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Quantum phase transition with a simple variational ansatz (2014)

Y. Lutsyshyn, G. E. Astrakharchik, C. Cazorla, and J. Boronat

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Y. Lutsyshyn, G. E. Astrakharchik, C. Cazorla, and J. Boronat We study the zero-temperature quantum phase transition between liquid and hcp solid 4 He. We use the variational method with a simple yet exchange-symmetric and fully explicit wave function. It is found that the optimized wave function undergoes spontaneous symmetry breaking and describes the quantum... [Phys. Rev. B 90, 214512] Published Thu Dec 11, 2014

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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Meissner and mesoscopic superconducting states in 1–4 unit-cell FeSe films (2014)

L. Z. Deng, B. Lv, Z. Wu, Y. Y. Xue, W. H. Zhang, F. S. Li, L. L. Wang, X. C. Ma, Q. K. Xue, and C. W. Chu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): L. Z. Deng, B. Lv, Z. Wu, Y. Y. Xue, W. H. Zhang, F. S. Li, L. L. Wang, X. C. Ma, Q. K. Xue, and C. W. Chu We report a detailed investigation on the superconductivity in eight 1–4 unit-cell (UC) FeSe films on SrTiO 3 substrates by measuring their magnetization and sheet resistance in a field between 5×10 −2 and 7×10 4 Oe over the last one and a half years as a function of temperature and frequency, from 2 t... [Phys. Rev. B 90, 214513] Published Thu Dec 11, 2014

Schlagwort(e): Superfluidity and superconductivity

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Cluster algorithm for Monte Carlo simulations of spin ice (2014)

Hiromi Otsuka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Hiromi Otsuka We present an algorithm for Monte Carlo simulations of a nearest-neighbor spin-ice model based on its cluster representation. To assess its performance, we estimate a relaxation time, and find that, in contrast to the Metropolis algorithm, our algorithm does not develop spin freezing. Also, to demon... [Phys. Rev. B 90, 220406] Published Thu Dec 11, 2014

Schlagwort(e): Magnetism

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Markovian evolution of strongly coupled harmonic oscillators (2014)

Chaitanya Joshi, Patrik Öhberg, James D. Cresser, and Erika Andersson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Chaitanya Joshi, Patrik Öhberg, James D. Cresser, and Erika Andersson We investigate how to model Markovian evolution of coupled harmonic oscillators, each of them interacting with a local environment. When the coupling between the oscillators is weak, dissipation may be modeled using local Lindblad terms for each of the oscillators in the master equation, as is commo... [Phys. Rev. A 90, 063815] Published Thu Dec 11, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Thema: Physik

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Propagation of nanofiber-guided light through an array of atoms (2014)

Fam Le Kien and A. Rauschenbeutel

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Fam Le Kien and A. Rauschenbeutel We study the propagation of nanofiber-guided light through an array of atomic cesium, taking into account the transitions between the hyperfine levels 6S 1/2 F=4 and 6P 3/2 F ′ =5 of the D 2 line. We derive the coupled-mode propagation equation, the input-output equation, the scattering matrix, the transfe... [Phys. Rev. A 90, 063816] Published Mon Dec 15, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Universal scaling of the critical temperature for thin films near the superconducting-to-insulating transition (2014)

Yachin Ivry, Chung-Soo Kim, Andrew E. Dane, Domenico De Fazio, Adam N. McCaughan, Kristen A. Sunter, Qingyuan Zhao, and Karl K. Berggren

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Yachin Ivry, Chung-Soo Kim, Andrew E. Dane, Domenico De Fazio, Adam N. McCaughan, Kristen A. Sunter, Qingyuan Zhao, and Karl K. Berggren Thin superconducting films form a unique platform for geometrically confined, strongly interacting electrons. They allow an inherent competition between disorder and superconductivity, which in turn enables the intriguing superconducting-to-insulating transition and is believed to facilitate the com... [Phys. Rev. B 90, 214515] Published Mon Dec 15, 2014

Schlagwort(e): Superfluidity and superconductivity

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Frustration and multicriticality in the antiferromagnetic spin-1 chain (2014)

J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): J. H. Pixley, Aditya Shashi, and Andriy H. Nevidomskyy The antiferromagnetic spin-1 chain has a venerable history and has been thought to be well understood. Here, we show that inclusion of both next-nearest-neighbor (α) and biquadratic (β) interactions results in a rich phase diagram with a multicritical point that has not been observed before. We stud... [Phys. Rev. B 90, 214426] Published Mon Dec 15, 2014

Schlagwort(e): Magnetism

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Topological defects in systems with two competing order parameters: Application to superconductors with charge- and spin-density waves (2014)

Andreas Moor, Anatoly F. Volkov, and Konstantin B. Efetov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Andreas Moor, Anatoly F. Volkov, and Konstantin B. Efetov On the basis of coupled Ginzburg-Landau equations we study nonhomogeneous states in systems with two order parameters (OPs). Superconductors with a superconducting OP Δ and a charge- or spin-density wave with amplitude W are examples of such systems. When one OP, say Δ, has a form of a topological d... [Phys. Rev. B 90, 224512] Published Tue Dec 16, 2014

Schlagwort(e): Superfluidity and superconductivity

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Kinetic pathways to the magnetic charge crystal in artificial dipolar spin ice (2014)

I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): I. A. Chioar, B. Canals, D. Lacour, M. Hehn, B. Santos Burgos, T. O. Menteş, A. Locatelli, F. Montaigne, and N. Rougemaille The authors study a kagome artificial spin ice cooled from above its Curie temperature. They argue that the system after cooling, while appearing locally to be in the expected spin ice 2 phase, globally seems to be in some non-equilibrium state. [Phys. Rev. B 90, 220407] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Magnetic and electronic structure of the frustrated spin-chain compound linarite PbCuSO_{4}(OH)_{2} (2014)

M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): M. Schäpers, H. Rosner, S.-L. Drechsler, S. Süllow, R. Vogel, B. Büchner, and A. U. B. Wolter We present an extensive microscopic magnetic study of the quasi-one-dimensional frustrated s=1/2 spin-chain compound linarite. Angular-dependent susceptibility and 1 H-NMR measurements were performed at various temperatures in the paramagnetic state. All relevant NMR parameters, viz., the chemical, t... [Phys. Rev. B 90, 224417] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Spin-torque oscillators with thermal noise: A constant energy orbit approach (2014)

D. Pinna, D. L. Stein, and A. D. Kent

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): D. Pinna, D. L. Stein, and A. D. Kent We study the magnetization dynamics of spin-torque oscillators in the presence of thermal noise and as a function of the spin-polarization angle in a macrospin model. The macrospin has biaxial magnetic anisotropy, typical of thin film magnetic elements, with an easy axis in the film plane and a hard... [Phys. Rev. B 90, 174405] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Comment on “Superconductivity in electron-doped layered TiNCl with variable interlayer coupling” (2014)

Dale R. Harshman and Anthony T. Fiory

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Dale R. Harshman and Anthony T. Fiory In their article, Zhang et al. [Phys. Rev. B 86 , 024516 (2012)PRBMDO10.1103/PhysRevB.86.024516] present a remarkable result for Ax(S)yTiNCl compounds (α-phase TiNCl partially intercalated with alkali A and optionally co-intercalated molecular species S), finding the superconducting transition temper... [Phys. Rev. B 90, 186501] Published Thu Nov 06, 2014

Schlagwort(e): Superfluidity and superconductivity

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Reply to “Comment on ‘Superconductivity in electron-doped layered TiNCl with variable interlayer coupling' ” (2014)

S. Zhang, Masashi Tanaka, and Shoji Yamanaka

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): S. Zhang, Masashi Tanaka, and Shoji Yamanaka We have studied the electron-doped α-form TiNCl (FeOCl orthorhombic type) in detail and have found the transition temperature Tc of 18.0 K decreases monotonically with increasing the interlayer spacing d upon co-intercalation of various kinds of organic solvent molecules with alkali atoms. We conclu... [Phys. Rev. B 90, 186502] Published Thu Nov 06, 2014

Schlagwort(e): Superfluidity and superconductivity

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Heisenberg-like ferromagnetism in 3d-4f intermetallic La0.75Pr0.25Co2P2 with localized Co moments (2014)

P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): P. Lampen, M. H. Phan, H. Srikanth, K. Kovnir, P. Chai, and M. Shatruk The critical behavior near the continuous paramagnetic to ferromagnetic transition in a single crystal of La0.75Pr0.25Co2P2 has been determined based on high-resolution bulk magnetization data near TC ∼ 167 K, where long-range order is established in the Co sublattice. Scaling equation of state anal... [Phys. Rev. B 90, 174404] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Quasiparticle breakdown in the quasi-one-dimensional Ising ferromagnet CoNb2O6 (2014)

Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Neil J. Robinson, Fabian H. L. Essler, Ivelisse Cabrera, and Radu Coldea We present experimental and theoretical evidence that an interesting quantum many-body effect—quasiparticle breakdown—occurs in the quasi-one-dimensional spin-12 Ising-like ferromagnet CoNb2O6 in its paramagnetic phase at high transverse field as a result of explicit breaking of spin inversion symme... [Phys. Rev. B 90, 174406] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Multipole order and global/site symmetry in the hidden-order phase of URu2Si2 (2014)

Michi-To Suzuki and Hiroaki Ikeda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Michi-To Suzuki and Hiroaki Ikeda On the basis of group theory and first-principles calculations, we investigate high-rank multipole orderings in URu2Si2, which have been proposed as a genuine primary order parameter in the hidden-order phase below 17.5 K. We apply Shubnikov group theory to the multipole ordered states characterized... [Phys. Rev. B 90, 184407] Published Thu Nov 06, 2014

Schlagwort(e): Magnetism

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Stabilization and Manipulation of Electronically Phase-Separated Ground States in Defective Indium Atom Wires on Silicon (2014)

Hui Zhang, Fangfei Ming, Hyun-Jung Kim, Hongbin Zhu, Qiang Zhang, Hanno H. Weitering, Xudong Xiao, Changgan Zeng, Jun-Hyung Cho, and Zhenyu Zhang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Hui Zhang, Fangfei Ming, Hyun-Jung Kim, Hongbin Zhu, Qiang Zhang, Hanno H. Weitering, Xudong Xiao, Changgan Zeng, Jun-Hyung Cho, and Zhenyu Zhang Exploration and manipulation of electronic states in low-dimensional systems are of great importance in the fundamental and practical aspects of nanomaterial and nanotechnology. Here, we demonstrate that the incorporation of vacancy defects into monatomic indium wires on n-type Si(111) can stabilize... [Phys. Rev. Lett. 113, 196802] Published Thu Nov 06, 2014

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

Print ISSN: 0031-9007

Digitale ISSN: 1079-7114

Thema: Physik

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Noncoplanar and Counterrotating Incommensurate Magnetic Order Stabilized by Kitaev Interactions in γ-Li2IrO3 (2014)

A. Biffin, R. D. Johnson, I. Kimchi, R. Morris, A. Bombardi, J. G. Analytis, A. Vishwanath, and R. Coldea

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): A. Biffin, R. D. Johnson, I. Kimchi, R. Morris, A. Bombardi, J. G. Analytis, A. Vishwanath, and R. Coldea Materials that realize Kitaev spin models with bond-dependent anisotropic interactions have long been searched for, as the resulting frustration effects are predicted to stabilize novel forms of magnetic order or quantum spin liquids. Here, we explore the magnetism of γ-Li2IrO3, which has the topolo... [Phys. Rev. Lett. 113, 197201] Published Thu Nov 06, 2014

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

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Revealing Topological Superconductivity in Extended Quantum Spin Hall Josephson Junctions (2014)

Shu-Ping Lee, Karen Michaeli, Jason Alicea, and Amir Yacoby

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): Shu-Ping Lee, Karen Michaeli, Jason Alicea, and Amir Yacoby Quantum spin Hall–superconductor hybrids are promising sources of topological superconductivity and Majorana modes, particularly given recent progress on HgTe and InAs/GaSb. We propose a new method of revealing topological superconductivity in extended quantum spin Hall Josephson junctions supportin... [Phys. Rev. Lett. 113, 197001] Published Thu Nov 06, 2014

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

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What Determines the Fermi Wave Vector of Composite Fermions? (2014)

D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-07

Beschreibung: Author(s): D. Kamburov, Yang Liu, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, and K. W. Baldwin Composite fermions (CFs), exotic particles formed by pairing an even number of flux quanta to each electron, provide a fascinating description of phenomena exhibited by interacting two-dimensional electrons at high magnetic fields. At and near Landau level filling ν=1/2, CFs occupy a Fermi sea and e... [Phys. Rev. Lett. 113, 196801] Published Thu Nov 06, 2014

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

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Freezing a quantum magnet by repeated quantum interference: An experimental realization (2014)

Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Swathi S. Hegde, Hemant Katiyar, T. S. Mahesh, and Arnab Das We experimentally demonstrate the phenomenon of dynamical many-body freezing in a periodically driven Ising chain. Theoretically [A. Das, Phys. Rev. B 82 , 172402 (2010)PRBMDO10.1103/PhysRevB.82.172402], for certain values of the drive parameters all fundamental degrees of freedom contributing to the... [Phys. Rev. B 90, 174407] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Pulling extremely anisotropic lossy particles using light without intensity gradient (2014)

Andrey Novitsky and Cheng-Wei Qiu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Andrey Novitsky and Cheng-Wei Qiu We study the effect of pulling optical force acting on a nonmagnetic anisotropic bead in electromagnetic fields without intensity gradient. Extreme anisotropy can be realized by a hyperbolic metamaterial made of metal-dielectric multilayers. We find that a passive anisotropic Rayleigh particle canno... [Phys. Rev. A 90, 053815] Published Fri Nov 07, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

Print ISSN: 1050-2947

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Majorana vortex-bound states in three-dimensional nodal noncentrosymmetric superconductors (2014)

Po-Yao Chang, Shunji Matsuura, Andreas P. Schnyder, and Shinsei Ryu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Po-Yao Chang, Shunji Matsuura, Andreas P. Schnyder, and Shinsei Ryu Noncentrosymmetric superconductors (NCSs), characterized by antisymmetric spin-orbit coupling and a mixture of spin-singlet and spin-triplet pairing components, are promising candidate materials for topological superconductivity. An important hallmark of topological superconductors is the existence ... [Phys. Rev. B 90, 174504] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Fermi-surface reconstruction and transport coefficients from a mean-field bidirectional charge-density wave state in the high-Tc cuprates (2014)

Kangjun Seo and Sumanta Tewari

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Kangjun Seo and Sumanta Tewari The recent discovery of an incipient charge-density wave (CDW) instability competing with superconductivity in a class of high-temperature cuprate superconductors has brought the role of charge order in the phase diagram of the cuprates under renewed focus. Here, we take a mean field Q1=(2π/3,0) and... [Phys. Rev. B 90, 174503] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Observation of pseudogaplike feature above Tc in LiFeAs by ultrafast optical spectroscopy (2014)

Kung-Hsuan Lin (林宮玄), Kuan-Jen Wang (王冠仁), Chung-Chieh Chang (張忠傑), Yu-Chieh Wen (溫昱傑), Dzung-Han Tsai (蔡宗翰), Yu-Ruei Wu (吳育叡), Yao-Tsung Hsieh (謝曜聰), Ming-Jye Wang (王明杰), Bing Lv (吕兵), Paul Ching-Wu Chu (朱經武), and Maw-Kuen Wu (吳茂昆)

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Kung-Hsuan Lin (林宮玄), Kuan-Jen Wang (王冠仁), Chung-Chieh Chang (張忠傑), Yu-Chieh Wen (溫昱傑), Dzung-Han Tsai (蔡宗翰), Yu-Ruei Wu (吳育叡), Yao-Tsung Hsieh (謝曜聰), Ming-Jye Wang (王明杰), Bing Lv (吕兵), Paul Ching-Wu Chu (朱經武), and Maw-Kuen Wu (吳茂昆) We utilize ultrafast optical spectroscopy to study the quasiparticle relaxation in stoichiometric LiFeAs crystals. According to our temperature-dependent studies, we have observed three electronic phases in LiFeAs. Below the superconducting (SC) temperature Tc (=15 K), the relaxation time of quasipa... [Phys. Rev. B 90, 174502] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Josephson junctions with tunable current-phase relation (2014)

A. Lipman, R. G. Mints, R. Kleiner, D. Koelle, and E. Goldobin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): A. Lipman, R. G. Mints, R. Kleiner, D. Koelle, and E. Goldobin We consider 0-π Josephson junctions consisting of 0 and π regions of lengths L0 and Lπ with critical current densities jc0 and jcπ, respectively. The dependence of the Josephson current on the phase-shift averaged along the junction is derived. We show that these systems exhibit the main features of... [Phys. Rev. B 90, 184502] Published Fri Nov 07, 2014

Schlagwort(e): Superfluidity and superconductivity

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Generation of harmonics via multiphoton resonant excitation of hydrogenlike ions in an x-ray free-electron-laser field (2014)

H. K. Avetissian, B. R. Avchyan, and G. F. Mkrtchian

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): H. K. Avetissian, B. R. Avchyan, and G. F. Mkrtchian The coherent radiation spectrum of highly charged hydrogenlike ions in an intense x-ray free-electron-laser field is considered. The spectrum corresponding to harmonic generation in the resonant multiphoton excitation regime is investigated both analytically and numerically, arising from the Dirac H... [Phys. Rev. A 90, 053812] Published Fri Nov 07, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Magnetic order and spin dynamics in La2O2Fe2OSe2 probed by Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy (2014)

M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): M. Günther, S. Kamusella, R. Sarkar, T. Goltz, H. Luetkens, G. Pascua, S.-H. Do, K.-Y. Choi, H. D. Zhou, C. G. F. Blum, S. Wurmehl, B. Büchner, and H.-H. Klauss We present a detailed local probe study of the magnetic order in the oxychalcogenide La2O2Fe2OSe2 utilizing Fe57 Mössbauer, La139 NMR, and muon-spin relaxation spectroscopy. This system can be regarded as an insulating reference system of the Fe arsenide and chalcogenide superconductors. From the co... [Phys. Rev. B 90, 184408] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Perpendicular magnetic anisotropy in CoFe/MgO/CoFe magnetic tunnel junctions by first-principles calculations (2014)

Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Jia Zhang, Christian Franz, Michael Czerner, and Christian Heiliger The magnetic anisotropy in FexCo100−x/MgO/FexCo100−x magnetic tunnel junctions as a function of composition is investigated on different substrates (Cu, Ag, and MgO). We use the full relativistic screened-Korringa-Kohn-Rostoker method and employ the coherent potential approximation for description o... [Phys. Rev. B 90, 184409] Published Fri Nov 07, 2014

Schlagwort(e): Magnetism

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Manipulation and Characterization of Aperiodical Graphene Structures Created in a Two-Dimensional Electron Gas (2014)

Shiyong Wang, Liang Z. Tan, Weihua Wang, Steven G. Louie, and Nian Lin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Shiyong Wang, Liang Z. Tan, Weihua Wang, Steven G. Louie, and Nian Lin We demonstrate that Dirac fermions can be created and manipulated in a two-dimensional electron gas (2DEG). Using a cryogenic scanning tunneling microscope, we arranged coronene molecules one by one on a Cu(111) surface to construct artificial graphene nanoribbons with perfect zigzag (ZGNRs) or arm-... [Phys. Rev. Lett. 113, 196803] Published Fri Nov 07, 2014

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

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Vaporization of Kitaev Spin Liquids (2014)

Joji Nasu, Masafumi Udagawa, and Yukitoshi Motome

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Joji Nasu, Masafumi Udagawa, and Yukitoshi Motome The quantum spin liquid is an exotic quantum state of matter in magnets. This state is a spin analog of liquid helium that does not solidify down to the lowest temperature due to strong quantum fluctuations. In conventional fluids, the liquid and gas possess the same symmetry and adiabatically conne... [Phys. Rev. Lett. 113, 197205] Published Fri Nov 07, 2014

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

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Fractionalized Charge Excitations in a Spin Liquid on Partially Filled Pyrochlore Lattices (2014)

Gang Chen, Hae-Young Kee, and Yong Baek Kim

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Gang Chen, Hae-Young Kee, and Yong Baek Kim We study the Mott transition from a metal to cluster Mott insulators in the 1/4- and Please note that APS made slight change to the title of the paper1/8-filled pyrochlore lattice systems. It is shown that such Mott transitions can arise due to charge localization in clusters or in tetrahedron units... [Phys. Rev. Lett. 113, 197202] Published Fri Nov 07, 2014

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

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Sufficient Condition for Entanglement Area Laws in Thermodynamically Gapped Spin Systems (2014)

Jaeyoon Cho

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): Jaeyoon Cho We consider general locally interacting arbitrary-dimensional lattice spin systems that are gapped for any system size. We show under reasonable conditions that nondegenerate ground states of such systems obey the entanglement area law. In so doing, we offer an intuitive picture on how a spectral ga... [Phys. Rev. Lett. 113, 197204] Published Fri Nov 07, 2014

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

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Full Control of the Spin-Wave Damping in a Magnetic Insulator Using Spin-Orbit Torque (2014)

A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-08

Beschreibung: Author(s): A. Hamadeh, O. d’Allivy Kelly, C. Hahn, H. Meley, R. Bernard, A. H. Molpeceres, V. V. Naletov, M. Viret, A. Anane, V. Cros, S. O. Demokritov, J. L. Prieto, M. Muñoz, G. de Loubens, and O. Klein It is demonstrated that the threshold current for damping compensation can be reached in a 5 μm diameter YIG(20 nm)|Pt(7 nm) disk. The demonstration rests upon the measurement of the ferromagnetic resonance linewidth as a function of Idc using a magnetic resonance force microscope (MRFM). It is s... [Phys. Rev. Lett. 113, 197203] Published Fri Nov 07, 2014

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

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Magnetic Resonance Detection of Individual Proton Spins Using Quantum Reporters (2014)

A. O. Sushkov, I. Lovchinsky, N. Chisholm, R. L. Walsworth, H. Park, and M. D. Lukin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): A. O. Sushkov, I. Lovchinsky, N. Chisholm, R. L. Walsworth, H. Park, and M. D. Lukin An NMR scheme based on nitrogen vacancies in diamond images the spins of individual protons. [Phys. Rev. Lett. 113, 197601] Published Mon Nov 03, 2014

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

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Magnetization plateaus and jumps in a frustrated four-leg spin tube under a magnetic field (2014)

F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-05

Beschreibung: Author(s): F. A. Gómez Albarracín, M. Arlego, and H. D. Rosales We study the ground state phase diagram of a frustrated spin-1/2 four-leg spin tube in an external magnetic field. We explore the parameter space of this model in the regime of all-antiferromagnetic exchange couplings by means of three different approaches: analysis of low-energy effective Hamiltoni... [Phys. Rev. B 90, 174403] Published Tue Nov 04, 2014

Schlagwort(e): Magnetism

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Scattering resonances and bound states for strongly interacting Rydberg polaritons (2014)

P. Bienias, S. Choi, O. Firstenberg, M. F. Maghrebi, M. Gullans, M. D. Lukin, A. V. Gorshkov, and H. P. Büchler

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): P. Bienias, S. Choi, O. Firstenberg, M. F. Maghrebi, M. Gullans, M. D. Lukin, A. V. Gorshkov, and H. P. Büchler We provide a theoretical framework describing slow-light polaritons interacting via atomic Rydberg states. The method allows us to analytically derive the scattering properties of two polaritons. We identify parameter regimes where polariton-polariton interactions are repulsive. Furthermore, in the ... [Phys. Rev. A 90, 053804] Published Mon Nov 03, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Conductance anomalies of CoFeB/MgO/CoFeB magnetic tunnel junctions (2014)

S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): S. Ringer, M. Vieth, L. Bär, M. Rührig, and G. Bayreuther The I-V characteristics of CoFeB/MgO/CoFeB magnetic tunnel junctions show pronounced nonlinearities which are relevant both for sensor applications and for the basic understanding of spin-dependent tunneling. To study the relation between the tunnel characteristics and the tunnel magnetoresistance (... [Phys. Rev. B 90, 174401] Published Mon Nov 03, 2014

Schlagwort(e): Magnetism

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Spin-Electricity Conversion Induced by Spin Injection into Topological Insulators (2014)

Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, Kouji Segawa, Yoichi Ando, and E. Saitoh

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Y. Shiomi, K. Nomura, Y. Kajiwara, K. Eto, M. Novak, Kouji Segawa, Yoichi Ando, and E. Saitoh We report successful spin injection into the surface states of topological insulators by using a spin pumping technique. By measuring the voltage that shows up across the samples as a result of spin pumping, we demonstrate that a spin-electricity conversion effect takes place in the surface states o... [Phys. Rev. Lett. 113, 196601] Published Mon Nov 03, 2014

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Bloch bound states in the radiation continuum in a periodic array of dielectric rods (2014)

Evgeny N. Bulgakov and Almas F. Sadreev

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Evgeny N. Bulgakov and Almas F. Sadreev We consider an infinite periodic array of dielectric rods in vacuum with the aim to demonstrate three types of Bloch bound states in the continuum (BSCs): symmetry protected with a zero Bloch vector, embedded in one diffraction channel with nonzero Bloch vector, and embedded in two and three diffrac... [Phys. Rev. A 90, 053801] Published Mon Nov 03, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Single-photon modulation by the collective emission of an atomic chain (2014)

Zeyang Liao and M. Suhail Zubairy

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Zeyang Liao and M. Suhail Zubairy We study the collective spontaneous emission of a linear atomic chain excited by a single photon. The interaction between the atoms and the common vacuum field can significantly change the eigenenergy and the spontaneous emission rate of the system. Due to the dipole-dipole interactions, the system ... [Phys. Rev. A 90, 053805] Published Mon Nov 03, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Enhanced self-diffusion of adsorbed methanol in silica aerogel (2014)

Jeongseop A. Lee, A. M. Mounce, Sangwon Oh, A. M. Zimmerman, and W. P. Halperin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-04

Beschreibung: Author(s): Jeongseop A. Lee, A. M. Mounce, Sangwon Oh, A. M. Zimmerman, and W. P. Halperin Nuclear magnetic resonance techniques are used to study anomalously high diffusion of methanol in porous silica aerogel. [Phys. Rev. B 90, 174501] Published Mon Nov 03, 2014

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Optomechanical Ramsey interferometry (2014)

Kenan Qu, Chunhua Dong, Hailin Wang, and G. S. Agarwal

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Kenan Qu, Chunhua Dong, Hailin Wang, and G. S. Agarwal We adopt Ramsey's method of separated oscillatory fields to study coherences of the mechanical system in an optomechanical resonator. The high-resolution Ramsey fringes are observed in the emission optical field, when two pulses separated in time are applied. We develop a theory to describe the tran... [Phys. Rev. A 90, 053809] Published Wed Nov 05, 2014

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Exchange splitting of surface and bulk electronic states in excited magnetic states of Gd: First-principles study (2014)

L. M. Sandratskii

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): L. M. Sandratskii Recent pump-probe experiments provide time evolution of the bulk and surface electronic states in Gd excited by the laser pulse. These experiments are in close connection with earlier spectroscopic experiments probing temperature dependence of the exchange splitting of the electronic states. We repo... [Phys. Rev. B 90, 184406] Published Wed Nov 05, 2014

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Asymmetric Frequency Conversion in Nonlinear Systems Driven by a Biharmonic Pump (2014)

Archana Kamal, Ananda Roy, John Clarke, and Michel H. Devoret

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-12

Beschreibung: Author(s): Archana Kamal, Ananda Roy, John Clarke, and Michel H. Devoret A novel mechanism of asymmetric frequency conversion is investigated in nonlinear dispersive devices driven parametrically with a biharmonic pump. When the relative phase between the first and second harmonics combined in a two-tone pump is appropriately tuned, nonreciprocal frequency conversion, ei... [Phys. Rev. Lett. 113, 247003] Published Thu Dec 11, 2014

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Cooperative effects and disorder: A scaling analysis of the spectrum of the effective atomic Hamiltonian (2014)

L. Bellando, A. Gero, E. Akkermans, and R. Kaiser

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): L. Bellando, A. Gero, E. Akkermans, and R. Kaiser We study numerically the spectrum of the non-Hermitian effective Hamiltonian that describes the dipolar interaction of a gas of N≫1 atoms with the radiation field. We analyze the interplay between cooperative effects and disorder for both scalar and vectorial radiation fields. We show that for dense... [Phys. Rev. A 90, 063822] Published Mon Dec 15, 2014

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Prediction of Near-Room-Temperature Quantum Anomalous Hall Effect on Honeycomb Materials (2014)

Shu-Chun Wu, Guangcun Shan, and Binghai Yan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-16

Beschreibung: Author(s): Shu-Chun Wu, Guangcun Shan, and Binghai Yan Recently, the long-sough quantum anomalous Hall effect was realized in a magnetic topological insulator. However, the requirement of an extremely low temperature (approximately 30 mK) hinders realistic applications. Based on ab initio band structure calculations, we propose a quantum anomalous Hall ... [Phys. Rev. Lett. 113, 256401] Published Mon Dec 15, 2014

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

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Quantum filtering of a thermal master equation with a purified reservoir (2014)

Marco G. Genoni, Stefano Mancini, Howard M. Wiseman, and Alessio Serafini

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Marco G. Genoni, Stefano Mancini, Howard M. Wiseman, and Alessio Serafini We consider a system subject to a quantum optical master equation at finite temperature and study a class of conditional dynamics obtained by monitoring its totally or partially purified environment. More specifically, drawing from the notion that the thermal state of the environment may be regarded... [Phys. Rev. A 90, 063826] Published Tue Dec 16, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Stability of polarizable materials against superradiant phase transition (2014)

Motoaki Bamba and Tetsuo Ogawa

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-17

Beschreibung: Author(s): Motoaki Bamba and Tetsuo Ogawa The possibility of the superradiant phase transition in polarizable materials described by the minimal-coupling Hamiltonian with the longitudinal dipole-dipole interaction is examined. We try to reduce the Hamiltonian into the Dicke one in the homogeneous and infinite case, and discuss the stability... [Phys. Rev. A 90, 063825] Published Tue Dec 16, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Transport measurements of the spin-wave parameters of thin Mn films (2014)

S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): S. Buvaev, S. Ghosh, K. Muttalib, P. Wölfle, and A. Hebard This paper provides an experimental description and theoretical explanation of how disorder affects electronic transport in antiferromagnetic thin films. The authors find a quantum correction to the conductivity which survives to high disorder strength because of a high rate of inelastic scattering of electrons off of gapped antiferromagnetic spin waves. The data provide first-time estimates of the spin-wave energy gap and exchange energy derived solely from transport measurements. The focus on the unexplored effect of antiferromagnetism on electronic transport provides new perspectives on the role of electronic transport and spin alignment in disordered magnetic systems. [Phys. Rev. B 90, 214429] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Filtering of matter symmetry properties by circularly polarized nonlinear optics (2014)

Julien Duboisset, Hervé Rigneault, and Sophie Brasselet

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Julien Duboisset, Hervé Rigneault, and Sophie Brasselet We propose a direct readout of symmetry information in matter using nonlinear optics. From combinations of circularly and longitudinally polarized optical fields, we construct irreducible spherical field tensors for second- and third-order nonlinear processes. The coupling of these field tensors to ... [Phys. Rev. A 90, 063827] Published Wed Dec 17, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Experimental and numerical understanding of localized spin wave mode behavior in broadly tunable spatially complex magnetic configurations (2014)

Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Chunhui Du, Rohan Adur, Hailong Wang, Sergei A. Manuilov, Fengyuan Yang, Denis V. Pelekhov, and P. Chris Hammel Spin wave modes confined in a ferromagnetic film by the spatially inhomogeneous magnetic field generated by a scanned micromagnetic tip of a ferromagnetic resonance force microscope (FMRFM) enable microscopic imaging of the internal fields and spin dynamics in nanoscale magnetic devices. Here we rep... [Phys. Rev. B 90, 214428] Published Wed Dec 17, 2014

Schlagwort(e): Magnetism

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Pressure-enhanced superconductivity in Eu_{3}Bi_{2}S_{4}F_{4} (2014)

Yongkang Luo, Hui-Fei Zhai, Pan Zhang, Zhu-An Xu, Guang-Han Cao, and J. D. Thompson

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-18

Beschreibung: Author(s): Yongkang Luo, Hui-Fei Zhai, Pan Zhang, Zhu-An Xu, Guang-Han Cao, and J. D. Thompson The pressure effect on the newly discovered charge-transferred BiS 2 -based superconductor, Eu 3 Bi 2 S 4 F 4 , with a T c of 1.5 K at ambient pressure, is investigated by transport and magnetic measurements. Accompanied with the enhancement of metallicity under pressures, the onset superconducting transition ... [Phys. Rev. B 90, 220510] Published Wed Dec 17, 2014

Schlagwort(e): Superfluidity and superconductivity

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Superradiance and collective gain in multimode optomechanics (2014)

T. Kipf and G. S. Agarwal

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): T. Kipf and G. S. Agarwal We present a description of a strongly driven multimode optomechanical system that shows the emergence of cooperative effects usually known from systems of atom-light interaction. Our calculations show that under application of a coherent pump field the system's response can be switched from a super... [Phys. Rev. A 90, 053808] Published Wed Nov 05, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Terahertz emission spectroscopy of laser-induced spin dynamics in TmFeO3 and ErFeO3 orthoferrites (2014)

R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): R. V. Mikhaylovskiy, E. Hendry, V. V. Kruglyak, R. V. Pisarev, Th. Rasing, and A. V. Kimel Using the examples of laser-induced spin-reorientation phase transitions in TmFeO3 and ErFeO3 orthoferrites, we demonstrate that terahertz emission spectroscopy can obtain novel information about ultrafast laser-induced spin dynamics, which is not accessible by more common all-optical methods. The p... [Phys. Rev. B 90, 184405] Published Wed Nov 05, 2014

Schlagwort(e): Magnetism

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Quantum manifestation of a synchronization transition in optomechanical systems (2014)

Lei Ying, Ying-Cheng Lai, and Celso Grebogi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-11-06

Beschreibung: Author(s): Lei Ying, Ying-Cheng Lai, and Celso Grebogi Recent years have witnessed significant interest in nanoscale physical systems, such as nanoelectromechanical and optomechanical systems, which can exhibit distinct collective dynamical behaviors, such as synchronization. As a parameter of the system changes, transition from one type of emerging col... [Phys. Rev. A 90, 053810] Published Wed Nov 05, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Three-dimensional atom localization by laser fields in a four-level tripod system (2014)

Vladimir S. Ivanov, Yuri V. Rozhdestvensky, and Kalle-Antti Suominen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Vladimir S. Ivanov, Yuri V. Rozhdestvensky, and Kalle-Antti Suominen We present a scheme for high-precision three-dimensional (3D) localization by the measurement of the atomic-level population. The scheme is applied to a four-level tripod-type atom coupled by three strong standing waves and a probe running wave. As a result, the atom can be localized in volumes that... [Phys. Rev. A 90, 063802] Published Mon Dec 01, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Unified position-dependent photon-number quantization in layered structures (2014)

Mikko Partanen, Teppo Häyrynen, Jani Oksanen, and Jukka Tulkki

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Mikko Partanen, Teppo Häyrynen, Jani Oksanen, and Jukka Tulkki We have recently developed a position-dependent quantization scheme for describing the ladder and effective photon-number operators associated with the electric field to analyze quantum optical energy transfer in lossy and dispersive dielectrics [Phys. Rev. A 89 , 033831 (2014)PLRAAN10.1103/PhysRevA.... [Phys. Rev. A 90, 063804] Published Mon Dec 01, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Nonlocal transport mediated by spin supercurrents (2014)

Hua Chen, Andrew D. Kent, Allan H. Mac; Donald, and Inti Sodemann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-02

Beschreibung: Author(s): Hua Chen, Andrew D. Kent, Allan H. MacDonald, and Inti Sodemann In thin-film ferromagnets with perfect easy-plane anisotropy, the component of total spin perpendicular to the easy plane is a good quantum number and the corresponding spin supercurrent can flow without dissipation. Here we explain how spin supercurrents couple spatially remote spin-mixing vertical... [Phys. Rev. B 90, 220401] Published Mon Dec 01, 2014

Schlagwort(e): Magnetism

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Fast, all-optical logic gates and transistor functionalities using a room-temperature atomic controlled Kerr gate (2014)

R. B. Li, L. Deng, and E. W. Hagley

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): R. B. Li, L. Deng, and E. W. Hagley We demonstrate all-optical multilogic gate operations and transistor functionalities using a Kerr phase gate method in a room-temperature 85 Rb vapor. Two symmetric Mach-Zehnder interferometers are constructed in the same vapor cell in which a Raman gain medium is established. We show three basic log... [Phys. Rev. A 90, 063806] Published Tue Dec 02, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Circular-Polarization-Sensitive Metamaterial Based on Triple-Quantum-Dot Molecules (2014)

Panagiotis Kotetes, Pei-Qing Jin, Michael Marthaler, and Gerd Schön

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-03

Beschreibung: Author(s): Panagiotis Kotetes, Pei-Qing Jin, Michael Marthaler, and Gerd Schön We propose a new type of chiral metamaterial based on an ensemble of artificial molecules formed by three identical quantum dots in a triangular arrangement. A static magnetic field oriented perpendicular to the plane breaks mirror symmetry, rendering the molecules sensitive to the circular polariza... [Phys. Rev. Lett. 113, 236801] Published Tue Dec 02, 2014

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

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Effective Theory of Floquet Topological Transitions (2014)

Arijit Kundu, H. A. Fertig, and Babak Seradjeh

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Arijit Kundu, H. A. Fertig, and Babak Seradjeh We develop a theory of topological transitions in a Floquet topological insulator, using graphene irradiated by circularly polarized light as a concrete realization. We demonstrate that a hallmark signature of such transitions in a static system, i.e., metallic bulk transport with conductivity of or... [Phys. Rev. Lett. 113, 236803] Published Wed Dec 03, 2014

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Noncollinear Paramagnetism of a GaAs Two-Dimensional Hole System (2014)

L. A. Yeoh, A. Srinivasan, O. Klochan, R. Winkler, U. Zülicke, M. Y. Simmons, D. A. Ritchie, M. Pepper, and A. R. Hamilton

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): L. A. Yeoh, A. Srinivasan, O. Klochan, R. Winkler, U. Zülicke, M. Y. Simmons, D. A. Ritchie, M. Pepper, and A. R. Hamilton We have performed transport measurements in tilted magnetic fields in a two-dimensional hole system grown on the surface of a (311)A GaAs crystal. A striking asymmetry of Shubnikov–de Haas oscillations occurs upon reversing the in-plane component of the magnetic field along the low-symmetry [2̅ ... [Phys. Rev. Lett. 113, 236401] Published Wed Dec 03, 2014

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Fibonacci Anyons From Abelian Bilayer Quantum Hall States (2014)

Abolhassan Vaezi and Maissam Barkeshli

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Abolhassan Vaezi and Maissam Barkeshli The possibility of realizing non-Abelian statistics and utilizing it for topological quantum computation (TQC) has generated widespread interest. However, the non-Abelian statistics that can be realized in most accessible proposals is not powerful enough for universal TQC. In this Letter, we conside... [Phys. Rev. Lett. 113, 236804] Published Wed Dec 03, 2014

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Magnetism of Ho and Er Atoms on Close-Packed Metal Surfaces (2014)

F. Donati, A. Singha, S. Stepanow, C. Wäckerlin, J. Dreiser, P. Gambardella, S. Rusponi, and H. Brune

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): F. Donati, A. Singha, S. Stepanow, C. Wäckerlin, J. Dreiser, P. Gambardella, S. Rusponi, and H. Brune We investigated the magnetic properties of individual Ho atoms adsorbed on the (111) surface of Pt, which have been recently claimed to display single ion magnetic behavior. By combining x-ray absorption spectroscopy and magnetic dichroism measurements with ligand field multiplet calculations, we re... [Phys. Rev. Lett. 113, 237201] Published Wed Dec 03, 2014

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Quantum Spin Dimers from Chiral Dissipation in Cold-Atom Chains (2014)

Tomás Ramos, Hannes Pichler, Andrew J. Daley, and Peter Zoller

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Tomás Ramos, Hannes Pichler, Andrew J. Daley, and Peter Zoller We consider the nonequilibrium dynamics of a driven dissipative spin chain with chiral coupling to a one-dimensional (1D) bosonic bath, and its atomic implementation with a two-species mixture of cold quantum gases. The reservoir is represented by a spin-orbit coupled 1D quasicondensate of atoms in ... [Phys. Rev. Lett. 113, 237203] Published Wed Dec 03, 2014

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Magnetic Damping: Domain Wall Dynamics versus Local Ferromagnetic Resonance (2014)

T. Weindler, H. G. Bauer, R. Islinger, B. Boehm, J.-Y. Chauleau, and C. H. Back

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): T. Weindler, H. G. Bauer, R. Islinger, B. Boehm, J.-Y. Chauleau, and C. H. Back Magnetic relaxation is one of the dominating features of magnetization dynamics. Depending on the magnetic structure and the experimental approach, different magnitudes of the damping parameter are reported even for a given material. In this study, we experimentally address this issue by accessing t... [Phys. Rev. Lett. 113, 237204] Published Wed Dec 03, 2014

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Protecting a Solid-State Spin from Decoherence Using Dressed Spin States (2014)

D. Andrew Golter, Thomas K. Baldwin, and Hailin Wang

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): D. Andrew Golter, Thomas K. Baldwin, and Hailin Wang We report experimental studies of dressing an electron spin in diamond with resonant and continuous microwave fields to protect the electron spin from magnetic fluctuations induced by the nuclear spin bath. We use optical coherent population trapping (CPT) to probe the energy level structure, optica... [Phys. Rev. Lett. 113, 237601] Published Wed Dec 03, 2014

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Are Hydrogen-Bonded Charge Transfer Crystals Room Temperature Ferroelectrics? (2014)

Gabriele D’Avino and Matthieu J. Verstraete

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-12-04

Beschreibung: Author(s): Gabriele D’Avino and Matthieu J. Verstraete We present a theoretical investigation of the anomalous ferroelectricity of mixed-stack charge transfer molecular crystals, based on the Peierls-Hubbard model, and first-principles calculations for its parametrization. This approach is first validated by reproducing the temperature-induced transitio... [Phys. Rev. Lett. 113, 237602] Published Wed Dec 03, 2014

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Quantum Selection of Order in an XXZ Antiferromagnet on a Kagome Lattice (2014)

A. L. Chernyshev and M. E. Zhitomirsky

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): A. L. Chernyshev and M. E. Zhitomirsky Selection of the ground state of the kagome-lattice XXZ antiferromagnet by quantum fluctuations is investigated by combining nonlinear spin-wave and real-space perturbation theories. The two methods unanimously favor q =0 over √ 3 ×√ 3 magnetic order in a wide range of the anisotropy parameter 0≤Δ≲0.72.... [Phys. Rev. Lett. 113, 237202] Published Wed Dec 03, 2014

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Internal static electric and magnetic field at the copper cite in a single crystal of the electron-doped high-T_{c} superconductor Pr_{1.85}Ce_{0.15}CuO_{4−y} (2014)

Guoqing Wu, F. Zamborszky, A. P. Reyes, P. L. Kuhns, R. L. Greene, and W. G. Clark

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): Guoqing Wu, F. Zamborszky, A. P. Reyes, P. L. Kuhns, R. L. Greene, and W. G. Clark We report 63,65 Cu-NMR spectroscopy and Knight shift measurements on a single crystal of the electron-doped high-T c superconductor Pr 1.85 Ce 0.15 CuO 4−y with an applied magnetic field (H) up to 26.42 T. A very small NQR frequency is obtained with the observation of the spectrum, which shows an extremely... [Phys. Rev. B 90, 214506] Published Thu Dec 04, 2014

Schlagwort(e): Superfluidity and superconductivity

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Anomalous spin dynamics in CdCu_{2}(BO_{3})_{2} revealed by ^{11}B NMR and ZF-μSR (2014)

W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): W.-J. Lee, S.-H. Do, Sungwon Yoon, Z. H. Jang, B. J. Suh, J. H. Lee, A. P. Reyes, P. L. Kuhns, H. Luetkens, and K.-Y. Choi We report 11 B nuclear magnetic resonance (NMR) and zero-field muon spin relaxation (ZF-μSR) measurements of the anisotropic spin tetramer system CdCu 2 (BO 3 ) 2 , which consists of strongly interacting Cu(1) dimers and weakly coupled nonfrustrated Cu(2) spins. Long-range magnetic order is observed at T ... [Phys. Rev. B 90, 214416] Published Thu Dec 04, 2014

Schlagwort(e): Magnetism

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Itinerant effects and enhanced magnetic interactions in Bi-based multilayer cuprates (2014)

M. P. M. Dean, A. J. A. James, A. C. Walters, V. Bisogni, I. Jarrige, M. Hücker, E. Giannini, M. Fujita, J. Pelliciari, Y. B. Huang, R. M. Konik, T. Schmitt, and J. P. Hill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-12-05

Beschreibung: Author(s): M. P. M. Dean, A. J. A. James, A. C. Walters, V. Bisogni, I. Jarrige, M. Hücker, E. Giannini, M. Fujita, J. Pelliciari, Y. B. Huang, R. M. Konik, T. Schmitt, and J. P. Hill The cuprate high temperature superconductors exhibit a pronounced trend in which the superconducting transition temperature T c increases with the number of CuO 2 planes n in the crystal structure. We compare the magnetic excitation spectrum of Bi 2+x Sr 2−x CuO 6+δ (Bi-2201) and Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ (Bi-2223... [Phys. Rev. B 90, 220506] Published Thu Dec 04, 2014

Schlagwort(e): Superfluidity and superconductivity

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Spin-Orbit Fluctuations in Frustrated Heavy-Fermion Metal LiV_{2}O_{4} (2014)

K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): K. Tomiyasu, K. Iwasa, H. Ueda, S. Niitaka, H. Takagi, S. Ohira-Kawamura, T. Kikuchi, Y. Inamura, K. Nakajima, and K. Yamada Spin fluctuations were studied over a wide momentum (ℏQ) and energy (E) space in the frustrated d-electron heavy-fermion metal LiV 2 O 4 by time-of-flight inelastic neutron scattering. We observed the overall Q−E evolutions near the characteristic Q=0.6 Å -1 peak and found another weak broad magnetic ... [Phys. Rev. Lett. 113, 236402] Published Thu Dec 04, 2014

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

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Electrical Spin Injection into High Mobility 2D Systems (2014)

M. Oltscher, M. Ciorga, M. Utz, D. Schuh, D. Bougeard, and D. Weiss

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): M. Oltscher, M. Ciorga, M. Utz, D. Schuh, D. Bougeard, and D. Weiss The injection of spins into a high-mobility two-dimensional electron gas is unexpectedly efficient, suggesting that new theories may be needed to describe spin transport in such systems. [Phys. Rev. Lett. 113, 236602] Published Thu Dec 04, 2014

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

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Fermi-Liquid Computation of the Phase Diagram of High-Tc Cuprate Superconductors with an Orbital Antiferromagnetic Pseudogap (2014)

R. B. Laughlin

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): R. B. Laughlin A 4-parameter Fermi-liquid calculation of the high-Tc cuprate phase diagram is reported. Simultaneously accounted for are the special doping densities of 5% and 16%, the d-wave functional form of the (orbital antiferromagnetic) pseudogap, the measured Tc, superconducting gap, pseudogap and superflui... [Phys. Rev. Lett. 112, 017004] Published Fri Jan 10, 2014

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Spin and Orbital Contributions to Magnetically Ordered Moments in 5d Layered Perovskite Sr2IrO4 (2014)

S. Fujiyama, H. Ohsumi, K. Ohashi, D. Hirai, B. J. Kim, T. Arima, M. Takata, and H. Takagi

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): S. Fujiyama, H. Ohsumi, K. Ohashi, D. Hirai, B. J. Kim, T. Arima, M. Takata, and H. Takagi The ratio of orbital (L) and spin (S) contributions to the magnetically ordered moments of a 5d transition metal oxide, Sr2IrO4 was evaluated by nonresonant magnetic x-ray diffraction. We applied an improved experimental setting that minimized the experimental error, in which we varied only the line... [Phys. Rev. Lett. 112, 016405] Published Fri Jan 10, 2014

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Magnetic Field Induced Transition in Vanadium Spinels (2014)

E. D. Mun, Gia-Wei Chern, V. Pardo, F. Rivadulla, R. Sinclair, H. D. Zhou, V. S. Zapf, and C. D. Batista

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-11

Beschreibung: Author(s): E. D. Mun, Gia-Wei Chern, V. Pardo, F. Rivadulla, R. Sinclair, H. D. Zhou, V. S. Zapf, and C. D. Batista We study vanadium spinels AV2O4(A=Cd,Mg) in pulsed magnetic fields up to 65 T. A jump in magnetization at μ0H≈40 T is observed in the single-crystal MgV2O4, indicating a field induced quantum phase transition between two distinct magnetic orders. In the multiferroic CdV2O4, the field induced transi... [Phys. Rev. Lett. 112, 017207] Published Fri Jan 10, 2014

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

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Anomalous Hall Effect Arising from Noncollinear Antiferromagnetism (2014)

Hua Chen, Qian Niu, and A. H. Mac; Donald

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): Hua Chen, Qian Niu, and A. H. MacDonald As established in the very early work of Edwin Hall, ferromagnetic conductors have an anomalous Hall conductivity contribution that cannot be attributed to Lorentz forces and therefore survives in the absence of a magnetic field. These anomalous Hall conductivities are normally assumed to be proport... [Phys. Rev. Lett. 112, 017205] Published Fri Jan 10, 2014

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Transition linewidth of cross correlations in random intensity fluctuations in electromagnetically induced transparency (2014)

Lei Feng, Pengxiong Li, Mengzhen Zhang, Tun Wang, and Yanhong Xiao

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Lei Feng, Pengxiong Li, Mengzhen Zhang, Tun Wang, and Yanhong Xiao It is known that cross correlation between the random intensity fluctuations of two lasers forming electromagnetically induced transparency (EIT) exhibits a transition from correlation to anticorrelation. We study the linewidth behavior of this transition and have found the linewidth is below the (e... [Phys. Rev. A 89, 013815] Published Tue Jan 14, 2014

Schlagwort(e): Quantum optics, physics of lasers, nonlinear optics, classical optics

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Quantum theory of the inverse Faraday effect (2014)

M. Battiato, G. Barbalinardo, and P. M. Oppeneer

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): M. Battiato, G. Barbalinardo, and P. M. Oppeneer We provide a quantum theoretical description of the magnetic polarization induced by intense circularly polarized light in a material. Such effect—commonly referred to as the inverse Faraday effect—is treated using beyond-linear response theory, considering the applied electromagnetic field as exter... [Phys. Rev. B 89, 014413] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Rotatable magnetic anisotropy in a Fe0.8Ga0.2 thin film with stripe domains: Dynamics versus statics (2014)

S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): S. Tacchi, S. Fin, G. Carlotti, G. Gubbiotti, M. Madami, M. Barturen, M. Marangolo, M. Eddrief, D. Bisero, A. Rettori, and M. G. Pini A comprehensive investigation of rotatable anisotropy in a Fe0.8Ga0.2 thin film with a stripe domain structure has been performed comparing static and dynamic measurements. The stripes' domain formation and their rotation under a transverse magnetic field have been imaged by magnetic force microscop... [Phys. Rev. B 89, 024411] Published Tue Jan 14, 2014

Schlagwort(e): Magnetism

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Unconventional sign-changing superconductivity near quantum criticality in YFe2Ge2 (2014)

Alaska Subedi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Alaska Subedi I present the results of first principles calculations of the electronic structure and magnetic interactions for the recently discovered superconductor YFe2Ge2 and use them to identify the possible nature of superconductivity and quantum criticality in this compound. I find that the Fe 3d derived st... [Phys. Rev. B 89, 024504] Published Tue Jan 14, 2014

Schlagwort(e): Superfluidity and superconductivity

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Localization of charge carriers in the normal state of underdoped Bi2+xSr2−xCuO6+δ (2014)

Huiqian Luo and Hai-Hu Wen

American Physical Society (APS)

In: Physical Review B

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Beschreibung: Author(s): Huiqian Luo and Hai-Hu Wen We report the transport results of underdoped Bi2+xSr2−xCuO6+δ (0.05≤x≤0.40) single crystals. A close relationship between the upturn of in-plane resistivity [ρab(T)] and the sign of magnetoresistance in the normal state upon Bi substitutions is found. Combining the results of the field and angular ... [Phys. Rev. B 89, 024506] Published Tue Jan 14, 2014

Schlagwort(e): Superfluidity and superconductivity

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Topologically Protected Conduction State at Carbon Foam Surfaces: An Ab initio Study (2014)

Zhen Zhu, Zacharias G. Fthenakis, Jie Guan, and David Tománek

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-15

Beschreibung: Author(s): Zhen Zhu, Zacharias G. Fthenakis, Jie Guan, and David Tománek We report results of ab initio electronic structure and quantum conductance calculations indicating the emergence of conduction at the surface of semiconducting carbon foams. The occurrence of new conduction states is intimately linked to the topology of the surface and not limited to foams of eleme... [Phys. Rev. Lett. 112, 026803] Published Tue Jan 14, 2014

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Propagation of thermally induced magnonic spin currents (2014)

Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): Ulrike Ritzmann, Denise Hinzke, and Ulrich Nowak The propagation of magnons in temperature gradients is investigated within the framework of an atomistic spin model with the stochastic Landau-Lifshitz-Gilbert equation as underlying equation of motion. We analyze the magnon accumulation, the magnon temperature profile, as well as the propagation le... [Phys. Rev. B 89, 024409] Published Mon Jan 13, 2014

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Coherent Operations and Screening in Multielectron Spin Qubits (2014)

A. P. Higginbotham, F. Kuemmeth, M. P. Hanson, A. C. Gossard, and C. M. Marcus

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): A. P. Higginbotham, F. Kuemmeth, M. P. Hanson, A. C. Gossard, and C. M. Marcus Multielectron spin qubits are demonstrated, and performance examined by comparing coherent exchange oscillations in coupled single-electron and multielectron quantum dots, measured in the same device. Fast (〉1 GHz) exchange oscillations with a quality factor Q∼15 are found for the multielectron ... [Phys. Rev. Lett. 112, 026801] Published Tue Jan 14, 2014

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From Dia- to Paramagnetic Orbital Susceptibility of Massless Fermions (2014)

A. Raoux, M. Morigi, J.-N. Fuchs, F. Piéchon, and G. Montambaux

American Physical Society (APS)

In: Physical Review Letters

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Beschreibung: Author(s): A. Raoux, M. Morigi, J.-N. Fuchs, F. Piéchon, and G. Montambaux We study the orbital susceptibility of multiband systems with a pair of Dirac points interpolating between honeycomb and dice lattices. Despite having the same zero-field energy spectrum, these different systems exhibit spectacular differences in their orbital magnetic response, ranging from dia- to... [Phys. Rev. Lett. 112, 026402] Published Tue Jan 14, 2014

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Order, Criticality, and Excitations in the Extended Falicov-Kimball Model (2014)

S. Ejima, T. Kaneko, Y. Ohta, and H. Fehske

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-14

Beschreibung: Author(s): S. Ejima, T. Kaneko, Y. Ohta, and H. Fehske Using exact numerical techniques, we investigate the nature of excitonic (electron-hole) bound states and the development of exciton coherence in the one-dimensional half-filled extended Falicov-Kimball model. The ground-state phase diagram of the model exhibits, besides band-insulator and staggered... [Phys. Rev. Lett. 112, 026401] Published Mon Jan 13, 2014

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Tenth-order high-temperature expansion for the susceptibility and the specific heat of spin-s Heisenberg models with arbitrary exchange patterns: Application to pyrochlore and kagome magnets (2014)

Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Andre Lohmann, Heinz-Jürgen Schmidt, and Johannes Richter We present the high-temperature expansion (HTE) up to tenth order of the specific heat C and the uniform susceptibility χ for Heisenberg models with arbitrary exchange patterns and arbitrary spin quantum number s. We encode the algorithm in a c++ program provided in the Supplemental Material [http:/... [Phys. Rev. B 89, 014415] Published Wed Jan 15, 2014

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Cluster functional renormalization group (2014)

Johannes Reuther and Ronny Thomale

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Johannes Reuther and Ronny Thomale Functional renormalization group (FRG) has become a diverse and powerful tool to derive effective low-energy scattering vertices of interacting many-body systems. Starting from a free expansion point of the action, the flow of the RG parameter Λ allows us to trace the evolution of the effective one-... [Phys. Rev. B 89, 024412] Published Wed Jan 15, 2014

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Effect of Electron-Phonon Interactions on Orbital Fluctuations in Iron-Based Superconductors (2014)

Yusuke Nomura, Kazuma Nakamura, and Ryotaro Arita

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Yusuke Nomura, Kazuma Nakamura, and Ryotaro Arita To investigate the possibility of whether electron-phonon coupling can enhance orbital fluctuations in iron-based superconductors, we develop an ab initio method to construct the effective low-energy models including the phonon-related terms. With the derived effective electron-phonon interactions a... [Phys. Rev. Lett. 112, 027002] Published Wed Jan 15, 2014

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Resonant X-Ray Scattering and the jeff=1/2 Electronic Ground State in Iridate Perovskites (2014)

M. Moretti Sala, S. Boseggia, D. F. McMorrow, and G. Monaco

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): M. Moretti Sala, S. Boseggia, D. F. McMorrow, and G. Monaco The resonant x-ray scattering (magnetic elastic, RXMS, and inelastic, RIXS) of Ir4+ at the L2,3 edges relevant to spin-orbit Mott insulators An+1IrnO3n+1 (A=Sr, Ba, etc.) are calculated using a single-ion model which treats the spin-orbit and tetragonal crystal-field terms on an equal footing. Both ... [Phys. Rev. Lett. 112, 026403] Published Wed Jan 15, 2014

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Observation of Edge Transport in the Disordered Regime of Topologically Insulating InAs/GaSb Quantum Wells (2014)

Ivan Knez, Charles T. Rettner, See-Hun Yang, Stuart S. P. Parkin, Lingjie Du, Rui-Rui Du, and Gerard Sullivan

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Ivan Knez, Charles T. Rettner, See-Hun Yang, Stuart S. P. Parkin, Lingjie Du, Rui-Rui Du, and Gerard Sullivan We observe edge transport in the topologically insulating InAs/GaSb system in the disordered regime. Using asymmetric current paths we show that conduction occurs exclusively along the device edge, exhibiting a large Hall signal at zero magnetic fields, while for symmetric current paths, the conduct... [Phys. Rev. Lett. 112, 026602] Published Wed Jan 15, 2014

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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Molecular Quantum Magnetism in LiZn2Mo3O8 (2014)

M. Mourigal, W. T. Fuhrman, J. P. Sheckelton, A. Wartelle, J. A. Rodriguez-Rivera, D. L. Abernathy, T. M. McQueen, and C. L. Broholm

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): M. Mourigal, W. T. Fuhrman, J. P. Sheckelton, A. Wartelle, J. A. Rodriguez-Rivera, D. L. Abernathy, T. M. McQueen, and C. L. Broholm Inelastic neutron scattering at low temperatures T≤30 K from a powder of LiZn2Mo3O8 demonstrates this triangular-lattice antiferromagnet hosts collective magnetic excitations from spin-1/2 Mo3O13 molecules. Apparently gapless (Δ〈0.2 meV) and extending at least up to 2.5 meV, the low-energy magn... [Phys. Rev. Lett. 112, 027202] Published Wed Jan 15, 2014

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

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Thema: Physik

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Counter-propagating Edge Modes and Topological Phases of a Kicked Quantum Hall System (2014)

Mahmoud Lababidi, Indubala I. Satija, and Erhai Zhao

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): Mahmoud Lababidi, Indubala I. Satija, and Erhai Zhao A periodically driven quantum Hall system in a fixed magnetic field is found to exhibit a series of phases featuring anomalous edge modes with the “wrong” chirality. This leads to pairs of counter-propagating chiral edge modes at each edge, in sharp contrast to stationary quantum Hall systems. We sh... [Phys. Rev. Lett. 112, 026805] Published Wed Jan 15, 2014

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

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Thema: Physik

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Cubic Mn2Ga Thin Films: Crossing the Spin Gap with Ruthenium (2014)

H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda, and J. M. D. Coey

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-16

Beschreibung: Author(s): H. Kurt, K. Rode, P. Stamenov, M. Venkatesan, Y.-C. Lau, E. Fonda, and J. M. D. Coey Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280 kA m−1, equivalent to 1.65μB per formula. Adding ruthenium leads to an increase of TC up to 550 K in cubic Mn2RuxGa... [Phys. Rev. Lett. 112, 027201] Published Wed Jan 15, 2014

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

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Nature of Quasielectrons and the Continuum of Neutral Bulk Excitations in Laughlin Quantum Hall Fluids (2014)

Bo Yang and F. D. M. Haldane

American Physical Society (APS)

In: Physical Review Letters

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Publikationsdatum: 2014-01-17

Beschreibung: Author(s): Bo Yang and F. D. M. Haldane We construct model wave functions for a family of single-quasielectron states supported by the ν=1/3 fractional quantum Hall fluid. The charge e*=e/3 quasielectron state is identified as a composite of a charge-2e* quasiparticle and a −e* quasihole, orbiting around their common center of charge with... [Phys. Rev. Lett. 112, 026804] Published Thu Jan 16, 2014

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

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Thema: Physik

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Domain wall motion in junctions of thin-film magnets and topological insulators (2014)

Yago Ferreiros and Alberto Cortijo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-18

Beschreibung: Author(s): Yago Ferreiros and Alberto Cortijo We derive the equations of motionof a domain wall in a thin-film magnet coupled to the surface states of a topological insulator, in the presence of both an electric field along the domain wall and a magnetic field perpendicular to the junction. We show how the electric field acts as a chirality sta... [Phys. Rev. B 89, 024413] Published Fri Jan 17, 2014

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Observation of lock-in phenomena in heavy-ion-irradiated single crystal of Ba(Fe0.93Co0.07)2As2 (2014)

Toshihiro Taen, Hidenori Yagyuda, Yasuyuki Nakajima, Tsuyoshi Tamegai, Oscar Ayala-Valenzuela, Leonardo Civale, Boris Maiorov, Tadashi Kambara, and Yasuyuki Kanai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2014-01-23

Beschreibung: Author(s): Toshihiro Taen, Hidenori Yagyuda, Yasuyuki Nakajima, Tsuyoshi Tamegai, Oscar Ayala-Valenzuela, Leonardo Civale, Boris Maiorov, Tadashi Kambara, and Yasuyuki Kanai The angular dependence of magnetization was measured in an optimally Co-doped BaFe2As2 single crystal, which is irradiated by 2.6 GeV uranium to introduce columnar defects (CDs). At low fields (H), we observe the irreversible magnetization Mirr insensitive to the angle θ around H∥CDs. The field depe... [Phys. Rev. B 89, 024508] Published Wed Jan 22, 2014

Schlagwort(e): Superfluidity and superconductivity

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Thema: Physik

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