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Kapitel Wald (2013)

Lasch, P ; Gutsch, M. ; Reyer, C. ; [weitere]

In: ???

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Publikationsdatum: 2013

Beschreibung: Simulationen mithilfe des Models 4C zu möglichen Auswirkungen der Klimaänderungen des RCP 8.5 Klimaszenariums auf Wälder in Deutschland Kiefer Fichte Eiche Buche KATASTER-BESCHREIBUNG: Auswirkungen des Klimawandels (Temperatur, Niederschlag, CO2-Gehalt der Atmosphäre) auf die Wälder KATASTER-DETAIL: Delta T (Frühjahr) + und Delta Nied (Frühjahr) -, dann Produktivität der Wälder -; Delta C02 + um 25 - 30 %, dann Produktion der Wälder + um 9 - 20%; Delta T + (an nicht wasserlimitierten Standorten), dann Produktivität der Wälder +; Delta CO2+, dann Wassernutzungseffizienz der Wälder +; Delta T (Sommer) +, dann Waldbrandgefahr +; Delta T (Sommer) + und Delta Nied (Sommer) - (= WaBi -), dann Trockenstress der Wälder + um bis zu 9% und dann Produktivität der Wälder -; Delta T (Sommer) + und Delta Nied (Sommer) -, dann Populationsdichte Kiefern-Großschädlinge +;

Schlagwort(e): Deutschland ; 20. und 21. Jahrhundert ; Boden ; Buche ; Eiche ; Fichte ; Forst ; Kiefer ; Klima ; Niederschlag ; Pflanzenschädling ; Phänologie ; Sturmschaden ; Temperatur ; Trockenheit ; Verdunstung ; Waldbrand ; Waldwachstum ; Wassermangel ; Wind ; Grundwasser ; Modell

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Magnetic anisotropy in epitaxial Py/FeMn/Cu(001) and Py/FeMn/Ni/Cu(001) films (2013)

A. Tan, J. Li, C. A. Jenkins, E. Arenholz, A. Scholl, C. Hwang, and Z. Q. Qiu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): A. Tan, J. Li, C. A. Jenkins, E. Arenholz, A. Scholl, C. Hwang, and Z. Q. Qiu Py/FeMn/Cu(001) and Py/FeMn/Ni/Cu(001) films were grown and studied as a function of both the FeMn and the Ni thicknesses using rotating magneto-optic Kerr effect and x-ray magnetic circular dichroism. For Py/FeMn/Cu(001), we find that the FeMn antiferromagnetic order switches the sign of the Py fou... [Phys. Rev. B 88, 104404] Published Fri Sep 06, 2013

Schlagwort(e): Magnetism

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Advanced magnetic anisotropy determination through isothermal remanent magnetization of nanoparticles (2013)

A. Hillion, A. Tamion, F. Tournus, O. Gaier, E. Bonet, C. Albin, and V. Dupuis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): A. Hillion, A. Tamion, F. Tournus, O. Gaier, E. Bonet, C. Albin, and V. Dupuis We propose a theoretical framework enabling the simulation of isothermal remanence magnetization (IRM) curves, based on the Stoner-Wohlfarth model combined with the Néel macrospin relaxation time description. We show how low temperature IRM curves, which have many advantages compared to hysteresis l... [Phys. Rev. B 88, 094419] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Magnetic structure of the frustrated S=1/2 chain magnet LiCu_{2}O_{2} doped with nonmagnetic Zn (2013)

A. A. Bush, N. Büttgen, A. A. Gippius, V. N. Glazkov, W. Kraetschmer, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): A. A. Bush, N. Büttgen, A. A. Gippius, V. N. Glazkov, W. Kraetschmer, L. A. Prozorova, L. E. Svistov, A. M. Vasiliev, and A. Zheludev We present the results of magnetization, electron spin resonance (ESR), and nuclear magnetic resonance (NMR) measurements on single-crystal samples of the frustrated S =1/2 chain cuprate LiCu 2 O 2 doped with nonmagnetic Zn 2+ . As shown by the x-ray techniques, the crystals of Li(Cu 1− x Zn x ) 2 O 2 with x 〈0... [Phys. Rev. B 88, 104411] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Ultrafast and selective coherent population transfer in four-level atoms by a single nonlinearly chirped femtosecond pulse (2013)

Parvendra Kumar and Amarendra K. Sarma

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): Parvendra Kumar and Amarendra K. Sarma We report a simple scheme to achieve ultrafast and selective population transfer in four-level atoms by utilizing a single nonlinearly chirped femtosecond pulse. It is demonstrated that the almost complete population may be transferred to the preselected state of atoms just by manipulating the so-ca... [Phys. Rev. A 88, 033823] Published Fri Sep 13, 2013

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

Print ISSN: 1050-2947

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Thema: Physik

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Chiral anomaly and classical negative magnetoresistance of Weyl metals (2013)

D. T. Son and B. Z. Spivak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): D. T. Son and B. Z. Spivak We consider the classical magnetoresistance of a Weyl metal in which the electron Fermi surface possesses nonzero fluxes of the Berry curvature. Such a system may exhibit large negative magnetoresistance with unusual anisotropy as a function of the angle between the electric and magnetic fields. In ... [Phys. Rev. B 88, 104412] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Theory of Talbot lasers (2013)

H. Guillet de Chatellus, E. Lacot, W. Glastre, O. Jacquin, and O. Hugon

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): H. Guillet de Chatellus, E. Lacot, W. Glastre, O. Jacquin, and O. Hugon We provide a theoretical study of frequency-shifted feedback (FSF) lasers, i.e., lasers with an internal frequency shifter, seeded with a monochromatic wave. The resulting spectrum consists in a set of equidistant modes, labeled by n , whose phases vary quadratically with n . We prove the emergence of... [Phys. Rev. A 88, 033828] Published Tue Sep 17, 2013

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

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Chiral-specific electron-vortex-beam spectroscopy (2013)

J. Yuan, S. M. Lloyd, and M. Babiker

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): J. Yuan, S. M. Lloyd, and M. Babiker Chiral electron-vortex beams, carrying a well-defined orbital angular momentum (OAM) about the propagation axis, are potentially useful as probes of magnetic and other chiral materials. We present an effective operator, expressible in a multipolar form, describing the inelastic processes in which el... [Phys. Rev. A 88, 031801] Published Wed Sep 18, 2013

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

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Schwinger-Keldysh theory for Bose-Einstein condensation of photons in a dye-filled optical microcavity (2013)

A.-W. de Leeuw, H. T. C. Stoof, and R. A. Duine

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): A.-W. de Leeuw, H. T. C. Stoof, and R. A. Duine We consider Bose-Einstein condensation of photons in an optical cavity filled with dye molecules that are excited by laser light. By using the Schwinger-Keldysh formalism we derive a Langevin field equation that describes the dynamics of the photon gas and, in particular, its equilibrium properties ... [Phys. Rev. A 88, 033829] Published Wed Sep 18, 2013

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

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Energy-resolved magnetic domain imaging in TbCo alloys by valence band photoemission magnetic circular dichroism (2013)

Pascal Melchior, Markus Rollinger, Philip Thielen, Sabine Alebrand, Ute Bierbrauer, Christian Schneider, Matthias Gottwald, Michel Hehn, Stéphane Mangin, Mirko Cinchetti, and Martin Aeschlimann

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Pascal Melchior, Markus Rollinger, Philip Thielen, Sabine Alebrand, Ute Bierbrauer, Christian Schneider, Matthias Gottwald, Michel Hehn, Stéphane Mangin, Mirko Cinchetti, and Martin Aeschlimann We report magnetic domain imaging of a terbium cobalt (TbCo) alloy thin film with a high perpendicular magnetic anisotropy in one- and two-photon photoemission electron microscopy (PEEM). Both photoemission processes deliver a clear magnetic circular dichroism (MCD) whose strength is strongly energy... [Phys. Rev. B 88, 104415] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Dzyaloshinskii-Moriya driven helical-butterfly structure in Ba_{3}NbFe_{3}Si_{2}O_{14} (2013)

V. Scagnoli, S. W. Huang, M. Garganourakis, R. A. de Souza, U. Staub, V. Simonet, P. Lejay, and R. Ballou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): V. Scagnoli, S. W. Huang, M. Garganourakis, R. A. de Souza, U. Staub, V. Simonet, P. Lejay, and R. Ballou We have used soft x-ray magnetic diffraction at the Fe 3+ L 2,3 edges to examine to what extent the Dzyaloshinsky-Moriya interaction in Ba 3 NbFe 3 Si 2 O 14 influences its low-temperature magnetic structure. A modulated component of the moments along the c axis is present, adding to the previously proposed ... [Phys. Rev. B 88, 104417] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Coherent magnon and acoustic phonon dynamics in tetragonal and rare-earth-doped BiFeO_{3} multiferroic thin films (2013)

K. I. Doig, F. Aguesse, A. K. Axelsson, N. M. Alford, S. Nawaz, V. R. Palkar, S. P. P. Jones, R. D. Johnson, R. A. Synowicki, and J. Lloyd-Hughes

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): K. I. Doig, F. Aguesse, A. K. Axelsson, N. M. Alford, S. Nawaz, V. R. Palkar, S. P. P. Jones, R. D. Johnson, R. A. Synowicki, and J. Lloyd-Hughes Coherent magnons and acoustic phonons were impulsively excited and probed in thin films of the room temperature multiferroic Bi 1− x − y Dy x La y FeO 3 using femtosecond laser pulses. The elastic moduli of rhombohedral, tetragonal, and rare-earth doped BiFeO 3 were determined from acoustic-mode frequencies in... [Phys. Rev. B 88, 094425] Published Thu Sep 19, 2013

Schlagwort(e): Magnetism

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Orientation dependence of the critical magnetic field for multiferroic BiFeO_{3} (2013)

Randy S. Fishman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Randy S. Fishman Multiferroic BiFeO 3 undergoes a transition from a distorted spiral phase to a G-type antiferromagnet above a critical field H c that depends on the field orientation m . We show that H c ( m ) has a maximum when oriented along a cubic diagonal parallel to the electric polarization P and a minimum in the e... [Phys. Rev. B 88, 104419] Published Fri Sep 20, 2013

Schlagwort(e): Magnetism

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Modular invariance in the gapped XYZ spin-1/2 chain (2013)

Elisa Ercolessi, Stefano Evangelisti, Fabio Franchini, and Francesco Ravanini

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Elisa Ercolessi, Stefano Evangelisti, Fabio Franchini, and Francesco Ravanini We show that the elliptic parametrization of the coupling constants of the quantum X Y Z spin chain can be analytically extended outside of their natural domain, to cover the whole phase diagram of the model, which is composed of 12 adjacent regions, related to one another by a spin rotation. This ext... [Phys. Rev. B 88, 104418] Published Fri Sep 20, 2013

Schlagwort(e): Magnetism

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Comparative studies of resonance enhancement of harmonic radiation in indium plasma using multicycle and few-cycle pulses (2013)

R. A. Ganeev, T. Witting, C. Hutchison, V. V. Strelkov, F. Frank, M. Castillejo, I. Lopez-Quintas, Z. Abdelrahman, J. W. G. Tisch, and J. P. Marangos

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): R. A. Ganeev, T. Witting, C. Hutchison, V. V. Strelkov, F. Frank, M. Castillejo, I. Lopez-Quintas, Z. Abdelrahman, J. W. G. Tisch, and J. P. Marangos Enhanced single harmonic generation is analyzed in indium laser ablation plasmas at excitation conditions of multicycle (30 fs) and few-cycle (3.5 fs) pulses. We demonstrate the strong influence of pulse duration, on the emission spectra from the indium plasma. For few-cycle pulses, the enhanced emi... [Phys. Rev. A 88, 033838] Published Mon Sep 23, 2013

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

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Theory of asymmetric and negative differential magnon tunneling under temperature bias: Towards a spin Seebeck diode and transistor (2013)

Jie Ren and Jian-Xin Zhu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Jie Ren and Jian-Xin Zhu We study the nonequilibrium transport for the asymmetric and negative differential magnon tunneling driven by temperature bias. We demonstrate that the many-body magnon interaction that makes the magnonic spectrum temperature-dependent is the crucial factor for the emergence of rectification and neg... [Phys. Rev. B 88, 094427] Published Mon Sep 23, 2013

Schlagwort(e): Magnetism

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Multimode cavity-assisted quantum storage via continuous phase-matching control (2013)

Alexey Kalachev and Olga Kocharovskaya

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): Alexey Kalachev and Olga Kocharovskaya A scheme for spatial multimode quantum memory is developed such that spatial-temporal structure of a weak signal pulse can be stored and recalled via cavity-assisted off-resonant Raman interaction with a strong angular-modulated control field in an extended Λ -type atomic ensemble. It is shown that e... [Phys. Rev. A 88, 033846] Published Thu Sep 26, 2013

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

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Structural control of magnetic anisotropy in a strain-driven multiferroic EuTiO_{3} thin film (2013)

X. Ke, T. Birol, R. Misra, J.-H. Lee, B. J. Kirby, D. G. Schlom, C. J. Fennie, and J. W. Freeland

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): X. Ke, T. Birol, R. Misra, J.-H. Lee, B. J. Kirby, D. G. Schlom, C. J. Fennie, and J. W. Freeland Octahedral distortion plays a key role in engineering the physical properties of heterostructures composed of perovskite oxides. We observe a strong in-plane uniaxial magnetic anisotropy in a strain-enabled multiferroic EuTiO 3 thin film epitaxially grown on a (110) o DyScO 3 substrate. First-principle... [Phys. Rev. B 88, 094434] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Phase diagram of the spin-1 Heisenberg model with three-site interactions on the square lattice (2013)

F. Michaud and F. Mila

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): F. Michaud and F. Mila We study the spin S =1 antiferromagnetic Heisenberg model on the square lattice with, in addition to the nearest-neighbor interaction, a three-site interaction of the form ( S i · S j )( S j · S k )+H.c. This interaction appears naturally in a strong coupling expansion of the two-orbital, half-filled Hubbard mod... [Phys. Rev. B 88, 094435] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Nuclear magnetic resonance studies of pseudospin fluctuations in URu_{2}Si_{2} (2013)

K. R. Shirer, J. T. Haraldsen, A. P. Dioguardi, J. Crocker, N. ap; Roberts-Warren, A. C. Shockley, C.-H. Lin, D. M. Nisson, J. C. Cooley, M. Janoschek, K. Huang, N. Kanchanavatee, M. B. Maple, M. J. Graf, A. V. Balatsky, and N. J. Curro

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): K. R. Shirer, J. T. Haraldsen, A. P. Dioguardi, J. Crocker, N. apRoberts-Warren, A. C. Shockley, C.-H. Lin, D. M. Nisson, J. C. Cooley, M. Janoschek, K. Huang, N. Kanchanavatee, M. B. Maple, M. J. Graf, A. V. Balatsky, and N. J. Curro We report 29 Si nuclear magnetic resonance measurements in single crystals and aligned powders of URu 2 Si 2 in the hidden order and paramagnetic phases. The spin-lattice relaxation data reveal evidence of pseudospin fluctuations of U moments in the paramagnetic phase. We find evidence for partial suppr... [Phys. Rev. B 88, 094436] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Role of the phase-matching condition in nondegenerate four-wave mixing in hot vapors for the generation of squeezed states of light (2013)

M. T. Turnbull, P. G. Petrov, C. S. Embrey, A. M. Marino, and V. Boyer

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): M. T. Turnbull, P. G. Petrov, C. S. Embrey, A. M. Marino, and V. Boyer Nondegenerate forward four-wave mixing in hot atomic vapors has been shown to produce strong quantum correlations between twin beams of light [ McCormick et al. Opt. Lett. 32 178 (2007) ], in a configuration which minimizes losses by absorption. In this paper, we look at the role of the phase-matchi... [Phys. Rev. A 88, 033845] Published Thu Sep 26, 2013

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

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Chiral properties of hematite α-Fe_{2}O_{3} inferred from resonant Bragg diffraction using circularly polarized x rays (2013)

A. Rodríguez-Fernández, J. A. Blanco, S. W. Lovesey, V. Scagnoli, U. Staub, H. C. Walker, D. K. Shukla, and J. Strempfer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): A. Rodríguez-Fernández, J. A. Blanco, S. W. Lovesey, V. Scagnoli, U. Staub, H. C. Walker, D. K. Shukla, and J. Strempfer Chiral properties of the two phases—collinear motif (below Morin transition temperature, T M ≈250 K) and canted motif (above T M )—of magnetically ordered hematite ( α -Fe 2 O 3 ) have been identified in single-crystal resonant x-ray Bragg diffraction using circular polarized incident x rays tuned near the ir... [Phys. Rev. B 88, 094437] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Spin-torque switching efficiency in CoFeB-MgO based tunnel junctions (2013)

J. Z. Sun, S. L. Brown, W. Chen, E. A. Delenia, M. C. Gaidis, J. Harms, G. Hu, Xin Jiang, R. Kilaru, W. Kula, G. Lauer, L. Q. Liu, S. Murthy, J. Nowak, E. J. O’Sullivan, S. S. P. Parkin, R. P. Robertazzi, P. M. Rice, G. Sandhu, T. Topuria, and D. C. Worledge

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-27

Beschreibung: Author(s): J. Z. Sun, S. L. Brown, W. Chen, E. A. Delenia, M. C. Gaidis, J. Harms, G. Hu, Xin Jiang, R. Kilaru, W. Kula, G. Lauer, L. Q. Liu, S. Murthy, J. Nowak, E. J. O’Sullivan, S. S. P. Parkin, R. P. Robertazzi, P. M. Rice, G. Sandhu, T. Topuria, and D. C. Worledge It is convenient to define the spin-torque switching efficiency in nanostructured magnetic tunnel junctions as the ratio between the free-layers thermal activation barrier height E b and the threshold switching current I c 0 . Recent device exploration has led to occasional observations of spin-torque i... [Phys. Rev. B 88, 104426] Published Thu Sep 26, 2013

Schlagwort(e): Magnetism

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Attosecond pulses at kiloelectronvolt photon energies from high-order-harmonic generation with core electrons (2013)

Christian Buth, Feng He (何峰), Joachim Ullrich, Christoph H. Keitel, and Karen Z. Hatsagortsyan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Christian Buth, Feng He (何峰), Joachim Ullrich, Christoph H. Keitel, and Karen Z. Hatsagortsyan High-order harmonic generation (HHG) in simultaneous intense near-infrared (NIR) laser light and brilliant x rays above an inner-shell absorption edge is examined. A tightly bound inner-shell electron is transferred into the continuum. Then, NIR light takes over and drives the liberated electron thr... [Phys. Rev. A 88, 033848] Published Fri Sep 27, 2013

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

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Magnetoelectric coupling in the Haldane spin-chain system Dy_{2}BaNiO_{5} (2013)

Kiran Singh, Tathamay Basu, S. Chowki, N. Mahapotra, Kartik K. Iyer, P. L. Paulose, and E. V. Sampathkumaran

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): Kiran Singh, Tathamay Basu, S. Chowki, N. Mahapotra, Kartik K. Iyer, P. L. Paulose, and E. V. Sampathkumaran We report the results of various measurements, namely magnetization, complex dielectric permittivity, and electric polarization ( P ), on Dy 2 BaNiO 5 as a function of temperature ( T ) and magnetic field ( H ), apart from heat capacity ( C ), with the primary motivation of exploring the existence of magnetoel... [Phys. Rev. B 88, 094438] Published Fri Sep 27, 2013

Schlagwort(e): Magnetism

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All-optical transistor using a photonic-crystal cavity with an active Raman gain medium (2013)

V. G. Arkhipkin and S. A. Myslivets

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-28

Beschreibung: Author(s): V. G. Arkhipkin and S. A. Myslivets We propose a design of an all-optical transistor based on a one-dimensional photonic-crystal cavity doped with a four-level N -type active Raman gain medium. The calculated results show that in a photonic-crystal cavity of this kind transmission and reflection of the probe (Raman) beam are strongly d... [Phys. Rev. A 88, 033847] Published Fri Sep 27, 2013

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

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Direct spectrotemporal characterization of femtosecond extreme-ultraviolet pulses (2013)

David Gauthier, Benoît Mahieu, and Giovanni De Ninno

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): David Gauthier, Benoît Mahieu, and Giovanni De Ninno We propose a method for straightforward characterization of the temporal shape of femtosecond pulses in the extreme-ultraviolet and soft x-ray spectral region. The approach is based on the presence of a significant linear frequency chirp in the pulse. This allows us to establish an homothetic relati... [Phys. Rev. A 88, 033849] Published Mon Sep 30, 2013

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

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Enhanced index of refraction in four-wave-mixing media (2013)

Elena Kuznetsova, Renuka Rajapakse, and S. F. Yelin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Elena Kuznetsova, Renuka Rajapakse, and S. F. Yelin Refractive index enhancement accompanied by vanishing absorption in a four-level atomic system interacting with two control and two probe fields in a regime of four-wave mixing (FWM) has been predicted and studied in the present work. We analyzed the maximal index enhancement in the four-level FWM s... [Phys. Rev. A 88, 033850] Published Mon Sep 30, 2013

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

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Thermalized polarization dynamics of a discrete optical-waveguide system with four-wave mixing (2013)

S. A. Derevyanko

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): S. A. Derevyanko Statistical mechanics of two coupled vector fields is studied in the tight-binding model that describes propagation of polarized light in discrete waveguides in the presence of the four-wave mixing. The energy and power conservation laws enable the formulation of the equilibrium properties of the po... [Phys. Rev. A 88, 033851] Published Mon Sep 30, 2013

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

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Quantum limits on probabilistic amplifiers (2013)

Shashank Pandey, Zhang Jiang, Joshua Combes, and Carlton M. Caves

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Shashank Pandey, Zhang Jiang, Joshua Combes, and Carlton M. Caves An ideal phase-preserving linear amplifier is a deterministic device that adds to an input signal the minimal amount of noise consistent with the constraints imposed by quantum mechanics. A noiseless linear amplifier takes an input coherent state to an amplified coherent state, but only works part o... [Phys. Rev. A 88, 033852] Published Mon Sep 30, 2013

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

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Enhanced optomechanical readout using optical coalescence (2013)

Claudiu Genes, André Xuereb, Guido Pupillo, and Aurélien Dantan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Claudiu Genes, André Xuereb, Guido Pupillo, and Aurélien Dantan We present a scheme to strongly enhance the readout sensitivity of the squared displacement of a mobile scatterer placed in a Fabry-Pérot cavity. We investigate the largely unexplored regime of cavity electrodynamics in which a highly reflective element positioned between the end mirrors of a symmet... [Phys. Rev. A 88, 033855] Published Mon Sep 30, 2013

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

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Cavity QED of a leaky planar resonator coupled to an atom and an input single-photon pulse (2013)

Denis Gonţa and Peter van Loock

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Denis Gonţa and Peter van Loock In contrast to the free-space evolution of an atom governed by a multimode interaction with the surrounding electromagnetic vacuum, the evolution of a cavity-QED system can be characterized by just three parameters: (i) atom-cavity coupling strength g , (ii) cavity relaxation rate κ , and (iii) atomic... [Phys. Rev. A 88, 033853] Published Mon Sep 30, 2013

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

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Superradiant control of γ-ray propagation by vibrating nuclear arrays (2013)

Xiwen Zhang and Anatoly A. Svidzinsky

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Xiwen Zhang and Anatoly A. Svidzinsky The collective nature of light interactions with atomic and nuclear ensembles yields the fascinating phenomena of superradiance and radiation trapping. We study the interaction of γ rays with a coherently vibrating periodic array of two-level nuclei. Such nuclear motion can be generated, e.g., in io... [Phys. Rev. A 88, 033854] Published Mon Sep 30, 2013

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

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Local symmetries and perfect transmission in aperiodic photonic multilayers (2013)

P. A. Kalozoumis, C. Morfonios, N. Palaiodimopoulos, F. K. Diakonos, and P. Schmelcher

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): P. A. Kalozoumis, C. Morfonios, N. Palaiodimopoulos, F. K. Diakonos, and P. Schmelcher We develop a classification of perfectly transmitting resonances occurring in effectively one-dimensional optical media which are decomposable into locally reflection symmetric parts. The local symmetries of the medium are shown to yield piecewise translation-invariant quantities, which are used to ... [Phys. Rev. A 88, 033857] Published Mon Sep 30, 2013

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

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Cooperative spontaneous emission of three identical atoms (2013)

Wei Feng, Yong Li, and Shi-Yao Zhu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Wei Feng, Yong Li, and Shi-Yao Zhu We study cooperative single-photon spontaneous emission from three multilevel atoms with one of them being excited for different atomic configurations in optical vector theory. The dynamic evolution is solved by finding the eigenvalues of a 3 × 3 matrix, and then the relevant decay rates and Lamb sh... [Phys. Rev. A 88, 033856] Published Mon Sep 30, 2013

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

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Itinerant electronic ferromagnetism in Sr_{2}ScO_{3}CoAs with largely spaced CoAs conduction layers (2013)

Hiroto Ohta, Daisuke Noguchi, Koichiro Nabetani, and Hiroko Aruga Katori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Hiroto Ohta, Daisuke Noguchi, Koichiro Nabetani, and Hiroko Aruga Katori We studied magnetism of Sr 2 ScO 3 CoAs, a member of the group of layered compound with CoAs conducting layers, by using successfully synthesized polycrystalline sample. As a result of magnetic and electric resistivity measurements, Sr 2 ScO 3 CoAs was revealed to be an itinerant electronic ferromagnet with... [Phys. Rev. B 88, 094441] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Magnetocrystalline anisotropy and the magnetocaloric effect in Fe_{2}P (2013)

L. Caron, M. Hudl, V. Höglin, N. H. Dung, C. P. Gomez, M. Sahlberg, E. Brück, Y. Andersson, and P. Nordblad

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): L. Caron, M. Hudl, V. Höglin, N. H. Dung, C. P. Gomez, M. Sahlberg, E. Brück, Y. Andersson, and P. Nordblad Magnetic and magnetocaloric properties of high-purity, giant magnetocaloric polycrystalline and single-crystalline Fe 2 P are investigated. Fe 2 P displays a moderate magnetic entropy change, which spans over 70 K and the presence of strong magnetization anisotropy proves this system is not fully itiner... [Phys. Rev. B 88, 094440] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Magnetic ground state of the M_{n+1}AX_{n}-phase nitride Cr_{2}GaN (2013)

Z. Liu, T. Waki, Y. Tabata, K. Yuge, H. Nakamura, and I. Watanabe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-02

Beschreibung: Author(s): Z. Liu, T. Waki, Y. Tabata, K. Yuge, H. Nakamura, and I. Watanabe Aiming to find magnetic states in the M n +1 A X n phases, we measured the magnetic susceptibility, the resistivity, and nuclear magnetic resonance of Cr 2 Ga X ( X =N and C). Zero-field and longitudinal-field muon spin relaxation experiments were also applied to Cr 2 GaN. A magnetic phase transition, most prob... [Phys. Rev. B 88, 134401] Published Tue Oct 01, 2013

Schlagwort(e): Magnetism

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Controlling multimode coupling by boundary-wave scattering (2013)

Li Ge, Qinghai Song, Brandon Redding, Alexander Eberspächer, Jan Wiersig, and Hui Cao

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Li Ge, Qinghai Song, Brandon Redding, Alexander Eberspächer, Jan Wiersig, and Hui Cao We show that coupling among multiple resonances can be conveniently introduced and controlled by boundary wave scattering. This is demonstrated in optical microcavities of quasicircular shapes, where the couplings of multiple modes are determined by the scattering from harmonic boundary deformations... [Phys. Rev. A 88, 043801] Published Wed Oct 02, 2013

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

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Robust continuous-variable entanglement of microwave photons with cavity electromechanics (2013)

Peng-Bo Li, Shao-Yan Gao, and Fu-Li Li

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Peng-Bo Li, Shao-Yan Gao, and Fu-Li Li We investigate the controllable generation of robust photon entanglement with a circuit cavity electromechanical system, consisting of two superconducting coplanar waveguide cavities capacitively coupled by a nanoscale mechanical resonator. We show that, with this electromechanical system, two-mode ... [Phys. Rev. A 88, 043802] Published Wed Oct 02, 2013

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

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Robust perpendicular exchange coupling in an ultrathin CoO/PtFe double layer: Strain and spin orientation (2013)

Anne D. Lamirand, Márcio M. Soares, Aline Y. Ramos, Hélio C. N. Tolentino, Maurizio De Santis, Julio C. Cezar, Abner de Siervo, and Matthieu Jamet

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Anne D. Lamirand, Márcio M. Soares, Aline Y. Ramos, Hélio C. N. Tolentino, Maurizio De Santis, Julio C. Cezar, Abner de Siervo, and Matthieu Jamet We report on the exchange coupling and magnetic properties of a strained ultrathin CoO/PtFe double layer with perpendicular magnetic anisotropy. The cobalt oxide growth by reactive molecular beam epitaxy on a Pt-terminated PtFe/Pt(001) surface gives rise to a hexagonal surface and a monoclinic disto... [Phys. Rev. B 88, 140401] Published Wed Oct 02, 2013

Schlagwort(e): Magnetism

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Unified approach to mode splitting and scattering loss in high-Q whispering-gallery-mode microresonators (2013)

Qing Li, Ali A. Eftekhar, Zhixuan Xia, and Ali Adibi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): Qing Li, Ali A. Eftekhar, Zhixuan Xia, and Ali Adibi Current theoretical treatments of mode splitting and scattering loss resulting from subwavelength scatterers attached to the surface of high-quality-factor whispering-gallery-mode microresonators are not satisfactory. Different models proposed for distinct scatterer regimes cannot be reconciled. In ... [Phys. Rev. A 88, 033816] Published Fri Sep 06, 2013

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Phase coexistence and magnetically tuneable polarization in cycloidal multiferroics (2013)

I. Fina, V. Skumryev, D. O’Flynn, G. Balakrishnan, and J. Fontcuberta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-07

Beschreibung: Author(s): I. Fina, V. Skumryev, D. O’Flynn, G. Balakrishnan, and J. Fontcuberta In some magnetic ferroelectrics the polarization P direction can be selected by a magnetic field H . Here we show that in a (Y 1− x Sm x )MnO 3 single crystal, both the direction and the magnitude of P can be controlled solely by H . We argue that this remarkable dual control arises from both the phase coex... [Phys. Rev. B 88, 100403] Published Fri Sep 06, 2013

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Two-photon optics of Bessel-Gaussian modes (2013)

Melanie McLaren, Jacquiline Romero, Miles J. Padgett, Filippus S. Roux, and Andrew Forbes

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Melanie McLaren, Jacquiline Romero, Miles J. Padgett, Filippus S. Roux, and Andrew Forbes In this paper we consider geometrical two-photon optics of Bessel-Gaussian modes generated in spontaneous parametric down-conversion of a Gaussian pump beam. We provide a general theoretical expression for the orbital angular momentum (OAM) spectrum and Schmidt number in this basis and show how this... [Phys. Rev. A 88, 033818] Published Mon Sep 09, 2013

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Experimental and theoretical investigation of statistical regimes in random laser emission (2013)

Emilio Ignesti, Federico Tommasi, Lorenzo Fini, Stefano Lepri, Vivekananthan Radhalakshmi, Diederik Wiersma, and Stefano Cavalieri

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-10

Beschreibung: Author(s): Emilio Ignesti, Federico Tommasi, Lorenzo Fini, Stefano Lepri, Vivekananthan Radhalakshmi, Diederik Wiersma, and Stefano Cavalieri We present a theoretical and experimental study aimed at characterizing statistical regimes in a random laser. Both the theoretical simulations and the experimental results show the possibility of three regions of fluctuations increasing the pumping energy. An initial Gaussian regime is followed by ... [Phys. Rev. A 88, 033820] Published Mon Sep 09, 2013

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

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Non-Markovian effect on the precision of parameter estimation (2013)

K. Berrada

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): K. Berrada We study the non-Markovian effect on the dynamics of the quantum Fisher information (QFI) by exactly solving a model consisting of a qubit system subjects to a zero-temperature reservoir for two different non-Markovian conditions: a high- Q cavity slightly off-resonant with the qubit transition frequ... [Phys. Rev. A 88, 035806] Published Tue Sep 10, 2013

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

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Microwave-induced excitations in the kagome system Pr_{3}Ga_{5}SiO_{14} (2013)

Sanhita Ghosh, Saiti Datta, Haidong Zhou, Michael Hoch, Christopher R. Wiebe, Pedro Schlottmann, and Stephen Hill

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-11

Beschreibung: Author(s): Sanhita Ghosh, Saiti Datta, Haidong Zhou, Michael Hoch, Christopher R. Wiebe, Pedro Schlottmann, and Stephen Hill Low-energy excitations in the rare earth kagome spin system Pr 3 Ga 5 SiO 14 (PGS) have been investigated using high-field electron spin resonance (ESR) techniques. Previous work has shown that PGS does not exhibit long-range magnetic order at temperatures down to 30 mK. The present low-temperature (1.3–... [Phys. Rev. B 88, 094414] Published Tue Sep 10, 2013

Schlagwort(e): Magnetism

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Two-photon–two-atom excitation by correlated light states (2013)

Zhan Zheng, Pablo L. Saldanha, José R. Rios Leite, and Claude Fabre

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Zhan Zheng, Pablo L. Saldanha, José R. Rios Leite, and Claude Fabre We study the efficiency of different two-photon states of light to induce the simultaneous excitation of two atoms of different kinds when the sum of the energies of the two photons matches the sum of the energies of the two atomic transitions, while no photons are resonant with each individual tran... [Phys. Rev. A 88, 033822] Published Thu Sep 12, 2013

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

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Spin state and orbital ordering in CuCr_{2}O_{4} investigated by NMR (2013)

Euna Jo, Byeongki Kang, Changsoo Kim, Sangil Kwon, and Soonchil Lee

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Euna Jo, Byeongki Kang, Changsoo Kim, Sangil Kwon, and Soonchil Lee 63,65 Cu and 53 Cr nuclear magnetic resonance spectra for CuCr 2 O 4 were measured at various magnetic fields and temperatures. The microscopic evidence of orbital ordering in CuCr 2 O 4 was obtained from a dipolar hyperfine field, NQR, and magnetic anisotropy analysis of the linewidth broadening of the Cu ... [Phys. Rev. B 88, 094417] Published Thu Sep 12, 2013

Schlagwort(e): Magnetism

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Tailoring magnetic properties of metallic thin films with quantum well states and external electric fields (2013)

T. R. Dasa, P. Ruiz-Díaz, O. O. Brovko, and V. S. Stepanyuk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): T. R. Dasa, P. Ruiz-Díaz, O. O. Brovko, and V. S. Stepanyuk Thickness dependence of magnetic anisotropy energy (MAE) and spin polarization in Fe and Co multilayers on a Pt(001) substrate are investigated with ab initio techniques. As the thickness of the thin films is increased, an oscillatory behavior of the MAE of the systems is observed. For Fe multilayer... [Phys. Rev. B 88, 104409] Published Thu Sep 12, 2013

Schlagwort(e): Magnetism

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Induced magnetism versus Kondo screening in alternating Mott-metal layers (2013)

Aleksander Zujev and Pinaki Sengupta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Aleksander Zujev and Pinaki Sengupta We investigate the magnetic properties of a heterostructure comprised of alternating metallic and Mott insulating layers of fermions with varying interlayer hybridization. Results from large-scale quantum Monte Carlo simulations at half-filling show clear evidence of induced magnetism in the metalli... [Phys. Rev. B 88, 094415] Published Thu Sep 12, 2013

Schlagwort(e): Magnetism

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Binding carriers to a nonmagnetic impurity in a two-dimensional square Ising antiferromagnet (2013)

Hadi Ebrahimnejad and Mona Berciu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-13

Beschreibung: Author(s): Hadi Ebrahimnejad and Mona Berciu A hole in a two-dimensional Ising antiferromagnet was believed to be infinitely heavy due to the string of wrongly oriented spins it creates as it moves, which should trap it near its original location. Trugman showed that, in fact, the hole acquires a finite effective mass due to contributions from... [Phys. Rev. B 88, 104410] Published Thu Sep 12, 2013

Schlagwort(e): Magnetism

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Spontaneous symmetry breaking in a double-defect nonlinear grating (2013)

C. Martijn de Sterke, Irina V. Kabakova, Ishraq Uddin, Jonathan Jeyaratnam, and Boris A. Malomed

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): C. Martijn de Sterke, Irina V. Kabakova, Ishraq Uddin, Jonathan Jeyaratnam, and Boris A. Malomed We study spontaneous symmetry breaking in localized modes trapped by a pair of defects embedded in a Bragg grating written in a Kerr-nonlinear material. While the system has two symmetric modes at low energies, the nonlinearity renders one of these unstable in favor of an asymmetric mode emerging at... [Phys. Rev. A 88, 033825] Published Fri Sep 13, 2013

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

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Unusual temperature-dependent exchange interaction in GdFe_{2}Al_{10} in comparison with GdRu_{2}Al_{10} (2013)

M. Sera, H. Nohara, M. Nakamura, H. Tanida, T. Nishioka, and M. Matsumura

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-14

Beschreibung: Author(s): M. Sera, H. Nohara, M. Nakamura, H. Tanida, T. Nishioka, and M. Matsumura We investigated the magnetic properties of the antiferromagnetic (AFM) compound Gd T 2 Al 10 ( T =Ru and Fe). Although GdRu 2 Al 10 could be understood well as a simple AFM compound, the exchange interaction in GdFe 2 Al 10 is found to be greatly varied with temperature. The magnitude of the AFM exchange intera... [Phys. Rev. B 88, 100404] Published Fri Sep 13, 2013

Schlagwort(e): Magnetism

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Multiple phase transitions in CuO observed with thermal expansion (2013)

A. Rebello, Z. C. M. Winter, S. Viall, and J. J. Neumeier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): A. Rebello, Z. C. M. Winter, S. Viall, and J. J. Neumeier High-resolution thermal-expansion measurements of single-crystalline CuO (tenorite) are reported for the temperature range 5〈 T 〈350 K. The data reveal three transitions ( T N 1 = 213 K, T N 2 = 229.2 K, and T N 3 = 229.8 K), which corroborate the recently proposed magnetic phase diagram [ Villarreal, ... [Phys. Rev. B 88, 094420] Published Mon Sep 16, 2013

Schlagwort(e): Magnetism

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Influence of the magnetic material on tunneling magnetoresistance and spin-transfer torque in tunnel junctions: Ab initio studies (2013)

Christian Franz, Michael Czerner, and Christian Heiliger

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Christian Franz, Michael Czerner, and Christian Heiliger The dependence of tunneling magnetoresistance and spin-transfer torque in FeCo/MgO/FeCo tunnel junctions on the Co concentration and the bias voltage are investigated ab initio . We find that the tunneling magnetoresistance decreases with the Co concentration, in contradiction to previous calculation... [Phys. Rev. B 88, 094421] Published Mon Sep 16, 2013

Schlagwort(e): Magnetism

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Spin-transfer torque and current-induced switching in metallic spin valves with perpendicular polarizers (2013)

Pavel Baláž, Maciej Zwierzycki, and Józef Barnaś

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Pavel Baláž, Maciej Zwierzycki, and Józef Barnaś We present a theoretical description of spin-transfer torque in a spin valve with perpendicularly magnetized polarizer. The polarizer consisting of several ultrathin layers is considered as a single interfacial magnetic scatterer between two nonmagnetic layers, and is included in the theory based on... [Phys. Rev. B 88, 094422] Published Mon Sep 16, 2013

Schlagwort(e): Magnetism

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S=2 quasi-one-dimensional spin waves in CrCl_{2} (2013)

M. B. Stone, G. Ehlers, and G. E. Granroth

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): M. B. Stone, G. Ehlers, and G. E. Granroth We examine the magnetic excitation spectrum in the S =2 Heisenberg antiferromagnet CrCl 2 . Inelastic neutron scattering measurements on powder samples are able to determine the significant exchange interactions in this system. A large anisotropy gap is observed in the spectrum below the Néel temperatu... [Phys. Rev. B 88, 104413] Published Mon Sep 16, 2013

Schlagwort(e): Magnetism

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Intensity-dependent multiorbital effect in high-order harmonics generated from aligned O_{2} molecules (2013)

Jingtao Zhang, Yan Wu, Zhinan Zeng, and Zhizhan Xu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-17

Beschreibung: Author(s): Jingtao Zhang, Yan Wu, Zhinan Zeng, and Zhizhan Xu High-order harmonics generated from multiple orbitals of aligned O 2 molecules are studied theoretically and we focus on the effect of two-center interference during photoexcitation. We find that the contribution of the harmonics generated from different molecular orbitals to the total harmonics vari... [Phys. Rev. A 88, 033826] Published Mon Sep 16, 2013

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

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Influence of Cr doping on the magnetic structure of the FeAs-strips compound CaFe_{4}As_{3}: A single-crystal neutron diffraction study (2013)

P. Manuel, L. C. Chapon, G. Trimarchi, I. S. Todorov, D. Y. Chung, B. Ouladdiaf, M. J. Gutmann, A. J. Freeman, and M. G. Kanatzidis

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-18

Beschreibung: Author(s): P. Manuel, L. C. Chapon, G. Trimarchi, I. S. Todorov, D. Y. Chung, B. Ouladdiaf, M. J. Gutmann, A. J. Freeman, and M. G. Kanatzidis We have studied the magnetic structure of a Cr-doped iron-arsenide compound CaFe 4 As 3 by means of single crystal neutron diffraction. The neutron data reveal that below 90 K, an antiferromagnetic structure with propagation vector k =0 is adopted. Refinement of the magnetic structure using one of the m... [Phys. Rev. B 88, 104414] Published Tue Sep 17, 2013

Schlagwort(e): Magnetism

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Nanostripe of subwavelength width as a switchable semitransparent mirror for spin waves in a magnonic crystal (2013)

R. Huber, T. Schwarze, and D. Grundler

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): R. Huber, T. Schwarze, and D. Grundler Spin wave transmission experiments are performed on a one-dimensional magnonic crystal (MC) where an injection pad for domain walls reverses the magnetization M of selected nanostripes independently from the otherwise saturated MC. The MC consists of a periodic array of 255-nm-wide permalloy nanostr... [Phys. Rev. B 88, 100405] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Seeding patterns for self-organization of photons and atoms (2013)

Wolfgang Niedenzu, Stefan Schütz, Hessam Habibian, Giovanna Morigi, and Helmut Ritsch

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Wolfgang Niedenzu, Stefan Schütz, Hessam Habibian, Giovanna Morigi, and Helmut Ritsch When atoms scatter photons from a transverse laser into a high-finesse optical cavity, they form crystalline structures which maximize the intracavity light field and trap the atoms in the ordered array. Stable organization occurs when the laser field amplitude exceeds a certain threshold. For plana... [Phys. Rev. A 88, 033830] Published Wed Sep 18, 2013

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

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Large spin pumping from epitaxial Y_{3}Fe_{5}O_{12} thin films to Pt and W layers (2013)

H. L. Wang, C. H. Du, Y. Pu, R. Adur, P. C. Hammel, and F. Y. Yang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): H. L. Wang, C. H. Du, Y. Pu, R. Adur, P. C. Hammel, and F. Y. Yang Epitaxial Y 3 Fe 5 O 12 thin films deposited by off-axis sputtering exhibit excellent crystalline quality enabling observation of large spin pumping signals in Pt/Y 3 Fe 5 O 12 and W/Y 3 Fe 5 O 12 bilayers driven by cavity ferromagnetic resonance. The inverse spin Hall voltages reach 2.10 and −5.26 mV in 5-mm-long... [Phys. Rev. B 88, 100406] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Weak ferromagnetism and domain effects in multiferroic LiNbO_{3}-type MnTiO_{3}-II (2013)

Angel M. Arévalo-López and J. Paul Attfield

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-19

Beschreibung: Author(s): Angel M. Arévalo-López and J. Paul Attfield Magnetic order consistent with multiferroism has been observed in the acentric LiNbO 3 -type, high pressure form II of MnTiO 3 using neutron diffraction and magnetization measurements. Spin order below the 28 K magnetic transition has propagation vector (0 0 0), and spins lie in the a b plane. Represent... [Phys. Rev. B 88, 104416] Published Wed Sep 18, 2013

Schlagwort(e): Magnetism

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Force and torque on an electric dipole by spinning light fields (2013)

Antoine Canaguier-Durand, Aurélien Cuche, Cyriaque Genet, and Thomas W. Ebbesen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Antoine Canaguier-Durand, Aurélien Cuche, Cyriaque Genet, and Thomas W. Ebbesen We calculate the optical force and torque applied to an electric dipole by a spinning light field. We find that the dissipative part of the force depends on the orbital energy flow of the field only, because the latter is related to the phase gradient generalized for such a light field. As for the r... [Phys. Rev. A 88, 033831] Published Thu Sep 19, 2013

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

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Second harmonic generation in magnetic nanoparticles with vortex magnetic state (2013)

V. L. Krutyanskiy, I. A. Kolmychek, B. A. Gribkov, E. A. Karashtin, E. V. Skorohodov, and T. V. Murzina

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): V. L. Krutyanskiy, I. A. Kolmychek, B. A. Gribkov, E. A. Karashtin, E. V. Skorohodov, and T. V. Murzina Nonlinear optical properties of a regular array of triangular-shaped vortex magnetic nanoparticles is studied using the optical second harmonic generation (SHG) technique. We demonstrate that the SHG azimuthal anisotropy is consistent with the 3 m symmetry of individual Co nanodots placed in a square... [Phys. Rev. B 88, 094424] Published Thu Sep 19, 2013

Schlagwort(e): Magnetism

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Photon subtraction and addition by a three-level atom in an optical cavity (2013)

Julio Gea-Banacloche and William Wilson

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-20

Beschreibung: Author(s): Julio Gea-Banacloche and William Wilson Rosenblum et al. showed recently that a three-level atom in a cavity can function as a perfect “photon turnstile.” Here we explore how this device reshapes the incident pulses, generalize it to the case of an input coherent state, and consider its use in reverse as a “photon adder.” We find that for... [Phys. Rev. A 88, 033832] Published Thu Sep 19, 2013

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Angular position detection of single nanoparticles on rolled-up optical microcavities with lifted degeneracy (2013)

Shilong Li, Libo Ma, Stefan Böttner, Yongfeng Mei, Matthew R. Jorgensen, Suwit Kiravittaya, and Oliver G. Schmidt

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Shilong Li, Libo Ma, Stefan Böttner, Yongfeng Mei, Matthew R. Jorgensen, Suwit Kiravittaya, and Oliver G. Schmidt Nanoparticle position detection is prevented in highly symmetric whispering-gallery-mode optical microcavities due to the redistributable electric field of resonant light therein. In asymmetric tubular microcavities formed by a rolled-up slab waveguide, the optical resonant modes are split and locke... [Phys. Rev. A 88, 033833] Published Fri Sep 20, 2013

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Superpositions of Lorentzians as the class of causal functions (2013)

Christopher A. Dirdal and Johannes Skaar

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-21

Beschreibung: Author(s): Christopher A. Dirdal and Johannes Skaar We prove that all functions obeying the Kramers-Kronig relations can be approximated as superpositions of Lorentzian functions, to any precision. As a result, the typical textbook analysis of dielectric dispersion response functions in terms of Lorentzians may be viewed as encompassing the whole cla... [Phys. Rev. A 88, 033834] Published Fri Sep 20, 2013

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

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Monopole-based formalism for the diagonal magnetoelectric response (2013)

Nicola A. Spaldin, Michael Fechner, Eric Bousquet, Alexander Balatsky, and Lars Nordström

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-24

Beschreibung: Author(s): Nicola A. Spaldin, Michael Fechner, Eric Bousquet, Alexander Balatsky, and Lars Nordström We develop the formalism of the macroscopic monopolization—that is, the magnetoelectric monopole moment per unit volume—in periodic solids, and discuss its relationship to the magnetoelectric effect. For the series of lithium transition metal phosphate compounds, we use first-principles density func... [Phys. Rev. B 88, 094429] Published Mon Sep 23, 2013

Schlagwort(e): Magnetism

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Breakdown of adiabatic transfer of light in waveguides in the presence of absorption (2013)

Eva-Maria Graefe, Alexei A. Mailybaev, and Nimrod Moiseyev

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Eva-Maria Graefe, Alexei A. Mailybaev, and Nimrod Moiseyev In atomic physics, adiabatic evolution is often used to achieve a robust and efficient population transfer. Many adiabatic schemes have also been implemented in optical waveguide structures. Recently there has been increasing interest in the influence of decay and absorption, and their engineering a... [Phys. Rev. A 88, 033842] Published Wed Sep 25, 2013

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

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Photonic band gap in an imperfect atomic diamond lattice: Penetration depth and effects of finite size and vacancies (2013)

Mauro Antezza and Yvan Castin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Mauro Antezza and Yvan Castin We study the effects of finite size and of vacancies on the photonic band gap recently predicted for an atomic diamond lattice. Close to a J g =0→ J e =1 atomic transition, and for atomic lattices containing up to N ≈3×10 4 atoms, we show how the density of states can be affected by both the shape of the s... [Phys. Rev. A 88, 033844] Published Wed Sep 25, 2013

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

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Structural, electronic, and magnetic properties of the europium chalcogenides: A hybrid-functional DFT study (2013)

Martin Schlipf, Markus Betzinger, Marjana Ležaić, Christoph Friedrich, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Martin Schlipf, Markus Betzinger, Marjana Ležaić, Christoph Friedrich, and Stefan Blügel We analyze the structural, electronic, and magnetic properties of the europium chalcogenide series Eu X ( X =O, S, Se, and Te) using density-functional theory (DFT). To describe the localized 4 f states of Eu, we utilize the parameter-free PBE0 and HSE hybrid functionals and found a systematic qualitati... [Phys. Rev. B 88, 094433] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Dynamical exchange interaction from time-dependent spin density functional theory (2013)

Maria Stamenova and Stefano Sanvito

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Maria Stamenova and Stefano Sanvito We report on ab initio time-dependent spin-dynamics simulations for a two-center magnetic molecular complex within the framework of the time-dependent noncollinear spin-density functional theory. In particular, we discuss how the dynamical behavior of the ab initio spin-density in the time domain ca... [Phys. Rev. B 88, 104423] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Interplay between surface anisotropy and dipolar interactions in an assembly of nanomagnets (2013)

Z. Sabsabi, F. Vernay, O. Iglesias, and H. Kachkachi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Z. Sabsabi, F. Vernay, O. Iglesias, and H. Kachkachi We study the interplay between the effects of surface anisotropy and dipolar interactions in monodisperse assemblies of nanomagnets with oriented anisotropy. We derive asymptotic formulas for the assembly magnetization, taking into account temperature, applied field, core and surface anisotropy, and... [Phys. Rev. B 88, 104424] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Large Seebeck magnetic anisotropy in thin Co films embedded in Cu determined by ab initio investigations (2013)

Voicu Popescu and Peter Kratzer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-09-26

Beschreibung: Author(s): Voicu Popescu and Peter Kratzer The longitudinal thermopower of a Cu/Co/Cu trilayer system exhibits an oscillatory dependence on the thickness of the Co layer, a behavior related to the formation of quantum well states in the minority spin channel. In addition, it is found to be very sensitive to a switching between an in-plane an... [Phys. Rev. B 88, 104425] Published Wed Sep 25, 2013

Schlagwort(e): Magnetism

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Mechanical properties of electron vortices (2013)

S. M. Lloyd, M. Babiker, and J. Yuan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): S. M. Lloyd, M. Babiker, and J. Yuan It is shown how the quantum mechanical mass flux and the electromagnetic fields of an electron Bessel vortex mode generate its intrinsic linear momentum and angular momentum properties. Although the corresponding volume density vectors due to the mass flux contain transverse vector components, their... [Phys. Rev. A 88, 031802] Published Mon Sep 30, 2013

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

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Response to a twist in systems with Z_{p} symmetry: The two-dimensional p-state clock model (2013)

Yuta Kumano, Koji Hukushima, Yusuke Tomita, and Masaki Oshikawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Yuta Kumano, Koji Hukushima, Yusuke Tomita, and Masaki Oshikawa We study response to a twist in the two-dimensional p -state clock model, which has the discrete Z p symmetry. The response is measured in terms of helicity modulus, which is usually defined with respect to an infinitesimal twist. However, we demonstrate that such a definition is inappropriate for the... [Phys. Rev. B 88, 104427] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Spin torque in magnetic tunnel junctions with asymmetric barriers (2013)

Alan Kalitsov, Whasington Silvestre, Mairbek Chshiev, and Julian P. Velev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Alan Kalitsov, Whasington Silvestre, Mairbek Chshiev, and Julian P. Velev We derive expressions for both parallel and perpendicular components of spin transfer torque (STT) in magnetic tunnel junctions (MTJs), which have several important advantages over the currently available expressions: First they are derived in a more realistic approximation, resulting in excellent a... [Phys. Rev. B 88, 104430] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Interlayer coupling in spin valves studied by broadband ferromagnetic resonance (2013)

D. E. Gonzalez-Chavez, R. Dutra, W. O. Rosa, T. L. Marcondes, A. Mello, and R. L. Sommer

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): D. E. Gonzalez-Chavez, R. Dutra, W. O. Rosa, T. L. Marcondes, A. Mello, and R. L. Sommer The magnetization dynamics of coupled and uncoupled spin valves with the structure NiFe (20 nm)/Cu( t Cu )/NiFe (20 nm)/IrMn (10 nm) is probed by broadband ferromagnetic resonance absorption measurements. The coupling intensity between the free and the pinned layers is tailored by varying the Cu thickn... [Phys. Rev. B 88, 104431] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Universal corrections to the entanglement entropy in gapped quantum spin chains: A numerical study (2013)

Emanuele Levi, Olalla A. Castro-Alvaredo, and Benjamin Doyon

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Emanuele Levi, Olalla A. Castro-Alvaredo, and Benjamin Doyon We carry out a numerical study of the bipartite entanglement entropy in the gapped regime of two paradigmatic quantum spin chain models: the Ising chain in an external magnetic field and the antiferromagnetic XXZ model. The universal scaling limit of these models is described by the massive Ising fi... [Phys. Rev. B 88, 094439] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Modification of magnetic anisotropy through 3d-4f coupling in La_{0.75}Pr_{0.25}Co_{2}P_{2} (2013)

Kirill Kovnir, Corey M. Thompson, V. Ovidiu Garlea, Daniel Haskel, Anatolii A. Polyanskii, Haidong Zhou, and Michael Shatruk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Kirill Kovnir, Corey M. Thompson, V. Ovidiu Garlea, Daniel Haskel, Anatolii A. Polyanskii, Haidong Zhou, and Michael Shatruk Magnetic behavior of La 0.75 Pr 0.25 Co 2 P 2 was investigated by a combination of magnetic measurements, magneto-optical imaging, neutron diffraction, and x-ray absorption spectroscopy, including x-ray magnetic circular dichroism. The material crystallizes in the ThCr 2 Si 2 structure type and exhibits three... [Phys. Rev. B 88, 104429] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Competition between spin-orbit coupling and magnetic exchange splitting in Ca_{2}RuO_{4} (2013)

Guo-Qiang Liu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-01

Beschreibung: Author(s): Guo-Qiang Liu The ferromagnetic phase of Ca 2 RuO 4 has been puzzling because the observed magnetic moment m ≈ 0.4 μ B /Ru is surprisingly small, compared with the predicted 2 μ B /Ru. This discrepancy is resolved by considering the interplay of the spin-orbit coupling and Coulomb repulsion, which results in a large enhan... [Phys. Rev. B 88, 104428] Published Mon Sep 30, 2013

Schlagwort(e): Magnetism

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Ab initio calculation of the effective on-site Coulomb interaction parameters for half-metallic magnets (2013)

Ersoy Şaşıoğlu, Iosif Galanakis, Christoph Friedrich, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-03

Beschreibung: Author(s): Ersoy Şaşıoğlu, Iosif Galanakis, Christoph Friedrich, and Stefan Blügel Correlation effects play an important role in the electronic structure of half-metallic (HM) magnets. In particular, they give rise to nonquasiparticle states above (or below) the Fermi energy at finite temperatures that reduce the spin polarization and, as a consequence, the efficiency of spintroni... [Phys. Rev. B 88, 134402] Published Wed Oct 02, 2013

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Ground state phase diagram of generic XY pyrochlore magnets with quantum fluctuations (2013)

Anson W. C. Wong, Zhihao Hao, and Michel J. P. Gingras

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): Anson W. C. Wong, Zhihao Hao, and Michel J. P. Gingras Motivated by recent experimental and theoretical progress on the Er 2 Ti 2 O 7 pyrochlore X Y antiferromagnet, we study the general problem of quantum order-by-disorder in pyrochlore X Y systems. We consider the nearest-neighbor pseudo-spin-1/2 Hamiltonian for such a system characterized by anisotropic spi... [Phys. Rev. B 88, 144402] Published Thu Oct 03, 2013

Schlagwort(e): Magnetism

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Possible realization of a multichannel Kondo model in a system of magnetic chains (2013)

A. M. Tsvelik and Wei-Guo Yin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): A. M. Tsvelik and Wei-Guo Yin We discuss a possible realization of overscreened N -channel Kondo model in quasi-one-dimensional magnets. We suggest that it is feasible to have arrangements for N from 2 to 6 and discuss the related quantum chemistry problems. [Phys. Rev. B 88, 144401] Published Thu Oct 03, 2013

Schlagwort(e): Magnetism

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ESR of the quasi-two-dimensional antiferromagnet CuCrO_{2} with a triangular lattice (2013)

A. M. Vasiliev, L. A. Prozorova, L. E. Svistov, V. Tsurkan, V. Dziom, A. Shuvaev, Anna Pimenov, and A. Pimenov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-04

Beschreibung: Author(s): A. M. Vasiliev, L. A. Prozorova, L. E. Svistov, V. Tsurkan, V. Dziom, A. Shuvaev, Anna Pimenov, and A. Pimenov Using the electron-spin-resonance technique we investigate the magnetic structure of CuCrO 2 , a quasi-two-dimensional antiferromagnet with a weakly distorted triangular lattice. Resonance frequencies and the excitation conditions in CuCrO 2 at low temperatures are well described in the frame of cycloi... [Phys. Rev. B 88, 144403] Published Thu Oct 03, 2013

Schlagwort(e): Magnetism

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Exchange interactions and local-moment fluctuation corrections in ferromagnets at finite temperatures based on noncollinear density-functional calculations (2013)

Marjana Ležaić, Phivos Mavropoulos, Gustav Bihlmayer, and Stefan Blügel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Marjana Ležaić, Phivos Mavropoulos, Gustav Bihlmayer, and Stefan Blügel We explore the derivation of interatomic exchange interactions in ferromagnets within density-functional theory (DFT) and the mapping of DFT results onto a spin Hamiltonian. We delve into the problem of systems comprising atoms with strong spontaneous moments together with atoms with weak induced mo... [Phys. Rev. B 88, 134403] Published Fri Oct 04, 2013

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Ferromagnetic ordering and half-metallic state of Sn_{2}Co_{3}S_{2} with the shandite-type structure (2013)

W. Schnelle, A. Leithe-Jasper, H. Rosner, F. M. Schappacher, R. Pöttgen, F. Pielnhofer, and R. Weihrich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): W. Schnelle, A. Leithe-Jasper, H. Rosner, F. M. Schappacher, R. Pöttgen, F. Pielnhofer, and R. Weihrich Single crystalline Sn 2 Co 3 S 2 with the shandite-type structure was investigated by magnetization, magnetoresistance, Hall effect, and heat capacity measurements and by 119 Sn Mößbauer spectroscopy. Sn 2 Co 3 S 2 orders ferromagnetically at 172 K with an easy-axis magnetization of ≈1 μ B along the hexagonal c ... [Phys. Rev. B 88, 144404] Published Fri Oct 04, 2013

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Spectral invariance and the scaling law with random electromagnetic fields (2013)

Timo Hassinen, Jani Tervo, Tero Setälä, Jari Turunen, and Ari T. Friberg

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): Timo Hassinen, Jani Tervo, Tero Setälä, Jari Turunen, and Ari T. Friberg We consider the far-zone spectrum generated by finite, statistically homogeneous, planar electromagnetic sources having three electric field components. We introduce an electromagnetic scaling law which ensures spectral invariance, i.e., that the normalized far-zone spectrum is the same in any parax... [Phys. Rev. A 88, 043804] Published Fri Oct 04, 2013

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

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Measurement of the Gouy phase anomaly for electron waves (2013)

T. C. Petersen, D. M. Paganin, M. Weyland, T. P. Simula, S. A. Eastwood, and M. J. Morgan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): T. C. Petersen, D. M. Paganin, M. Weyland, T. P. Simula, S. A. Eastwood, and M. J. Morgan We measure the Gouy phase anomaly for matter waves using in-line holography to retrieve the full complex field of an astigmatic electron wave function. Sequential phase shifts of π/2 rad are observed for electron trajectories along the optic axis that pass through each line-focus caustic of subnanom... [Phys. Rev. A 88, 043803] Published Fri Oct 04, 2013

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

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Magnetic phase transition in the low-dimensional compound BaMn_{2}Si_{2}O_{7} (2013)

J. Ma, C. D. Dela Cruz, Tao Hong, W. Tian, A. A. Aczel, Songxue Chi, J.-Q. Yan, Z. L. Dun, H. D. Zhou, and M. Matsuda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-10-05

Beschreibung: Author(s): J. Ma, C. D. Dela Cruz, Tao Hong, W. Tian, A. A. Aczel, Songxue Chi, J.-Q. Yan, Z. L. Dun, H. D. Zhou, and M. Matsuda The structural and magnetic properties of BaMn 2 Si 2 O 7 have been investigated. The magnetic susceptibility and specific heat, measured using single crystals, suggest that the quasi-one-dimensional magnetism originating from the loosely coupled Mn 2+ chain carrying S =5/2 is present at high temperatures,... [Phys. Rev. B 88, 144405] Published Fri Oct 04, 2013

Schlagwort(e): Magnetism

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Cooperative fluorescence from a strongly driven dilute cloud of atoms (2013)

J. R. Ott, M. Wubs, P. Lodahl, N. A. Mortensen, and R. Kaiser

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): J. R. Ott, M. Wubs, P. Lodahl, N. A. Mortensen, and R. Kaiser We investigate cooperative fluorescence in a dilute cloud of strongly driven two-level emitters. Starting from the Heisenberg equations of motion, we compute the first-order scattering corrections to the saturation of the excited-state population and to the resonance-fluorescence spectrum, which bot... [Phys. Rev. A 87, 061801] Published Wed Jun 05, 2013

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

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Digitale ISSN: 1094-1622

Thema: Physik

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Quantitative study of the spin Hall magnetoresistance in ferromagnetic insulator/normal metal hybrids (2013)

Matthias Althammer, Sibylle Meyer, Hiroyasu Nakayama, Michael Schreier, Stephan Altmannshofer, Mathias Weiler, Hans Huebl, Stephan Geprägs, Matthias Opel, Rudolf Gross, Daniel Meier, Christoph Klewe, Timo Kuschel, Jan-Michael Schmalhorst, Günter Reiss, Liming Shen, Arunava Gupta, Yan-Ting Chen, Gerrit E. W. Bauer, Eiji Saitoh, and Sebastian T. B. Goennenwein

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Matthias Althammer, Sibylle Meyer, Hiroyasu Nakayama, Michael Schreier, Stephan Altmannshofer, Mathias Weiler, Hans Huebl, Stephan Geprägs, Matthias Opel, Rudolf Gross, Daniel Meier, Christoph Klewe, Timo Kuschel, Jan-Michael Schmalhorst, Günter Reiss, Liming Shen, Arunava Gupta, Yan-Ting Chen, Gerrit E. W. Bauer, Eiji Saitoh, and Sebastian T. B. Goennenwein We experimentally investigate and quantitatively analyze the spin Hall magnetoresistance effect in ferromagnetic insulator/platinum and ferromagnetic insulator/nonferromagnetic metal/platinum hybrid structures. For the ferromagnetic insulator, we use either yttrium iron garnet, nickel ferrite, or ma... [Phys. Rev. B 87, 224401] Published Wed Jun 05, 2013

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

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Periodic magnetization structures generated by transverse spin current in magnetic nanowires (2013)

Volodymyr P. Kravchuk, Oleksii M. Volkov, Denis D. Sheka, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-06

Beschreibung: Author(s): Volodymyr P. Kravchuk, Oleksii M. Volkov, Denis D. Sheka, and Yuri Gaididei The magnetization behavior of long nanowires with square cross section under the influence of strong perpendicular spin-polarized current is studied theoretically. The study is based on Landau-Lifshitz-Slonczewski phenomenology. Without the current the wire is magnetized uniformly along its axis. Fo... [Phys. Rev. B 87, 224402] Published Wed Jun 05, 2013

Schlagwort(e): Magnetism

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Role of critical spin fluctuations in ultrafast demagnetization of transition-metal rare-earth alloys (2013)

V. López-Flores, N. Bergeard, V. Halté, C. Stamm, N. Pontius, M. Hehn, E. Otero, E. Beaurepaire, and C. Boeglin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-12

Beschreibung: Author(s): V. López-Flores, N. Bergeard, V. Halté, C. Stamm, N. Pontius, M. Hehn, E. Otero, E. Beaurepaire, and C. Boeglin Ultrafast magnetization dynamics induced by femtosecond laser pulses have been measured in ferrimagnetic Co 0.8 Gd 0.2 , Co 0.74 Tb 0.26 , and Co 0.86 Tb 0.14 alloys. Using element sensitivity of x-ray magnetic circular dichroism at the Co L 3 , Tb M 5 , and Gd M 5 edges, we see that the demagnetization dynamics is... [Phys. Rev. B 87, 214412] Published Tue Jun 11, 2013

Schlagwort(e): Magnetism

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Thema: Physik

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Two-color high-order-harmonic generation: Relativistic mirror effects and attosecond pulses (2013)

S. Mirzanejad and M. Salehi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-12

Beschreibung: Author(s): S. Mirzanejad and M. Salehi In this work, an analytical and numerical study of the relativistic interaction of a linearly polarized laser field of ω 1 and ω 2 frequencies with highly overdense plasma at normal and oblique incidence is presented. Combining harmonics of ω 1 and ω 2 frequencies causes the amplitude oscillation of rel... [Phys. Rev. A 87, 063815] Published Tue Jun 11, 2013

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

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

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Coexistence of magnetic order and spin-glass-like phase in the pyrochlore antiferromagnet Na_{3}Co(CO_{3})_{2}Cl (2013)

Zhendong Fu, Yanzhen Zheng, Yinguo Xiao, Subhankar Bedanta, Anatoliy Senyshyn, Giovanna Giulia Simeoni, Yixi Su, Ulrich Rücker, Paul Kögerler, and Thomas Brückel

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): Zhendong Fu, Yanzhen Zheng, Yinguo Xiao, Subhankar Bedanta, Anatoliy Senyshyn, Giovanna Giulia Simeoni, Yixi Su, Ulrich Rücker, Paul Kögerler, and Thomas Brückel We present comprehensive investigations on a pyrochlore antiferromagnet Na 3 Co(CO 3 ) 2 Cl. Performed dc magnetization indicates a broad maximum at around 4 K. The field dependence of the peak temperature of this maximum follows the de Almeida–Thouless line, suggesting a spin-glass-like phase transition.... [Phys. Rev. B 87, 214406] Published Thu Jun 06, 2013

Schlagwort(e): Magnetism

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Newton's cradles in optics: From N-soliton fission to soliton chains (2013)

R. Driben, B. A. Malomed, A. V. Yulin, and D. V. Skryabin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2013-06-07

Beschreibung: Author(s): R. Driben, B. A. Malomed, A. V. Yulin, and D. V. Skryabin A mechanism for creating a Newton's cradle (NC) in nonlinear light wave trains under the action of the third-order dispersion (TOD) is demonstrated. The formation of the NC structure plays an important role in the process of fission of higher-order ( N ) solitons in optical fibers. After the splitting... [Phys. Rev. A 87, 063808] Published Thu Jun 06, 2013

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

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Digitale ISSN: 1094-1622

Thema: Physik

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Entanglement, magnetism, and metal-insulator transitions in fermionic superlattices (2013)

Tiago Mendes-Santos, Thereza Paiva, and Raimundo R. dos Santos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2013-06-08

Beschreibung: Author(s): Tiago Mendes-Santos, Thereza Paiva, and Raimundo R. dos Santos We discuss how entanglement of strongly correlated fermions is influenced by a superlattice structure by considering a one-dimensional Hubbard superlattice, made up of a repeated pattern of L U repulsive sites followed by L 0 free sites. Lanczos diagonalization of lattices up to 24 sites is used to ca... [Phys. Rev. B 87, 214407] Published Fri Jun 07, 2013

Schlagwort(e): Magnetism

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Thema: Physik

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