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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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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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9

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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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15

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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

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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

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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

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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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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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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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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

Schlagwort(e): Electronic structure and strongly correlated systems

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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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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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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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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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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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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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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

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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

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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

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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

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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

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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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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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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

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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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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

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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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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

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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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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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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

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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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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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Publikationsdatum: 2015-08-06

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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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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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

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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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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

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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

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Surface states of perovskite iridates AIrO_{3}: Signatures of a topological crystalline metal with nontrivial Z_{2} index (2015)

Heung-Sik Kim, Yige Chen, and Hae-Young Kee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Heung-Sik Kim, Yige Chen, and Hae-Young Kee There have been increasing efforts in realizing topological metallic phases with nontrivial surface states. It was suggested that orthorhombic perovskite iridates are classified as a topological crystalline metal (TCM) with flat surface states protected by lattice symmetries. Here we perform first-p... [Phys. Rev. B 91, 235103] Published Wed Jun 03, 2015

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Charge transport in Ho_{x}Lu_{1−x}B_{12}: Separating positive and negative magnetoresistance in metals with magnetic ions (2015)

N. E. Sluchanko, A. L. Khoroshilov, M. A. Anisimov, A. N. Azarevich, A. V. Bogach, V. V. Glushkov, S. V. Demishev, V. N. Krasnorussky, N. A. Samarin, N. Yu. Shitsevalova, V. B. Filippov, A. V. Levchenko, G. Pristas, S. Gabani, and K. Flachbart

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): N. E. Sluchanko, A. L. Khoroshilov, M. A. Anisimov, A. N. Azarevich, A. V. Bogach, V. V. Glushkov, S. V. Demishev, V. N. Krasnorussky, N. A. Samarin, N. Yu. Shitsevalova, V. B. Filippov, A. V. Levchenko, G. Pristas, S. Gabani, and K. Flachbart The magnetoresistance (MR) Δ ρ / ρ of the cage-glass compound Ho x Lu 1 − x B 12 with various concentrations of magnetic holmium ions ( x ≤ 0.5 ) has been studied in detail concurrently with magnetization M ( T ) and Hall effect investigations on high-quality single crystals at temperatures 1.9–120 K and in magnetic... [Phys. Rev. B 91, 235104] Published Wed Jun 03, 2015

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Casimir effect mechanism of pairing between fermions in the vicinity of a magnetic quantum critical point (2015)

Yaroslav A. Kharkov and Oleg P. Sushkov

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Yaroslav A. Kharkov and Oleg P. Sushkov We consider two spin- 1 / 2 fermions in a two-dimensional magnetic system that is close to the O ( 3 ) magnetic quantum critical point (QCP) which separates magnetically ordered and disordered phases. Focusing on the disordered phase in the vicinity of the QCP, we demonstrate that the criticality results ... [Phys. Rev. B 91, 235105] Published Wed Jun 03, 2015

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Real-time observation of collective excitations in photoemission (2015)

C. Lemell, S. Neppl, G. Wachter, K. Tőkési, R. Ernstorfer, P. Feulner, R. Kienberger, and J. Burgdörfer

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): C. Lemell, S. Neppl, G. Wachter, K. Tőkési, R. Ernstorfer, P. Feulner, R. Kienberger, and J. Burgdörfer A method is proposed to solve a longstanding problem in photoelectron spectroscopy: the determination of the branching ratio between intrinsic and extrinsic plasmon generation. Attosecond metrology in combination with model simulations allow for a disentanglement of these excitation channels providing novel insight into the many-electron response of metals. [Phys. Rev. B 91, 241101(R)] Published Wed Jun 03, 2015

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Observation of the Kondo effect in a quadruple quantum dot (2015)

Runan Shang, Hai-Ou Li, Gang Cao, Guodong Yu, Ming Xiao, Tao Tu, Guang-Can Guo, Hongwen Jiang, A. M. Chang, and Guo-Ping Guo

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Runan Shang, Hai-Ou Li, Gang Cao, Guodong Yu, Ming Xiao, Tao Tu, Guang-Can Guo, Hongwen Jiang, A. M. Chang, and Guo-Ping Guo We investigate the Kondo effect in a quadruple-quantum-dot device of coupled double quantum dots (DQDs), which simultaneously contain intra-DQD and inter-DQD coupling. A variety of novel behaviors are observed. The differential conductance dI / dV is measured in the upper DQDs as a function of source ... [Phys. Rev. B 91, 245102] Published Tue Jun 02, 2015

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Virtual topological insulators with real quantized physics (2015)

Emil Prodan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Emil Prodan A concrete strategy is presented for generating strong topological insulators in d + d ′ dimensions which have quantized physics in d dimensions. Here, d counts the physical and d ′ the virtual dimensions. It consists of seeking d -dimensional representations of operator algebras which are usually define... [Phys. Rev. B 91, 245104] Published Wed Jun 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Microwave background polarization as a probe of large-angle correlations (2015)

Amanda Yoho, Simone Aiola, Craig J. Copi, Arthur Kosowsky, and Glenn D. Starkman

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Amanda Yoho, Simone Aiola, Craig J. Copi, Arthur Kosowsky, and Glenn D. Starkman Two-point correlation functions of cosmic microwave background polarization provide a physically independent probe of the surprising suppression of correlations in the cosmic microwave background temperature anisotropies at large angular scales. We investigate correlation functions constructed from ... [Phys. Rev. D 91, 123504] Published Thu Jun 04, 2015

Schlagwort(e): Cosmology

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Stabilizing the Planck mass shortly after inflation (2015)

Carsten van de Bruck, Adam Christopherson, and Mathew Robinson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Carsten van de Bruck, Adam Christopherson, and Mathew Robinson We consider a model of the early Universe which consists of two scalar fields: the inflaton and a second field which drives the stabilization of the Planck mass (or gravitational constant). We show that the nonminimal coupling of this second field to the Ricci scalar sources a nonadiabatic pressure ... [Phys. Rev. D 91, 123503] Published Wed Jun 03, 2015

Schlagwort(e): Cosmology

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Three-step approach for computing band offsets and its application to inorganic ABX_{3} halide perovskites (2015)

Li Lang, Yue-Yu Zhang, Peng Xu, Shiyou Chen, H. J. Xiang, and X. G. Gong

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Li Lang, Yue-Yu Zhang, Peng Xu, Shiyou Chen, H. J. Xiang, and X. G. Gong Band offsets between different semiconductors are important parameters that determine the electronic transport properties near the interface in the heterostructure devices. The computation of the natural band offset is a well-known challenge. In this paper, we propose a new method, which is called t… [Phys. Rev. B 92, 075102] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Patterns of electromagnetic response in topological semimetals (2015)

Srinidhi T. Ramamurthy and Taylor L. Hughes

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Srinidhi T. Ramamurthy and Taylor L. Hughes Topological semimetals are gapless states of matter which have robust and unique electromagnetic responses and surface states. In this paper, we consider semimetals which have pointlike Fermi surfaces in various spatial dimensions D = 1 , 2 , 3 which naturally occur in the transition between a weak topolo… [Phys. Rev. B 92, 085105] Published Mon Aug 03, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Running from features: Optimized evaluation of inflationary power spectra (2015)

Hayato Motohashi and Wayne Hu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Hayato Motohashi and Wayne Hu In models like axion monodromy, temporal features during inflation which are not associated with its ending can produce scalar, and to a lesser extent, tensor power spectra where deviations from scale-free power law spectra can be as large as the deviations from scale invariance itself. Here the sta… [Phys. Rev. D 92, 043501] Published Mon Aug 03, 2015

Schlagwort(e): Cosmology

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Nonlocality in uniaxially polarizable media (2015)

Maxim A. Gorlach and Pavel A. Belov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Maxim A. Gorlach and Pavel A. Belov We reveal extraordinary electromagnetic properties for a general class of uniaxially polarizable media. Depending on parameters, such metamaterials may have a wide range of nontrivial shapes of isofrequency contours including lemniscate, diamond, and multiply connected curves with connectivity numbe… [Phys. Rev. B 92, 085107] Published Tue Aug 04, 2015

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Enhanced conduction and ferromagnetic order at (100)-type twin walls in La_{0.7} Sr_{0.3} MnO_{3} thin films (2015)

Lluís Balcells, Markos Paradinas, Núria Baguès, Neus Domingo, Roberto Moreno, Regina Galceran, Michael Walls, José Santiso, Zorica Konstantinovic, Alberto Pomar, Marie-Jo Casanove, Carmen Ocal, Benjamín Martínez, and Felip Sandiumenge

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Lluís Balcells, Markos Paradinas, Núria Baguès, Neus Domingo, Roberto Moreno, Regina Galceran, Michael Walls, José Santiso, Zorica Konstantinovic, Alberto Pomar, Marie-Jo Casanove, Carmen Ocal, Benjamín Martínez, and Felip Sandiumenge There is increasing evidence supporting the strong potential of twin walls in ferroic materials as distinct, spatially tunable, functional elements in future electronic devices. Here, we report an increase of about one order of magnitude in conductivity and more robust magnetic interactions at (100)… [Phys. Rev. B 92, 075111] Published Fri Aug 07, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Beyond the GW approximation: A second-order screened exchange correction (2015)

Xinguo Ren, Noa Marom, Fabio Caruso, Matthias Scheffler, and Patrick Rinke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Xinguo Ren, Noa Marom, Fabio Caruso, Matthias Scheffler, and Patrick Rinke Motivated by the recently developed renormalized second-order perturbation theory for ground-state energy calculations, we propose a second-order screened exchange correction (SOSEX) to the G W self-energy. This correction follows the spirit of the SOSEX correction to the random-phase approximation f… [Phys. Rev. B 92, 081104(R)] Published Fri Aug 07, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Topological magnetoelectric effects in thin films of topological insulators (2015)

Takahiro Morimoto, Akira Furusaki, and Naoto Nagaosa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Takahiro Morimoto, Akira Furusaki, and Naoto Nagaosa The authors describe two theoretical setups that could be used to demonstrate the yet unobserved topological magnetoelectric effect. The first proposal employs the zero-filling quantum Hall effect in thin films under magnetic field. The second setup involves topological insulator thin films doped with two magnetic ions such as Cr and Mn. [Phys. Rev. B 92, 085113] Published Fri Aug 07, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Correlation effects on topological crystalline insulators (2015)

Tsuneya Yoshida and Akira Furusaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Tsuneya Yoshida and Akira Furusaki We study interaction effects on the topological crystalline insulators protected by time-reversal ( T ) and reflection symmetry ( R ) in two and three spatial dimensions. From the stability analysis of the edge states with bosonization, we find that the classification of the two-dimensional symmetry-pro… [Phys. Rev. B 92, 085114] Published Fri Aug 07, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Entanglement negativity after a local quantum quench in conformal field theories (2015)

Xueda Wen, Po-Yao Chang, and Shinsei Ryu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Xueda Wen, Po-Yao Chang, and Shinsei Ryu We study the time evolution of the entanglement negativity after a local quantum quench in (1 + 1)-dimensional conformal field theories (CFTs), which we introduce by suddenly joining two initially decoupled CFTs at their end points. We calculate the negativity evolution for both adjacent intervals a… [Phys. Rev. B 92, 075109] Published Thu Aug 06, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Determination of the Mott-Hubbard gap in GdTiO_{3} (2015)

L. Bjaalie, A. Verma, B. Himmetoglu, A. Janotti, S. Raghavan, V. Protasenko, E. H. Steenbergen, D. Jena, S. Stemmer, and C. G. Van de Walle

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. Bjaalie, A. Verma, B. Himmetoglu, A. Janotti, S. Raghavan, V. Protasenko, E. H. Steenbergen, D. Jena, S. Stemmer, and C. G. Van de Walle The band gaps of rare-earth titanates are commonly reported to be 0.2–0.7 eV. These values are based on optical reflectivity measurements, from which the onset of optical absorption is derived. Here we report experimental and theoretical results on GdTiO 3 (GTO) indicating that the gap is significant… [Phys. Rev. B 92, 085111] Published Thu Aug 06, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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First-principles study of magnetic properties in Fe-ladder compound BaFe_{2} S_{3} (2015)

Michi-To Suzuki, Ryotaro Arita, and Hiroaki Ikeda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Michi-To Suzuki, Ryotaro Arita, and Hiroaki Ikeda We study the magnetic, structural, and electronic properties of the recently discovered iron-based superconductor BaFe 2 S 3 based on density functional theory with the generalized gradient approximation. The calculations show that the magnetic alignment in which the spins are coupled ferromagnetically… [Phys. Rev. B 92, 085116] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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X-ray absorption K edge as a diagnostic of the electronic temperature in warm dense aluminum (2015)

F. Dorchies, F. Festa, V. Recoules, O. Peyrusse, A. Benuzzi-Mounaix, E. Brambrink, A. Levy, A. Ravasio, M. Koenig, T. Hall, and S. Mazevet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): F. Dorchies, F. Festa, V. Recoules, O. Peyrusse, A. Benuzzi-Mounaix, E. Brambrink, A. Levy, A. Ravasio, M. Koenig, T. Hall, and S. Mazevet The use of the x-ray absorption K -edge slope is investigated as a model-free diagnostic of the electronic temperature in warm dense matter. Data are reported for aluminum in a wide domain of densities (approximately one to three times the solid density) and temperatures ( ∼ 0.1 – 10 eV ). Measurements are… [Phys. Rev. B 92, 085117] Published Mon Aug 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Finite-temperature Gutzwiller approximation from the time-dependent variational principle (2015)

Nicola Lanatà, Xiaoyu Deng, and Gabriel Kotliar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Nicola Lanatà, Xiaoyu Deng, and Gabriel Kotliar We develop an extension of the Gutzwiller approximation to finite temperatures based on the Dirac-Frenkel variational principle. Our method does not rely on any entropy inequality, and is substantially more accurate than the approaches proposed in previous works. We apply our theory to the single-ba… [Phys. Rev. B 92, 081108(R)] Published Tue Aug 11, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Strong competition between Θ_{II} -loop-current order and d-wave charge order along the diagonal direction in a two-dimensional hot spot model (2015)

Vanuildo S. de Carvalho, Thomas Kloss, Xavier Montiel, Hermann Freire, and Catherine Pépin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Vanuildo S. de Carvalho, Thomas Kloss, Xavier Montiel, Hermann Freire, and Catherine Pépin We study the fate of the so-called Θ I I -loop-current order that breaks both time-reversal and parity symmetries in a two-dimensional hot spot model with antiferromagnetically mediated interactions, using Fermi surfaces relevant to the phenomenology of the cuprate superconductors. We start from a thre… [Phys. Rev. B 92, 075123] Published Fri Aug 14, 2015

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Spin versus charge noise from Kondo traps (2015)

Luis G. G. V. Dias da Silva and Rogério de Sousa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Luis G. G. V. Dias da Silva and Rogério de Sousa Magnetic and charge noise have a common microscopic origin in solid-state devices, as described by a universal electron trap model. In spite of this common origin, magnetic (spin) and charge noise spectral densities display remarkably different behaviors when many-particle correlations are taken int… [Phys. Rev. B 92, 085123] Published Fri Aug 14, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Low-temperature magnetic ordering and structural distortions in vanadium sesquioxide V_{2} O_{3} (2015)

Daniel Grieger and Michele Fabrizio

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Daniel Grieger and Michele Fabrizio Vanadium sesquioxide ( V 2 O 3 ) is an antiferromagnetic insulator below T N ≈ 155 K . The magnetic order does not consist of only antiferromagnetic nearest-neighbor bonds, possibly excluding the interplane vanadium pairs, as one would infer from the bipartite character of the hexagonal basal plane in the hig… [Phys. Rev. B 92, 075121] Published Mon Aug 10, 2015

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Fermi surface symmetry and evolution of the electronic structure across the paramagnetic-helimagnetic transition in MnSi/Si(111) (2015)

Alessandro Nicolaou, Matteo Gatti, Elena Magnano, Patrick Le Fèvre, Federica Bondino, François Bertran, Antonio Tejeda, Michèle Sauvage-Simkin, Alina Vlad, Yves Garreau, Alessandro Coati, Nicolas Guérin, Fulvio Parmigiani, and Amina Taleb-Ibrahimi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Alessandro Nicolaou, Matteo Gatti, Elena Magnano, Patrick Le Fèvre, Federica Bondino, François Bertran, Antonio Tejeda, Michèle Sauvage-Simkin, Alina Vlad, Yves Garreau, Alessandro Coati, Nicolas Guérin, Fulvio Parmigiani, and Amina Taleb-Ibrahimi MnSi has been extensively studied for five decades; nonetheless detailed information on the Fermi surface (FS) symmetry is still lacking. This missed information prevents a comprehensive understanding of the nature of the magnetic interaction in this material. Here, by performing angle-resolved phot… [Phys. Rev. B 92, 081110(R)] Published Tue Aug 11, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Influence of molecular conformations on the electronic structure of organic charge transfer salts (2015)

Daniel Guterding, Roser Valentí, and Harald O. Jeschke

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Daniel Guterding, Roser Valentí, and Harald O. Jeschke We report ab initio calculations for the electronic structure of organic charge transfer salts κ − ( ET ) 2 Cu [ N ( CN ) 2 ] Br , κ − ( ET ) 2 Cu [ N ( CN ) 2 ] I , κ ″ − ( ET ) 2 Cu [ N ( CN ) 2 ] Cl , and κ − ( ET ) 2 Cu 2 ( CN ) 3 . These materials show an ordering of the relative orientation of terminal ethylene groups in the bis-ethylenedithio-tetrat… [Phys. Rev. B 92, 081109(R)] Published Tue Aug 11, 2015

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Testing predictions from density functional theory at finite temperatures: β_{2} -like ground states in Co-Pt (2015)

Elizabeth Decolvenaere, Michael J. Gordon, and Anton Van der Ven

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Elizabeth Decolvenaere, Michael J. Gordon, and Anton Van der Ven We perform a critical assessment of the accuracy of density functional theory (DFT) based methods in predicting stable phases within the Co-Pt binary alloy. Statistical mechanical analysis applied to zero kelvin DFT predictions yields finite-temperature results that can be directly compared with exp… [Phys. Rev. B 92, 085119] Published Tue Aug 11, 2015

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Intermediate fixed point in a Luttinger liquid with elastic and dissipative backscattering (2015)

Alexander Altland, Yuval Gefen, and Bernd Rosenow

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Alexander Altland, Yuval Gefen, and Bernd Rosenow In a recent work [A. Altland, Y. Gefen, and B. Rosenow, Phys. Rev. Lett. 108 , 136401 (2012) ], we have addressed the problem of a Luttinger liquid with a scatterer that allows for both coherent and incoherent scattering channels. We have found that the physics associated with this model is qualitativ… [Phys. Rev. B 92, 085124] Published Fri Aug 14, 2015

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Double-expansion impurity solver for multiorbital models with dynamically screened U and J (2015)

Karim Steiner, Yusuke Nomura, and Philipp Werner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Karim Steiner, Yusuke Nomura, and Philipp Werner We present a continuous-time Monte Carlo impurity solver for multiorbital impurity models which combines a strong-coupling hybridization expansion and a weak-coupling expansion in the Hund's coupling parameter J . This double-expansion approach allows to treat the dominant density-density interaction… [Phys. Rev. B 92, 115123] Published Thu Sep 10, 2015

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Microscopic investigation of electronic inhomogeneity induced by substitutions in a quantum critical metal CeCoIn_{5} (2015)

H. Sakai, F. Ronning, J.-X. Zhu, N. Wakeham, H. Yasuoka, Y. Tokunaga, S. Kambe, E. D. Bauer, and J. D. Thompson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): H. Sakai, F. Ronning, J.-X. Zhu, N. Wakeham, H. Yasuoka, Y. Tokunaga, S. Kambe, E. D. Bauer, and J. D. Thompson Chemical substitutions are used commonly to tune a magnetic transition to zero temperature, but the resulting non-Fermi-liquid (NFL) behavior is nonuniversal. We have used nuclear quadrupole resonance to probe microscopically the response of a prototypical quantum critical metal CeCoIn 5 to substitut… [Phys. Rev. B 92, 121105(R)] Published Thu Sep 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Nonequilibrium electronic and phonon dynamics of Cu_{0.17} Bi_{2} Se_{3} investigated by core-level and valence-band time-resolved photoemission spectroscopy (2015)

T. Yamamoto, Y. Ishida, R. Yoshida, M. Okawa, K. Okazaki, T. Kanai, A. Kikkawa, Y. Taguchi, T. Kiss, K. Ishizaka, N. Ishii, J. Itatani, S. Watanabe, Y. Tokura, T. Saitoh, and S. Shin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): T. Yamamoto, Y. Ishida, R. Yoshida, M. Okawa, K. Okazaki, T. Kanai, A. Kikkawa, Y. Taguchi, T. Kiss, K. Ishizaka, N. Ishii, J. Itatani, S. Watanabe, Y. Tokura, T. Saitoh, and S. Shin We have performed time-resolved (TR) core-level and valence-band angle-resolved (AR) photoemission spectroscopy (PES) to investigate ultrafast dynamics of an electron-doped topological insulator Cu 0.17 Bi 2 Se 3 . The Bi 5 d 5 / 2 line was composed of a single peak and exhibited broadening upon both heating … [Phys. Rev. B 92, 121106(R)] Published Thu Sep 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Minimally entangled typical thermal states versus matrix product purifications for the simulation of equilibrium states and time evolution (2015)

Moritz Binder and Thomas Barthel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-11

Beschreibung: Author(s): Moritz Binder and Thomas Barthel For the simulation of equilibrium states and finite-temperature response functions of strongly correlated quantum many-body systems, we compare the efficiencies of two different approaches in the framework of the density matrix renormalization group (DMRG). The first is based on matrix product purif… [Phys. Rev. B 92, 125119] Published Thu Sep 10, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Spin-wave approach for entanglement entropies of the J_{1} −J_{2} Heisenberg antiferromagnet on the square lattice (2015)

Nicolas Laflorencie, David J. Luitz, and Fabien Alet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-12

Beschreibung: Author(s): Nicolas Laflorencie, David J. Luitz, and Fabien Alet Using a modified spin-wave theory which artificially restores zero sublattice magnetization on finite lattices, we investigate the entanglement properties of the Néel ordered J 1 − J 2 Heisenberg antiferromagnet on the square lattice. Different kinds of subsystem geometries are studied, either corner-fr… [Phys. Rev. B 92, 115126] Published Fri Sep 11, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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General analysis of direct dark matter detection: From microphysics to observational signatures (2015)

James B. Dent, Lawrence M. Krauss, Jayden L. Newstead, and Subir Sabharwal

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2015-09-15

Beschreibung: Author(s): James B. Dent, Lawrence M. Krauss, Jayden L. Newstead, and Subir Sabharwal Beginning with a set of simplified models for spin-0, spin- 1 2 , and spin-1 dark matter candidates, we derive the full set of nonrelativistic operators and nuclear matrix elements relevant for direct detection of dark matter and use these to calculate rates and recoil spectra for scattering on various… [Phys. Rev. D 92, 063515] Published Mon Sep 14, 2015

Schlagwort(e): Cosmology

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

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Suppression of orbital ordering by chemical pressure in FeSe_{1−x} S_{x} (2015)

M. D. Watson, T. K. Kim, A. A. Haghighirad, S. F. Blake, N. R. Davies, M. Hoesch, T. Wolf, and A. I. Coldea

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): M. D. Watson, T. K. Kim, A. A. Haghighirad, S. F. Blake, N. R. Davies, M. Hoesch, T. Wolf, and A. I. Coldea We report a high-resolution angle-resolved photoemission spectroscopy study of the evolution of the electronic structure of FeSe 1 − x S x single crystals. Isovalent S substitution onto the Se site constitutes a chemical pressure which subtly modifies the electronic structure of FeSe at high temperatures… [Phys. Rev. B 92, 121108(R)] Published Tue Sep 15, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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Surface calculations with asymptotically long-ranged potentials in the full-potential linearized augmented plane-wave method (2015)

Lin-Hui Ye

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-09-16

Beschreibung: Author(s): Lin-Hui Ye Although the supercell method has been widely used for surface calculations, it only works well with short-ranged potentials, but meets difficulty when the potential decays very slowly into the vacuum. Unfortunately, the exact exchange-correlation potential of the density functional theory is asympt… [Phys. Rev. B 92, 115132] Published Tue Sep 15, 2015

Schlagwort(e): Electronic structure and strongly correlated systems

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