi Yoshikawa, Peter van Loock, and Akira Furusawa One-way quantum computation is a very promising candidate to fulfill the capabilities of quantum information processing. Here we demonstrate an important set of unitary operations for continuous variables using a linear cluster state of four entangled optical modes. These operations are performed in... [Phys. Rev. Lett. 106, 240504] Published Fri Jun 17, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Fiber Transport of Spatially Entangled Photons (2011)

W. Löffler, T. G. Euser, E. R. Eliel, M. Scharrer, P. St. J. Russell, and J. P. Woerdman

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): W. Löffler, T. G. Euser, E. R. Eliel, M. Scharrer, P. St. J. Russell, and J. P. Woerdman Entanglement in the spatial degrees of freedom of photons is an interesting resource for quantum information. For practical distribution of such entangled photons, it is desirable to use an optical fiber, which in this case has to support multiple transverse modes. Here we report the use of a hollow... [Phys. Rev. Lett. 106, 240505] Published Fri Jun 17, 2011

Keywords: General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

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Nernst Response of the Landau Tubes in Graphite across the Quantum Limit (2011)

Benoît Fauqué, Zengwei Zhu, Tim Murphy, and Kamran Behnia

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-18

Description: Author(s): Benoît Fauqué, Zengwei Zhu, Tim Murphy, and Kamran Behnia We report on a study of the Nernst effect in graphite extended up to 45 T. The Nernst response sharply peaks when a Landau tube is squeezed inside the thermally fuzzy Fermi surface and presents a temperature-independent fixed point when the tube flattens to a single ring. Beyond the quantum limit, t... [Phys. Rev. Lett. 106, 246405] Published Fri Jun 17, 2011

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Optimal Protocols and Optimal Transport in Stochastic Thermodynamics (2011)

Erik Aurell, Carlos Mejía-Monasterio, and Paolo Muratore-Ginanneschi

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Erik Aurell, Carlos Mejía-Monasterio, and Paolo Muratore-Ginanneschi Thermodynamics of small systems has become an important field of statistical physics. Such systems are driven out of equilibrium by a control, and the question is naturally posed how such a control can be optimized. We show that optimization problems in small system thermodynamics are solved by (det... [Phys. Rev. Lett. 106, 250601] Published Mon Jun 20, 2011

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Incommensurate Spin-Density Wave Order in Electron-Doped BaFe_{2}As_{2} Superconductors (2011)

D. K. Pratt, M. G. Kim, A. Kreyssig, Y. B. Lee, G. S. Tucker, A. Thaler, W. Tian, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, B. N. Harmon, A. I. Goldman, and R. J. McQueeney

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): D. K. Pratt, M. G. Kim, A. Kreyssig, Y. B. Lee, G. S. Tucker, A. Thaler, W. Tian, J. L. Zarestky, S. L. Bud’ko, P. C. Canfield, B. N. Harmon, A. I. Goldman, and R. J. McQueeney Neutron diffraction studies of Ba(Fe 1-x Co x ) 2 As 2 reveal that commensurate antiferromagnetic order gives way to incommensurate magnetic order for Co compositions between 0.056〈 x 〈0.06 . The incommensurability has the form of a small transverse splitting (0, ± ϵ , 0) from the commensurate antiferroma... [Phys. Rev. Lett. 106, 257001] Published Mon Jun 20, 2011

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Thermally Limited Current Carrying Ability of Graphene Nanoribbons (2011)

Albert D. Liao, Justin Z. Wu, Xinran Wang, Kristof Tahy, Debdeep Jena, Hongjie Dai, and Eric Pop

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-21

Description: Author(s): Albert D. Liao, Justin Z. Wu, Xinran Wang, Kristof Tahy, Debdeep Jena, Hongjie Dai, and Eric Pop We investigate high-field transport in graphene nanoribbons (GNRs) on SiO 2 , up to breakdown. The maximum current density is limited by self-heating, but can reach 〉3 mA/ μ m for GNRs ∼15 nm wide. Comparison with larger, micron-sized graphene devices reveals that narrow GNRs benefit from 3D heat s... [Phys. Rev. Lett. 106, 256801] Published Mon Jun 20, 2011

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Energy Transport by Neutral Collective Excitations at the Quantum Hall Edge (2011)

E. V. Deviatov, A. Lorke, G. Biasiol, and L. Sorba

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): E. V. Deviatov, A. Lorke, G. Biasiol, and L. Sorba We use the edge of the quantum Hall sample to study the possibility for counterpropagating neutral collective excitations. A novel sample design allows us to independently investigate charge and energy transport along the edge. We experimentally observe an upstream energy transfer with respect to th... [Phys. Rev. Lett. 106, 256802] Published Wed Jun 22, 2011

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Deterministic Generation of Entangled Photons in Superconducting Resonator Arrays (2011)

Yong Hu and Lin Tian

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): Yong Hu and Lin Tian We present a scheme for the deterministic generation of entangled photon pairs in a superconducting resonator array. The resonators form a Jaynes-Cummings lattice via the coupling to superconducting qubits, and the Kerr-like nonlinearity arises due to the coupling. We show that entangled photons can... [Phys. Rev. Lett. 106, 257002] Published Wed Jun 22, 2011

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Evidence for Long-Lived Quasiparticles Trapped in Superconducting Point Contacts (2011)

M. Zgirski, L. Bretheau, Q. Le Masne, H. Pothier, D. Esteve, and C. Urbina

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): M. Zgirski, L. Bretheau, Q. Le Masne, H. Pothier, D. Esteve, and C. Urbina We have observed that the supercurrent across phase-biased, highly transmitting atomic size contacts is strongly reduced within a broad phase interval around π . We attribute this effect to quasiparticle trapping in one of the discrete subgap Andreev bound states formed at the contact. Trapping occur... [Phys. Rev. Lett. 106, 257003] Published Wed Jun 22, 2011

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Suppression of Zeeman Splitting of the Energy Levels of Exciton-Polariton Condensates in Semiconductor Microcavities in an External Magnetic Field (2011)

P. Walker, T. C. H. Liew, D. Sarkar, M. Durska, A. P. D. Love, M. S. Skolnick, J. S. Roberts, I. A. Shelykh, A. V. Kavokin, and D. N. Krizhanovskii

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-23

Description: Author(s): P. Walker, T. C. H. Liew, D. Sarkar, M. Durska, A. P. D. Love, M. S. Skolnick, J. S. Roberts, I. A. Shelykh, A. V. Kavokin, and D. N. Krizhanovskii A key property of equilibrium exciton-polariton condensates in semiconductor microcavities is the suppression of the Zeeman splitting under a magnetic field. By studying magnetophotoluminescence spectra from a GaAs microcavity, we show experimentally that a similar effect occurs in a nonequilibrium ... [Phys. Rev. Lett. 106, 257401] Published Wed Jun 22, 2011

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RKKY interaction and the nature of the ground state of double dots in parallel (2011)

M. Kulkarni and R. M. Konik

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-24

Description: Author(s): M. Kulkarni and R. M. Konik We argue through a combination of slave-boson mean-field theory and the Bethe ansatz that the ground state of closely spaced double quantum dots in parallel coupled to a single effective channel are Fermi liquids. We do so by studying the dots’ conductance, impurity entropy, and spin correlation. In... [Phys. Rev. B 83, 245121] Published Thu Jun 23, 2011

Keywords: Electronic structure and strongly correlated systems

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Exact Solution for the Kardar-Parisi-Zhang Equation with Flat Initial Conditions (2011)

Pasquale Calabrese and Pierre Le Doussal

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-25

Description: Author(s): Pasquale Calabrese and Pierre Le Doussal We provide the first exact calculation of the height distribution at arbitrary time t of the continuum Kardar-Parisi-Zhang (KPZ) growth equation in one dimension with flat initial conditions. We use the mapping onto a directed polymer with one end fixed, one free, and the Bethe ansatz for the replic... [Phys. Rev. Lett. 106, 250603] Published Fri Jun 24, 2011

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Designing Dirac points in two-dimensional lattices (2011)

Kenichi Asano and Chisa Hotta

American Physical Society (APS)

In: Physical Review B

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Publication Date: 2011-06-28

Description: Author(s): Kenichi Asano and Chisa Hotta We present a framework to elucidate the existence of accidental contacts of energy bands, particularly those called Dirac points which are the point contacts with linear energy dispersions in their vicinity. A generalized von Neumann–Wigner theorem we propose here gives the number of constraints on ... [Phys. Rev. B 83, 245125] Published Mon Jun 27, 2011

Keywords: Electronic structure and strongly correlated systems

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Observation of Dirac Holes and Electrons in a Topological Insulator (2011)

A. A. Taskin, Zhi Ren, Satoshi Sasaki, Kouji Segawa, and Yoichi Ando

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-28

Description: Author(s): A. A. Taskin, Zhi Ren, Satoshi Sasaki, Kouji Segawa, and Yoichi Ando We show that in the new topological-insulator compound Bi 1.5 Sb 0.5 Te 1.7 Se 1.3 one can achieve a surfaced-dominated transport where the surface channel contributes up to 70% of the total conductance. Furthermore, it was found that in this material the transport properties sharply reflect the time depen... [Phys. Rev. Lett. 107, 016801] Published Mon Jun 27, 2011

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Observation of Subdiffusion in a Disordered Interacting System (2011)

E. Lucioni, B. Deissler, L. Tanzi, G. Roati, M. Zaccanti, M. Modugno, M. Larcher, F. Dalfovo, M. Inguscio, and G. Modugno

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): E. Lucioni, B. Deissler, L. Tanzi, G. Roati, M. Zaccanti, M. Modugno, M. Larcher, F. Dalfovo, M. Inguscio, and G. Modugno We study the transport dynamics of matter-waves in the presence of disorder and nonlinearity. An atomic Bose-Einstein condensate that is localized in a quasiperiodic lattice in the absence of atom-atom interaction shows instead a slow expansion with a subdiffusive behavior when a controlled repulsiv... [Phys. Rev. Lett. 106, 230403] Published Wed Jun 08, 2011

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Brownian Motion with Active Fluctuations (2011)

Pawel Romanczuk and Lutz Schimansky-Geier

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): Pawel Romanczuk and Lutz Schimansky-Geier We study the effect of different types of fluctuation on the motion of self-propelled particles in two spatial dimensions. We distinguish between passive and active fluctuations. Passive fluctuations (e.g., thermal fluctuations) are independent of the orientation of the particle. In contrast, active... [Phys. Rev. Lett. 106, 230601] Published Wed Jun 08, 2011

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Metacinnabar (β-HgS): A Strong 3D Topological Insulator with Highly Anisotropic Surface States (2011)

François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publication Date: 2011-06-09

Description: Author(s): François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink We establish the presence of topologically protected edge states on the (001) surface of HgS in the zinc-blende structure using density-functional electronic structure calculations. The Dirac point of the edge state cone is very close to the bulk valence band maximum. The Dirac cone is extremely ani... [Phys. Rev. Lett. 106, 236806] Published Wed Jun 08, 2011

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