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Algebraic metrology: Nonoptimal but pretty good states and bounds (2015)

Michael Skotiniotis, Florian Fröwis, Wolfgang Dür, and Barbara Kraus

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Michael Skotiniotis, Florian Fröwis, Wolfgang Dür, and Barbara Kraus We investigate quantum metrology using a Lie algebraic approach for a class of Hamiltonians, including local and nearest-neighbor interaction Hamiltonians. Using this Lie algebraic formulation, we identify and construct highly symmetric states that admit Heisenberg scaling in precision for phase est… [Phys. Rev. A 92, 022323] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Relation between the Greenberger-Horne-Zeilinger–entanglement cost of preparing a multipartite pure state and its quantum discord (2015)

Seungho Yang and Hyunseok Jeong

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Seungho Yang and Hyunseok Jeong We investigate how much amount of Greenberger-Horne-Zeilinger (GHZ) entanglement is required in order to prepare a given multipartite state by local operations and classical communication (LOCC). We present a LOCC procedure that asymptotically converts GHZ states into an arbitrary multipartite pure … [Phys. Rev. A 92, 022322] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Universal holonomic quantum gates in decoherence-free subspace on superconducting circuits (2015)

Zheng-Yuan Xue, Jian Zhou, and Z. D. Wang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Zheng-Yuan Xue, Jian Zhou, and Z. D. Wang To implement a set of universal quantum logic gates based on non-Abelian geometric phases, it is conventional wisdom that quantum systems beyond two levels are required, which is extremely difficult to fulfill for superconducting qubits and appears to be a main reason why only single-qubit gates wer… [Phys. Rev. A 92, 022320] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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High-fidelity readout scheme for rare-earth solid-state quantum computing (2015)

A. Walther, L. Rippe, Y. Yan, J. Karlsson, D. Serrano, A. N. Nilsson, S. Bengtsson, and S. Kröll

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): A. Walther, L. Rippe, Y. Yan, J. Karlsson, D. Serrano, A. N. Nilsson, S. Bengtsson, and S. Kröll We propose and analyze a high-fidelity readout scheme for a single-instance approach to quantum computing in rare-earth-ion-doped crystals. The scheme is based on using different elements as qubit and readout ions, where the readout ions are doped into the material at a much lower concentration than… [Phys. Rev. A 92, 022319] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Real-time imaging of spin-to-orbital angular momentum hybrid remote state preparation (2015)

Manuel Erhard, Hammam Qassim, Harjaspreet Mand, Ebrahim Karimi, and Robert W. Boyd

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Manuel Erhard, Hammam Qassim, Harjaspreet Mand, Ebrahim Karimi, and Robert W. Boyd There exists two prominent methods to transfer information between two spatially separated parties, namely Alice ( A ) and Bob ( B ): quantum teleportation and remote state preparation. However, the difference between these methods is, in the teleportation scheme, the state to be transferred is complete… [Phys. Rev. A 92, 022321] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Optimal encoding capacity of a linear optical quantum channel (2015)

J. A. Smith, D. B. Uskov, and L. Kaplan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): J. A. Smith, D. B. Uskov, and L. Kaplan Here, we study the classical information capacity of a quantum channel, assuming linear optical encoding, as a function of available photons and optical modes. We present a formula for general channel capacity and show that this capacity is achieved without requiring the use of entangling operations… [Phys. Rev. A 92, 022324] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Suppressing systematic control errors to high orders (2015)

P. Bažant, H. Frydrych, G. Alber, and I. Jex

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): P. Bažant, H. Frydrych, G. Alber, and I. Jex Dynamical decoupling is a powerful method for protecting quantum information against unwanted interactions with the help of open-loop control pulses. Realistic control pulses are not ideal and may introduce additional systematic errors. We introduce a class of self-stabilizing pulse sequences capabl… [Phys. Rev. A 92, 022325] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Error suppression in Hamiltonian-based quantum computation using energy penalties (2015)

Adam D. Bookatz, Edward Farhi, and Leo Zhou

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Adam D. Bookatz, Edward Farhi, and Leo Zhou We consider the use of quantum error-detecting codes, together with energy penalties against leaving the code space, as a method for suppressing environmentally induced errors in Hamiltonian-based quantum computation. This method was introduced in Jordan et al. [ Phys. Rev. A 74 , 052322 (2006) ] in t… [Phys. Rev. A 92, 022317] Published Mon Aug 10, 2015

Schlagwort(e): Quantum information

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Dynamical quantum phase transitions in the Kitaev honeycomb model (2015)

Markus Schmitt and Stefan Kehrein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Markus Schmitt and Stefan Kehrein The notion of a dynamical quantum phase transition (DQPT) was recently introduced [Heyl et al. , Phys. Rev. Lett. 110 , 135704 (2013) ] as the nonanalytic behavior of the Loschmidt echo at critical times in the thermodynamic limit. In this work the quench dynamics in the ground state sector of the two… [Phys. Rev. B 92, 075114] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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10

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Creating and manipulating non-Abelian anyons in cold atom systems using auxiliary bosons (2015)

Yuhe Zhang, G. J. Sreejith, and J. K. Jain

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Yuhe Zhang, G. J. Sreejith, and J. K. Jain The possibility of realizing bosonic fractional quantum Hall effect in ultracold atomic systems suggests a new route to producing and manipulating anyons, by introducing auxiliary bosons of a different species that capture quasiholes and thus inherit their nontrivial braiding properties. States with… [Phys. Rev. B 92, 075116] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Origin of strong dispersion in Hubbard insulators (2015)

Y. Wang, K. Wohlfeld, B. Moritz, C. J. Jia, M. van Veenendaal, K. Wu, C.-C. Chen, and T. P. Devereaux

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Y. Wang, K. Wohlfeld, B. Moritz, C. J. Jia, M. van Veenendaal, K. Wu, C.-C. Chen, and T. P. Devereaux Using cluster perturbation theory, we explain the origin of the strongly dispersive feature found at high binding energy in the spectral function of the Hubbard model. By comparing the Hubbard and t − J − 3 s model spectra, we show that this dispersion does not originate from either coupling to spin fluc… [Phys. Rev. B 92, 075119] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Logarithmic temperature dependence of samarium ion valence in the heavy-fermion Sm_{x} La_{1−x} Os_{4} Sb_{12} (2015)

Kengo Fushiya, Ryoichi Miyazaki, Ryuji Higashinaka, Akira Yamada, Masaichiro Mizumaki, Satoshi Tsutsui, Kiyofumi Nitta, Tomoya Uruga, Bunya Suemitsu, Hideyuki Sato, and Yuji Aoki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Kengo Fushiya, Ryoichi Miyazaki, Ryuji Higashinaka, Akira Yamada, Masaichiro Mizumaki, Satoshi Tsutsui, Kiyofumi Nitta, Tomoya Uruga, Bunya Suemitsu, Hideyuki Sato, and Yuji Aoki We have measured x-ray absorption spectra at the Sm L 3 edge to investigate the Sm-ion valence of ( S m x L a 1 − x ) O s 4 S b 12 , in which field-insensitive heavy-fermion behavior appears at low temperatures for x = 1 . It has been found that the Sm-ion valance shifts to 2 + with La ion substitution; from v = + 2.78 ( x = 1 ) … [Phys. Rev. B 92, 075118] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Lifshitz transition and Van Hove singularity in a three-dimensional topological Dirac semimetal (2015)

Su-Yang Xu, Chang Liu, I. Belopolski, S. K. Kushwaha, R. Sankar, J. W. Krizan, T.-R. Chang, C. M. Polley, J. Adell, T. Balasubramanian, K. Miyamoto, N. Alidoust, Guang Bian, M. Neupane, H.-T. Jeng, C.-Y. Huang, W.-F. Tsai, T. Okuda, A. Bansil, F. C. Chou, R. J. Cava, H. Lin, and M. Z. Hasan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Su-Yang Xu, Chang Liu, I. Belopolski, S. K. Kushwaha, R. Sankar, J. W. Krizan, T.-R. Chang, C. M. Polley, J. Adell, T. Balasubramanian, K. Miyamoto, N. Alidoust, Guang Bian, M. Neupane, H.-T. Jeng, C.-Y. Huang, W.-F. Tsai, T. Okuda, A. Bansil, F. C. Chou, R. J. Cava, H. Lin, and M. Z. Hasan A three-dimensional (3D) Dirac semimetal is a novel state of quantum matter which has recently attracted much attention as an apparent 3D version of graphene. In this paper, we report results on the electronic structure of the 3D Dirac semimetal Na 3 Bi at a surface that reveals its nontrivial ground … [Phys. Rev. B 92, 075115] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Fermi-liquid theory for the single-impurity Anderson model (2015)

Christophe Mora, Cătălin Paşcu Moca, Jan von Delft, and Gergely Zaránd

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Christophe Mora, Cătălin Paşcu Moca, Jan von Delft, and Gergely Zaránd We generalize Nozières' Fermi-liquid theory for the low-energy behavior of the Kondo model to that of the single-impurity Anderson model. In addition to the electrons' phase shift at the Fermi energy, the low-energy Fermi-liquid theory is characterized by four Fermi-liquid parameters: the two given … [Phys. Rev. B 92, 075120] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Resolving CuO chain and CuO_{2} plane contributions to the YBa_{2} Cu_{3} O_{7−δ} valence band by standing-wave excited hard x-ray photoelectron spectroscopy (2015)

S. Thiess, T.-L. Lee, C. Aruta, C. T. Lin, F. Venturini, N. B. Brookes, B. C. C. Cowie, and J. Zegenhagen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): S. Thiess, T.-L. Lee, C. Aruta, C. T. Lin, F. Venturini, N. B. Brookes, B. C. C. Cowie, and J. Zegenhagen We analyzed the valence band (VB) of the 90 K high-temperature superconductor YBa 2 Cu 3 O 7 − δ by photoelectron spectroscopy under standing-wave excitation employing hard x rays. Precisely positioning the standing-wave intensity in the unit cell allows selectively probing the VB yield from the CuO chains… [Phys. Rev. B 92, 075117] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Resonant inelastic x-ray scattering on single magnons at oxygen K edges (2015)

Beom Hyun Kim and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Beom Hyun Kim and Jeroen van den Brink The recent discovery that resonant inelastic x-ray scattering can probe single-magnon (SM) dispersions in transition metal (TM) oxides when the x-ray energy is tuned to the TM L edge has put this technique on a par with inelastic neutron scattering. It is generally presumed that selection rules forb… [Phys. Rev. B 92, 081105(R)] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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17

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Ultralong-range order in the Fermi-Hubbard model with long-range interactions (2015)

Erik G. C. P. van Loon, Mikhail I. Katsnelson, and Mikhail Lemeshko

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Erik G. C. P. van Loon, Mikhail I. Katsnelson, and Mikhail Lemeshko We use the dual boson approach to reveal the phase diagram of the Fermi-Hubbard model with long-range dipole-dipole interactions. By using a large-scale finite-temperature calculation on a 64 × 64 square lattice we demonstrate the existence of a novel phase, possessing an “ultralong-range” order. The … [Phys. Rev. B 92, 081106(R)] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Quantized topological magnetoelectric effect of the zero-plateau quantum anomalous Hall state (2015)

Jing Wang, Biao Lian, Xiao-Liang Qi, and Shou-Cheng Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Jing Wang, Biao Lian, Xiao-Liang Qi, and Shou-Cheng Zhang Motivated by the possibility of experimental detection of the topological magnetoelectric effect the authors put forth a theoretical proposal for its realization in the zero plateau quantum anomalous Hall state of a ferromagnet-topological insulator heterostructure. [Phys. Rev. B 92, 081107(R)] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Characterization of topological phase transitions via topological properties of transition points (2015)

Linhu Li and Shu Chen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Linhu Li and Shu Chen We study topological properties of phase transition points of topological quantum phase transitions by assigning a topological invariant defined on a closed circle or surface surrounding the phase transition point in the parameter space of momentum and transition driving parameter. By applying our s… [Phys. Rev. B 92, 085118] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Kondo physics in a Ni impurity embedded in O-doped Au chains (2015)

S. Di Napoli, M. A. Barral, P. Roura-Bas, L. O. Manuel, A. M. Llois, and A. A. Aligia

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): S. Di Napoli, M. A. Barral, P. Roura-Bas, L. O. Manuel, A. M. Llois, and A. A. Aligia By means of ab initio calculations we study the effect of O doping of Au chains containing a nanocontact represented by a Ni atom as a magnetic impurity. In contrast to pure Au chains, we find that with a minimum O doping the 5 d x z , y z states of Au are pushed up, crossing the Fermi level. We also find… [Phys. Rev. B 92, 085120] Published Wed Aug 12, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Chiral triplet superconductivity on the graphene lattice (2015)

J. P. L. Faye, P. Sahebsara, and D. Sénéchal

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): J. P. L. Faye, P. Sahebsara, and D. Sénéchal Motivated by the possibility of superconductivity in doped graphene sheets, we investigate superconducting order in the extended Hubbard model on the two-dimensional graphene lattice using the variational cluster approximation (VCA) and the cellular dynamical mean-field theory (CDMFT) with an exact … [Phys. Rev. B 92, 085121] Published Wed Aug 12, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Infinite matrix product states, boundary conformal field theory, and the open Haldane-Shastry model (2015)

Hong-Hao Tu and Germán Sierra

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Hong-Hao Tu and Germán Sierra We show that infinite matrix product states (MPSs) constructed from conformal field theories can describe ground states of one-dimensional critical systems with open boundary conditions. To illustrate this, we consider a simple infinite MPS for a spin-1/2 chain and derive an inhomogeneous open Halda… [Phys. Rev. B 92, 041119(R)] Published Wed Jul 29, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Topological states in a microscopic model of interacting fermions (2015)

Nicolai Lang and Hans Peter Büchler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Nicolai Lang and Hans Peter Büchler Motivated by the question of topological classification in interacting models the authors study an exactly solvable two-leg ladder model of spinless fermions with attractive interactions and find its ground states and correlation functions. They also demonstrate the appearance of topologically protected edge states and derive their braiding properties on a microscopic level. [Phys. Rev. B 92, 041118(R)] Published Wed Jul 29, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Covalency in oxidized uranium (2015)

J. G. Tobin, S.-W. Yu, R. Qiao, W. L. Yang, C. H. Booth, D. K. Shuh, A. M. Duffin, D. Sokaras, D. Nordlund, and T.-C. Weng

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): J. G. Tobin, S.-W. Yu, R. Qiao, W. L. Yang, C. H. Booth, D. K. Shuh, A. M. Duffin, D. Sokaras, D. Nordlund, and T.-C. Weng Using x-ray emission spectroscopy and absorption spectroscopy, it has been possible to directly access the states in the unoccupied conduction bands that are involved with 5 f and 6 d covalency in oxidized uranium. By varying the oxidizing agent, the degree of 5 f covalency can be manipulated and monit… [Phys. Rev. B 92, 045130] Published Wed Jul 29, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Dynamic entanglement transfer in a double-cavity optomechanical system (2015)

Tiantian Huan, Rigui Zhou, and Hou Ian

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Tiantian Huan, Rigui Zhou, and Hou Ian We give a theoretical study of a double-cavity system in which a mechanical resonator beam is coupled to two cavity modes on both sides through radiation pressures. The indirect coupling between the cavities via the resonator sets up a correlation in the optomechanical entanglements between the two … [Phys. Rev. A 92, 022301] Published Mon Aug 03, 2015

Schlagwort(e): Quantum information

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Large and small Fermi-surface spin density waves in the Kondo lattice model (2015)

Robert Peters and Norio Kawakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Robert Peters and Norio Kawakami We demonstrate the existence of metallic spin density waves (SDWs) in the Kondo lattice model on a square lattice for a wide range of parameters by means of real space dynamical mean-field theory. In these SDWs, the spin polarization as well as the charge density depend on the lattice site and are m… [Phys. Rev. B 92, 075103] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Interactions along an entanglement cut in 2+1D Abelian topological phases (2015)

Jennifer Cano, Taylor L. Hughes, and Michael Mulligan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Jennifer Cano, Taylor L. Hughes, and Michael Mulligan A given fractional quantum Hall state may admit multiple, distinct edge phases on its boundary. We explore the implications that multiple edge phases have for the entanglement spectrum and entropy of a given bulk state. We describe the precise manner in which the entanglement spectrum depends upon l… [Phys. Rev. B 92, 075104] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Pseudopotential for the electron-electron interaction (2015)

J. H. Lloyd-Williams, R. J. Needs, and G. J. Conduit

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): J. H. Lloyd-Williams, R. J. Needs, and G. J. Conduit We propose a pseudopotential for the electron-electron Coulomb interaction to improve the efficiency of many-body electronic structure calculations. The pseudopotential accurately replicates the scattering properties of the Coulomb interaction, and recovers the analytical solution for two electrons … [Phys. Rev. B 92, 075106] Published Wed Aug 05, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Non-Abelian phases in two-component ν=2/3 fractional quantum Hall states: Emergence of Fibonacci anyons (2015)

Zhao Liu, Abolhassan Vaezi, Kyungmin Lee, and Eun-Ah Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Zhao Liu, Abolhassan Vaezi, Kyungmin Lee, and Eun-Ah Kim Recent theoretical insights into the possibility of non-Abelian phases in ν = 2 / 3 fractional quantum Hall states revived the interest in the numerical phase diagram of the problem. We investigate the effect of various kinds of two-body interlayer couplings on the (330) bilayer state and exactly solve … [Phys. Rev. B 92, 081102(R)] Published Wed Aug 05, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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NMR evidence of anisotropic Kondo liquid behavior in CeIrIn_{5} (2015)

A. C. Shockley, K. R. Shirer, J. Crocker, A. P. Dioguardi, C. H. Lin, D. M. Nisson, N. ap; Roberts-Warren, P. Klavins, and N. J. Curro

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. C. Shockley, K. R. Shirer, J. Crocker, A. P. Dioguardi, C. H. Lin, D. M. Nisson, N. apRoberts-Warren, P. Klavins, and N. J. Curro We report detailed Knight-shift measurements of the two indium sites in the heavy-fermion compound CeIrIn 5 as a function of temperature and field orientation. We find that the Knight-shift anomaly is orientation dependent, with a crossover temperature T * that varies by 50% as the field is rotated fr… [Phys. Rev. B 92, 085108] Published Wed Aug 05, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Scanning tunneling microscopy of the charge density wave in 1T−TiSe_{2} in the presence of single atom defects (2015)

A. M. Novello, B. Hildebrand, A. Scarfato, C. Didiot, G. Monney, A. Ubaldini, H. Berger, D. R. Bowler, P. Aebi, and Ch. Renner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. M. Novello, B. Hildebrand, A. Scarfato, C. Didiot, G. Monney, A. Ubaldini, H. Berger, D. R. Bowler, P. Aebi, and Ch. Renner We present a detailed low-temperature scanning tunneling microscopy (STM) study of the commensurate charge density wave (CDW) in 1 T − TiSe 2 in the presence of single atom defects. We find no significant modification of the CDW lattice in single crystals with native defect concentrations where some bul… [Phys. Rev. B 92, 081101(R)] Published Tue Aug 04, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Detecting multipartite spatial entanglement with modular variables (2015)

M. R. Barros, O. J. Farías, A. Keller, T. Coudreau, P. Milman, and S. P. Walborn

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): M. R. Barros, O. J. Farías, A. Keller, T. Coudreau, P. Milman, and S. P. Walborn Interference phenomena of quantum systems have been studied in the context of fundamental aspects of quantum physics and are considered a necessary resource for quantum information. Here we investigate the interference of multiparticle wave packets in terms of modular variables, which is a natural a… [Phys. Rev. A 92, 022308] Published Wed Aug 05, 2015

Schlagwort(e): Quantum information

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Quantum oblivious set-member decision protocol (2015)

Run-hua Shi, Yi Mu, Hong Zhong, and Shun Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Run-hua Shi, Yi Mu, Hong Zhong, and Shun Zhang We present and define a privacy-preserving problem called the oblivious set-member decision problem, which allows a server to decide whether a private secret of a user is a member of his private set in an oblivious manner. Namely, if the secret belongs to his private set, he does not know which memb… [Phys. Rev. A 92, 022309] Published Wed Aug 05, 2015

Schlagwort(e): Quantum information

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Thermodynamic consistency of the charge response in dynamical mean-field based approaches (2015)

Erik G. C. P. van Loon, Hartmut Hafermann, Alexander I. Lichtenstein, and Mikhail I. Katsnelson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Erik G. C. P. van Loon, Hartmut Hafermann, Alexander I. Lichtenstein, and Mikhail I. Katsnelson We consider the thermodynamic consistency of the charge response function in the (extended) Hubbard model. In dynamical mean-field theory (DMFT), thermodynamic consistency is preserved. We prove that the static, homogeneous DMFT susceptibility is consistent as long as vertex corrections obtained fro… [Phys. Rev. B 92, 085106] Published Tue Aug 04, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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New geometric representations of the CMB two-point correlation function (2015)

Andre L. D. Froes, Thiago S. Pereira, Armando Bernui, and Glenn D. Starkman

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-07

Beschreibung: Author(s): Andre L. D. Froes, Thiago S. Pereira, Armando Bernui, and Glenn D. Starkman When searching for deviations of statistical isotropy in the cosmic microwave background, a popular strategy is to write the two-point correlation function (2pcf) as the most general function of four spherical angles (i.e., two unit vectors) in the celestial sphere. Then, using a basis of bipolar sp… [Phys. Rev. D 92, 043508] Published Thu Aug 06, 2015

Schlagwort(e): Cosmology

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Storage and retrieval of microwave fields at the single-photon level in a spin ensemble (2015)

C. Grezes, B. Julsgaard, Y. Kubo, W. L. Ma, M. Stern, A. Bienfait, K. Nakamura, J. Isoya, S. Onoda, T. Ohshima, V. Jacques, D. Vion, D. Esteve, R. B. Liu, K. Mølmer, and P. Bertet

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): C. Grezes, B. Julsgaard, Y. Kubo, W. L. Ma, M. Stern, A. Bienfait, K. Nakamura, J. Isoya, S. Onoda, T. Ohshima, V. Jacques, D. Vion, D. Esteve, R. B. Liu, K. Mølmer, and P. Bertet We report the storage of microwave pulses at the single-photon level in a spin-ensemble memory consisting of 10 10 nitrogen-vacancy centers in a diamond crystal coupled to a superconducting L C resonator. The energy of the signal, retrieved 100 μ s later by spin-echo techniques, reaches 0.3 % of the ener… [Phys. Rev. A 92, 020301(R)] Published Fri Aug 07, 2015

Schlagwort(e): Quantum information

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Interference visibility, entanglement, and quantum correlation (2015)

Lin Zhang, Arun Kumar Pati, and Junde Wu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Lin Zhang, Arun Kumar Pati, and Junde Wu In quantum information and communication two fundamental nonclassical features that one exploits in harnessing the true power of composite quantum systems are the interference and quantum correlations. We show how a concept akin to interference can be connected to entanglement and quantum correlatio… [Phys. Rev. A 92, 022316] Published Fri Aug 07, 2015

Schlagwort(e): Quantum information

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Renormalization group analysis of a neck-narrowing Lifshitz transition in the presence of weak short-range interactions in two dimensions (2015)

Sedigh Ghamari, Sung-Sik Lee, and Catherine Kallin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Sedigh Ghamari, Sung-Sik Lee, and Catherine Kallin We study a system of weakly interacting electrons described by the energy dispersion ξ ( k ) = k x 2 − k y 2 − μ in two dimensions within a renormalization group approach. This energy dispersion exhibits a neck-narrowing Lifshitz transition at the critical chemical potential μ c = 0 where a van Hove singularity dev… [Phys. Rev. B 92, 085112] Published Thu Aug 06, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Qudit color codes and gauge color codes in all spatial dimensions (2015)

Fern H. E. Watson, Earl T. Campbell, Hussain Anwar, and Dan E. Browne

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Fern H. E. Watson, Earl T. Campbell, Hussain Anwar, and Dan E. Browne Two-level quantum systems, qubits, are not the only basis for quantum computation. Advantages exist in using qudits, d -level quantum systems, as the basic carrier of quantum information. We show that color codes, a class of topological quantum codes with remarkable transversality properties, can be … [Phys. Rev. A 92, 022312] Published Fri Aug 07, 2015

Schlagwort(e): Quantum information

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Dynamical rephasing of ensembles of qudits (2015)

Nikolay V. Vitanov

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Nikolay V. Vitanov Dynamical decoupling is an established tool for protecting the quantum state of a qubit from decoherence. This paper extends the simplest dynamical decoupling technique for qubits—the Carr-Purcell-Meiboom-Gill's two-pulse rephasing sequence—to qudits with an arbitrary number of states. The pulse seq… [Phys. Rev. A 92, 022314] Published Fri Aug 07, 2015

Schlagwort(e): Quantum information

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t_{2g} -orbital model on a honeycomb lattice: Application to the antiferromagnet SrRu_{2} O_{6} (2015)

Da Wang, Wan-Sheng Wang, and Qiang-Hua Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Da Wang, Wan-Sheng Wang, and Qiang-Hua Wang Motivated by the recent discovery of high-temperature antiferromagnet SrRu 2 O 6 [Hiley et al. , Angew. Chem. Int. Ed. 53 , 4423 (2014) ; Tian et al. , arXiv:1504.03642 ] and its potential to be the parent of a new superconductor upon doping, we construct a minimal t 2 g -orbital model on a honeycomb lattice… [Phys. Rev. B 92, 075112] Published Fri Aug 07, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Dichroism as a probe for parity-breaking phases of spin-orbit coupled metals (2015)

M. R. Norman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): M. R. Norman Recently, a general formalism was presented for gyrotropic, ferroelectric, and multipolar order in spin-orbit coupled metals induced by spin-spin interactions. Here, I point out that the resulting order parameters are equivalent to expectation values of operators that determine natural circular dich… [Phys. Rev. B 92, 075113] Published Fri Aug 07, 2015

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Transport properties for a quantum dot coupled to normal leads with a pseudogap (2015)

Bunpei Hara, Akihisa Koga, and Tomosuke Aono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Bunpei Hara, Akihisa Koga, and Tomosuke Aono We study transport properties for a quantum dot coupled to normal leads with a pseudogap density of states at zero temperature, using the second-order perturbation theory based on the Keldysh formalism. We clarify that the hybridization function Γ ( ω ) ∝ | ω | r ( 0 ≤ r 〈 1 ) induces the cusp or dip structure … [Phys. Rev. B 92, 081103(R)] Published Thu Aug 06, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Determination of Tomonaga-Luttinger parameters for a two-component liquid (2015)

Olabode M. Sule, Hitesh J. Changlani, Isao Maruyama, and Shinsei Ryu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Olabode M. Sule, Hitesh J. Changlani, Isao Maruyama, and Shinsei Ryu We provide evidence for the mapping of critical spin-1 chains, in particular the SU ( 3 ) symmetric bilinear-biquadratic model with additional interactions, to free boson theories using exact diagonalization and the density-matrix renormalization-group algorithm. Using the correspondence with a conform… [Phys. Rev. B 92, 075128] Published Tue Aug 18, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Large-gap quantum spin Hall states in decorated stanene grown on a substrate (2015)

Yong Xu, Peizhe Tang, and Shou-Cheng Zhang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Yong Xu, Peizhe Tang, and Shou-Cheng Zhang Two-dimensional stanene is a promising candidate material for realizing a room-temperature quantum spin Hall (QSH) effect. Monolayer stanene has recently been fabricated by molecular beam epitaxy, but shows metallic features on a Bi 2 Te 3 (111) substrate, which motivates us to study the important influ… [Phys. Rev. B 92, 081112(R)] Published Tue Aug 18, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Correlation-based entanglement criterion in bipartite multiboson systems (2015)

Wiesław Laskowski, Marcin Markiewicz, Danny Rosseau, Tim Byrnes, Kamil Kostrzewa, and Adrian Kołodziejski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Wiesław Laskowski, Marcin Markiewicz, Danny Rosseau, Tim Byrnes, Kamil Kostrzewa, and Adrian Kołodziejski We describe a criterion for the detection of entanglement between two multiboson systems. The criterion is based on calculating correlations of Gell-Mann matrices with a fixed boson number on each subsystem. This applies naturally to systems such as two entangled spinor Bose-Einstein condensates. We… [Phys. Rev. A 92, 022339] Published Tue Aug 18, 2015

Schlagwort(e): Quantum information

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Dynamical de Sitter phase and nontrivial holonomy in strongly coupled gauge theories in an expanding universe (2015)

Ariel R. Zhitnitsky

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Ariel R. Zhitnitsky We discuss a new scenario for early cosmology when the inflationary de Sitter phase emerges dynamically. This genuine quantum effect occurs as a result of dynamics of the topologically nontrivial sectors in a strongly coupled QCD-like gauge theory in an expanding universe. We test these ideas by exp… [Phys. Rev. D 92, 043512] Published Tue Aug 18, 2015

Schlagwort(e): Cosmology

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Time and spatial parity operations with trapped ions (2015)

Xiao-Hang Cheng, Unai Alvarez-Rodriguez, Lucas Lamata, Xi Chen, and Enrique Solano

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Xiao-Hang Cheng, Unai Alvarez-Rodriguez, Lucas Lamata, Xi Chen, and Enrique Solano We propose a physical implementation of time and spatial parity transformations, as well as Galilean boosts, in a trapped-ion quantum simulator. By embedding the simulated model into an enlarged simulating Hilbert space, these fundamental symmetry operations can be fully realized and measured with i… [Phys. Rev. A 92, 022344] Published Wed Aug 19, 2015

Schlagwort(e): Quantum information

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Testing the nonlocal kinetic energy functional of an inhomogeneous, two-dimensional degenerate Fermi gas within the average density approximation (2015)

J. Towers, B. P. van Zyl, and W. Kirkby

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): J. Towers, B. P. van Zyl, and W. Kirkby In a recent paper [B. P. van Zyl et al. , Phys. Rev. A 89 , 022503 (2014) ], the average density approximation (ADA) was implemented to develop a parameter-free, nonlocal kinetic energy functional to be used in the orbital-free density functional theory of an inhomogeneous, two-dimensional (2D) Fermi … [Phys. Rev. B 92, 075129] Published Thu Aug 20, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Manifestations of topological band crossings in bulk entanglement spectrum: An analytical study for integer quantum Hall states (2015)

Chi-Ken Lu, Dah-Wei Chiou, and Feng-Li Lin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Chi-Ken Lu, Dah-Wei Chiou, and Feng-Li Lin We consider integer quantum Hall states and calculate the bulk entanglement spectrum by formulating the correlation matrix in the guiding center representation. Our analytical approach is based on the strategy of redefining the inner product of states in the Hilbert space, via a projection operator,… [Phys. Rev. B 92, 075130] Published Thu Aug 20, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Incomplete protection of the surface Weyl cones of the Kondo insulator SmB_{6} : Spin exciton scattering (2015)

G. A. Kapilevich, P. S. Riseborough, A. X. Gray, M. Gulacsi, Tomasz Durakiewicz, and J. L. Smith

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): G. A. Kapilevich, P. S. Riseborough, A. X. Gray, M. Gulacsi, Tomasz Durakiewicz, and J. L. Smith The compound SmB 6 is a Kondo insulator, where the lowest-energy bulk electronic excitations are spin-excitons. It also has surface states that are subjected to strong spin-orbit coupling. It has been suggested that SmB 6 is also a topological insulator. Here we show that, despite the absence of time-… [Phys. Rev. B 92, 085133] Published Thu Aug 20, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Real-space Eliashberg approach to charge order of electrons coupled to dynamic antiferromagnetic fluctuations (2015)

Johannes Bauer and Subir Sachdev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Johannes Bauer and Subir Sachdev We study charge-ordered solutions for fermions on a square lattice interacting with dynamic antiferromagnetic fluctuations. Our approach is based on real-space Eliashberg equations, which are solved self-consistently. We first show that the antiferromagnetic fluctuations can induce arc features in t… [Phys. Rev. B 92, 085134] Published Thu Aug 20, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Continuous-variable entanglement mediated by a thermal oscillator (2015)

Vojtěch Kupčík and Radim Filip

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Vojtěch Kupčík and Radim Filip We discuss the deterministic Gaussian entangling procedure between continuous variables of two directly noninteracting oscillators. The oscillators can only couple to the same mediating oscillator, which is initially at arbitrary noisy state and can be lost after the procedure. Unitary idealization … [Phys. Rev. A 92, 022346] Published Fri Aug 21, 2015

Schlagwort(e): Quantum information

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Traversable wormholes and non-singular black holes from the vacuum of quadratic gravity (2015)

Francis Duplessis and Damien A. Easson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Francis Duplessis and Damien A. Easson We present new traversable wormhole and nonsingular black hole solutions in pure, scale-free R 2 gravity. These exotic solutions require no null energy condition violating or “exotic” matter and are supported only by the vacuum of the theory. It is well known that f ( R ) theories of gravity may be reca… [Phys. Rev. D 92, 043516] Published Mon Aug 24, 2015

Schlagwort(e): Cosmology

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Markovian theory of dynamical decoupling by periodic control (2015)

Krzysztof Szczygielski and Robert Alicki

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Krzysztof Szczygielski and Robert Alicki The recently developed formalism of Markovian master equations for quantum open systems with external periodic driving is applied to the theory of dynamical decoupling by periodic control. This new approach provides a more detailed quantitative picture of this phenomenon applicable both to tradition… [Phys. Rev. A 92, 022349] Published Mon Aug 24, 2015

Schlagwort(e): Quantum information

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State-transfer simulation in integrated waveguide circuits (2015)

L. Latmiral, C. Di Franco, P. L. Mennea, and M. S. Kim

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): L. Latmiral, C. Di Franco, P. L. Mennea, and M. S. Kim Spin-chain models have been widely studied in terms of quantum information processes, for instance for the faithful transmission of quantum states. Here, we investigate the limitations of mapping this process to an equivalent one through a bosonic chain. In particular, we keep in mind experimental i… [Phys. Rev. A 92, 022350] Published Mon Aug 24, 2015

Schlagwort(e): Quantum information

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Simulated annealing and entanglement of formation for (n⊗m)-dimensional mixed states (2015)

S. Allende, D. Altbir, and J. C. Retamal

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): S. Allende, D. Altbir, and J. C. Retamal The simulated annealing algorithm, a method commonly used to calculate properties of condensed-matter systems, is used to calculate entanglement of formation for higher-dimensional mixed states. The method relies on representing a mixed state as a pure state in an enlarged Hilbert space, and on the … [Phys. Rev. A 92, 022348] Published Mon Aug 24, 2015

Schlagwort(e): Quantum information

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Testing dimension and nonclassicality in communication networks (2015)

Joseph Bowles, Nicolas Brunner, and Marcin Pawłowski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Joseph Bowles, Nicolas Brunner, and Marcin Pawłowski We consider networks featuring preparation, transformation, and measurement devices, in which devices exchange communication via mediating physical systems. We investigate the problem of testing the dimension of the mediating systems in the device-independent scenario, that is, based on observable d… [Phys. Rev. A 92, 022351] Published Mon Aug 24, 2015

Schlagwort(e): Quantum information

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Electronic spin susceptibilities and superconductivity in HgBa_{2} CuO_{4+δ} from nuclear magnetic resonance (2015)

Damian Rybicki, Jonas Kohlrautz, Jürgen Haase, Martin Greven, Xudong Zhao, Mun K. Chan, Chelsey J. Dorow, and Michael J. Veit

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Damian Rybicki, Jonas Kohlrautz, Jürgen Haase, Martin Greven, Xudong Zhao, Mun K. Chan, Chelsey J. Dorow, and Michael J. Veit Nuclear magnetic resonance (NMR) experiments on single crystals of HgBa 2 CuO 4 + δ are presented that identify two distinct temperature-dependent spin susceptibilities: One is due to a spin component that is temperature-dependent above the critical temperature for superconductivity ( T c ) and reflects pse… [Phys. Rev. B 92, 081115(R)] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Sr_{2} Ir_{1−x} Rh_{x} O_{4} (x〈0.5): An inhomogeneous j_{eff} =1/2 Hubbard system (2015)

Shalinee Chikara, Daniel Haskel, Jae-Hoon Sim, Heung-Sik Kim, Cheng-Chien Chen, G. Fabbris, L. S. I. Veiga, N. M. Souza-Neto, J. Terzic, K. Butrouna, G. Cao, Myung Joon Han, and Michel van Veenendaal

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Shalinee Chikara, Daniel Haskel, Jae-Hoon Sim, Heung-Sik Kim, Cheng-Chien Chen, G. Fabbris, L. S. I. Veiga, N. M. Souza-Neto, J. Terzic, K. Butrouna, G. Cao, Myung Joon Han, and Michel van Veenendaal In a combined experimental and theoretical study, we investigate the properties of Sr 2 Ir 1 − x Rh x O 4 . From the branching ratios of the L -edge isotropic x-ray absorption spectra, we determine that the spin-orbit coupling is remarkably independent of x for both iridium and rhodium sites. DFT + U calculation… [Phys. Rev. B 92, 081114(R)] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Spatially resolved Landau level spectroscopy of the topological Dirac cone of bulk-type Sb_{2} Te_{3} (0001): Potential fluctuations and quasiparticle lifetime (2015)

C. Pauly, C. Saunus, M. Liebmann, and M. Morgenstern

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): C. Pauly, C. Saunus, M. Liebmann, and M. Morgenstern Using low-temperature scanning tunneling spectroscopy, we probe the Landau levels of the topologically protected state of Sb 2 Te 3 (0001) after in situ cleavage of a single crystal. Landau levels are visible for magnetic fields B ≥ 2 T at energies, which confirm the Dirac type dispersion including the ze… [Phys. Rev. B 92, 085140] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Camelback-shaped band reconciles heavy-electron behavior with weak electronic Coulomb correlations in superconducting TlNi_{2} Se_{2} (2015)

N. Xu, C. E. Matt, P. Richard, A. van Roekeghem, S. Biermann, X. Shi, S.-F. Wu, H. W. Liu, D. Chen, T. Qian, N. C. Plumb, M. Radović, Hangdong Wang, Qianhui Mao, Jianhua Du, Minghu Fang, J. Mesot, H. Ding, and M. Shi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): N. Xu, C. E. Matt, P. Richard, A. van Roekeghem, S. Biermann, X. Shi, S.-F. Wu, H. W. Liu, D. Chen, T. Qian, N. C. Plumb, M. Radović, Hangdong Wang, Qianhui Mao, Jianhua Du, Minghu Fang, J. Mesot, H. Ding, and M. Shi Combining photoemission spectroscopy, Raman spectroscopy, and first-principles calculations, we characterize superconducting TlNi 2 Se 2 as a material with weak electronic Coulomb correlations leading to a bandwidth renormalization of 1.4. We identify a camelback-shaped band, whose energetic position s… [Phys. Rev. B 92, 081116(R)] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Metal-insulator transition and local-moment collapse in FeO under pressure (2015)

I. Leonov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): I. Leonov We employ a combination of the ab initio band-structure methods and dynamical mean-field theory to determine the electronic structure and phase stability of paramagnetic FeO at high pressure and temperature. Our results reveal a high-spin to low-spin transition within the B1 crystal structure of FeO… [Phys. Rev. B 92, 085142] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Filter design for hybrid spin gates (2015)

Andreas Albrecht and Martin B. Plenio

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Andreas Albrecht and Martin B. Plenio The impact of control sequences on the environmental coupling of a quantum system can be described in terms of a filter. Here we analyze how the coherent evolution of two interacting spins subject to periodic control pulses, using the example of a nitrogen vacancy center coupled to a nuclear spin, c… [Phys. Rev. A 92, 022340] Published Tue Aug 18, 2015

Schlagwort(e): Quantum information

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Dynamic conductivity scaling in photoexcited V_{2} O_{3} thin films (2015)

Elsa Abreu, Siming Wang, Juan Gabriel Ramírez, Mengkun Liu, Jingdi Zhang, Kun Geng, Ivan K. Schuller, and Richard D. Averitt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Elsa Abreu, Siming Wang, Juan Gabriel Ramírez, Mengkun Liu, Jingdi Zhang, Kun Geng, Ivan K. Schuller, and Richard D. Averitt Optical-pump terahertz-probe spectroscopy is used to investigate ultrafast far-infrared conductivity dynamics during the insulator-to-metal transition in vanadium sesquioxide ( V 2 O 3 ) . The resultant conductivity increase occurs on a tens of picosecond time scale, exhibiting a strong dependence on the … [Phys. Rev. B 92, 085130] Published Tue Aug 18, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Robust Josephson-Kondo screening cloud in circuit quantum electrodynamics (2015)

Izak Snyman and Serge Florens

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Izak Snyman and Serge Florens We investigate the entanglement properties of a standard circuit-QED setup that consists of a Cooper pair box coupled to a long chain of Josephson junctions. We calculate the static charge polarization at finite distances along the device. Our calculations reveal a deep connection to the Kondo scree… [Phys. Rev. B 92, 085131] Published Tue Aug 18, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Interplay of electron-electron and electron-phonon interactions in the low-temperature phase of 1T−TaS_{2} (2015)

Doohee Cho, Yong-Heum Cho, Sang-Wook Cheong, Ki-Seok Kim, and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Doohee Cho, Yong-Heum Cho, Sang-Wook Cheong, Ki-Seok Kim, and Han Woong Yeom We investigate the interplay of the electron-electron and electron-phonon interactions in the electronic structure of an exotic insulating state in the layered dichalcogenide 1 T − TaS 2 , where the charge-density-wave (CDW) order coexists with a Mott correlation gap. Scanning tunneling microscopy and sp… [Phys. Rev. B 92, 085132] Published Tue Aug 18, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Quantum search with multiple walk steps per oracle query (2015)

Thomas G. Wong and Andris Ambainis

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Thomas G. Wong and Andris Ambainis We identify a key difference between quantum search by discrete- and continuous-time quantum walks: a discrete-time walk typically performs one walk step per oracle query, whereas a continuous-time walk can effectively perform multiple walk steps per query while only counting query time. As a result… [Phys. Rev. A 92, 022338] Published Tue Aug 18, 2015

Schlagwort(e): Quantum information

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Electroweak vacuum angle at finite temperature and implications for baryogenesis (2015)

Andrew J. Long, Hiren H. Patel, and Mark Trodden

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Andrew J. Long, Hiren H. Patel, and Mark Trodden We initiate a study of cosmological implications of sphaleron-mediated C P -violation arising from the electroweak vacuum angle under the reasonable assumption that the semiclassical suppression is lifted at finite temperature. In this article, we explore the implications for existing scenarios of bar… [Phys. Rev. D 92, 043513] Published Wed Aug 19, 2015

Schlagwort(e): Cosmology

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Quantum oscillations in the heavy-fermion compound YbPtBi (2015)

E. Mun, S. L. Bud'ko, Y. Lee, C. Martin, M. A. Tanatar, R. Prozorov, and P. C. Canfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): E. Mun, S. L. Bud'ko, Y. Lee, C. Martin, M. A. Tanatar, R. Prozorov, and P. C. Canfield Heavy fermion systems are useful for studying quantum criticality because the low energy scale associated with their large effective mass can be tuned by nonthermal control parameters. Here, Shubnikov-de Haas oscillations are observed in YbPtBi, a heavy fermion compound with an exceptionally large effective mass for electrons, at a high magnetic field that reveals the shape of the Fermi surface. In the future these observations, when combined with additional data at lower magnetic fields, could provide important information about quantum criticality in these systems. [Phys. Rev. B 92, 085135] Published Thu Aug 20, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Dynamical and anharmonic effects on the electron-phonon coupling and the zero-point renormalization of the electronic structure (2015)

G. Antonius, S. Poncé, E. Lantagne-Hurtubise, G. Auclair, X. Gonze, and M. Côté

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): G. Antonius, S. Poncé, E. Lantagne-Hurtubise, G. Auclair, X. Gonze, and M. Côté The renormalization of the band structure at zero temperature due to electron-phonon coupling is explored in diamond, BN, LiF, and MgO crystals. We implement a dynamical scheme to compute the frequency-dependent self-energy and the resulting quasiparticle electronic structure. Our calculations revea… [Phys. Rev. B 92, 085137] Published Fri Aug 21, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Electron-phonon coupling in a system with broken symmetry: Surface of Be(0001) (2015)

Te; Yu Chien (簡德宇), Xiaobo He, Sung-Kwan Mo, Makoto Hashimoto, Zahid Hussain, Zhi-Xun Shen, and E. W. Plummer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): TeYu Chien (簡德宇), Xiaobo He, Sung-Kwan Mo, Makoto Hashimoto, Zahid Hussain, Zhi-Xun Shen, and E. W. Plummer The momentum-resolved Eliashberg function (ELF) α 2 F ( ω , k ⇀ ) for the Be ( 0001 ) zone-center surface state was extracted from the high-quality angle-resolved photoemission spectroscopy (ARPES) data at the Fermi energy in the Γ ¯ → M ¯ direction, displaying ten peaks. A comparison of the peaks in the ELF to th… [Phys. Rev. B 92, 075133] Published Fri Aug 21, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Chiral degeneracies and Fermi-surface Chern numbers in bcc Fe (2015)

Daniel Gosálbez-Martínez, Ivo Souza, and David Vanderbilt

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Daniel Gosálbez-Martínez, Ivo Souza, and David Vanderbilt Using bcc Fe as a playground, the authors investigate the presence of chiral degeneracies in realistic band structures of ferromagnetic materials. They find ubiquitous Weyl points and demonstrate that Chern numbers can be transferred between Fermi sheets by varying the Fermi level or an external parameter such as the magnetization direction. [Phys. Rev. B 92, 085138] Published Fri Aug 21, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Compression of correlation matrices and an efficient method for forming matrix product states of fermionic Gaussian states (2015)

Matthew T. Fishman and Steven R. White

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Matthew T. Fishman and Steven R. White Here we present an efficient and numerically stable procedure for compressing a correlation matrix into a set of local unitary single-particle gates, which leads to a very efficient way of forming the matrix product state (MPS) approximation of a pure fermionic Gaussian state, such as the ground sta… [Phys. Rev. B 92, 075132] Published Fri Aug 21, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Suitable bases for quantum walks with Wigner coins (2015)

I. Bezděková, M. Štefaňák, and I. Jex

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): I. Bezděková, M. Štefaňák, and I. Jex The analysis of a physical problem simplifies considerably when one uses a suitable coordinate system. We apply this approach to the discrete-time quantum walks with coins given by 2 j + 1 -dimensional Wigner rotation matrices (Wigner walks), a model which was introduced in Miyazaki et al. [ Phys. Rev. A … [Phys. Rev. A 92, 022347] Published Mon Aug 24, 2015

Schlagwort(e): Quantum information

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Low-energy model and electron-hole doping asymmetry of single-layer Ruddlesden-Popper iridates (2015)

Alexander Hampel, Christoph Piefke, and Frank Lechermann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Alexander Hampel, Christoph Piefke, and Frank Lechermann We study the correlated electronic structure of single-layer iridates based on structurally undistorted Ba 2 IrO 4 . Starting from the first-principles band structure, the interplay between local Coulomb interactions and spin-orbit coupling is investigated by means of rotational-invariant slave-boson me… [Phys. Rev. B 92, 085141] Published Mon Aug 24, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Device- and semi–device-independent random numbers based on noninequality paradox (2015)

Hong-Wei Li, Marcin Pawłowski, Ramij Rahaman, Guang-Can Guo, and Zheng-Fu Han

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Hong-Wei Li, Marcin Pawłowski, Ramij Rahaman, Guang-Can Guo, and Zheng-Fu Han In this work, we propose device-independent true random number expansion protocols based on noninequality paradoxes such as Hardy's and Cabello's nonlocality arguments, thus highlighting the noninequality paradox as an important resource for device-independent quantum-information processing, in part… [Phys. Rev. A 92, 022327] Published Tue Aug 11, 2015

Schlagwort(e): Quantum information

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Simplified scheme for entanglement preparation with Rydberg pumping via dissipation (2015)

Shi-Lei Su, Qi Guo, Hong-Fu Wang, and Shou Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Shi-Lei Su, Qi Guo, Hong-Fu Wang, and Shou Zhang Inspired by recent work [Carr and Saffman, Phys. Rev. Lett. 111 , 033607 (2013) ], we propose a simplified scheme to prepare the two-atom maximally entangled states via dissipative Rydberg pumping. Compared with the former scheme, the simplified one involves fewer classical laser fields and Rydberg in… [Phys. Rev. A 92, 022328] Published Wed Aug 12, 2015

Schlagwort(e): Quantum information

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Nonequilibrium transport and statistics of Schwinger pair production in Weyl semimetals (2015)

Szabolcs Vajna, Balázs Dóra, and R. Moessner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Szabolcs Vajna, Balázs Dóra, and R. Moessner The nonequilibrium dynamics beyond the linear response of Weyl semimetals is studied after a sudden switching on of a dc electric field. The resulting current is a nonmonotonic function of time with an initial quick increase in polarization current followed by a power-law decay. Particle-hole creati… [Phys. Rev. B 92, 085122] Published Thu Aug 13, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Interacting realization of cosmological singularities with variable vacuum energy (2015)

Luis P. Chimento and Martín G. Richarte

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Luis P. Chimento and Martín G. Richarte We examine an interacting dark matter variable vacuum energy model for a spatially flat Friedmann-Roberston-Walker spacetime, focusing on the appearance of cosmological singularities such as big rip, big brake, big freeze, and big separation along with abrupt events (infinite γ - singularity and new … [Phys. Rev. D 92, 043511] Published Fri Aug 14, 2015

Schlagwort(e): Cosmology

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Measurement-device-independent quantum communication with an untrusted source (2015)

Feihu Xu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Feihu Xu Measurement-device-independent quantum key distribution (MDI-QKD) can provide enhanced security compared to traditional QKD, and it constitutes an important framework for a quantum network with an untrusted network server. Still, a key assumption in MDI-QKD is that the sources are trusted. We propos… [Phys. Rev. A 92, 012333] Published Wed Jul 29, 2015

Schlagwort(e): Quantum information

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Violations of Bell inequalities from random pure states (2015)

Max R. Atkin and Stefan Zohren

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): Max R. Atkin and Stefan Zohren We consider the expected violations of Bell inequalities from random pure states. More precisely, we focus on a slightly generalized version of the Collins-Gisin-Linden-Massar-Popescu inequality, which concerns Bell experiments of two parties, two measurement options, and N outcomes, and analyze the… [Phys. Rev. A 92, 012331] Published Wed Jul 29, 2015

Schlagwort(e): Quantum information

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Hardy's test as a device-independent dimension witness (2015)

Amit Mukherjee, Arup Roy, Some Sankar Bhattacharya, Subhadipa Das, Md. Rajjak Gazi, and Manik Banik

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Amit Mukherjee, Arup Roy, Some Sankar Bhattacharya, Subhadipa Das, Md. Rajjak Gazi, and Manik Banik Knowing the dimension of an unknown physical system has practical relevance, as dimensionality plays an important role in various information theoretic tasks. In this work we show that a modified version of Hardy's argument, which reveals the contradiction of quantum theory with local realism , turns… [Phys. Rev. A 92, 022302] Published Mon Aug 03, 2015

Schlagwort(e): Quantum information

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Cluster-based mean-field and perturbative description of strongly correlated fermion systems: Application to the one- and two-dimensional Hubbard model (2015)

Carlos A. Jiménez-Hoyos and Gustavo E. Scuseria

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Carlos A. Jiménez-Hoyos and Gustavo E. Scuseria We introduce a mean-field and a perturbative approach, based on clusters, to describe the ground state of fermionic strongly correlated systems. In the cluster mean-field approach, the ground-state wave function is written as a simple tensor product over optimized cluster states. The optimization of… [Phys. Rev. B 92, 085101] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Wannier function approach to realistic Coulomb interactions in layered materials and heterostructures (2015)

M. Rösner, E. Şaşıoğlu, C. Friedrich, S. Blügel, and T. O. Wehling

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): M. Rösner, E. Şaşıoğlu, C. Friedrich, S. Blügel, and T. O. Wehling We introduce an approach to derive realistic Coulomb interaction terms in freestanding layered materials and vertical heterostructures from ab initio modeling of the corresponding bulk materials. To this end, we establish a combination of calculations within the framework of the constrained random-p… [Phys. Rev. B 92, 085102] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Anomalous quantum Hall effect induced by disorder in topological insulators (2015)

Laurent Raymond, Alberto D. Verga, and Arnaud Demion

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Laurent Raymond, Alberto D. Verga, and Arnaud Demion We investigate a transition between a two-dimensional topological insulator conduction state, characterized by a conductance G = 2 (in fundamental units e 2 / h ) and a Chern insulator with G = 1 , induced by polarized magnetic impurities. Two kinds of coupling, ferromagnetic and antiferromagnetic, are consi… [Phys. Rev. B 92, 075101] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Robust local and nonlocal transport in the topological Kondo insulator SmB_{6} in the presence of a high magnetic field (2015)

Sangram Biswas, Ramya Nagarajan, Suman Sarkar, Kazi Rafsanjani Amin, M. Ciomaga Hatnean, S. Tewari, G. Balakrishnan, and Aveek Bid

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Sangram Biswas, Ramya Nagarajan, Suman Sarkar, Kazi Rafsanjani Amin, M. Ciomaga Hatnean, S. Tewari, G. Balakrishnan, and Aveek Bid SmB 6 has been predicted to be a Kondo topological insulator with topologically protected conducting surface states. We have studied quantitatively the electrical transport through surface states in high-quality single crystals of SmB 6 . We observe a large nonlocal surface signal at temperatures lower… [Phys. Rev. B 92, 085103] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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FLEX+DMFT approach to the d-wave superconducting phase diagram of the two-dimensional Hubbard model (2015)

Motoharu Kitatani, Naoto Tsuji, and Hideo Aoki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Motoharu Kitatani, Naoto Tsuji, and Hideo Aoki The dynamical mean-field theory (DMFT) combined with the fluctuation exchange (FLEX) method, namely, FLEX+DMFT, is an approach for correlated electron systems to incorporate both local and nonlocal long-range correlations in a self-consistent manner. We formulate FLEX+DMFT in a systematic way starti… [Phys. Rev. B 92, 085104] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Testing and extending the inflationary consistency relation for tensor modes (2015)

Latham Boyle, Kendrick M. Smith, Cora Dvorkin, and Neil Turok

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Latham Boyle, Kendrick M. Smith, Cora Dvorkin, and Neil Turok If observations confirm BICEP2’s claim of a tensor-scalar ratio r ≈ 0.2 on CMB scales, then the inflationary consistency relation n t = − r / 8 predicts a small negative value for the tensor spectral index n t . We show that future CMB polarization experiments should be able to confirm this prediction at seve… [Phys. Rev. D 92, 043504] Published Mon Aug 03, 2015

Schlagwort(e): Cosmology

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Time asymmetric extensions of general relativity (2015)

Marina Cortês, Henrique Gomes, and Lee Smolin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Marina Cortês, Henrique Gomes, and Lee Smolin We describe a class of modified gravity theories that deform general relativity in a way that breaks time reversal invariance and, very mildly, locality. The algebra of constraints, local physical degrees of freedom, and their linearized equations of motion, are unchanged, yet observable effects may… [Phys. Rev. D 92, 043502] Published Mon Aug 03, 2015

Schlagwort(e): Cosmology

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Experimental construction of a W superposition state and its equivalence to the Greenberger-Horne-Zeilinger state under local filtration (2015)

Debmalya Das, Shruti Dogra, Kavita Dorai, and Arvind

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Debmalya Das, Shruti Dogra, Kavita Dorai, and Arvind We experimentally construct a three-qubit entangled W superposition ( W W ¯ ) state on an NMR quantum information processor. We give a measurement-based filtration protocol for the invertible local operation (ILO) that converts the W W ¯ state to the Greenberger-Horne-Zeilinger (GHZ) state, using a regist… [Phys. Rev. A 92, 022307] Published Wed Aug 05, 2015

Schlagwort(e): Quantum information

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Channel-capacity gain in entanglement-assisted communication protocols based exclusively on linear optics, single-photon inputs, and coincidence photon counting (2015)

P. Lougovski and D. B. Uskov

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): P. Lougovski and D. B. Uskov Entanglement can effectively increase communication channel capacity as evidenced by dense coding that predicts a capacity gain of 1 bit when compared to entanglement-free protocols. However, dense coding relies on Bell states and when implemented using photons the capacity gain is bounded by 0.585 bi… [Phys. Rev. A 92, 022303] Published Tue Aug 04, 2015

Schlagwort(e): Quantum information

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Effect of source tampering in the security of quantum cryptography (2015)

Shi-Hai Sun, Feihu Xu, Mu-Sheng Jiang, Xiang-Chun Ma, Hoi-Kwong Lo, and Lin-Mei Liang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Shi-Hai Sun, Feihu Xu, Mu-Sheng Jiang, Xiang-Chun Ma, Hoi-Kwong Lo, and Lin-Mei Liang The security of source has become an increasingly important issue in quantum cryptography. Based on the framework of measurement-device-independent quantum key distribution (MDI-QKD), the source becomes the only region exploitable by a potential eavesdropper (Eve). Phase randomization is a cornersto… [Phys. Rev. A 92, 022304] Published Tue Aug 04, 2015

Schlagwort(e): Quantum information

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Proposal for quantum rational secret sharing (2015)

Arpita Maitra, Sourya Joyee De, Goutam Paul, and Asim K. Pal

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): Arpita Maitra, Sourya Joyee De, Goutam Paul, and Asim K. Pal A rational secret sharing scheme is a game in which each party responsible for reconstructing a secret tries to maximize his or her utility by obtaining the secret alone. Quantum secret sharing schemes, derived either from quantum teleportation or from quantum error correcting code, do not succeed w… [Phys. Rev. A 92, 022305] Published Tue Aug 04, 2015

Schlagwort(e): Quantum information

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Local unitary invariants of generic multiqubit states (2015)

Naihuan Jing, Shao-Ming Fei, Ming Li, Xianqing Li-Jost, and Tinggui Zhang

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): Naihuan Jing, Shao-Ming Fei, Ming Li, Xianqing Li-Jost, and Tinggui Zhang We present a complete set of local unitary invariants for generic multiqubit systems which gives necessary and sufficient conditions for two states being local unitary equivalent. These invariants are canonical polynomial functions in terms of the generalized Bloch representation of the quantum stat… [Phys. Rev. A 92, 022306] Published Tue Aug 04, 2015

Schlagwort(e): Quantum information

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Improved limits on sterile neutrino dark matter using full-sky Fermi Gamma-ray Burst Monitor data (2015)

Kenny C. Y. Ng, Shunsaku Horiuchi, Jennifer M. Gaskins, Miles Smith, and Robert Preece

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Kenny C. Y. Ng, Shunsaku Horiuchi, Jennifer M. Gaskins, Miles Smith, and Robert Preece Surprisingly stringent bounds on sterile neutrino dark matter are obtained by searching for spectral lines from sterile neutrino dark matter in the 25—40 keV mass range using data from Fermi Gamma-ray Burst Monitor (GBM). The constraints represent an order of magnitude improvement over previous results. [Phys. Rev. D 92, 043503] Published Tue Aug 04, 2015

Schlagwort(e): Cosmology

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Thema: Physik

Publiziert von American Physical Society (APS)

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Composition and temperature dependence of the Yb valence in YbMn_{6} Ge_{6−x} Sn_{x} studied by RIXS (2015)

T. Mazet, D. Malterre, M. François, L. Eichenberger, M. Grioni, C. Dallera, and G. Monaco

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): T. Mazet, D. Malterre, M. François, L. Eichenberger, M. Grioni, C. Dallera, and G. Monaco We investigate the composition and temperature (10–450 K) dependence of the Yb valence in YbMn 6 Ge 6 − x Sn x ( x = 0.0 , 3.8, 4.2, 4.4, and 5.5) using resonant inelastic x-ray scattering (RIXS). The observed change in the Yb valence with composition (from υ ∼ 3 for x = 0 to υ ∼ 2.7 for x = 5.5 ) is likely driven by n… [Phys. Rev. B 92, 075105] Published Wed Aug 05, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Post-measurement bipartite entanglement entropy in conformal field theories (2015)

M. A. Rajabpour

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): M. A. Rajabpour We derive exact formulas for bipartite von Neumann entanglement entropy after partial projective local measurement in ( 1 + 1 ) -dimensional conformal field theories with periodic and open boundary conditions. After defining the setup we will check numerically the validity of our results in the case of K… [Phys. Rev. B 92, 075108] Published Wed Aug 05, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Device-independent relativistic quantum bit commitment (2015)

Emily Adlam and Adrian Kent

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Emily Adlam and Adrian Kent We examine the possibility of device-independent relativistic quantum bit commitment, introducing three relativistic quantum bit commitment schemes that offer device-independent security against hypothetical postquantum adversaries subject only to the no-signaling principle. We discuss the potential… [Phys. Rev. A 92, 022315] Published Fri Aug 07, 2015

Schlagwort(e): Quantum information

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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Ruling out thermal dark matter with a black hole induced spiky profile in the M87 galaxy (2015)

Thomas Lacroix, Céline Bœhm, and Joseph Silk

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Thomas Lacroix, Céline Bœhm, and Joseph Silk Using the spectral energy distribution of M87, a nearby radio galaxy in the Virgo cluster, and assuming a supermassive black hole induced spike in the dark matter halo profile, we exclude any dark matter candidate with a velocity-independent (s-wave) annihilation cross-section of the order of ⟨ σ v ⟩ ∼ 1… [Phys. Rev. D 92, 043510] Published Fri Aug 07, 2015

Schlagwort(e): Cosmology

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

Publiziert von American Physical Society (APS)

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