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Quantification of bone surface textures: exploring a new method of ontogenetic ageing (2023)

Rooij, J. (Jimmy) de ; Vintges, Marleen Q. ; Zuidwijk, Thim ; [weitere]

In: Journal of Analytical Science and Technology vol. 14 no. 1

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Publikationsdatum: 2024-02-26

Beschreibung: Identifcation of ontogenetic age classes plays an important role in the felds of zoology, palaeontology and archaeology, where accurate age classifcations of (sub)fossil remains are a crucial component for the reconstruction \nof past life. Textural ageing\xe2\x80\x94the identifcation of age-related bone surface textures\xe2\x80\x94provides a size-independent \nmethod for age assessment of vertebrate material. However, most of the work so far is limited to qualitative results. \nWhile qualitative approaches provide helpful insights on textural ageing patterns, they are heavily subject to observer \nbias and fall short of quantitative data relevant for detailed statistical analyses and cross-comparisons. Here, we present a pilot study on the application of 3D surface digital microscopy to quantify bone surface textures on the long \nbones of the grey heron (Ardea cinerea) and the Canada goose (Branta canadensis) using internationally verifed \nroughness parameters. Using a standardised measuring protocol, computed roughness values show a strong correlation with qualitative descriptions of textural patterns. Overall, higher roughness values correspond to increased numbers of grooves and pits and vice versa. Most of the roughness parameters allowed distinguishing between diferent \nontogenetic classes and closely followed the typical sigmoidal animal growth curve. Our results show that bone \ntexture quantifcation is a feasible approach to identifying ontogenetic age classes.

Schlagwort(e): General Physics and Astronomy ; General Environmental Science ; General Biochemistry ; Genetics and Molecular Biology ; General Materials Science ; General Chemistry ; Roughness ; Surfaces ; Taphonomy ; Topography ; Bone ; Ontogeny ; Digital microscopy

Repository-Name: National Museum of Natural History, Netherlands

Materialart: info:eu-repo/semantics/article

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Frontiers in Chemistry: Rising Stars (2021)

Frontiers Media SA

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Publikationsdatum: 2024-04-04

Beschreibung: The Frontiers in Chemistry Editorial Office team are delighted to present the inaugural “Frontiers in Chemistry: Rising Stars” article collection, showcasing the high-quality work of internationally recognized researchers in the early stages of their independent careers. All Rising Star researchers featured within this collection were individually nominated by the Journal’s Chief Editors in recognition of their potential to influence the future directions in their respective fields. The work presented here highlights the diversity of research performed across the entire breadth of the chemical sciences, and presents advances in theory, experiment and methodology with applications to compelling problems. This Editorial features the corresponding author(s) of each paper published within this important collection, ordered by section alphabetically, highlighting them as the great researchers of the future. The Frontiers in Chemistry Editorial Office team would like to thank each researcher who contributed their work to this collection. We would also like to personally thank our Chief Editors for their exemplary leadership of this article collection; their strong support and passion for this important, community-driven collection has ensured its success and global impact.

Schlagwort(e): Green and Sustainable Chemistry ; Analytical Chemistry ; Theoretical and Computational Chemistry ; Polymer Chemistry ; Medicinal and Pharmaceutical Chemistry ; Organic Chemistry ; Nanoscience ; Catalysis and Photocatalysis ; Supramolecular Chemistry ; Electrochemistry ; Inorganic Chemistry ; Chemical Biology ; thema EDItEUR::P Mathematics and Science::PD Science: general issues

Sprache: Englisch

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Hierarchical stripe phases in IrTe_{2} driven by competition between Ir dimerization and Te bonding (2014)

Jixia Dai, Kristjan Haule, J. J. Yang, Y. S. Oh, S-W. Cheong, and Weida Wu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Jixia Dai, Kristjan Haule, J. J. Yang, Y. S. Oh, S-W. Cheong, and Weida Wu Layered 5d transition metal dichalcogenide (TMD) IrTe 2 is distinguished from the traditional TMDs (such as NbSe 2 ) by the existence of multiple charge-density wave (CDW)-like stripe phases and superconductivity at low temperatures. Despite intensive studies, there is still no consensus on the physica... [Phys. Rev. B 90, 235121] Published Thu Dec 11, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Self-organized electronic superlattices in layered materials (2014)

Carmine Ortix, Carlo Di Castro, and José Lorenzana

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Carmine Ortix, Carlo Di Castro, and José Lorenzana We show that in layered systems with electronic phase separation tendency, the long-range Coulomb interaction can drive the spontaneous formation of unidirectional superlattices of electronic charge in a completely homogeneous crystalline background. In this self-organized electronic heterostructure... [Phys. Rev. B 90, 241110] Published Mon Dec 15, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Resonating valence-bond physics on the honeycomb lattice (2014)

Pranay Patil, Ishita Dasgupta, and Kedar Damle

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Pranay Patil, Ishita Dasgupta, and Kedar Damle We study bond and spin correlations of the nearest-neighbor resonating valence bond (RVB) wave function for a SU(2) symmetric S=1/2 antiferromagnet on the honeycomb lattice. We find that spin correlations in this wave function are short ranged, while the bond energy correlation function takes on an ... [Phys. Rev. B 90, 245121] Published Mon Dec 15, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Real-time dynamics in the one-dimensional Hubbard model (2014)

Luis Seabra, Fabian H. L. Essler, Frank Pollmann, Imke Schneider, and Thomas Veness

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Luis Seabra, Fabian H. L. Essler, Frank Pollmann, Imke Schneider, and Thomas Veness We consider single-particle properties in the one-dimensional repulsive Hubbard model at commensurate fillings in the metallic phase. We determine the real-time evolution of the retarded Green's function by matrix-product state methods. We find that at sufficiently late times the numerical results a... [Phys. Rev. B 90, 245127] Published Tue Dec 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Variational description of the ground state of the repulsive two-dimensional Hubbard model in terms of nonorthogonal symmetry-projected Slater determinants (2014)

R. Rodríguez-Guzmán, Carlos A. Jiménez-Hoyos, and Gustavo E. Scuseria

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): R. Rodríguez-Guzmán, Carlos A. Jiménez-Hoyos, and Gustavo E. Scuseria The few-determinant (FED) methodology, introduced in our previous works [R. Rodríguez-Guzmán et al. , Phys. Rev. B 87 , 235129 (2013);PRBMDO10.1103/PhysRevB.87.235129 Phys. Rev. B 89 , 195109 (2014)PRBMDO10.1103/PhysRevB.89.195109] for one-dimensional (1D) lattices, is here adapted for the repulsive tw... [Phys. Rev. B 90, 195110] Published Fri Nov 07, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Memory effect in a ferroelectric single-electron transistor: Violation of conductance periodicity in the gate voltage (2014)

S. A. Fedorov, A. E. Korolkov, N. M. Chtchelkatchev, O. G. Udalov, and I. S. Beloborodov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): S. A. Fedorov, A. E. Korolkov, N. M. Chtchelkatchev, O. G. Udalov, and I. S. Beloborodov A fundamental property of most single-electron devices with a quasicontinuous quasiparticle spectrum on an island is the periodicity of their transport characteristics in a gate voltage. This property is robust even with respect to placing ferroelectric insulators in the source and drain tunnel junc... [Phys. Rev. B 90, 195111] Published Fri Nov 07, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Beyond Planck-Einstein quanta: Amplitude-driven quantum excitation (2014)

Wen Shen, T. P. Devereaux, and J. K. Freericks

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): Wen Shen, T. P. Devereaux, and J. K. Freericks Linear-response quantum excitation is proportional to the amplitude of the field, with the energy of the excitation given by the driving frequency. As the amplitude is increased, there is a crossover, where the excitation energy is governed by the amplitude of the driving field, not its frequency. A... [Phys. Rev. B 90, 195104] Published Tue Nov 04, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Nontrivial Z2 topology in bismuth-based III-V compounds (2014)

Huaqing Huang, Jianpeng Liu, and Wenhui Duan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): Huaqing Huang, Jianpeng Liu, and Wenhui Duan Realizing topological insulators in commonly used III-V semiconductors is of great importance for their potential application in spintronics and quantum computing. Here we propose a general strategy to realize topological insulators in conventional III-V semiconductors by bismuth substitution and ex... [Phys. Rev. B 90, 195105] Published Tue Nov 04, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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NMR studies of ordered structures and valence states in the successive valence-transition system EuPtP (2014)

T. Mito, K. Nishitani, T. Koyama, H. Muta, T. Maruyama, G. Pristáš, K. Ueda, T. Kohara, A. Mitsuda, M. Sugishima, and H. Wada

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): T. Mito, K. Nishitani, T. Koyama, H. Muta, T. Maruyama, G. Pristáš, K. Ueda, T. Kohara, A. Mitsuda, M. Sugishima, and H. Wada We have studied EuPtP, which undergoes two successive valence transitions at TA∼240 K and TB∼200 K by P31-nuclear magnetic resonance (NMR) measurements. From the analysis of NMR spectra, we obtained plausible ordered structures and Eu valence states in three phases divided by TA and TB. These ordere... [Phys. Rev. B 90, 195106] Published Tue Nov 04, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Spin-orbit coupling and electronic charge effects in Mott insulators (2014)

Shan Zhu, You-Quan Li, and Cristian D. Batista

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): Shan Zhu, You-Quan Li, and Cristian D. Batista We derive the effective charge- and current-density operators for the strong-coupling limit of a single-band Mott insulator in the presence of spin-orbit coupling and show that the spin-orbit contribution to the effective charge density leads to novel mechanisms for multiferroic behavior. In some se... [Phys. Rev. B 90, 195107] Published Tue Nov 04, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Commensurate and incommensurate states of topological quantum matter (2014)

Ashley Milsted, Emilio Cobanera, Michele Burrello, and Gerardo Ortiz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Ashley Milsted, Emilio Cobanera, Michele Burrello, and Gerardo Ortiz We prove numerically and by dualities the existence of modulated, commensurate and incommensurate states of topological quantum matter in systems of parafermions, motivated by recent proposals for the realization of such systems in mesoscopic arrays. In two space dimensions, we obtain the simplest r... [Phys. Rev. B 90, 195101] Published Mon Nov 03, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Structural versus electronic distortions in IrTe2 with broken symmetry (2014)

Hyo Sung Kim, Tae-Hwan Kim, Junjie Yang, Sang-Wook Cheong, and Han Woong Yeom

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Hyo Sung Kim, Tae-Hwan Kim, Junjie Yang, Sang-Wook Cheong, and Han Woong Yeom We investigate atomic and electronic structures of the intriguing low-temperature phase of IrTe2 using high-resolution scanning tunneling microscopy and spectroscopy. We confirm various stripe superstructures such as ×3, ×5, and ×8. The strong vertical and lateral distortions of the lattice for the ... [Phys. Rev. B 90, 201103] Published Wed Nov 05, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Block Lanczos density-matrix renormalization group method for general Anderson impurity models: Application to magnetic impurity problems in graphene (2014)

Tomonori Shirakawa and Seiji Yunoki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Tomonori Shirakawa and Seiji Yunoki We introduce a block Lanczos (BL) recursive technique to construct quasi-one-dimensional models, suitable for density-matrix renormalization group (DMRG) calculations, from single- as well as multiple-impurity Anderson models in any spatial dimensions. This new scheme, named BL-DMRG method, allows u... [Phys. Rev. B 90, 195109] Published Wed Nov 05, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Semiclassical evidence of columnar order in the fully frustrated transverse-field Ising model on the square lattice (2014)

Tommaso Coletta, Sergey E. Korshunov, and Frédéric Mila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Tommaso Coletta, Sergey E. Korshunov, and Frédéric Mila We investigate the zero-temperature phase diagram of the fully frustrated transverse-field Ising model on the square lattice both in the classical limit and in the presence of quantum fluctuations. At the classical level (the limit of infinite spin S), we find that upon decreasing the transverse fie... [Phys. Rev. B 90, 205109] Published Wed Nov 05, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Floquet-Bloch analysis of refracting Huygens metasurfaces (2014)

Ariel Epstein and George V. Eleftheriades

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Ariel Epstein and George V. Eleftheriades We investigate the response of passive lossless Huygens metasurfaces (HMS), designed to implement a prescribed refraction, to arbitrary plane-wave excitations. Applying a rigorous Floquet-Bloch (FB) analysis of the cotangent electric and magnetic surface reactance modulations, we discover that the s... [Phys. Rev. B 90, 235127] Published Tue Dec 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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One-way absorption of terahertz waves in rod-type and multilayer structures containing polar dielectrics (2014)

Andriy E. Serebryannikov, Shunji Nojima, and Ekmel Ozbay

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Andriy E. Serebryannikov, Shunji Nojima, and Ekmel Ozbay One-way absorption can be obtained at terahertz frequencies in low-profile rod-type and multilayer dielectric structures with broken spatial inversion symmetry, which contain either a rod layer or an ultrathin homogeneous layer made of a polar dielectric. Perfect absorption for one of the two opposi... [Phys. Rev. B 90, 235126] Published Tue Dec 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Direct experimental evidence of multiferroicity in a nanocrystalline Zener polaron ordered manganite (2014)

Vinay Kumar Shukla, Soumik Mukhopadhyay, Kalipada Das, A. Sarma, and I. Das

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Vinay Kumar Shukla, Soumik Mukhopadhyay, Kalipada Das, A. Sarma, and I. Das We discuss the particle size driven tunability of the coexistence of ferromagnetism and ferroelectricity in Pr 0.67 Ca 0.33 MnO 3 (PCMO) with the help of x-ray diffraction, magnetization, impedance spectroscopy, and remanent polarization measurements. The remanent polarization measurements using the “pos... [Phys. Rev. B 90, 245126] Published Tue Dec 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Laser-induced charge-disproportionated metallic state in LaCoO_{3} (2014)

M. Izquierdo, M. Karolak, C. Trabant, K. Holldack, A. Föhlisch, K. Kummer, D. Prabhakaran, A. T. Boothroyd, M. Spiwek, A. Belozerov, A. Poteryaev, A. Lichtenstein, and S. L. Molodtsov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): M. Izquierdo, M. Karolak, C. Trabant, K. Holldack, A. Föhlisch, K. Kummer, D. Prabhakaran, A. T. Boothroyd, M. Spiwek, A. Belozerov, A. Poteryaev, A. Lichtenstein, and S. L. Molodtsov Understanding the origin of the spin transition in LaCoO 3 is one of the long-standing aims in condensed matter physics. Aside from its fundamental interest, a detailed description of this crossover will have a direct impact on the interpretation of the semiconductor-to-metal transition (SMT) and the... [Phys. Rev. B 90, 235128] Published Wed Dec 17, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Transport in a hybrid normal metal/topological superconductor Kondo model (2014)

Razvan Chirla, I. V. Dinu, V. Moldoveanu, and Cătălin Paşcu Moca

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Razvan Chirla, I. V. Dinu, V. Moldoveanu, and Cătălin Paşcu Moca We investigate the equilibrium and nonequilibrium transport through a quantum dot in the Kondo regime, embedded between a normal metal and a topological superconductor supporting Majorana bound states at its end points. We find that the Kondo physics is significantly modified by the presence of the ... [Phys. Rev. B 90, 195108] Published Wed Nov 05, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Anomalous entanglement in chaotic Dirac billiards (2014)

J. G. G. S. Ramos, I. M. L. da Silva, and A. L. R. Barbosa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): J. G. G. S. Ramos, I. M. L. da Silva, and A. L. R. Barbosa We present analytical and numerical results that demonstrate the presence of anomalous entanglement behavior on the Dirac Billiards. We investigate the statistical distribution of the characteristic entangled measures, focusing on the mean, on the variance, and on the quantum interference terms. We ... [Phys. Rev. B 90, 245107] Published Mon Dec 01, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Conformal field theories at nonzero temperature: Operator product expansions, Monte Carlo, and holography (2014)

Emanuel Katz, Subir Sachdev, Erik S. Sørensen, and William Witczak-Krempa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Emanuel Katz, Subir Sachdev, Erik S. Sørensen, and William Witczak-Krempa Strongly correlated quantum critical points with conformal symmetry in two spatial dimensions describe many phase transitions in condensed matter systems, as for example that from superfluid to insulator. Combining field theory methods, Monte Carlo simulations, and the holographic duality from string theory, the authors use an operator product expansion to derive non-perturbative results for these systems, including the leading terms in the frequency dependence of the nonzero temperature conductivity and sum rules obeyed by the conductivity. These methods and results are applicable to a wide class of conformal field theories for condensed matter systems. [Phys. Rev. B 90, 245109] Published Mon Dec 01, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Determination of Fermi contour and spin polarization of ν=3/2 composite fermions via ballistic commensurability measurements (2014)

D. Kamburov, M. A. Mueed, I. Jo, Yang Liu, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J. D. Lee, and R. Winkler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): D. Kamburov, M. A. Mueed, I. Jo, Yang Liu, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J. D. Lee, and R. Winkler In the composite fermions (CF) framework, at filling factor ν = 3/2 each carrier pairs up with two flux quanta to form quasi particles. The flux attachment cancels the external field, leaving the CFs as if they are at zero field — they occupy a Fermi sea with a well-defined Fermi contour. To examine this contour and its anisotropy induced by in-plane magnetic field, the authors apply the method of periodic grating of Hall bar samples, previously used by them in studies of CF near the filling factor 1/2. It is found that CF spin polarization increases with increasing quantum well width and electron density, and that in-plane magnetic field induces a larger CF Fermi contour anisotropy near filling factor 3/2 than near 1/2. [Phys. Rev. B 90, 235108] Published Tue Dec 02, 2014

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Real-time simulation of large open quantum spin systems driven by dissipation (2014)

D. Banerjee, F.-J. Jiang, M. Kon, and U.-J. Wiese

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): D. Banerjee, F.-J. Jiang, M. Kon, and U.-J. Wiese We consider a large quantum system with spins 1/2 whose dynamics is driven entirely by measurements of the total spin of spin pairs. This gives rise to a dissipative coupling to the environment. When one averages over the measurement results, the corresponding real-time path integral does not suffer... [Phys. Rev. B 90, 241104] Published Tue Dec 02, 2014

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CPT theorem and classification of topological insulators and superconductors (2014)

Chang-Tse Hsieh, Takahiro Morimoto, and Shinsei Ryu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Chang-Tse Hsieh, Takahiro Morimoto, and Shinsei Ryu We present a systematic topological classification of fermionic and bosonic topological phases protected by time-reversal, particle-hole, parity, and combination of these symmetries. We use two complementary approaches: one in terms of K-theory classification of gapped quadratic fermion theories wit... [Phys. Rev. B 90, 245111] Published Wed Dec 03, 2014

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Z_{3} symmetry-protected topological phases in the SU(3) AKLT model (2014)

Takahiro Morimoto, Hiroshi Ueda, Tsutomu Momoi, and Akira Furusaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Takahiro Morimoto, Hiroshi Ueda, Tsutomu Momoi, and Akira Furusaki We study Z 3 symmetry-protected topological (SPT) phases in one-dimensional spin systems with Z 3 ×Z 3 symmetry. We construct ground-state wave functions of the matrix product form for nontrivial Z 3 phases and their parent Hamiltonian from a cocycle of the group cohomology H 2 (Z 3 ×Z 3 ,U(1)). The Hamiltonia... [Phys. Rev. B 90, 235111] Published Thu Dec 04, 2014

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Excitonic condensation of strongly correlated electrons: The case of Pr_{0.5}Ca_{0.5}CoO_{3} (2014)

Jan Kuneš and Pavel Augustinský

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Jan Kuneš and Pavel Augustinský We use a combination of dynamical mean-field model calculations and LDA + U material specific calculations to investigate the low temperature phase transition in the compounds from the (Pr 1−y R y ) x Ca 1−x CoO 3 (R=Nd, Sm, Eu, Gd, Tb, Y) family (PCCO). The transition, marked by a sharp peak in the specific... [Phys. Rev. B 90, 235112] Published Thu Dec 04, 2014

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Possible triplet p+ip superconductivity in graphene at low filling (2014)

Tianxing Ma, Fan Yang, Hong Yao, and Hai-Qing Lin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Tianxing Ma, Fan Yang, Hong Yao, and Hai-Qing Lin We study the Hubbard model on the honeycomb lattice with nearest-neighbor hopping (t〉0) and next-nearest-neighbor hopping (t ′ 〈0). When t ′ 〈−t/6, the single-particle spectrum is featured by the continuously distributed Van Hove saddle points at the band bottom, where the density of states div... [Phys. Rev. B 90, 245114] Published Thu Dec 04, 2014

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Comparative study of low-temperature x-ray diffraction experiments on R_{2}Ir_{2}O_{7} (R=Nd, Eu, and Pr) (2014)

Hiroshi Takatsu, Kunihiko Watanabe, Kazuki Goto, and Hiroaki Kadowaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Hiroshi Takatsu, Kunihiko Watanabe, Kazuki Goto, and Hiroaki Kadowaki The cubic symmetry of pyrochlore iridium oxides R 2 Ir 2 O 7 (R=Nd, Eu, and Pr) has been investigated by high resolution x-ray diffraction experiments down to 4 K, in order to clarify the relationship between the metal-insulator transition (MIT) and the small structural phase transition suggested by Rama... [Phys. Rev. B 90, 235110] Published Thu Dec 04, 2014

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Pressure-induced valence change of YbNiGe3 investigated by resonant x-ray emission spectroscopy at the Yb L3 edge (2014)

Hitoshi Sato, Hitoshi Yamaoka, Yuki Utsumi, Heisuke Nagata, Marcos A. Avila, Raquel A. Ribeiro, Kazunori Umeo, Toshiro Takabatake, Yumiko Zekko, Jun'ichiro Mizuki, Jung-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Hirofumi Namatame, and Masaki Taniguchi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Hitoshi Sato, Hitoshi Yamaoka, Yuki Utsumi, Heisuke Nagata, Marcos A. Avila, Raquel A. Ribeiro, Kazunori Umeo, Toshiro Takabatake, Yumiko Zekko, Jun'ichiro Mizuki, Jung-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, Hirofumi Namatame, and Masaki Taniguchi Pressure dependence of the Yb valence in YbNiGe3 has been investigated up to 15.6 GPa at 300 K and up to 7.7 GPa at 17 K by means of x-ray absorption spectroscopy in Lα1 partial fluorescence yield mode and resonant x-ray emission spectroscopy around the Yb L3 absorption edge. The Yb valence in YbNiG... [Phys. Rev. B 89, 045112] Published Fri Jan 10, 2014

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Low-energy properties of fractional helical Luttinger liquids (2014)

Tobias Meng, Lars Fritz, Dirk Schuricht, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Tobias Meng, Lars Fritz, Dirk Schuricht, and Daniel Loss We investigate the low-energy properties of (quasi) helical and fractional helical Luttinger liquids. In particular, we calculate the Drude peak of the optical conductivity, the density of states, as well as charge transport properties of the interacting system with and without attached Fermi liquid... [Phys. Rev. B 89, 045111] Published Fri Jan 10, 2014

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Magnetophotonic intensity effects in hybrid metal-dielectric structures (2014)

V. I. Belotelov, L. E. Kreilkamp, A. N. Kalish, I. A. Akimov, D. A. Bykov, S. Kasture, V. J. Yallapragada, Achanta Venu Gopal, A. M. Grishin, S. I. Khartsev, M. Nur-E-Alam, M. Vasiliev, L. L. Doskolovich, D. R. Yakovlev, K. Alameh, A. K. Zvezdin, and M. Bayer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): V. I. Belotelov, L. E. Kreilkamp, A. N. Kalish, I. A. Akimov, D. A. Bykov, S. Kasture, V. J. Yallapragada, Achanta Venu Gopal, A. M. Grishin, S. I. Khartsev, M. Nur-E-Alam, M. Vasiliev, L. L. Doskolovich, D. R. Yakovlev, K. Alameh, A. K. Zvezdin, and M. Bayer The magneto-optical properties of a hybrid metal-dielectric structure consisting of a one-dimensional gold grating on top of a magnetic waveguide layer are studied experimentally and theoretically. It is demonstrated that a magnetic field applied in the longitudinal configuration (in the plane of th... [Phys. Rev. B 89, 045118] Published Tue Jan 14, 2014

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Spin-density-wave ordering in Ca0.5Sr1.5RuO4 studied by neutron scattering (2014)

S. Kunkemöller, A. A. Nugroho, Y. Sidis, and M. Braden

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): S. Kunkemöller, A. A. Nugroho, Y. Sidis, and M. Braden The spin-density-wave ordering in Ca0.5Sr1.5RuO4 was studied by polarized and unpolarized neutron diffraction experiments. Below about 20 K Ca0.5Sr1.5RuO4 exhibits quasistatic correlations at exactly the incommensurate wave vector at which pure Sr2RuO4 shows strong inelastic fluctuations driven by F... [Phys. Rev. B 89, 045119] Published Tue Jan 14, 2014

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Superconductivity in the two-dimensional t-t′-Hubbard model (2014)

Andreas Eberlein and Walter Metzner

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Andreas Eberlein and Walter Metzner Using a recently developed renormalization group method for fermionic superfluids, we determine conditions for d-wave superconductivity in the ground state of the two-dimensional Hubbard model at moderate interaction strength, and we compute the pairing gap in the superconducting regime. A pairing i... [Phys. Rev. B 89, 035126] Published Fri Jan 17, 2014

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Surface density of states of layered f-electron materials (2014)

Robert Peters and Norio Kawakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Robert Peters and Norio Kawakami We theoretically analyze the surface density of states of heavy fermion materials such as CeCoIn5. Recent experimental progress has made it possible to locally probe the formation of heavy quasiparticles in these systems via scanning tunneling microscopy, in which strongly temperature-dependent reso... [Phys. Rev. B 89, 041106] Published Fri Jan 17, 2014

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Hartree-Fock computation of the high-Tc cuprate phase diagram (2014)

R. B. Laughlin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): R. B. Laughlin A computation of the cuprate phase diagram is presented. Adiabatic deformability back to the density function band structure plus symmetry constraints lead to a Fermi liquid theory with five interaction parameters. Two of these are forced to zero by experiment. The remaining three are fit to the mom... [Phys. Rev. B 89, 035134] Published Wed Jan 22, 2014

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Exact zero modes and decoherence in systems of interacting Majorana fermions (2014)

Guang Yang and D. E. Feldman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Guang Yang and D. E. Feldman Majorana fermions often coexist with other low-energy fermionic degrees of freedom. In such a situation, topological quantum computation requires the use of fermionic zero modes of a many-body system. We classify all such modes for interacting fermions and show how to select the mode that maximizes ... [Phys. Rev. B 89, 035136] Published Wed Jan 22, 2014

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Magnetic-field-induced transitions and evolution of magnetotransport properties in quasi-two-dimensional KMo6O17 in the charge-density-wave phase (2014)

J.-F. Wang, M. Yang, L. Li, M. Sasaki, A. Ohnishi, M. Kitaura, K.-S. Kim, and Heon-Jung Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): J.-F. Wang, M. Yang, L. Li, M. Sasaki, A. Ohnishi, M. Kitaura, K.-S. Kim, and Heon-Jung Kim Longitudinal magnetoresistivity ρxx(B) and Hall resistivity ρxy(B) of KMo6O17 single crystals have been measured up to 60 T in a pulse magnet. Remarkable and unusual features at characteristic magnetic fields were found in both ρxx(B) and ρxy(B), which were attributed to Fermi surface reconstruction... [Phys. Rev. B 89, 035137] Published Thu Jan 23, 2014

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Induced tunneling and localization for a quantum particle in tilted two-dimensional lattices (2014)

Evgeny N. Bulgakov and Andrey R. Kolovsky

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Evgeny N. Bulgakov and Andrey R. Kolovsky We consider a quantum particle in tilted two-dimensional lattices in the tight-binding approximations. We show that for certain lattice geometries the particle can freely move across the lattice in the direction perpendicular to the vector of the static force. This effect is argued to be analog of t... [Phys. Rev. B 89, 035116] Published Mon Jan 13, 2014

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Stability of surface states of weak Z2 topological insulators and superconductors (2014)

Takahiro Morimoto and Akira Furusaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Takahiro Morimoto and Akira Furusaki We study the stability against disorder of surface states of weak Z2 topological insulators (superconductors) which are stacks of strong Z2 topological insulators (superconductors), considering representative Dirac Hamiltonians in the Altland-Zirnbauer symmetry classes in various spatial dimensions.... [Phys. Rev. B 89, 035117] Published Mon Jan 13, 2014

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Physical bounds on absorption and scattering for cloaked sensors (2014)

Romain Fleury, Jason Soric, and Andrea Alù

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Romain Fleury, Jason Soric, and Andrea Alù We derive and discuss general physical bounds on the electromagnetic scattering and absorption of passive structures. Our theory, based on passivity and power conservation, quantifies the minimum and maximum allowed scattering for an object that absorbs a given level of power. We show that there is ... [Phys. Rev. B 89, 045122] Published Wed Jan 15, 2014

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Magnetopolaron-induced optical response in transition metal oxides (2014)

J. M. Caicedo, J. Fontcuberta, and G. Herranz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): J. M. Caicedo, J. Fontcuberta, and G. Herranz We report on the optical response of different magnetic oxides (manganites, ruthenates, and magnetite) and show that for photons with energies ≈1.5−3.5 eV the intensity of light reflected by these epitaxial oxide thin films is strongly modulated by magnetic fields. We argue that this behavior is rel... [Phys. Rev. B 89, 045121] Published Wed Jan 15, 2014

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Ground-state uniqueness of the twelve-site RVB spin-liquid parent Hamiltonian on the kagome lattice (2014)

Zhenyu Zhou, Julia Wildeboer, and Alexander Seidel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Zhenyu Zhou, Julia Wildeboer, and Alexander Seidel Anderson's idea of a (short-ranged) resonating valence bond (RVB) spin liquid has been the first ever proposal of what we now call a topologically ordered phase. Since then, a wealth of exactly solvable lattice models have been constructed that have topologically ordered ground states. For a long ti... [Phys. Rev. B 89, 035123] Published Thu Jan 16, 2014

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Anderson impurity in the bulk of topological insulators (2014)

Igor Kuzmenko, Yshai Avishai, and Tai Kai Ng

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Igor Kuzmenko, Yshai Avishai, and Tai Kai Ng When an Anderson impurity is immersed in the bulk of a topological insulator that has an “inverted-Mexican-hat” band dispersion, a Kondo resonant peak appears simultaneously with an in-gap bound state. The latter generates another spin state thereby screening the Kondo effect. Using a weak-coupling ... [Phys. Rev. B 89, 035125] Published Fri Jan 17, 2014

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Structure factor of interacting one-dimensional helical systems (2014)

Suhas Gangadharaiah, Thomas L. Schmidt, and Daniel Loss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): Suhas Gangadharaiah, Thomas L. Schmidt, and Daniel Loss We calculate the dynamical structure factor S(q,ω) of a weakly interacting helical edge state in the presence of a magnetic field B. The latter opens a gap of width 2B in the single-particle spectrum, which becomes strongly nonlinear near the Dirac point. For chemical potentials |μ|〉B, the system... [Phys. Rev. B 89, 035131] Published Tue Jan 21, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Wigner-Mott insulator-to-insulator transition at pressure in charge-ordered Fe2OBO3 (2014)

G. Diguet, G. R. Hearne, W. N. Sibanda, E. Carleschi, P. Musyimi, V. Pischedda, and J. P. Attfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): G. Diguet, G. R. Hearne, W. N. Sibanda, E. Carleschi, P. Musyimi, V. Pischedda, and J. P. Attfield Magnetic-electronic studies of mixed-valence Fe2OBO3 have shown that ionic charge order (CO) is disrupted at ∼16 GPa. The pertinent minority-spin carrier exhibits persistent intersite electron exchange Fe2+ ⇔ Fe3+ to well beyond this pressure. Temperature-dependent electrical transport measurements ... [Phys. Rev. B 89, 035132] Published Tue Jan 21, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Existence of anisotropic spin fluctuations at low temperature in the normal phase of the superconducting ferromagnet UCoGe (2014)

M. Taupin, L. Howald, D. Aoki, J. Flouquet, and J. P. Brison

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-22

Beschreibung: Author(s): M. Taupin, L. Howald, D. Aoki, J. Flouquet, and J. P. Brison Thermal conductivity measurements have been performed on the superconducting ferromagnet UCoGe down to very low temperature and under magnetic field. In addition to the electronic quasiparticle thermal conductivity, additional contributions to the thermal transport are detected: they are sensitive t... [Phys. Rev. B 89, 041108] Published Tue Jan 21, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Strong local lattice instability in hexagonal ferrites RFe2O4 (R = Lu,Y,Yb) revealed by x-ray absorption spectroscopy (2014)

Sara Lafuerza, Joaquín García, Gloria Subías, Javier Blasco, and Vera Cuartero

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Sara Lafuerza, Joaquín García, Gloria Subías, Javier Blasco, and Vera Cuartero We present here an x-ray absorption study of the RFe2O4 series (LuFe2O4, YFe2O4, YbFe2O4, and LuCoFeO4) at the Fe K-edge. Extended x-ray absorption fine structure (EXAFS) and x-ray absorption near-edge structure (XANES) spectra were measured at temperatures ranging from 100 K to 390 K crossing the c... [Phys. Rev. B 89, 045129] Published Wed Jan 22, 2014

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Hybridized/coupled multiple resonances in nacre (2014)

Seung Ho Choi and Young L. Kim

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Seung Ho Choi and Young L. Kim We report that nacre (also known as mother-of-pearl), a wondrous nanocomposite found in nature, is a rich photonic nanomaterial allowing the experimental realization of collective excitation and light amplification via coupled states. Localized modes in three-dimensional complex media are typically ... [Phys. Rev. B 89, 035115] Published Fri Jan 10, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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NMR study of electronic correlations in Mn-doped Ba(Fe1−xCox)2As2 and BaFe2(As1−xPx)2 (2014)

D. Le; Boeuf, Y. Texier, M. Boselli, A. Forget, D. Colson, and J. Bobroff

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): D. LeBoeuf, Y. Texier, M. Boselli, A. Forget, D. Colson, and J. Bobroff We probe the real-space electronic response to a local magnetic impurity in isovalent and heterovalent doped BaFe2As2 (122) using nuclear magnetic resonance (NMR). The local moments carried by Mn impurities doped into Ba(Fe1−xCox)2As2 (Co-122) and BaFe2(As1−xPx)2 (P-122) at optimal doping induce a s... [Phys. Rev. B 89, 035114] Published Fri Jan 10, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Lattice effects in the quasi-two-dimensional valence-bond-solid Mott insulator EtMe3P[Pd(dmit)2]2 (2014)

Rudra Sekhar Manna, Mariano de Souza, Reizo Kato, and Michael Lang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): Rudra Sekhar Manna, Mariano de Souza, Reizo Kato, and Michael Lang The organic charge-transfer salt EtMe3P[Pd(dmit)2]2 is a quasi-two-dimensional Mott insulator with localized spins S=1/2 residing on a distorted triangular lattice. Here we report measurements of the uniaxial thermal expansion coefficients αi along the in-plane i=a and c axis as well as along the ou... [Phys. Rev. B 89, 045113] Published Fri Jan 10, 2014

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Quantum Hall phases of two-component bosons (2014)

T. Graß, D. Raventós, M. Lewenstein, and B. Juliá-Díaz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): T. Graß, D. Raventós, M. Lewenstein, and B. Juliá-Díaz The recent production of synthetic magnetic fields acting on electroneutral particles, such as atoms or photons, has boosted interest in the quantum Hall physics of bosons. Adding pseudospin 1/2 to the bosons greatly enriches the scenario, as it allows them to form an interacting integer quantum Hal... [Phys. Rev. B 89, 045114] Published Mon Jan 13, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Magnetic phase diagram of a five-orbital Hubbard model in the real-space Hartree-Fock approximation varying the electronic density (2014)

Qinlong Luo and Elbio Dagotto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Qinlong Luo and Elbio Dagotto Using the real-space Hartree-Fock approximation, the magnetic phase diagram of a five-orbital Hubbard model for the iron-based superconductors is studied varying the electronic density n in the range from five to seven electrons per transition metal atom. The Hubbard interaction U is also varied, at... [Phys. Rev. B 89, 045115] Published Mon Jan 13, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Consistent treatment of charged systems within periodic boundary conditions: The projector augmented-wave and pseudopotential methods revisited (2014)

Fabien Bruneval, Jean-Paul Crocombette, Xavier Gonze, Boris Dorado, Marc Torrent, and François Jollet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Fabien Bruneval, Jean-Paul Crocombette, Xavier Gonze, Boris Dorado, Marc Torrent, and François Jollet The ab initio calculation of charged defect properties in solids is not straightforward because of the delicate interplay between the long-range Coulomb interaction and the periodic boundary conditions. We derive the projector augmented-wave (PAW) energy and Hamiltonian with special care taken on th... [Phys. Rev. B 89, 045116] Published Mon Jan 13, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Diffractive stacks of metamaterial lattices with a complex unit cell: Self-consistent long-range bianisotropic interactions in experiment and theory (2014)

Andrej Kwadrin and A. Femius Koenderink

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Andrej Kwadrin and A. Femius Koenderink Metasurfaces and metamaterials promise arbitrary rerouting of light using two-dimensional (2D) planar arrangements of electric and magnetic scatterers, respectively, 3D stacks built out of such 2D planes. An important problem is how to self-consistently model the response of these systems in a manne... [Phys. Rev. B 89, 045120] Published Wed Jan 15, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Single-polaron properties for double-well electron-phonon coupling (2014)

Clemens P. J. Adolphs and Mona Berciu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Clemens P. J. Adolphs and Mona Berciu We show that in crystals where light ions are symmetrically intercalated between heavy ions, the electron-phonon coupling for carriers located at the light sites cannot be described by a Holstein model. We introduce the double-well electron-phonon coupling model to describe the most interesting para... [Phys. Rev. B 89, 035122] Published Thu Jan 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Effective model for the electronic properties of quasi-one-dimensional purple bronze Li0.9Mo6O17 based on ab initio calculations (2014)

Martin Nuss and Markus Aichhorn

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Martin Nuss and Markus Aichhorn We investigate the electronic structure of the strongly anisotropic, quasi-low-dimensional purple bronze Li0.9Mo6O17. Building on all-electron ab initio band-structure calculations, we obtain an effective model in terms of four maximally localized Wannier orbitals, which turn out to be far from atom... [Phys. Rev. B 89, 045125] Published Thu Jan 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Topological defects of Néel order and Kondo singlet formation for the Kondo-Heisenberg model on a honeycomb lattice (2014)

Pallab Goswami and Qimiao Si

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Pallab Goswami and Qimiao Si Heavy-fermion systems represent a prototypical setting to study magnetic quantum phase transitions. A particular focus has been on the physics of Kondo destruction, which captures quantum criticality beyond the Landau framework of order-parameter fluctuations. In this context, we study the spin one-... [Phys. Rev. B 89, 045124] Published Thu Jan 16, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Tunable all-angle negative refraction using antiferromagnets (2014)

R. Macêdo and T. Dumelow

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): R. Macêdo and T. Dumelow We show how all-angle negative refraction can occur in a uniaxial antiferromagnet close to the magnon resonance frequency. This behavior is based on the fact that, in such cases, the antiferromagnet acts as an indefinite permeability medium, i.e., not all its permeability tensor components are of th... [Phys. Rev. B 89, 035135] Published Wed Jan 22, 2014

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Wiedemann-Franz law and nonvanishing temperature scale across the field-tuned quantum critical point of YbRh2Si2 (2014)

J.-Ph. Reid, M. A. Tanatar, R. Daou, Rongwei Hu, C. Petrovic, and Louis Taillefer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): J.-Ph. Reid, M. A. Tanatar, R. Daou, Rongwei Hu, C. Petrovic, and Louis Taillefer The in-plane thermal conductivity κ and electrical resistivity ρ of the heavy-fermion metal YbRh2Si2 were measured down to 50 mK for magnetic fields H parallel and perpendicular to the tetragonal c axis, through the field-tuned quantum critical point Hc, at which antiferromagnetic order ends. The th... [Phys. Rev. B 89, 045130] Published Thu Jan 23, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Correlation matrix renormalization approximation for total-energy calculations of correlated electron systems (2014)

Y. X. Yao, J. Liu, C. Z. Wang, and K. M. Ho

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-24

Beschreibung: Author(s): Y. X. Yao, J. Liu, C. Z. Wang, and K. M. Ho We generalized the commonly used Gutzwiller approximation for calculating the electronic structure and total energy of strongly correlated electron systems. In our method, the evaluation of one-body and two-body density matrix elements of the Hamiltonian is simplified using a renormalization approxi... [Phys. Rev. B 89, 045131] Published Thu Jan 23, 2014

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Emergence of nonequilibrium charge dynamics in a charge-cluster glass (2014)

T. Sato, F. Kagawa, K. Kobayashi, K. Miyagawa, K. Kanoda, R. Kumai, Y. Murakami, and Y. Tokura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): T. Sato, F. Kagawa, K. Kobayashi, K. Miyagawa, K. Kanoda, R. Kumai, Y. Murakami, and Y. Tokura Nonequilibrium charge dynamics, such as cooling-rate-dependent charge vitrification and physical aging, have been demonstrated for a charge-cluster glass in θ-(BEDT-TTF)2CsZn(SCN)4 using electron transport measurements. The temperature evolution of the relaxation time obeys the Arrhenius law, indica... [Phys. Rev. B 89, 121102] Published Mon Mar 10, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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van der Waals density functional made accurate (2014)

Ikutaro Hamada

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Ikutaro Hamada I propose a van der Waals density functional (vdW-DF) that improves upon the description of energetics and geometries of molecules, solids, and adsorption systems over the original vdW-DF. The functional is based on the nonlocal correlation for the second version of the vdW-DF [Lee et al., Phys. Re... [Phys. Rev. B 89, 121103] Published Mon Mar 10, 2014

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Broadband chiral metamaterials with large optical activity (2014)

Kirsty Hannam, David A. Powell, Ilya V. Shadrivov, and Yuri S. Kivshar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Kirsty Hannam, David A. Powell, Ilya V. Shadrivov, and Yuri S. Kivshar We study theoretically and experimentally a type of metamaterial with hybrid elements composed of twisted pairs of cross-shaped meta-atoms and their complements. We reveal that such two-layer metasurfaces demonstrate large, dispersionless optical activity at the transmission resonance accompanied by... [Phys. Rev. B 89, 125105] Published Mon Mar 10, 2014

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Nonequilibrium noise in transport across a tunneling contact between ν=23 fractional quantum Hall edges (2014)

O. Shtanko, K. Snizhko, and V. Cheianov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): O. Shtanko, K. Snizhko, and V. Cheianov In a recent experimental paper [Bid et al., Nature 466, 585 (2010)] a qualitative confirmation of the existence of upstream neutral modes at the ν=23 quantum Hall edge was reported. Using the chiral Luttinger liquid theory of the quantum Hall edge we develop a quantitative model of the experiment o... [Phys. Rev. B 89, 125104] Published Mon Mar 10, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Evolution of the optical properties of chromium spinels CdCr2O4, HgCr2S4, and ZnCr2Se4 under high pressure (2014)

K. Rabia, L. Baldassarre, J. Deisenhofer, V. Tsurkan, and C. A. Kuntscher

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): K. Rabia, L. Baldassarre, J. Deisenhofer, V. Tsurkan, and C. A. Kuntscher We report pressure-dependent reflection and transmission measurements on ZnCr2Se4, HgCr2S4, and CdCr2O4 single crystals at room temperature over a broad spectral range 200–24 000 cm−1. The pressure dependence of the phonon modes and the high-frequency electronic excitations indicate that all three c... [Phys. Rev. B 89, 125107] Published Mon Mar 10, 2014

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Wigner localization in quantum dots from Kohn-Sham density functional theory without symmetry breaking (2014)

Christian B. Mendl, Francesc Malet, and Paola Gori-Giorgi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-11

Beschreibung: Author(s): Christian B. Mendl, Francesc Malet, and Paola Gori-Giorgi We address low-density two-dimensional circular quantum dots with spin-restricted Kohn-Sham density functional theory. By using an exchange-correlation functional that encodes the effects of the strongly correlated regime (and that becomes exact in the limit of infinite correlation), we are able to ... [Phys. Rev. B 89, 125106] Published Mon Mar 10, 2014

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Solution to sign problems in half-filled spin-polarized electronic systems (2014)

Emilie Fulton Huffman and Shailesh Chandrasekharan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Emilie Fulton Huffman and Shailesh Chandrasekharan We solve the sign problem in a particle-hole symmetric spin-polarized fermion model on bipartite lattices using the idea of fermion bags. The solution can be extended to a class of models at half filling but without particle-hole symmetry. Attractive Hubbard models with an odd number of fermion spec... [Phys. Rev. B 89, 111101] Published Wed Mar 12, 2014

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Generalized Wilson chain for solving multichannel quantum impurity problems (2014)

Andrew K. Mitchell, Martin R. Galpin, Samuel Wilson-Fletcher, David E. Logan, and Ralf Bulla

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Andrew K. Mitchell, Martin R. Galpin, Samuel Wilson-Fletcher, David E. Logan, and Ralf Bulla The numerical renormalization group is used to solve quantum impurity problems, which describe magnetic impurities in metals, nanodevices, and correlated materials within dynamical mean field theory. Here we present a simple generalization of the Wilson chain, which improves the scaling of computati... [Phys. Rev. B 89, 121105] Published Wed Mar 12, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Correlation between the valence state of cerium and the magnetic transition in Ce(Ru1−xFex)2Al10 studied by resonant x-ray emission spectroscopy (2014)

Yumiko Zekko, Yoshiya Yamamoto, Hitoshi Yamaoka, Fumisato Tajima, Takashi Nishioka, Fabio Strigari, Andrea Severing, Jun-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, and Jun'ichiro Mizuki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-13

Beschreibung: Author(s): Yumiko Zekko, Yoshiya Yamamoto, Hitoshi Yamaoka, Fumisato Tajima, Takashi Nishioka, Fabio Strigari, Andrea Severing, Jun-Fu Lin, Nozomu Hiraoka, Hirofumi Ishii, Ku-Ding Tsuei, and Jun'ichiro Mizuki The correlation between the 4f-conduction electron (c-f) hybridization and the transition temperature T0 into the unconventional antiferromagnetically (AFM) ordered state in Ce(Ru1−xFex)2Al10 has been investigated. The impact of pressure on the crystal structure and the electronic structure has been... [Phys. Rev. B 89, 125108] Published Wed Mar 12, 2014

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Temperature-dependent orbital physics in a spin-orbital-lattice-coupled 2p electron Mott system: The case of KO2 (2014)

Minjae Kim and B. I. Min

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): Minjae Kim and B. I. Min We have investigated the temperature (T)-dependent evolution of orbital states in a typical spin-orbital-lattice-coupled 2p electron Mott system KO2, based on the electronic structures obtained by the dynamical mean-field theory as well as the density functional theory. We have shown that KO2 exhibi... [Phys. Rev. B 89, 121106] Published Thu Mar 13, 2014

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Photoinduced changes in the cuprate electronic structure revealed by femtosecond time- and angle-resolved photoemission (2014)

J. D. Rameau, S. Freutel, L. Rettig, I. Avigo, M. Ligges, Y. Yoshida, H. Eisaki, J. Schneeloch, R. D. Zhong, Z. J. Xu, G. D. Gu, P. D. Johnson, and U. Bovensiepen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): J. D. Rameau, S. Freutel, L. Rettig, I. Avigo, M. Ligges, Y. Yoshida, H. Eisaki, J. Schneeloch, R. D. Zhong, Z. J. Xu, G. D. Gu, P. D. Johnson, and U. Bovensiepen The dressing of quasiparticles in solids is investigated by changes in the electronic structure E(k) driven by femtosecond laser pulses. Employing time- and angle-resolved photoemission on an optimally doped cuprate above Tc, we observe two effects with different characteristic temporal evolutions a... [Phys. Rev. B 89, 115115] Published Thu Mar 13, 2014

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Effects of d-band shape on the surface reactivity of transition-metal alloys (2014)

Hongliang Xin, Aleksandra Vojvodic, Johannes Voss, Jens K. Nørskov, and Frank Abild-Pedersen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-14

Beschreibung: Author(s): Hongliang Xin, Aleksandra Vojvodic, Johannes Voss, Jens K. Nørskov, and Frank Abild-Pedersen The d-band shape of a metal site, governed by the local geometry and composition of materials, plays an important role in determining trends of the surface reactivity of transition-metal alloys. We discuss this phenomenon using the chemisorption of various adsorbates such as C, N, O, and their hydro... [Phys. Rev. B 89, 115114] Published Thu Mar 13, 2014

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Blind deconvolution of density-matrix renormalization-group spectra (2014)

M. Paech and E. Jeckelmann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-02

Beschreibung: Author(s): M. Paech and E. Jeckelmann We present a numerical method for calculating piecewise smooth spectral functions of correlated quantum systems in the thermodynamic limit from the spectra of finite systems computed using the dynamical or correction-vector density-matrix renormalization group method. The key idea is to consider thi... [Phys. Rev. B 89, 195101] Published Thu May 01, 2014

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Effects of Cu2+ doping and pressure on the exchange-mediated exciton dynamics in one-dimensional N(CH3)4MnCl3 (2014)

Lucie Nataf, José Antonio Barreda-Argüeso, Rafael Valiente, Jesús González, and Fernando Rodríguez

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): Lucie Nataf, José Antonio Barreda-Argüeso, Rafael Valiente, Jesús González, and Fernando Rodríguez This work investigates the Mn2+ electronic structure and exciton dynamics in one-dimensional (1D) N(CH3)4MnCl3 (TMMC) through time-resolved excitation/emission spectroscopy and absorption measurements in the 0–10 GPa pressure range for different Cu2+ doping concentrations. The local and crystal stru... [Phys. Rev. B 89, 115120] Published Thu Mar 20, 2014

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Confinement-driven transitions between topological and Mott phases in (LaNiO3)N/(LaAlO3)M(111) superlattices (2014)

David Doennig, Warren E. Pickett, and Rossitza Pentcheva

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): David Doennig, Warren E. Pickett, and Rossitza Pentcheva A set of broken-symmetry two-dimensional ground states is predicted in (111)-oriented (LaNiO3)N/(LaAlO3)M (N/M) superlattices, based on density functional theory calculations including a Hubbard U term. An unanticipated Jahn-Teller distortion with dz2 orbital polarization and a ferromagnetic Mott-in... [Phys. Rev. B 89, 121110] Published Thu Mar 20, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Possible undercompensation effect in the Kondo insulator (Yb,Tm)B12 (2014)

P. A. Alekseev, K. S. Nemkovski, J.-M. Mignot, E. S. Clementyev, A. S. Ivanov, S. Rols, R. I. Bewley, V. B. Filipov, and N. Yu. Shitsevalova

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-21

Beschreibung: Author(s): P. A. Alekseev, K. S. Nemkovski, J.-M. Mignot, E. S. Clementyev, A. S. Ivanov, S. Rols, R. I. Bewley, V. B. Filipov, and N. Yu. Shitsevalova The effects of Tm substitution on the dynamical magnetic response of Yb1−xTmxB12 (x=0, 0.08, 0.15, and 0.75) and Lu0.92Tm0.08B12 compounds have been studied using time-of-flight inelastic neutron scattering. Major changes were observed in the spectral structure and temperature evolution of the Yb co... [Phys. Rev. B 89, 115121] Published Thu Mar 20, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Microscopic evidence for strong periodic lattice distortion in two-dimensional charge-density wave systems (2014)

Jixia Dai, Eduardo Calleja, Jacob Alldredge, Xiangde Zhu, Lijun Li, Wenjian Lu, Yuping Sun, Thomas Wolf, Helmuth Berger, and Kyle McElroy

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): Jixia Dai, Eduardo Calleja, Jacob Alldredge, Xiangde Zhu, Lijun Li, Wenjian Lu, Yuping Sun, Thomas Wolf, Helmuth Berger, and Kyle McElroy In quasi-two-dimensional electron systems of layered transition metal dichalcogenides (TMDs) there is still controversy about the nature of the transitions to charge-density wave (CDW) phases, i.e., whether they are described by a Peierls-type mechanism or by a lattice-driven model. By performing sc... [Phys. Rev. B 89, 165140] Published Wed Apr 30, 2014

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Effect of As-chain layers in CaFeAs2 (2014)

Xianxin Wu, Congcong Le, Yi Liang, Shengshan Qin, Heng Fan, and Jiangping Hu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-06

Beschreibung: Author(s): Xianxin Wu, Congcong Le, Yi Liang, Shengshan Qin, Heng Fan, and Jiangping Hu The recently discovered iron-based superconductors have chainlike As layers. These layers generate an additional three-dimensional hole pocket and conelike electron pockets. The former is attributed to the Ca d and As1 pz orbitals and the latter are attributed to the anisotropic Dirac cone, contribu... [Phys. Rev. B 89, 205102] Published Mon May 05, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Floquet-Hubbard bound states in the continuum (2014)

Giuseppe Della Valle and Stefano Longhi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Giuseppe Della Valle and Stefano Longhi We theoretically demonstrate that a type of robust two-particle bound state embedded in the continuum (BIC), which we call Floquet-Hubbard (FH) BIC, can be induced in a homogeneous (i.e., defect-free) Hubbard semilattice by an intense oscillating electric field. While single-particle BIC states are ... [Phys. Rev. B 89, 115118] Published Wed Mar 19, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Influence of interactions with noncondensed particles on the coherence of a one-dimensional polariton condensate (2014)

Johannes Schmutzler, Tomasz Kazimierczuk, Ömer Bayraktar, Marc Aßmann, Manfred Bayer, Sebastian Brodbeck, Martin Kamp, Christian Schneider, and Sven Höfling

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): Johannes Schmutzler, Tomasz Kazimierczuk, Ömer Bayraktar, Marc Aßmann, Manfred Bayer, Sebastian Brodbeck, Martin Kamp, Christian Schneider, and Sven Höfling One-dimensional polariton condensates (PoCos) in a photonic wire are generated through nonresonant laser excitation, by which also a reservoir of background carriers is created. Interaction with this reservoir may affect the coherence of the PoCo, which is studied here by injecting a condensate loca... [Phys. Rev. B 89, 115119] Published Wed Mar 19, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Quantifying entanglement with scattering experiments (2014)

O. Marty, M. Epping, H. Kampermann, D. Bruß, M. B. Plenio, and M. Cramer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): O. Marty, M. Epping, H. Kampermann, D. Bruß, M. B. Plenio, and M. Cramer We show how the entanglement contained in states of spins arranged on a lattice may be lower bounded with observables arising in scattering experiments. We focus on the partial differential cross section obtained in neutron scattering from magnetic materials but our results are sufficiently general ... [Phys. Rev. B 89, 125117] Published Wed Mar 19, 2014

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Hole bipolaron formation at (100) MgO/CaO epitaxial interface (2014)

N. Bondarenko, O. Eriksson, and N. V. Skorodumova

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-03-20

Beschreibung: Author(s): N. Bondarenko, O. Eriksson, and N. V. Skorodumova Hole localization accompanying the formation of a cation vacancy in bulk MgO and CaO and at the (100) MgO/CaO interface is described using the Heyd-Scuseria-Ernzerhof hybrid functionals and DFT + U method. The ground state is found to be the O1−O1 bipolaronic configuration both in bulk oxides and at... [Phys. Rev. B 89, 125118] Published Wed Mar 19, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Finite-frequency-dependent noise of a quantum dot in a magnetic field (2014)

C. P. Moca, P. Simon, Chung-Hou Chung, and G. Zaránd

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-30

Beschreibung: Author(s): C. P. Moca, P. Simon, Chung-Hou Chung, and G. Zaránd We present a detailed study for the finite-frequency current noise of a Kondo quantum dot in the presence of a magnetic field by using a recently developed real-time functional renormalization group approach [C. P. Moca, P. Simon, C. H. Chung, and G. Zaránd, Phys. Rev. B 83, 201303(R) (2011)]. The s... [Phys. Rev. B 89, 155138] Published Tue Apr 29, 2014

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Mott-Anderson transition in disordered charge-transfer model: Insights from typical medium theory (2014)

W. S. Oliveira, M. C. O. Aguiar, and V. Dobrosavljević

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): W. S. Oliveira, M. C. O. Aguiar, and V. Dobrosavljević The Mott-Anderson transition in the disordered charge-transfer model displays several new features in comparison to what is found in the disordered single-band Hubbard model, as recently demonstrated by large-scale computational (statistical dynamical mean-field theory) studies. Here we show that a ... [Phys. Rev. B 89, 165138] Published Wed Apr 30, 2014

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Third-harmonic generation in one-dimensional photonic crystal with graphene-based defect (2014)

M. A. Vincenti, D. de Ceglia, M. Grande, A. D’Orazio, and M. Scalora

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): M. A. Vincenti, D. de Ceglia, M. Grande, A. D’Orazio, and M. Scalora Third-harmonic generation may be dramatically enhanced in monolayer graphene by inserting it in a properly designed structure. In addition, placing graphene within the defect layer of an asymmetric, one-dimensional photonic crystal triggers nearly 100% narrowband absorption. We demonstrate that the ... [Phys. Rev. B 89, 165139] Published Wed Apr 30, 2014

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Effects of short-ranged interactions on the Kane-Mele model without discrete particle-hole symmetry (2014)

Hsin-Hua Lai and Hsiang-Hsuan Hung

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Hsin-Hua Lai and Hsiang-Hsuan Hung We study the effects of short-ranged interactions on the Z2 topological insulator phase, also known as the quantum spin Hall phase, in the Kane-Mele model at half-filling with staggered potentials, which explicitly breaks the discrete particle-hole symmetry. Within Hartree-Fock mean-field analysis, ... [Phys. Rev. B 89, 165135] Published Mon Apr 28, 2014

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Intermediate and spin-liquid phase of the half-filled honeycomb Hubbard model (2014)

Qiaoni Chen, George H. Booth, Sandeep Sharma, Gerald Knizia, and Garnet Kin-Lic Chan

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Qiaoni Chen, George H. Booth, Sandeep Sharma, Gerald Knizia, and Garnet Kin-Lic Chan We obtain the phase diagram of the half-filled honeycomb Hubbard model with density matrix embedding theory, to address recent controversy at intermediate couplings. We use clusters from 2–12 sites and lattices at the thermodynamic limit. We identify a paramagnetic insulating state, with possible he... [Phys. Rev. B 89, 165134] Published Mon Apr 28, 2014

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Electrodynamic modeling of strong coupling between a metasurface and intersubband transitions in quantum wells (2014)

Salvatore Campione, Alexander Benz, John F. Klem, Michael B. Sinclair, Igal Brener, and Filippo Capolino

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-29

Beschreibung: Author(s): Salvatore Campione, Alexander Benz, John F. Klem, Michael B. Sinclair, Igal Brener, and Filippo Capolino Strong light-matter coupling has recently been demonstrated in subwavelength volumes by coupling engineered optical transitions in semiconductor heterostructures (e.g., quantum wells) to metasurface resonances via near fields. It has also been shown that different resonator shapes may lead to differ... [Phys. Rev. B 89, 165133] Published Mon Apr 28, 2014

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Chalker scaling, level repulsion, and conformal invariance in critically delocalized quantum matter: Disordered topological superconductors and artificial graphene (2014)

Yang-Zhi Chou and Matthew S. Foster

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): Yang-Zhi Chou and Matthew S. Foster We numerically investigate critically delocalized wave functions in models of two-dimensional Dirac fermions, subject to vector potential disorder. These describe the surface states of three-dimensional topological superconductors, and can also be realized through long-range correlated bond randomne... [Phys. Rev. B 89, 165136] Published Wed Apr 30, 2014

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Ultrafast terahertz dynamics of hot Dirac-electron surface scattering in the topological insulator Bi2Se3 (2014)

Sangwan Sim, Matthew Brahlek, Nikesh Koirala, Soonyoung Cha, Seongshik Oh, and Hyunyong Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): Sangwan Sim, Matthew Brahlek, Nikesh Koirala, Soonyoung Cha, Seongshik Oh, and Hyunyong Choi Two-dimensional surface-scattering dynamics are central in the physics of topological insulators. Numerous electrical and optical measurements have evidenced that the origins of novel optoelectronic response can be traced back to Dirac surface-electron dynamics. Intrinsic surface dynamics, however, ... [Phys. Rev. B 89, 165137] Published Wed Apr 30, 2014

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Topological protection, disorder, and interactions: Survival at the surface of three-dimensional topological superconductors (2014)

Matthew S. Foster, Hong-Yi Xie, and Yang-Zhi Chou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): Matthew S. Foster, Hong-Yi Xie, and Yang-Zhi Chou We consider the interplay of disorder and interactions upon the gapless surface states of 3D topological superconductors. The combination of topology and superconducting order inverts the action of time-reversal symmetry, so that extrinsic time-reversal invariant surface perturbations appear only as... [Phys. Rev. B 89, 155140] Published Wed Apr 30, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Thema: Physik

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Microscopic observation of superconducting fluctuations in κ-(BEDT-TTF)2Cu[N(CN)2]Br by C13 NMR spectroscopy (2014)

T. Kobayashi, Y. Ihara, Y. Saito, and A. Kawamoto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-05-01

Beschreibung: Author(s): T. Kobayashi, Y. Ihara, Y. Saito, and A. Kawamoto We performed C13-NMR experiment and measured spin-lattice relaxation rate divided by temperature 1/T1T near the superconducting (SC) transition temperature Tc in κ-(BEDT-TTF)2Cu[N(CN)2]Br (κ-Br salt), and κ-(BEDT-TTF)2Cu(NCS)2 (κ-NCS salt). We observed the reduction of 1/T1T starting at the temperat... [Phys. Rev. B 89, 165141] Published Wed Apr 30, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Theory of band warping and its effects on thermoelectronic transport properties (2014)

Nicholas A. Mecholsky, Lorenzo Resca, Ian L. Pegg, and Marco Fornari

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): Nicholas A. Mecholsky, Lorenzo Resca, Ian L. Pegg, and Marco Fornari Optical and transport properties of materials depend heavily upon features of electronic band structures in proximity of energy extrema in the Brillouin zone (BZ). Such features are generally described in terms of multidimensional quadratic expansions and corresponding definitions of effective masse... [Phys. Rev. B 89, 155131] Published Thu Apr 24, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Dirac fermion time-Floquet crystal: Manipulating Dirac points (2014)

Pablo Rodriguez-Lopez, Joseph J. Betouras, and Sergey E. Savel'ev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): Pablo Rodriguez-Lopez, Joseph J. Betouras, and Sergey E. Savel'ev We demonstrate how to control the spectra and current flow of Dirac electrons in both a graphene sheet and a topological insulator (TI) by applying either two linearly polarized laser fields with frequencies ω and 2ω or a monochromatic (one-frequency) laser field together with a spatially periodic s... [Phys. Rev. B 89, 155132] Published Thu Apr 24, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Thermoelectric effects in molecular quantum dots with contacts (2014)

T. Koch, J. Loos, and H. Fehske

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): T. Koch, J. Loos, and H. Fehske We consider the steady-state thermoelectric transport through a vibrating molecular quantum dot that is contacted to macroscopic leads. For moderate electron-phonon interaction strength and comparable electronic and phononic timescales, we investigate the impact of the formation of a local polaron o... [Phys. Rev. B 89, 155133] Published Thu Apr 24, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Spin density waves in the Hubbard model: A DMFT approach (2014)

Robert Peters and Norio Kawakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): Robert Peters and Norio Kawakami We analyze spin density waves (SDWs) in the Hubbard model on a square lattice within the framework of inhomogeneous dynamical mean field theory (IDMFT). Doping the half-filled Hubbard model results in a change of the antiferromagnetic Néel state, which exists exactly at half filling, to a phase of i... [Phys. Rev. B 89, 155134] Published Thu Apr 24, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Spectrally resolved femtosecond reflectivity relaxation dynamics in undoped spin-density wave 122-structure iron-based pnictides (2014)

A. Pogrebna, N. Vujičić, T. Mertelj, T. Borzda, G. Cao, Z. A. Xu, J.-H. Chu, I. R. Fisher, and D. Mihailovic

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-25

Beschreibung: Author(s): A. Pogrebna, N. Vujičić, T. Mertelj, T. Borzda, G. Cao, Z. A. Xu, J.-H. Chu, I. R. Fisher, and D. Mihailovic We systematically investigate temperature- and spectrally dependent optical reflectivity dynamics in AAs2Fe2, (A=Ba, Sr, and Eu), iron-based superconductors parent spin-density wave (SDW) compounds. Two different relaxation processes are identified. The behavior of the slower process, which is stron... [Phys. Rev. B 89, 165131] Published Thu Apr 24, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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Detecting Majorana fermions in quasi-one-dimensional topological phases using nonlocal order parameters (2014)

Yasaman Bahri and Ashvin Vishwanath

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-04-26

Beschreibung: Author(s): Yasaman Bahri and Ashvin Vishwanath Topological phases which host Majorana fermions can not be identified via local order parameters. We give simple nonlocal order parameters to distinguish quasi-one-dimensional (1D) topological superconductors of spinless fermions, for any interacting model in the absence of time reversal symmetry. T... [Phys. Rev. B 89, 155135] Published Fri Apr 25, 2014

Schlagwort(e): Electronic structure and strongly correlated systems

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