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Damping in Yttrium Iron Garnet Nanoscale Films Capped by Platinum (2013)

Yiyan Sun, Houchen Chang, Michael Kabatek, Young-Yeal Song, Zihui Wang, Michael Jantz, William Schneider, Mingzhong Wu, E. Montoya, B. Kardasz, B. Heinrich, Suzanne G. E. te Velthuis, Helmut Schultheiss, and Axel Hoffmann

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): Yiyan Sun, Houchen Chang, Michael Kabatek, Young-Yeal Song, Zihui Wang, Michael Jantz, William Schneider, Mingzhong Wu, E. Montoya, B. Kardasz, B. Heinrich, Suzanne G. E. te Velthuis, Helmut Schultheiss, and Axel Hoffmann Strong damping enhancement in nm-thick yttrium iron garnet (YIG) films due to Pt capping layers was observed. This damping is substantially larger than the expected damping due to conventional spin pumping, is accompanied by a shift in the ferromagnetic resonance field, and can be suppressed by the ... [Phys. Rev. Lett. 111, 106601] Published Fri Sep 06, 2013

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

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Imprint of primordial non-Gaussianity on dark matter halo profiles (2013)

Azadeh Moradinezhad Dizgah, Scott Dodelson, and Antonio Riotto

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Azadeh Moradinezhad Dizgah, Scott Dodelson, and Antonio Riotto We study the impact of primordial non-Gaussianity on the density profile of dark matter halos by using the semianalytical model introduced recently by Dalal et al. which relates the peaks of the initial linear density field to the final density profile of dark matter halos. Models with primordial no... [Phys. Rev. D 88, 063513] Published Mon Sep 09, 2013

Schlagwort(e): Astrophysics & Cosmology

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Experimental Demonstration of Scanned Spin-Precession Microscopy (2013)

V. P. Bhallamudi, C. S. Wolfe, V. P. Amin, D. E. Labanowski, A. J. Berger, D. Stroud, J. Sinova, and P. C. Hammel

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): V. P. Bhallamudi, C. S. Wolfe, V. P. Amin, D. E. Labanowski, A. J. Berger, D. Stroud, J. Sinova, and P. C. Hammel We present a new tool for imaging spin properties. We show that a spatially averaged spin signal, measured as a function of a scanned magnetic probe’s position, contains information about the local spin properties. In this first demonstration we map the injected spin density in GaAs by measuring spi... [Phys. Rev. Lett. 111, 117201] Published Tue Sep 10, 2013

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Nematicity as a Probe of Superconducting Pairing in Iron-Based Superconductors (2013)

Rafael M. Fernandes and Andrew J. Millis

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Rafael M. Fernandes and Andrew J. Millis In several families of iron-based superconducting materials, a d -wave pairing instability may compete with the leading s -wave instability. Here, we show that when both states have comparable free energies, superconducting and nematic degrees of freedom are strongly coupled. Whereas nematic order cau... [Phys. Rev. Lett. 111, 127001] Published Mon Sep 16, 2013

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Comparative analysis of model-independent methods for exploring the nature of dark energy (2013)

Savvas Nesseris and Juan García-Bellido

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Savvas Nesseris and Juan García-Bellido We make a comparative analysis of the various independent methods proposed in the literature for studying the nature of dark energy, using four different mocks of SnIa data. In particular, we explore a generic principal components analysis approach, the genetic algorithms, a series of approximations... [Phys. Rev. D 88, 063521] Published Tue Sep 17, 2013

Schlagwort(e): Astrophysics & Cosmology

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Testing modified gravity with Planck: The case of coupled dark energy (2013)

Valeria Pettorino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Valeria Pettorino The Planck collaboration has recently published maps of the cosmic microwave background (CMB) radiation, in good agreement with a Λ CDM model, a fit especially valid for multipoles ℓ 〉40. We explore here the possibility that dark energy is dynamical and gravitational attraction between dark matter ... [Phys. Rev. D 88, 063519] Published Tue Sep 17, 2013

Schlagwort(e): Astrophysics & Cosmology

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Peltier Cooling and Onsager Reciprocity in Ferromagnetic Thin Films (2013)

A. D. Avery and B. L. Zink

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): A. D. Avery and B. L. Zink We present direct measurements of the Peltier effect as a function of temperature from 77 to 325 K in Ni, Ni 80 Fe 20 , and Fe thin films made using a suspended Si-N membrane structure. Measurement of the Seebeck effect in the same films allows us to directly test predictions of Onsager reciprocity betw... [Phys. Rev. Lett. 111, 126602] Published Tue Sep 17, 2013

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Giant Magnetic Susceptibility of Gold Nanorods Detected by Magnetic Alignment (2013)

P. G. van Rhee, P. Zijlstra, T. G. A. Verhagen, J. Aarts, M. I. Katsnelson, J. C. Maan, M. Orrit, and P. C. M. Christianen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): P. G. van Rhee, P. Zijlstra, T. G. A. Verhagen, J. Aarts, M. I. Katsnelson, J. C. Maan, M. Orrit, and P. C. M. Christianen We have determined the magnetic properties of single-crystalline Au nanorods in solution using an optically detected magnetic alignment technique. The rods exhibit a large anisotropy in the magnetic volume susceptibility ( Δ χ V ). Δ χ V increases with decreasing rod size and increasing aspect ratio and c... [Phys. Rev. Lett. 111, 127202] Published Tue Sep 17, 2013

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Local Conservation Laws and the Structure of the Many-Body Localized States (2013)

Maksym Serbyn, Z. Papić, and Dmitry A. Abanin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Maksym Serbyn, Z. Papić, and Dmitry A. Abanin We construct a complete set of local integrals of motion that characterize the many-body localized (MBL) phase. Our approach relies on the assumption that local perturbations act locally on the eigenstates in the MBL phase, which is supported by numerical simulations of the random-field X X Z spin cha... [Phys. Rev. Lett. 111, 127201] Published Tue Sep 17, 2013

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Spin-Induced Optical Conductivity in the Spin-Liquid Candidate Herbertsmithite (2013)

D. V. Pilon, C. H. Lui, T. -H. Han, D. Shrekenhamer, A. J. Frenzel, W. J. Padilla, Y. S. Lee, and N. Gedik

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): D. V. Pilon, C. H. Lui, T. -H. Han, D. Shrekenhamer, A. J. Frenzel, W. J. Padilla, Y. S. Lee, and N. Gedik We report a direct measurement of the low-frequency optical conductivity of large-area single-crystal herbertsmithite, a promising spin-liquid candidate material, by means of terahertz time-domain spectroscopy. In the spectral range below 1.4 THz, we observe a contribution to the real part of the in... [Phys. Rev. Lett. 111, 127401] Published Wed Sep 18, 2013

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Derivative Discontinuity in the Strong-Interaction Limit of Density-Functional Theory (2013)

André Mirtschink, Michael Seidl, and Paola Gori-Giorgi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): André Mirtschink, Michael Seidl, and Paola Gori-Giorgi We generalize the exact strong-interaction limit of the exchange-correlation energy of Kohn-Sham density functional theory to open systems with fluctuating particle numbers. When used in the self-consistent Kohn-Sham procedure on strongly interacting systems, this functional yields exact features cr... [Phys. Rev. Lett. 111, 126402] Published Wed Sep 18, 2013

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Detection and Measurement of Spin-Dependent Dynamics in Random Telegraph Signals (2013)

M. G. House, Ming Xiao, Guo; Ping Guo, Hai; Ou Li, Gang Cao, M. M. Rosenthal, and Hong; Wen Jiang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): M. G. House, Ming Xiao, GuoPing Guo, HaiOu Li, Gang Cao, M. M. Rosenthal, and HongWen Jiang A quantum point contact was used to observe single-electron fluctuations of a quantum dot in a GaAs heterostructure. The resulting random telegraph signals (RTS) contain statistical information about the electron spin state if the tunneling dynamics are spin dependent. We develop a statistical metho... [Phys. Rev. Lett. 111, 126803] Published Wed Sep 18, 2013

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Dark-matter distributions around massive black holes: A general relativistic analysis (2013)

Laleh Sadeghian, Francesc Ferrer, and Clifford M. Will

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Laleh Sadeghian, Francesc Ferrer, and Clifford M. Will The cold dark matter at the center of a galaxy will be redistributed by the presence of a massive black hole. The redistribution may be determined using an approach pioneered by Gondolo and Silk: begin with a model distribution function for the dark matter, and “grow” the black hole adiabatically, h... [Phys. Rev. D 88, 063522] Published Thu Sep 19, 2013

Schlagwort(e): Astrophysics & Cosmology

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Imaging the Three-Dimensional Fermi-Surface Pairing near the Hidden-Order Transition in URu_{2}Si_{2} Using Angle-Resolved Photoemission Spectroscopy (2013)

Jian-Qiao Meng, Peter M. Oppeneer, John A. Mydosh, Peter S. Riseborough, Krzysztof Gofryk, John J. Joyce, Eric D. Bauer, Yinwan Li, and Tomasz Durakiewicz

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Jian-Qiao Meng, Peter M. Oppeneer, John A. Mydosh, Peter S. Riseborough, Krzysztof Gofryk, John J. Joyce, Eric D. Bauer, Yinwan Li, and Tomasz Durakiewicz We report angle-resolved photoemission spectroscopy experiments probing deep into the hidden-order state of URu 2 Si 2 , utilizing tunable photon energies with sufficient energy and momentum resolution to detect the near Fermi-surface (FS) behavior. Our results reveal (i) the full itinerancy of the 5 f e... [Phys. Rev. Lett. 111, 127002] Published Thu Sep 19, 2013

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Massive Symmetry Breaking in LaAlO_{3}/SrTiO_{3}(111) Quantum Wells: A Three-Orbital Strongly Correlated Generalization of Graphene (2013)

David Doennig, Warren E. Pickett, and Rossitza Pentcheva

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): David Doennig, Warren E. Pickett, and Rossitza Pentcheva Density functional theory calculations with an on-site Coulomb repulsion term reveal competing ground states in (111)-oriented (LaAlO 3 ) M /(SrTiO 3 ) N superlattices with n -type interfaces, ranging from spin, orbitally polarized (with selective e g ′ , a 1 g , or d x y occupation), Dirac point Fermi surface, to ... [Phys. Rev. Lett. 111, 126804] Published Thu Sep 19, 2013

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Circular Dichroism and Superdiffusive Transport at the Surface of BiTeI (2013)

J. Mauchain, Y. Ohtsubo, M. Hajlaoui, E. Papalazarou, M. Marsi, A. Taleb-Ibrahimi, J. Faure, K. A. Kokh, O. E. Tereshchenko, S. V. Eremeev, E. V. Chulkov, and L. Perfetti

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): J. Mauchain, Y. Ohtsubo, M. Hajlaoui, E. Papalazarou, M. Marsi, A. Taleb-Ibrahimi, J. Faure, K. A. Kokh, O. E. Tereshchenko, S. V. Eremeev, E. V. Chulkov, and L. Perfetti We investigate the electronic states of BiTeI after the optical pumping with circularly polarized photons. Our data show that photoexcited electrons reach an internal thermalization within 300 fs of the arrival of the pump pulse. Instead, the dichroic contrast generated by the circularly polarized l... [Phys. Rev. Lett. 111, 126603] Published Thu Sep 19, 2013

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Cosmology from the thermal Sunyaev-Zel’dovich power spectrum: Primordial non-Gaussianity and massive neutrinos (2013)

J. Colin Hill and Enrico Pajer

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): J. Colin Hill and Enrico Pajer We carry out a comprehensive analysis of the possible constraints on cosmological and astrophysical parameters achievable with measurements of the thermal Sunyaev-Zel’dovich (tSZ) power spectrum from upcoming full-sky cosmic microwave background observations, with a particular focus on one-parameter... [Phys. Rev. D 88, 063526] Published Mon Sep 23, 2013

Schlagwort(e): Astrophysics & Cosmology

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Scaling between Magnetic and Lattice Fluctuations in Iron Pnictide Superconductors (2013)

Rafael M. Fernandes, Anna E. Böhmer, Christoph Meingast, and Jörg Schmalian

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-25

Beschreibung: Author(s): Rafael M. Fernandes, Anna E. Böhmer, Christoph Meingast, and Jörg Schmalian The phase diagram of the iron arsenides is dominated by a magnetic and a structural phase transition, which need to be suppressed in order for superconductivity to appear. The proximity between the two transition temperature lines indicates correlation between these two phases, whose nature remains ... [Phys. Rev. Lett. 111, 137001] Published Tue Sep 24, 2013

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Large-Gap Quantum Spin Hall Insulators in Tin Films (2013)

Yong Xu, Binghai Yan, Hai-Jun Zhang, Jing Wang, Gang Xu, Peizhe Tang, Wenhui Duan, and Shou-Cheng Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-25

Beschreibung: Author(s): Yong Xu, Binghai Yan, Hai-Jun Zhang, Jing Wang, Gang Xu, Peizhe Tang, Wenhui Duan, and Shou-Cheng Zhang The search for large-gap quantum spin Hall (QSH) insulators and effective approaches to tune QSH states is important for both fundamental and practical interests. Based on first-principles calculations we find two-dimensional tin films are QSH insulators with sizable bulk gaps of 0.3 eV, sufficientl... [Phys. Rev. Lett. 111, 136804] Published Tue Sep 24, 2013

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Interplay of the Kondo Effect and Strong Spin-Orbit Coupling in Multihole Ultraclean Carbon Nanotubes (2013)

J. P. Cleuziou, N. G. N’Guyen, S. Florens, and W. Wernsdorfer

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-25

Beschreibung: Author(s): J. P. Cleuziou, N. G. N’Guyen, S. Florens, and W. Wernsdorfer We report on cotunneling spectroscopy magnetoconductance measurements of multihole ultraclean carbon nanotube quantum dots in the SU(4) Kondo regime with strong spin-orbit coupling. Successive shells show a gradual weakening of the Kondo effect with respect to the spin-orbital splittings, leading to... [Phys. Rev. Lett. 111, 136803] Published Tue Sep 24, 2013

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Majorana Fermions in Vortex Lattices (2013)

Rudro R. Biswas

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Rudro R. Biswas We consider Majorana fermions tunneling among an array of vortices in a 2D chiral p -wave superconductor or equivalent material. The amplitude for Majorana fermions to tunnel between a pair of vortices is found to necessarily depend on the background superconducting phase profile; it is found to be p... [Phys. Rev. Lett. 111, 136401] Published Wed Sep 25, 2013

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Photoluminescence of Single-Walled Carbon Nanotubes: The Role of Stokes Shift and Impurity Levels (2013)

Jinglin Mu, Yuchen Ma, Huabing Yin, Chengbu Liu, and Michael Rohlfing

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Jinglin Mu, Yuchen Ma, Huabing Yin, Chengbu Liu, and Michael Rohlfing Recent experiments have indicated that dopants and defects can trigger new redshifted photoluminescence (PL) peaks below the E 11 peak in single-walled carbon nanotubes (SWCNTs). To understand the origin of the new PL peaks, we study theoretically the excited-state properties of SWCNTs with some typi... [Phys. Rev. Lett. 111, 137401] Published Wed Sep 25, 2013

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Entanglement Detection from Conductance Measurements in Carbon Nanotube Cooper Pair Splitters (2013)

Bernd Braunecker, Pablo Burset, and Alfredo Levy Yeyati

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Bernd Braunecker, Pablo Burset, and Alfredo Levy Yeyati Spin-orbit interaction provides a spin filtering effect in carbon nanotube based Cooper pair splitters that allows us to determine spin correlators directly from current measurements. The spin filtering axes are tunable by a global external magnetic field. By a bending of the nanotube, the filtering... [Phys. Rev. Lett. 111, 136806] Published Wed Sep 25, 2013

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Observation of Squeezing in the Electron Quantum Shot Noise of a Tunnel Junction (2013)

Gabriel Gasse, Christian Lupien, and Bertrand Reulet

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Gabriel Gasse, Christian Lupien, and Bertrand Reulet We report the measurement of the fluctuations of the two quadratures of the electromagnetic field generated by a quantum conductor, a dc- and ac-biased tunnel junction placed at very low temperature. We observe that the variance of the fluctuations on one quadrature can go below that of vacuum, i.e.... [Phys. Rev. Lett. 111, 136601] Published Wed Sep 25, 2013

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Phenomenology of Dirac neutralino dark matter (2013)

Matthew R. Buckley, Dan Hooper, and Jason Kumar

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Matthew R. Buckley, Dan Hooper, and Jason Kumar In supersymmetric models with an unbroken R symmetry (rather than only R parity), the neutralinos are Dirac fermions rather than Majorana. In this article, we discuss the phenomenology of neutralino dark matter in such models, including the calculation of the thermal relic abundance, and constraints... [Phys. Rev. D 88, 063532] Published Thu Sep 26, 2013

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What Planck does not tell us about inflation (2013)

Joseph Elliston, David Mulryne, and Reza Tavakol

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Joseph Elliston, David Mulryne, and Reza Tavakol Planck data has not found the “smoking gun” of non-Gaussianity that would have necessitated consideration of inflationary models beyond the simplest canonical single-field scenarios. This raises the important question of what these results do imply for more general models, and in particular, multifi... [Phys. Rev. D 88, 063533] Published Thu Sep 26, 2013

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Complete cosmic history with a dynamical Λ=Λ(H) term (2013)

E. L. D. Perico, J. A. S. Lima, Spyros Basilakos, and Joan Solà

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): E. L. D. Perico, J. A. S. Lima, Spyros Basilakos, and Joan Solà In the present mainstream cosmology, matter and space-time emerged from a singularity and evolved through four distinct periods: early inflation, radiation, dark matter, and late-time inflation (driven by dark energy). During the radiation and dark matter dominated stages, the universe is decelerati... [Phys. Rev. D 88, 063531] Published Thu Sep 26, 2013

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Multispinon Continua at Zero and Finite Temperature in a Near-Ideal Heisenberg Chain (2013)

B. Lake, D. A. Tennant, J.-S. Caux, T. Barthel, U. Schollwöck, S. E. Nagler, and C. D. Frost

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): B. Lake, D. A. Tennant, J.-S. Caux, T. Barthel, U. Schollwöck, S. E. Nagler, and C. D. Frost The space-and time-dependent response of many-body quantum systems is the most informative aspect of their emergent behavior. The dynamical structure factor, experimentally measurable using neutron scattering, can map this response in wave vector and energy with great detail, allowing theories to be... [Phys. Rev. Lett. 111, 137205] Published Thu Sep 26, 2013

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Charge Qubit Coupled to an Intense Microwave Electromagnetic Field in a Superconducting Nb Device: Evidence for Photon-Assisted Quasiparticle Tunneling (2013)

S. E. de Graaf, J. Leppäkangas, A. Adamyan, A. V. Danilov, T. Lindström, M. Fogelström, T. Bauch, G. Johansson, and S. E. Kubatkin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): S. E. de Graaf, J. Leppäkangas, A. Adamyan, A. V. Danilov, T. Lindström, M. Fogelström, T. Bauch, G. Johansson, and S. E. Kubatkin We study a superconducting charge qubit coupled to an intensive electromagnetic field and probe changes in the resonance frequency of the formed dressed states. At large driving strengths, exceeding the qubit energy-level splitting, this reveals the well known Landau-Zener-Stückelberg interference s... [Phys. Rev. Lett. 111, 137002] Published Thu Sep 26, 2013

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Chirality Dependence of the Absorption Cross Section of Carbon Nanotubes (2013)

Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin, and Jean-Sébastien Lauret

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Fabien Vialla, Cyrielle Roquelet, Benjamin Langlois, Géraud Delport, Silvia Morim Santos, Emmanuelle Deleporte, Philippe Roussignol, Claude Delalande, Christophe Voisin, and Jean-Sébastien Lauret The variation of the optical absorption of carbon nanotubes with their geometry has been a long-standing question at the heart of both metrological and applicative issues, in particular because optical spectroscopy is one of the primary tools for the assessment of the chiral species abundance of sam... [Phys. Rev. Lett. 111, 137402] Published Thu Sep 26, 2013

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Quantized Conductance and Switching in Percolating Nanoparticle Films (2013)

Abdul Sattar, Shawn Fostner, and Simon A. Brown

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Abdul Sattar, Shawn Fostner, and Simon A. Brown We demonstrate switching behavior and quantized conductance at room temperature in percolating films of nanoparticles. Our experiments and complementary simulations show that switching and quantization result from the formation of atomic-scale wires in the gaps between particles. These effects occur... [Phys. Rev. Lett. 111, 136808] Published Thu Sep 26, 2013

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Shot-Noise Signatures of Charge Fractionalization in the ν=2 Quantum Hall Edge (2013)

Mirco Milletarì and Bernd Rosenow

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Mirco Milletarì and Bernd Rosenow We investigate the effect of interactions on shot noise in ν =2 quantum Hall edges, where a repulsive coupling between copropagating edge modes is expected to give rise to charge fractionalization. Using the method of nonequilibrium bosonization, we find that even asymptotically the edge distribution... [Phys. Rev. Lett. 111, 136807] Published Thu Sep 26, 2013

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Magnetization of SrCu_{2}(BO_{3})_{2} in Ultrahigh Magnetic Fields up to 118 T (2013)

Y. H. Matsuda, N. Abe, S. Takeyama, H. Kageyama, P. Corboz, A. Honecker, S. R. Manmana, G. R. Foltin, K. P. Schmidt, and F. Mila

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Y. H. Matsuda, N. Abe, S. Takeyama, H. Kageyama, P. Corboz, A. Honecker, S. R. Manmana, G. R. Foltin, K. P. Schmidt, and F. Mila The magnetization process of the orthogonal-dimer antiferromagnet SrCu 2 (BO 3 ) 2 is investigated in high magnetic fields of up to 118 T. A 1/2 plateau is clearly observed in the field range 84 to 108 T in addition to 1/8, 1/4, and 1/3 plateaus at lower fields. Using a combination of state-of-the-art nu... [Phys. Rev. Lett. 111, 137204] Published Thu Sep 26, 2013

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Fate of CP^{N-1} Fixed Points with q Monopoles (2013)

Matthew S. Block, Roger G. Melko, and Ribhu K. Kaul

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Matthew S. Block, Roger G. Melko, and Ribhu K. Kaul We present an extensive quantum Monte Carlo study of the Néel to valence-bond solid (VBS) phase transition on rectangular- and honeycomb-lattice SU( N ) antiferromagnets in sign-problem-free models. We find that in contrast to the honeycomb lattice and previously studied square-lattice systems, on the... [Phys. Rev. Lett. 111, 137202] Published Thu Sep 26, 2013

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Evidence for Long-Range Spin Order Instead of a Peierls Transition in Si(553)-Au Chains (2013)

J. Aulbach, J. Schäfer, S. C. Erwin, S. Meyer, C. Loho, J. Settelein, and R. Claessen

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): J. Aulbach, J. Schäfer, S. C. Erwin, S. Meyer, C. Loho, J. Settelein, and R. Claessen Stabilization of the Si(553) surface by Au adsorption results in two different atomically defined chain types, one of Au atoms and one of Si. At low temperature these chains develop two- and threefold periodicity, respectively, previously attributed to Peierls instabilities. Here we report evidence ... [Phys. Rev. Lett. 111, 137203] Published Thu Sep 26, 2013

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Constraints on neutrino density and velocity isocurvature modes from WMAP-9 data (2013)

Matti Savelainen, Jussi Väliviita, Parampreet Walia, Stanislav Rusak, and Hannu Kurki-Suonio

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Matti Savelainen, Jussi Väliviita, Parampreet Walia, Stanislav Rusak, and Hannu Kurki-Suonio We use WMAP-9 and other CMB data to constrain cosmological models where the primordial perturbations have both an adiabatic and a (possibly correlated) neutrino density (NDI), neutrino velocity (NVI), or cold dark matter density (CDI) isocurvature component. For NDI and CDI we use both a phenomenolo... [Phys. Rev. D 88, 063010] Published Fri Sep 27, 2013

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Gravitational waveforms for precessing, quasicircular compact binaries with multiple scale analysis: Small spin expansion (2013)

Katerina Chatziioannou, Antoine Klein, Nicolás Yunes, and Neil Cornish

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Katerina Chatziioannou, Antoine Klein, Nicolás Yunes, and Neil Cornish We obtain analytical gravitational waveforms in the frequency domain for precessing, quasicircular compact binaries with small spins, applicable, for example, to binary neutron star inspirals. We begin by calculating an analytic solution to the precession equations, obtained by expanding in the dime... [Phys. Rev. D 88, 063011] Published Fri Sep 27, 2013

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Cosmological constraints on holographic dark energy models under the energy conditions (2013)

Ming-Jian Zhang, Cong Ma, Zhi-Song Zhang, Zhong-Xu Zhai, and Tong-Jie Zhang

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Ming-Jian Zhang, Cong Ma, Zhi-Song Zhang, Zhong-Xu Zhai, and Tong-Jie Zhang We study the holographic and agegraphic dark energy models without interaction using the latest observational Hubble parameter data , the Union2.1 compilation of type Ia supernovae , and the energy conditions. Scenarios of dark energy are distinguished by the cutoff of cosmic age, conformal time, an... [Phys. Rev. D 88, 063534] Published Fri Sep 27, 2013

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General dissipative coefficient in warm intermediate and logamediate inflation (2013)

Ramón Herrera, Marco Olivares, and Nelson Videla

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Ramón Herrera, Marco Olivares, and Nelson Videla We study a general form for the dissipative coefficient Γ ( T , ϕ )= C ϕ T m / ϕ m -1 in the context of warm intermediate and logamediate inflationary universe models. We analyze these models in the weak and strong dissipative regimes. In the slow-roll approximation, we describe in great detail the characteristi... [Phys. Rev. D 88, 063535] Published Fri Sep 27, 2013

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Anomalous magnetohydrodynamics (2013)

Massimo Giovannini

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Massimo Giovannini Anomalous symmetries induce currents which can be parallel rather than orthogonal to the hypermagnetic field. Building on the analogy of charged liquids at high magnetic Reynolds numbers, the persistence of anomalous currents is scrutinized for parametrically large conductivities when the plasma app... [Phys. Rev. D 88, 063536] Published Fri Sep 27, 2013

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The effect of covariance estimator error on cosmological parameter constraints (2013)

Scott Dodelson and Michael D. Schneider

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Scott Dodelson and Michael D. Schneider Extracting parameter constraints from cosmological observations requires accurate determination of the covariance matrix for use in the likelihood function. We show here that uncertainties in the elements of the covariance matrix propagate directly to increased uncertainties in cosmological paramete... [Phys. Rev. D 88, 063537] Published Fri Sep 27, 2013

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Neutrino anisotropies after Planck (2013)

Martina Gerbino, Eleonora Di Valentino, and Najla Said

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Martina Gerbino, Eleonora Di Valentino, and Najla Said We present new constraints on the rest-frame sound speed, c eff 2 , and the viscosity parameter, c vis 2 , of the cosmic neutrino background from the recent measurements of the cosmic microwave background anisotropies provided by the Planck satellite. While broadly consistent with the expectations of c eff ... [Phys. Rev. D 88, 063538] Published Fri Sep 27, 2013

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Collective Spin Hall Effect for Electron-Hole Gratings (2013)

Ka Shen and G. Vignale

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Ka Shen and G. Vignale We show that an electric field parallel to the wave fronts of an electron-hole grating in a GaAs quantum well generates, via the electronic spin Hall effect, a spin grating of the same wave vector and with an amplitude that can exceed 1% of the amplitude of the initial density grating. We refer to t... [Phys. Rev. Lett. 111, 136602] Published Fri Sep 27, 2013

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Joint analysis of CMB temperature and lensing-reconstruction power spectra (2013)

Marcel M. Schmittfull, Anthony Challinor, Duncan Hanson, and Antony Lewis

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Marcel M. Schmittfull, Anthony Challinor, Duncan Hanson, and Antony Lewis Gravitational lensing provides a significant source of cosmological information in modern cosmic microwave background parameter analyses. It is measured in both the power spectrum and trispectrum of the temperature fluctuations. These observables are often treated as independent, although as they ar... [Phys. Rev. D 88, 063012] Published Mon Sep 30, 2013

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Obtaining the CMB anomalies with a bounce from the contracting phase to inflation (2013)

Zhi-Guo Liu, Zong-Kuan Guo, and Yun-Song Piao

American Physical Society (APS)

In: Physical Review D

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Beschreibung: Author(s): Zhi-Guo Liu, Zong-Kuan Guo, and Yun-Song Piao Recent Planck data show the anomalies of cosmic microwave background (CMB) fluctuations on large angular scales, which confirms the early observations by WMAP. We continue studying an inflationary model, in which before the slow-roll inflation the universe is in a contracting phase, and fit the mode... [Phys. Rev. D 88, 063539] Published Mon Sep 30, 2013

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Metamaterial Transparency Induced by Cooperative Electromagnetic Interactions (2013)

Stewart D. Jenkins and Janne Ruostekoski

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Stewart D. Jenkins and Janne Ruostekoski We propose a cooperative asymmetry-induced transparency, CAIT, formed by collective excitations in metamaterial arrays of discrete resonators. CAIT can display a sharp transmission resonance even when the constituent resonators individually exhibit broad resonances. We further show how dynamically r... [Phys. Rev. Lett. 111, 147401] Published Mon Sep 30, 2013

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Fermat’s least-time principle and the embedded transparent lens (2013)

R. Kantowski, B. Chen, and X. Dai

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): R. Kantowski, B. Chen, and X. Dai We present a simplified version of the lowest-order embedded point mass gravitational lens theory and then make the extension of this theory to any embedded transparent lens. Embedding a lens effectively reduces the gravitational potential’s range, i.e., partially shields the lensing potential becau... [Phys. Rev. D 88, 083001] Published Tue Oct 01, 2013

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Peculiar Raychaudhuri equation (2013)

Christos G. Tsagas and Miltiadis I. Kadiltzoglou

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Christos G. Tsagas and Miltiadis I. Kadiltzoglou Peculiar motions are commonplace in the Universe. Our local group of galaxies, for example, drifts relative to the Hubble flow at about 600 km/sec⁡. Such bulk flows are believed to fade away as we move on to progressively larger scales. Recently, however, there have been reports of peculiar motions... [Phys. Rev. D 88, 083501] Published Tue Oct 01, 2013

Schlagwort(e): Astrophysics & Cosmology

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Conductivity of Graphene with Resonant and Nonresonant Adsorbates (2013)

Guy Trambly de Laissardière and Didier Mayou

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Guy Trambly de Laissardière and Didier Mayou We propose a unified description of transport in graphene with adsorbates that fully takes into account localization effects and loss of electronic coherence due to inelastic processes. We focus in particular on the role of the scattering properties of the adsorbates and analyze in detail cases with... [Phys. Rev. Lett. 111, 146601] Published Tue Oct 01, 2013

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Interplay between Classical Magnetic Moments and Superconductivity in Quantum One-Dimensional Conductors: Toward a Self-Sustained Topological Majorana Phase (2013)

Bernd Braunecker and Pascal Simon

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Bernd Braunecker and Pascal Simon We study a one-dimensional interacting electronic liquid coupled to a 1D array of classical magnetic moments and to a superconductor. We show that at low energy and temperature the magnetic moments and the electrons become strongly entangled and that a magnetic spiral structure emerges. For strong e... [Phys. Rev. Lett. 111, 147202] Published Tue Oct 01, 2013

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The Observed squeezed limit of cosmological three-point functions (2013)

Enrico Pajer, Fabian Schmidt, and Matias Zaldarriaga

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Enrico Pajer, Fabian Schmidt, and Matias Zaldarriaga The squeezed limit of the three-point function of cosmological perturbations is a powerful discriminant of different models of the early Universe. We present a conceptually simple and complete framework to relate any primordial bispectrum in this limit to late time observables, such as the cosmic mi... [Phys. Rev. D 88, 083502] Published Tue Oct 01, 2013

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Exciton-Polariton Gap Solitons in Two-Dimensional Lattices (2013)

E. A. Cerda-Méndez, D. Sarkar, D. N. Krizhanovskii, S. S. Gavrilov, K. Biermann, M. S. Skolnick, and P. V. Santos

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): E. A. Cerda-Méndez, D. Sarkar, D. N. Krizhanovskii, S. S. Gavrilov, K. Biermann, M. S. Skolnick, and P. V. Santos We report on the two-dimensional gap-soliton nature of exciton-polariton macroscopic coherent phases (PMCP) in a square lattice with a tunable amplitude. The resonantly excited PMCP forms close to the negative mass M point of the lattice band structure with energy within the lattice band gap and its... [Phys. Rev. Lett. 111, 146401] Published Wed Oct 02, 2013

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Quantum Transport in Magnetic Topological Insulator Thin Films (2013)

Hai-Zhou Lu, An Zhao, and Shun-Qing Shen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Hai-Zhou Lu, An Zhao, and Shun-Qing Shen The experimental observation of the long-sought quantum anomalous Hall effect was recently reported in magnetically doped topological insulator thin films [Chang et al. , Science 340 167 (2013) ]. An intriguing observation is a rapid decrease from the quantized plateau in the Hall conductance, accom... [Phys. Rev. Lett. 111, 146802] Published Wed Oct 02, 2013

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Engineering Topological Surface States: HgS, HgSe, and HgTe (2013)

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

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): François Virot, Roland Hayn, Manuel Richter, and Jeroen van den Brink Using density functional electronic structure calculations, we establish the consequences of surface termination and modification on protected surface states of metacinnabar ( β -HgS). Whereas we find that the Dirac cone is isotropic and well separated from the valence band for the (110) surface, it i... [Phys. Rev. Lett. 111, 146803] Published Wed Oct 02, 2013

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Fundamental Differences between Quantum Spin Hall Edge States at Zigzag and Armchair Terminations of Honeycomb and Ruby Nets (2013)

Laura Cano-Cortés, Carmine Ortix, and Jeroen van den Brink

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Laura Cano-Cortés, Carmine Ortix, and Jeroen van den Brink Combining an analytical and numerical approach we investigate the dispersion of the topologically protected spin-filtered edge states of the quantum spin Hall state on honeycomb and ruby nets with zigzag (ZZ) and armchair (AC) edges. We show that the Fermi velocity of the helical edge states on ZZ e... [Phys. Rev. Lett. 111, 146801] Published Wed Oct 02, 2013

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Local Spin Relaxation within the Random Heisenberg Chain (2013)

J. Herbrych, J. Kokalj, and P. Prelovšek

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): J. Herbrych, J. Kokalj, and P. Prelovšek Finite-temperature local dynamical spin correlations S n n ( ω ) are studied numerically within the random spin-1/2 antiferromagnetic Heisenberg chain. The aim is to explain measured NMR spin-lattice relaxation times in BaCu 2 (Si 0.5 Ge 0.5 ) 2 O 7 , which is the realization of a random spin chain. In agreement w... [Phys. Rev. Lett. 111, 147203] Published Wed Oct 02, 2013

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Quantum Bicriticality in the Heavy-Fermion Metamagnet YbAgGe (2013)

Y. Tokiwa, M. Garst, P. Gegenwart, S. L. Bud’ko, and P. C. Canfield

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Y. Tokiwa, M. Garst, P. Gegenwart, S. L. Bud’ko, and P. C. Canfield Bicritical points, at which two distinct symmetry-broken phases become simultaneously unstable, are typical for spin-flop metamagnetism. Interestingly, the heavy-fermion compound YbAgGe also possesses such a bicritical point (BCP) with a low temperature T BCP ≈0.3 K at a magnetic field of μ 0 H BCP ≈4.5 ... [Phys. Rev. Lett. 111, 116401] Published Mon Sep 09, 2013

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^{7}Be charge exchange between ^{7}Be^{3+} ion and an exotic long-lived negatively charged massive particle in big bang nucleosynthesis (2013)

Motohiko Kusakabe, K. S. Kim, Myung-Ki Cheoun, Toshitaka Kajino, and Yasushi Kino

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Motohiko Kusakabe, K. S. Kim, Myung-Ki Cheoun, Toshitaka Kajino, and Yasushi Kino The existence of an exotic long-lived negatively charged massive particle, i.e., X - , during big bang nucleosynthesis can affect primordial light element abundances. In particular, the final abundance of 7 Li, mainly originating from the electron capture of 7 Be, has been suggested to be made smaller b... [Phys. Rev. D 88, 063514] Published Tue Sep 10, 2013

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No-go theorem for static scalar field dark matter halos with no Noether charges (2013)

Alberto Diez-Tejedor and Alma X. Gonzalez-Morales

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Alberto Diez-Tejedor and Alma X. Gonzalez-Morales Classical scalar fields have been considered as a possible effective description of dark matter. We show that, for any metric theory of gravity, no static, spherically symmetric, regular, spatially localized, attractive, stable spacetime configuration can be sourced by the coherent excitation of a s... [Phys. Rev. D 88, 067302] Published Tue Sep 10, 2013

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Hidden T-Linear Scattering Rate in Ba_{0.6}K_{0.4}Fe_{2}As_{2} Revealed by Optical Spectroscopy (2013)

Y. M. Dai, B. Xu, B. Shen, H. Xiao, H. H. Wen, X. G. Qiu, C. C. Homes, and R. P. S. M. Lobo

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Y. M. Dai, B. Xu, B. Shen, H. Xiao, H. H. Wen, X. G. Qiu, C. C. Homes, and R. P. S. M. Lobo The optical properties of Ba 0.6 K 0.4 Fe 2 As 2 have been determined in the normal state for a number of temperatures over a wide frequency range. Two Drude terms, representing two groups of carriers with different scattering rates (1/ τ ), well describe the real part of the optical conductivity σ 1 ( ω ). A “b... [Phys. Rev. Lett. 111, 117001] Published Tue Sep 10, 2013

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Engineering Correlation Effects via Artificially Designed Oxide Superlattices (2013)

Hanghui Chen, Andrew J. Millis, and Chris A. Marianetti

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Hanghui Chen, Andrew J. Millis, and Chris A. Marianetti Ab initio calculations are used to predict that a superlattice composed of layers of LaTiO 3 and LaNiO 3 alternating along the [001] direction is a S =1 Mott insulator with large magnetic moments on the Ni sites, negligible moments on the Ti sites and a charge transfer gap set by the energy difference ... [Phys. Rev. Lett. 111, 116403] Published Tue Sep 10, 2013

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Condensed Astatine: Monatomic and Metallic (2013)

Andreas Hermann, Roald Hoffmann, and N. W. Ashcroft

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Andreas Hermann, Roald Hoffmann, and N. W. Ashcroft The condensed matter properties of the nominal terminating element of the halogen group with atomic number 85, astatine, are as yet unknown. In the intervening more than 70 years since its discovery significant advances have been made in substrate cooling and the other techniques necessary for the p... [Phys. Rev. Lett. 111, 116404] Published Thu Sep 12, 2013

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Milli-interacting dark matter (2013)

Quentin Wallemacq

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Quentin Wallemacq We present a dark matter model reproducing well the results from DAMA/LIBRA and CoGeNT and having no contradiction with the negative results from XENON100 and CDMS-II/Ge. Two new species of fermions F and G form hydrogenlike atoms with standard atomic size through a dark U (1) gauge interaction carri... [Phys. Rev. D 88, 063516] Published Thu Sep 12, 2013

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Dark energy from cosmological fluids obeying a Shan-Chen nonideal equation of state (2013)

Donato Bini, Andrea Geralico, Daniele Gregoris, and Sauro Succi

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Donato Bini, Andrea Geralico, Daniele Gregoris, and Sauro Succi We consider a Friedmann-Robertson-Walker universe with a fluid source obeying a nonideal equation of state with ‘‘asymptotic freedom,” namely ideal gas behavior (pressure changes directly proportional to density changes) both at low and high density regimes, following a fluid dynamical model due to ... [Phys. Rev. D 88, 063007] Published Thu Sep 12, 2013

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Emergent Friedmann equation from the evolution of cosmic space revisited (2013)

Myungseok Eune and Wontae Kim

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Myungseok Eune and Wontae Kim Following the recent study on the emergent Friedmann equation from the expansion of cosmic space for a flat universe, we apply this method to a nonflat universe, and modify the evolution equation to lead to the Friedmann equation. In order to maintain the same form with the original evolution equati... [Phys. Rev. D 88, 067303] Published Tue Sep 17, 2013

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γ gravity: Steepness control (2013)

Márcio O’Dwyer, Sérgio E. Jorás, and Ioav Waga

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Márcio O’Dwyer, Sérgio E. Jorás, and Ioav Waga We investigate a simple generalization of the metric exponential f ( R ) gravity theory that is cosmologically viable and compatible with solar system tests of gravity. We show that, as compared to other viable f ( R ) theories, its steep dependence on the Ricci scalar R facilitates agreement with structu... [Phys. Rev. D 88, 063520] Published Tue Sep 17, 2013

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Dynamical systems approach to a Bianchi type I viscous magnetohydrodynamic model (2013)

Ikjyot Singh Kohli and Michael C. Haslam

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Ikjyot Singh Kohli and Michael C. Haslam We use the expansion-normalized variables approach to study the dynamics of a nontilted Bianchi type I cosmological model with both a homogeneous magnetic field and a viscous fluid. In our model the perfect magnetohydrodynamic approximation is made, and both bulk and shear viscous effects are retain... [Phys. Rev. D 88, 063518] Published Tue Sep 17, 2013

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Hierarchy of Fractional Chern Insulators and Competing Compressible States (2013)

A. M. Läuchli, Zhao Liu, E. J. Bergholtz, and R. Moessner

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): A. M. Läuchli, Zhao Liu, E. J. Bergholtz, and R. Moessner We study the phase diagram of interacting electrons in a dispersionless Chern band as a function of their filling. We find hierarchy multiplets of incompressible states at fillings ν =1/3, 2/5, 3/7, 4/9, 5/9, 4/7, 3/5 as well as ν =1/5, 2/7. These are accounted for by an analogy to Haldane pseudopoten... [Phys. Rev. Lett. 111, 126802] Published Tue Sep 17, 2013

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Spin-Orbit Splitting in Single-Layer MoS_{2} Revealed by Triply Resonant Raman Scattering (2013)

Linfeng Sun, Jiaxu Yan, Da Zhan, Lei Liu, Hailong Hu, Hong Li, Ben Kang Tay, Jer-Lai Kuo, Chung-Che Huang, Daniel W. Hewak, Pooi See Lee, and Ze Xiang Shen

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Linfeng Sun, Jiaxu Yan, Da Zhan, Lei Liu, Hailong Hu, Hong Li, Ben Kang Tay, Jer-Lai Kuo, Chung-Che Huang, Daniel W. Hewak, Pooi See Lee, and Ze Xiang Shen Although new spintronic devices based on the giant spin-orbit splitting of single-layer MoS 2 have been proposed, such splitting has not been studied effectively in experiments. This Letter reports the valence band spin-orbit splitting in single-layer MoS 2 for the first time, probed by the triply res... [Phys. Rev. Lett. 111, 126801] Published Tue Sep 17, 2013

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Hall Drag and Magnetodrag in Graphene (2013)

Justin C. W. Song and Leonid S. Levitov

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): Justin C. W. Song and Leonid S. Levitov Massless Dirac fermions in graphene at charge neutrality form a strongly interacting system in which both charged and neutral (energy) modes play an important role. These modes are essentially decoupled in the absence of a magnetic field, but become strongly coupled when the field is applied. We sho... [Phys. Rev. Lett. 111, 126601] Published Tue Sep 17, 2013

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Layer-by-Layer Evolution of a Two-Dimensional Electron Gas Near an Oxide Interface (2013)

Young Jun Chang, Luca Moreschini, Aaron Bostwick, Geoffrey A. Gaines, Yong Su Kim, Andrew L. Walter, Byron Freelon, Antonello Tebano, Karsten Horn, and Eli Rotenberg

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Young Jun Chang, Luca Moreschini, Aaron Bostwick, Geoffrey A. Gaines, Yong Su Kim, Andrew L. Walter, Byron Freelon, Antonello Tebano, Karsten Horn, and Eli Rotenberg We report the momentum-resolved measurement of a two-dimensional electron gas at the LaTiO 3 /SrTiO 3 interface by angle-resolved photoemission spectroscopy (ARPES). Thanks to an advanced sample preparation technique, the orbital character of the conduction electrons and the electronic correlations can... [Phys. Rev. Lett. 111, 126401] Published Wed Sep 18, 2013

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Tuning the Competition between Ferromagnetism and Antiferromagnetism in a Half-Doped Manganite through Magnetoelectric Coupling (2013)

Di Yi, Jian Liu, Satoshi Okamoto, Suresha Jagannatha, Yi-Chun Chen, Pu Yu, Ying-Hao Chu, Elke Arenholz, and R. Ramesh

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Di Yi, Jian Liu, Satoshi Okamoto, Suresha Jagannatha, Yi-Chun Chen, Pu Yu, Ying-Hao Chu, Elke Arenholz, and R. Ramesh We investigate the possibility of controlling the magnetic phase transition of the heterointerface between a half-doped manganite La 0.5 Ca 0.5 MnO 3 and a multiferroic BiFeO 3 (BFO) through magnetoelectric coupling. Using macroscopic magnetometry and element-selective x-ray magnetic circular dichroism at... [Phys. Rev. Lett. 111, 127601] Published Wed Sep 18, 2013

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Interatomic Exchange Interactions for Finite-Temperature Magnetism and Nonequilibrium Spin Dynamics (2013)

A. Szilva, M. Costa, A. Bergman, L. Szunyogh, L. Nordström, and O. Eriksson

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): A. Szilva, M. Costa, A. Bergman, L. Szunyogh, L. Nordström, and O. Eriksson We derive ab inito exchange parameters for general noncollinear magnetic configurations, in terms of a multiple scattering formalism. We show that the general exchange formula has an anisotropiclike term even in the absence of spin-orbit coupling, and that this term is large, for instance, for colli... [Phys. Rev. Lett. 111, 127204] Published Wed Sep 18, 2013

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Conformal stealth for any standard cosmology (2013)

Eloy Ayón-Beato, Alberto A. García, P. Isaac Ramírez-Baca, and César A. Terrero-Escalante

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Eloy Ayón-Beato, Alberto A. García, P. Isaac Ramírez-Baca, and César A. Terrero-Escalante It is shown that any homogeneous and isotropic universe, independently of its spatial topology and matter content, allows for the presence of a conformal stealth, i.e., a nontrivial conformally invariant scalar field with vanishing energy-momentum tensor, which evolves along with the universe withou... [Phys. Rev. D 88, 063523] Published Thu Sep 19, 2013

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Emergent Heavy Fermion Behavior at the Wigner-Mott Transition (2013)

Jaime Merino, Arnaud Ralko, and Simone Fratini

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Jaime Merino, Arnaud Ralko, and Simone Fratini We study charge ordering driven by Coulomb interactions on triangular lattices relevant to the Wigner-Mott transition in two dimensions. Dynamical mean-field theory reveals the pinball liquid phase, a charge ordered metallic phase containing quasilocalized (pins) coexisting with itinerant (balls) el... [Phys. Rev. Lett. 111, 126403] Published Fri Sep 20, 2013

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Polarization Sensitive Surface Band Structure of Doped BaTiO_{3}(001) (2013)

J. E. Rault, J. Dionot, C. Mathieu, V. Feyer, C. M. Schneider, G. Geneste, and N. Barrett

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): J. E. Rault, J. Dionot, C. Mathieu, V. Feyer, C. M. Schneider, G. Geneste, and N. Barrett We present a spatial and wave-vector resolved study of the electronic structure of micron sized ferroelectric domains at the surface of a BaTiO 3 (001) single crystal. The n -type doping of the BaTiO 3 is controlled by in situ vacuum and oxygen annealing, providing experimental evidence of a surface par... [Phys. Rev. Lett. 111, 127602] Published Fri Sep 20, 2013

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High Cooperativity in Coupled Microwave Resonator Ferrimagnetic Insulator Hybrids (2013)

Hans Huebl, Christoph W. Zollitsch, Johannes Lotze, Fredrik Hocke, Moritz Greifenstein, Achim Marx, Rudolf Gross, and Sebastian T. B. Goennenwein

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Hans Huebl, Christoph W. Zollitsch, Johannes Lotze, Fredrik Hocke, Moritz Greifenstein, Achim Marx, Rudolf Gross, and Sebastian T. B. Goennenwein We report the observation of strong coupling between the exchange-coupled spins in a gallium-doped yttrium iron garnet and a superconducting coplanar microwave resonator made from Nb. The measured coupling rate of 450 MHz is proportional to the square root of the number of exchange-coupled spins and... [Phys. Rev. Lett. 111, 127003] Published Fri Sep 20, 2013

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Embedding nonrelativistic physics inside a gravitational wave (2013)

Xavier Bekaert and Kevin Morand

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Xavier Bekaert and Kevin Morand Gravitational waves with parallel rays are known to have remarkable properties: their orbit space of null rays possesses the structure of a nonrelativistic spacetime of codimension-1. Their geodesics are in one-to-one correspondence with dynamical trajectories of a nonrelativistic system. Similarly,... [Phys. Rev. D 88, 063008] Published Fri Sep 20, 2013

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Ballistic Spreading of Entanglement in a Diffusive Nonintegrable System (2013)

Hyungwon Kim and David A. Huse

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Hyungwon Kim and David A. Huse We study the time evolution of the entanglement entropy of a one-dimensional nonintegrable spin chain, starting from random nonentangled initial pure states. We use exact diagonalization of a nonintegrable quantum Ising chain with transverse and longitudinal fields to obtain the exact quantum dynami... [Phys. Rev. Lett. 111, 127205] Published Fri Sep 20, 2013

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Searching for the high-energy neutrino counterpart signals: The case of the Fermi bubbles signal and of dark matter annihilation in the inner Galaxy (2013)

Ilias Cholis

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Ilias Cholis The recent uncovering of the Fermi bubbles/haze in the Fermi γ -ray data has generated theoretical work to explain such a signal of hard γ rays in combination with the WMAP haze signal. Many of these theoretical models can have distinctively different implications with regards to the production of hi... [Phys. Rev. D 88, 063524] Published Mon Sep 23, 2013

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Off-Diagonal Bethe Ansatz and Exact Solution of a Topological Spin Ring (2013)

Junpeng Cao, Wen-Li Yang, Kangjie Shi, and Yupeng Wang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Junpeng Cao, Wen-Li Yang, Kangjie Shi, and Yupeng Wang A general method is proposed for constructing the Bethe ansatz equations of integrable models without U (1) symmetry. As an example, the exact spectrum of the X X Z spin ring with a Möbius-like topological boundary condition is derived by constructing a modified T - Q relation based on the functional con... [Phys. Rev. Lett. 111, 137201] Published Mon Sep 23, 2013

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Parametrizing dark sector perturbations via equations of state (2013)

Richard A. Battye and Jonathan A. Pearson

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Richard A. Battye and Jonathan A. Pearson The evolution of perturbations is a crucial part of the phenomenology of the dark sector cosmology. We advocate parametrizing these perturbations using equations of state for the entropy perturbation and the anisotropic stress. For small perturbations, these equations of state will be linear in the ... [Phys. Rev. D 88, 061301] Published Wed Sep 25, 2013

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Gauge field preheating at the end of inflation (2013)

J. Tate Deskins, John T. Giblin, Jr., and Robert R. Caldwell

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): J. Tate Deskins, John T. Giblin, Jr., and Robert R. Caldwell Here we consider the possibility of preheating the Universe via the parametric amplification of a massless, U (1) Abelian gauge field. We assume that the gauge field is coupled to the inflaton via a dilaton-like coupling, a conformal factor with one free parameter. We present the results of high-reso... [Phys. Rev. D 88, 063530] Published Wed Sep 25, 2013

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Intermediate homogenization of the Universe and the problem of gravitational entropy (2013)

Krzysztof Bolejko and William R. Stoeger

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Krzysztof Bolejko and William R. Stoeger This paper studies intermediate homogenization of inhomogeneous cosmological models. It shows that spherically symmetric models, regardless of the equation of state, can undergo intermediate homogenization; i.e., a model can approach a homogeneous and isotropic state (which acts as a saddle point) f... [Phys. Rev. D 88, 063529] Published Wed Sep 25, 2013

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Thermopower in the Quantum Hall Regime (2013)

N. d’Ambrumenil and R. H. Morf

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): N. d’Ambrumenil and R. H. Morf We consider the effect of disorder on the themopower in quantum Hall systems. For a sample in the Corbino geometry, where dissipative currents are not carried by edge states, we find that thermopower behaves at high temperatures like a system with a gap and has a maximum which increases as the tempe... [Phys. Rev. Lett. 111, 136805] Published Wed Sep 25, 2013

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Transport Signatures of Floquet Majorana Fermions in Driven Topological Superconductors (2013)

Arijit Kundu and Babak Seradjeh

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Arijit Kundu and Babak Seradjeh Floquet Majorana fermions are steady states of equal superposition of electrons and holes in a periodically driven superconductor. We study the experimental signatures of Floquet Majorana fermions in transport measurements and show, both analytically and numerically, that their presence is signaled ... [Phys. Rev. Lett. 111, 136402] Published Wed Sep 25, 2013

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Chiral Edge States and Fractional Charge Separation in a System of Interacting Bosons on a Kagome Lattice (2013)

Xue-Feng Zhang (张学锋) and Sebastian Eggert

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Xue-Feng Zhang (张学锋) and Sebastian Eggert We consider the extended hard-core Bose-Hubbard model on a kagome lattice with boundary conditions on two edges. We find that the sharp edges lift the degeneracy and freeze the system into a striped order at 1/3 and 2/3 filling for zero hopping. At small hopping strengths, holes spontaneously appear... [Phys. Rev. Lett. 111, 147201] Published Mon Sep 30, 2013

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Competing Crystal Phases in the Lowest Landau Level (2013)

Alexander C. Archer, Kwon Park, and Jainendra K. Jain

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Alexander C. Archer, Kwon Park, and Jainendra K. Jain We show that the solid phase between the 1/5 and 2/9 fractional quantum Hall states arises from an extremely delicate interplay between type-1 and type-2 composite fermion crystals, clearly demonstrating its nontrivial, strongly correlated character. We also compute the phase diagram of various crys... [Phys. Rev. Lett. 111, 146804] Published Wed Oct 02, 2013

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Charge Ordering in a Pure Spin Model: Dipolar Spin Ice (2013)

R. A. Borzi, D. Slobinsky, and S. A. Grigera

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): R. A. Borzi, D. Slobinsky, and S. A. Grigera We study the dipolar spin-ice model at fixed density of single excitations, ρ , using a Monte Carlo algorithm where processes of creation and annihilation of such excitations are banned. In the limit of ρ going to zero, this model coincides with the usual dipolar spin-ice model at low temperatures, w... [Phys. Rev. Lett. 111, 147204] Published Wed Oct 02, 2013

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Excitation of Single Quasiparticles in a Small Superconducting Al Island Connected to Normal-Metal Leads by Tunnel Junctions (2013)

V. F. Maisi, S. V. Lotkhov, A. Kemppinen, A. Heimes, J. T. Muhonen, and J. P. Pekola

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): V. F. Maisi, S. V. Lotkhov, A. Kemppinen, A. Heimes, J. T. Muhonen, and J. P. Pekola We investigate the dynamics of individual quasiparticle excitations on a small superconducting aluminum island connected to normal metallic leads by tunnel junctions. We find the island to be free of excitations within the measurement resolution. This allows us to show that the residual heating, whi... [Phys. Rev. Lett. 111, 147001] Published Thu Oct 03, 2013

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Probing Real-Space and Time-Resolved Correlation Functions with Many-Body Ramsey Interferometry (2013)

Michael Knap, Adrian Kantian, Thierry Giamarchi, Immanuel Bloch, Mikhail D. Lukin, and Eugene Demler

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Michael Knap, Adrian Kantian, Thierry Giamarchi, Immanuel Bloch, Mikhail D. Lukin, and Eugene Demler We propose to use Ramsey interferometry and single-site addressability, available in synthetic matter such as cold atoms or trapped ions, to measure real-space and time-resolved spin correlation functions. These correlation functions directly probe the excitations of the system, which makes it possi... [Phys. Rev. Lett. 111, 147205] Published Fri Oct 04, 2013

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Lagrangian theory of structure formation in relativistic cosmology. II. Average properties of a generic evolution model (2013)

Thomas Buchert, Charly Nayet, and Alexander Wiegand

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Thomas Buchert, Charly Nayet, and Alexander Wiegand Kinematical and dynamical properties of a generic inhomogeneous cosmological model, spatially averaged with respect to free-falling (generalized fundamental) observers, are investigated for the matter model “irrotational dust.” Paraphrasing a previous Newtonian investigation, we present a relativist... [Phys. Rev. D 87, 123503] Published Wed Jun 05, 2013

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Quadratic isocurvature cross-correlation, Ward identity, and dark matter (2013)

Daniel J. H. Chung, Hojin Yoo, and Peng Zhou

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Daniel J. H. Chung, Hojin Yoo, and Peng Zhou Sources of isocurvature perturbations and large non-Gaussianities include field degrees of freedom whose vacuum expectation values are smaller than the expansion rate of inflation. The inhomogeneities in the energy density of such fields are quadratic in the fields to leading order in the inhomogene... [Phys. Rev. D 87, 123502] Published Wed Jun 05, 2013

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EuFe_{2}(As_{1-x}P_{x})_{2}: Reentrant Spin Glass and Superconductivity (2013)

S. Zapf, H. S. Jeevan, T. Ivek, F. Pfister, F. Klingert, S. Jiang, D. Wu, P. Gegenwart, R. K. Kremer, and M. Dressel

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): S. Zapf, H. S. Jeevan, T. Ivek, F. Pfister, F. Klingert, S. Jiang, D. Wu, P. Gegenwart, R. K. Kremer, and M. Dressel By systematic investigations of the magnetic, transport, and thermodynamic properties of single crystals of EuFe 2 (As 1- x P x ) 2 (0≤ x ≤1), we explore the complex interplay of superconductivity and Eu 2+ magnetism. Below 30 K, two magnetic transitions are observed for all P substituted crystals, suggesting ... [Phys. Rev. Lett. 110, 237002] Published Wed Jun 05, 2013

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Disordered Weak and Strong Topological Insulators (2013)

Koji Kobayashi, Tomi Ohtsuki, and Ken-Ichiro Imura

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Koji Kobayashi, Tomi Ohtsuki, and Ken-Ichiro Imura A global phase diagram of disordered weak and strong topological insulators is established numerically. As expected, the location of the phase boundaries is renormalized by disorder, a feature recognized in the study of the so-called topological Anderson insulator. Here, we report unexpected quantiz... [Phys. Rev. Lett. 110, 236803] Published Wed Jun 05, 2013

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Quantum Critical Transition Amplifies Magnetoelastic Coupling in Mn[N(CN)_{2}]_{2} (2013)

T. V. Brinzari, P. Chen, Q.-C. Sun, J. Liu, L.-C. Tung, Y. Wang, J. A. Schlueter, J. Singleton, J. L. Manson, M.-H. Whangbo, A. P. Litvinchuk, and J. L. Musfeldt

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): T. V. Brinzari, P. Chen, Q.-C. Sun, J. Liu, L.-C. Tung, Y. Wang, J. A. Schlueter, J. Singleton, J. L. Manson, M.-H. Whangbo, A. P. Litvinchuk, and J. L. Musfeldt We report the discovery of a magnetic quantum critical transition in Mn[N(CN) 2 ] 2 that drives the system from a canted antiferromagnetic state to the fully polarized state with amplified magnetoelastic coupling as an intrinsic part of the process. The local lattice distortions, revealed through syste... [Phys. Rev. Lett. 110, 237202] Published Wed Jun 05, 2013

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Theory of the Spontaneous Optical Emission of Nanosize Photonic and Plasmon Resonators (2013)

C. Sauvan, J. P. Hugonin, I. S. Maksymov, and P. Lalanne

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): C. Sauvan, J. P. Hugonin, I. S. Maksymov, and P. Lalanne We provide a self-consistent electromagnetic theory of the coupling between dipole emitters and dissipative nanoresonators. The theory that relies on the concept of quasinormal modes with complex frequencies provides an accurate closed-form expression for the electromagnetic local density of states ... [Phys. Rev. Lett. 110, 237401] Published Wed Jun 05, 2013

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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Power spectrum super-sample covariance (2013)

Masahiro Takada and Wayne Hu

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Masahiro Takada and Wayne Hu We provide a simple, unified approach to describing the impact of super-sample covariance, or beat coupling, on power spectrum estimation in a finite-volume survey. For a wide range of survey volumes, the sample variance that arises from modes that are larger than the survey dominates the covariance... [Phys. Rev. D 87, 123504] Published Wed Jun 05, 2013

Schlagwort(e): Astrophysics & Cosmology

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

Publiziert von American Physical Society (APS)

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Verification of the Wiedemann-Franz Law in YbRh_{2}Si_{2} at a Quantum Critical Point (2013)

Y. Machida, K. Tomokuni, K. Izawa, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Y. Machida, K. Tomokuni, K. Izawa, G. Lapertot, G. Knebel, J.-P. Brison, and J. Flouquet The thermal conductivity measurements are performed on the heavy-fermion compound YbRh 2 Si 2 down to 0.04 K and under magnetic fields through a quantum critical point (QCP) at B c =0.66 T∥ c axis. In the limit as T →0, we find that the Wiedemann-Franz law is satisfied within experimental error at the QCP... [Phys. Rev. Lett. 110, 236402] Published Fri Jun 07, 2013

Schlagwort(e): Condensed Matter: Electronic Properties, etc.

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

Publiziert von American Physical Society (APS)

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K-oscillons: Oscillons with noncanonical kinetic terms (2013)

Mustafa A. Amin

American Physical Society (APS)

In: Physical Review D

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Mustafa A. Amin Oscillons are long-lived, localized, oscillatory scalar field configurations. In this work we derive a condition for the existence of small-amplitude oscillons (and provide solutions) in scalar field theories with noncanonical kinetic terms. While oscillons have been studied extensively in the canon... [Phys. Rev. D 87, 123505] Published Fri Jun 07, 2013

Schlagwort(e): Astrophysics & Cosmology

Print ISSN: 0556-2821

Digitale ISSN: 1089-4918

Thema: Physik

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