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Polarization singularities in a sum-frequency light beam generated by a bichromatic singular beam in the bulk of an isotropic nonlinear chiral medium (2015)

K. S. Grigoriev, V. A. Makarov, and I. A. Perezhogin

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): K. S. Grigoriev, V. A. Makarov, and I. A. Perezhogin Expressions for the electric field at a sum frequency generated by a collinear elliptically polarized Gaussian beam and circularly polarized Laguerre-Gaussian beam in an isotropic chiral nonlinear medium are obtained in quadratures. The amount and locations of C points in the cross section of a sign… [Phys. Rev. A 92, 023814] Published Mon Aug 10, 2015

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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Dynamical many-body phases of the parametrically driven, dissipative Dicke model (2015)

R. Chitra and O. Zilberberg

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): R. Chitra and O. Zilberberg Control and manipulation of quantum engineered systems allows for the utilization of time-dependent parametric modulations for accessing novel out-of-equilibrium phenomena. In the absence of such driving, the dissipative Dicke model exhibits a fascinating out-of-equilibrium many-body phase transitio… [Phys. Rev. A 92, 023815] Published Mon Aug 10, 2015

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

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Light trapping above the light cone in a one-dimensional array of dielectric spheres (2015)

Evgeny N. Bulgakov and Almas F. Sadreev

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Evgeny N. Bulgakov and Almas F. Sadreev We demonstrate bound states in the first TE and TM diffraction continua (BSC) in a linear periodic array of dielectric spheres in air above the light cone. We classify the BSCs according to the symmetry specified by the azimuthal number m , the Bloch wave vector β directed along the array, and polari… [Phys. Rev. A 92, 023816] Published Mon Aug 10, 2015

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

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Site dependence of the Kondo scale in CePd_{1−x} Rh_{x} due to Pd-Rh disorder (2015)

U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): U. Stockert, S. Hartmann, M. Deppe, N. Caroca-Canales, J. G. Sereni, C. Geibel, and F. Steglich We present measurements of the thermopower S ( T ) on CePd 1 − x Rh x between 2 K and 300 K. For low Rh content, the system behaves as a ferromagnetic Kondo system with a Curie temperature T C of about 6 K, a Kondo scale smaller than T C , and an overall crystal electric field splitting of 210 K. As the Rh con… [Phys. Rev. B 92, 054415] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Torsion-induced effects in magnetic nanowires (2015)

Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Denis D. Sheka, Volodymyr P. Kravchuk, Kostiantyn V. Yershov, and Yuri Gaididei A magnetic helix wire is one of the simplest magnetic systems which manifests properties of both curvature and torsion. Possible equilibrium magnetization states in the helix wire with different anisotropy directions are studied theoretically. There exist two equilibrium states in the helix wire wit… [Phys. Rev. B 92, 054417] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Exchange bias effect in Au-Fe_{3} O_{4} dumbbell nanoparticles induced by the charge transfer from gold (2015)

Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Mikhail Feygenson, John C. Bauer, Zheng Gai, Carlos Marques, Meigan C. Aronson, Xiaowei Teng, Dong Su, Vesna Stanic, Volker S. Urban, Kevin A. Beyer, and Sheng Dai We have studied the origin of the exchange bias effect in the Au-Fe 3 O 4 dumbbell nanoparticles in two samples with different sizes of the Au seed nanoparticles (4.1 and 2.7 nm) and same size of Fe 3 O 4 nanoparticles (9.8 nm). The magnetization, small-angle neutron-scattering, synchrotron x-ray diffract… [Phys. Rev. B 92, 054416] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Large perpendicular magnetic anisotropy in magnetostrictive Fe_{1−x} Ga_{x} thin films (2015)

M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): M. Barturen, J. Milano, M. Vásquez-Mansilla, C. Helman, M. A. Barral, A. M. Llois, M. Eddrief, and M. Marangolo In this work we report the appearance of a large perpendicular magnetic anisotropy (PMA) in Fe 1 − x Ga x thin films grown onto ZnSe/GaAs(001). This arising anisotropy is related to the tetragonal metastable phase in as-grown samples recently reported [M. Eddrief et al. , Phys. Rev. B 84 , 161410 (2011) ].… [Phys. Rev. B 92, 054418] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Spin waves in one-dimensional bicomponent magnonic quasicrystals (2015)

J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): J. Rychły, J. W. Kłos, M. Mruczkiewicz, and M. Krawczyk We studied a finite Fibonacci sequence of Co and Py stripes aligned side by side and in direct contact with each other. Calculations based on a continuous model, including exchange and dipole interactions, were performed for structures feasible for fabrication and characterization of the main proper… [Phys. Rev. B 92, 054414] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Optical theorem for the conservation of electromagnetic helicity: Significance for molecular energy transfer and enantiomeric discrimination by circular dichroism (2015)

Manuel Nieto-Vesperinas

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Manuel Nieto-Vesperinas We put forward the physical meaning of the conservation equation for the helicity on scattering of an electromagnetic field with a generally magnetodielectric bi-isotropic dipolar object. This is the optical theorem for the helicity that, as we find, plays a role for this quantity analogous to that … [Phys. Rev. A 92, 023813] Published Mon Aug 10, 2015

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

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Architecture dependence of photon antibunching in cavity quantum electrodynamics (2015)

Matthew Bradford and Jung-Tsung Shen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Matthew Bradford and Jung-Tsung Shen We investigate numerically the architecture dependence of the characteristics of antibunched photons generated in cavity quantum electrodynamic systems. We show that the quality of antibunching [the smallness of the second-order intensity correlation function at zero time g ( 2 ) ( 0 ) ] and the generation… [Phys. Rev. A 92, 023810] Published Mon Aug 10, 2015

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

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Magnetization dynamics of coupled ferromagnetic disks (2015)

Olle Heinonen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Olle Heinonen The magnetization configuration in two stacked micron-size ferromagnetic disks can assume different equilibrium states depending on the interfacial coupling between the disks. Here I examine the magnetization dynamics in response to an out-of-plane field pulse for different equilibrium states. For a… [Phys. Rev. B 92, 054420] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Broadband biphotons in a single spatial mode (2015)

K. G. Katamadze, N. A. Borshchevskaya, I. V. Dyakonov, A. V. Paterova, and S. P. Kulik

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): K. G. Katamadze, N. A. Borshchevskaya, I. V. Dyakonov, A. V. Paterova, and S. P. Kulik We demonstrate the experimental technique for generating a spatial single-mode broadband biphoton field. The method is based on a dispersive optical element which precisely tailors the structure of the type-I spontaneous parametric down-conversion (SPDC) frequency angular spectrum in order to shift … [Phys. Rev. A 92, 023812] Published Mon Aug 10, 2015

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

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Single-photon level study of microwave properties of lithium niobate at millikelvin temperatures (2015)

Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Maxim Goryachev, Nikita Kostylev, and Michael E. Tobar The properties of doped and natural impurities in lithium niobate single crystals are studied using the whispering gallery mode method at low temperatures as a function of magnetic field. The study reveals considerable coupling of microwave photon modes to the Fe 3 + spin ensemble in iron-doped and no… [Phys. Rev. B 92, 060406(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Critical suppression of spin Seebeck effect by magnetic fields (2015)

Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Takashi Kikkawa, Ken-ichi Uchida, Shunsuke Daimon, Zhiyong Qiu, Yuki Shiomi, and Eiji Saitoh The longitudinal spin Seebeck effect (LSSE) in Pt / Y 3 Fe 5 O 12 ( YIG ) junction systems has been investigated at various magnetic fields and temperatures. We found that the LSSE voltage in a Pt/YIG-slab system is suppressed by applying high magnetic fields and this suppression is critically enhanced at low… [Phys. Rev. B 92, 064413] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Skyrmion dynamics in chiral ferromagnets (2015)

Stavros Komineas and Nikos Papanicolaou

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Stavros Komineas and Nikos Papanicolaou We study the dynamics of skyrmions in Dzyaloshinskii-Moriya materials with easy-axis anisotropy. An important link between topology and dynamics is established through the construction of unambiguous conservation laws obtained earlier in connection with magnetic bubbles and vortices. In particular, … [Phys. Rev. B 92, 064412] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Mechanical cooling in single-photon optomechanics with quadratic nonlinearity (2015)

Wen-ju Gu, Zhen Yi, Li-hui Sun, and Da-hai Xu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Wen-ju Gu, Zhen Yi, Li-hui Sun, and Da-hai Xu In the paper we study the nonlinear mechanical cooling processes in an intrinsic quadratically optomechanical coupling system without linearizing the optomechanical interaction. We apply scattering theory to calculate the transition rates between different mechanical Fock states using the resolvent … [Phys. Rev. A 92, 023811] Published Mon Aug 10, 2015

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

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Boosting domain wall propagation by notches (2015)

H. Y. Yuan and X. R. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): H. Y. Yuan and X. R. Wang We report a counterintuitive finding that notches in an otherwise homogeneous magnetic nanowire can boost current-induced domain wall (DW) propagation. DW motion in notch-modulated wires can be classified into three phases: (1) A DW is pinned around a notch when the current density is below the depi… [Phys. Rev. B 92, 054419] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Suppression of the impurity-induced local magnetism by the opening of a spin pseudogap in Ni-doped Sr_{2} CuO_{3} (2015)

Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-11

Beschreibung: Author(s): Yannic Utz, Franziska Hammerath, Satoshi Nishimoto, Christian Hess, Neela Sekhar Beesetty, Romuald Saint-Martin, Alexandre Revcolevschi, Bernd Büchner, and Hans-Joachim Grafe The S = 1 / 2 antiferromagnetic Heisenberg spin chain compound Sr 2 CuO 3 doped with 1 % and 2 % of Ni impurities has been studied by means of Cu 63 nuclear magnetic resonance. A strong decrease of the spin-lattice relaxation rate T 1 − 1 at low temperatures points toward a spin gap, while a stretching exponent … [Phys. Rev. B 92, 060405(R)] Published Mon Aug 10, 2015

Schlagwort(e): Magnetism

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Electromagnetically-induced-transparency-related phenomena and their mechanical analogs (2015)

J. A. Souza, L. Cabral, R. R. Oliveira, and C. J. Villas-Boas

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): J. A. Souza, L. Cabral, R. R. Oliveira, and C. J. Villas-Boas Systems of interacting classical harmonic oscillators have received considerable attention in the past years as analog models for describing electromagnetically induced transparency (EIT) and associated phenomena. We review these models and investigate their validity for a variety of physical system… [Phys. Rev. A 92, 023818] Published Tue Aug 11, 2015

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

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Interfacial properties of LaMnO_{3} /LaNiO_{3} superlattices grown along (001) and (111) orientations (2015)

C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): C. Piamonteze, M. Gibert, J. Heidler, J. Dreiser, S. Rusponi, H. Brune, J.-M. Triscone, F. Nolting, and U. Staub We have employed x-ray absorption spectroscopy and x-ray magnetic circular dichroism (XMCD) at the Ni and Mn L 3 , 2 edges in LaMnO 3 / LaNiO 3 superlattices grown along (001) and (111) orientations. Our results show a significant XMCD signal and thus the presence of magnetic moments localized on both Ni a… [Phys. Rev. B 92, 014426] Published Wed Jul 29, 2015

Schlagwort(e): Magnetism

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Stretched cavity soliton in dispersion-managed Kerr resonators (2015)

Chengying Bao and Changxi Yang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Chengying Bao and Changxi Yang Stretched cavity soliton (SCS) in dispersion-managed nonlinear resonators is numerically investigated. SCS is found to stretch and compress twice during a round-trip propagation inside the dispersion-managed resonator, exhibiting a pulse dynamics similar to dispersion-managed mode-locked femtosecond… [Phys. Rev. A 92, 023802] Published Mon Aug 03, 2015

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

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Dynamics of optical pulses in highly noninstantaneous Kerr media (2015)

Weiyi Hong (洪伟毅), Qi Guo (郭旗), and Lu Li (李禄)

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Weiyi Hong (洪伟毅), Qi Guo (郭旗), and Lu Li (李禄) The dynamics of optical pulses in noninstantaneous Kerr media are considered. It is found that the “mass center” of the localized profile exhibits an accelerated transversal (on the time axis) motion during propagation. In the highly noninstantaneous regime, especially, the motion can approximately … [Phys. Rev. A 92, 023803] Published Mon Aug 03, 2015

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

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Schwinger boson mean field perspective on emergent spins in diluted Heisenberg antiferromagnets (2015)

Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Shivam Ghosh, Hitesh J. Changlani, and Christopher L. Henley Using an adaptation of Schwinger boson mean field theory (SBMFT) for nonuniform systems, we study the nature of low-energy spin excitations on the square and Bethe lattices at their percolation threshold. The optimal SBMFT parameters are interpreted as on-site potentials and pairing amplitudes, whic… [Phys. Rev. B 92, 064401] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Dynamics of photoinduced change of magnetoanisotropy parameter in orthoferrites probed with terahertz excited coherent spin precession (2015)

Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Keita Yamaguchi, Takayuki Kurihara, Hiroshi Watanabe, Makoto Nakajima, and Tohru Suemoto The effects of femtosecond laser excitation on the anisotropy parameter in orthoferrites ErFe O 3 and DyFe O 3 were probed through Faraday rotation induced by coherent spin precession, which was triggered by a terahertz pulse. Through the delayed frequency shift of the precession, gradual change in the … [Phys. Rev. B 92, 064404] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Quantum pressure and chemical bonding: Influence of magnetic fields on electron localization (2015)

Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Jianmin Tao, Shi Liu, Fan Zheng, and Andrew M. Rappe Chemical bonding is the central concept of chemistry that has been used to explain the properties of molecules and solids as well as chemical processes. In recent years, considerable progress has been made toward a simple and yet fundamental understanding of this concept for isolated systems. Here w… [Phys. Rev. B 92, 060401(R)] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Thermal conductivity in large−J two-dimensional antiferromagnets: Role of phonon scattering (2015)

A. L. Chernyshev and Wolfram Brenig

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. L. Chernyshev and Wolfram Brenig Motivated by the recent heat transport experiments in two-dimensional antiferromagnets, such as La 2 CuO 4 , where the exchange coupling J is larger than the Debye energy Θ D , we discuss different types of relaxation processes for magnon heat current with a particular focus on coupling to three-dimension… [Phys. Rev. B 92, 054409] Published Wed Aug 05, 2015

Schlagwort(e): Magnetism

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Fluctuation relations for spin currents (2015)

Chenjie Wang and D. E. Feldman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Chenjie Wang and D. E. Feldman The fluctuation theorem establishes general relations between transport coefficients and fluctuations in nonequilibrium systems. Recently there has been much interest in quantum fluctuation relations for electric currents. Since charge carriers also carry spin, it is important to extend the fluctuat… [Phys. Rev. B 92, 064406] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Influence of elastically pinned magnetic domain walls on magnetization reversal in multiferroic heterostructures (2015)

Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Arianna Casiraghi, Teresa Rincón Domínguez, Stefan Rößler, Kévin J. A. Franke, Diego López González, Sampo J. Hämäläinen, Robert Frömter, Hans Peter Oepen, and Sebastiaan van Dijken In elastically coupled multiferroic heterostructures that exhibit full domain correlations between ferroelectric and ferromagnetic subsystems, magnetic domain walls are firmly pinned on top of ferroelectric domain boundaries. In this work, we investigate the influence of pinned magnetic domain walls… [Phys. Rev. B 92, 054406] Published Tue Aug 04, 2015

Schlagwort(e): Magnetism

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Toolbox for continuous-variable entanglement production and measurement using spontaneous parametric down-conversion (2015)

G. Boucher, T. Douce, D. Bresteau, S. P. Walborn, A. Keller, T. Coudreau, S. Ducci, and P. Milman

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): G. Boucher, T. Douce, D. Bresteau, S. P. Walborn, A. Keller, T. Coudreau, S. Ducci, and P. Milman We provide a toolbox for continuous-variable quantum-state engineering and characterization of biphoton states produced by spontaneous parametric down-conversion in a transverse pump configuration. We show that the control of the pump beam's incidence spot and angle corresponds to phase-space displa… [Phys. Rev. A 92, 023804] Published Tue Aug 04, 2015

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

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Giant forward-scattering asymmetry and anomalous tunnel Hall effect at spin-orbit-split and exchange-split interfaces (2015)

T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): T. Huong Dang, H. Jaffrès, T. L. Hoai Nguyen, and H.-J. Drouhin We report on theoretical investigations of scattering asymmetry vs incidence of carriers through exchange barriers and magnetic tunnel junctions made of semiconductors involving spin-orbit interaction. By an analytical 2 × 2 spin model, we show that when Dresselhaus interaction is included in the cond… [Phys. Rev. B 92, 060403(R)] Published Wed Aug 05, 2015

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Intracluster interactions in butterfly {Fe_{3} LnO_{2} } molecules with the non-Kramers ions Tb(III) and Ho(III) (2015)

L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): L. Badía-Romano, J. Rubín, F. Bartolomé, J. Bartolomé, J. Luzón, D. Prodius, C. Turta, V. Mereacre, F. Wilhelm, and A. Rogalev The intracluster exchange interactions within the “butterfly” [ Fe 3 Ln ( μ 3 − O ) 2 ( CCl 3 COO ) 8 ( H 2 O ) ( THF ) 3 ] molecules, where Ln(III) represents a lanthanide cation, have been determined by a combination of x-ray magnetic circular dichroism (XMCD) and vibrating sample magnetometry (VSM) along with an interacti… [Phys. Rev. B 92, 064411] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Surface-termination-dependent magnetism and strong perpendicular magnetocrystalline anisotropy of an FeRh(001) thin film (2015)

Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Soyoung Jekal, S. H. Rhim, S. C. Hong, Won-joon Son, and A. B. Shick The magnetism of FeRh (001) films strongly depends on film thickness and surface terminations. While the magnetic ground state of bulk FeRh is G -type antiferromagnetism, the Rh-terminated films exhibit ferromagnetism with strong perpendicular magnetocrystalline anisotropy whose energy + 2.1 meV/□ is … [Phys. Rev. B 92, 064410] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Control of plasmon fields via irreversible ultrafast dynamics caused by interaction of infrared laser pulses with quantum-dot–metallic-nanoparticle molecules (2015)

S. M. Sadeghi, W. J. Wing, and R. R. Gutha

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): S. M. Sadeghi, W. J. Wing, and R. R. Gutha We study irreversible ultrafast dynamics caused by interaction of a semiconductor quantum-dot–metallic-nanorod system with an infrared laser field. We show that when this system supports exciton-plasmon coupling, by just varying the amplitude of this laser for a short period of time (several nanosec… [Phys. Rev. A 92, 023808] Published Fri Aug 07, 2015

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

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β-detected NMR spin relaxation in a thin film heterostructure of ferromagnetic EuO (2015)

W. A. Mac; Farlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): W. A. MacFarlane, Q. Song, N. J. C. Ingle, K. H. Chow, M. Egilmez, I. Fan, M. D. Hossain, R. F. Kiefl, C. D. P. Levy, G. D. Morris, T. J. Parolin, M. R. Pearson, H. Saadaoui, Z. Salman, and D. Wang We present β -detected NMR measurements of the spin-lattice relaxation of Li + 8 implanted into an epitaxial heterostructure based on a 100 nm thick film of ferromagnetic (FM) EuO as a function of temperature through its FM transition. In the FM state, the spin-lattice relaxation rate follows the same … [Phys. Rev. B 92, 064409] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Rényi entanglement entropy of critical SU(N) spin chains (2015)

Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Jonathan D'Emidio, Matthew S. Block, and Ribhu K. Kaul We present a study of the scaling behavior of the Rényi entanglement entropy (REE) in SU ( N ) spin chain Hamiltonians, in which all of the spins transform under the fundamental representation. These SU ( N ) spin chains are known to be quantum critical and described by a well known Wess-Zumino-Witten (WZ… [Phys. Rev. B 92, 054411] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

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Spin-dependent two-color Kapitza-Dirac effects (2015)

S. McGregor, W. C.-W. Huang, B. A. Shadwick, and H. Batelaan

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): S. McGregor, W. C.-W. Huang, B. A. Shadwick, and H. Batelaan In this paper we present an analysis of the spin behavior of electrons propagating through a laser field. We present an experimentally realizable scenario in which spin-dependent effects of the interaction between the laser and the electrons are dominant. The laser interaction strength and incident … [Phys. Rev. A 92, 023834] Published Tue Aug 18, 2015

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

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Magnetism in tetragonal manganese-rich Heusler compounds (2015)

Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Lukas Wollmann, Stanislav Chadov, Jürgen Kübler, and Claudia Felser A comprehensive study of the total energy of manganese-rich Heusler compounds using density functional theory is presented. Starting from a large set of cubic parent systems, the response to tetragonal distortions is studied in detail. We single out the systems that remain cubic from those that most… [Phys. Rev. B 92, 064417] Published Tue Aug 18, 2015

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Optical event horizons from the collision of a soliton and its own dispersive wave (2015)

S. F. Wang, A. Mussot, M. Conforti, A. Bendahmane, X. L. Zeng, and A. Kudlinski

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): S. F. Wang, A. Mussot, M. Conforti, A. Bendahmane, X. L. Zeng, and A. Kudlinski We observe experimentally the spectral signature of the collision between a soliton and the dispersive wave initially emitted from the soliton itself. This collision, interpreted in terms of an optical event horizon, is controlled by the use of an axially varying fiber which allows us to shape both … [Phys. Rev. A 92, 023837] Published Thu Aug 20, 2015

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

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PT-symmetric invisible defects and confluent Darboux-Crum transformations (2015)

Francisco Correa, Vít Jakubský, and Mikhail S. Plyushchay

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Francisco Correa, Vít Jakubský, and Mikhail S. Plyushchay We show that confluent Darboux-Crum transformations with emergent Jordan states are an effective tool for the design of optical systems governed by the Helmholtz equation under the paraxial approximation. The construction of generic, asymptotically real and periodic, P T -symmetric systems with local … [Phys. Rev. A 92, 023839] Published Thu Aug 20, 2015

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

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Pulse splitting in light propagation through N-type atomic media due to an interplay of Kerr nonlinearity and group-velocity dispersion (2015)

Rajitha K. V., Tarak N. Dey, Jörg Evers, and Martin Kiffner

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Rajitha K. V., Tarak N. Dey, Jörg Evers, and Martin Kiffner We investigate the spatiotemporal evolution of a Gaussian probe pulse propagating through a four-level N -type atomic medium. At two-photon resonance of probe and control fields, weaker probe pulses may propagate through the medium with low absorption and pulse shape distortion. In contrast, we find … [Phys. Rev. A 92, 023840] Published Thu Aug 20, 2015

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

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Giant ferromagnetic π−d interaction in a phthalocyanine molecule (2015)

H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): H. Murakawa, A. Kanda, M. Ikeda, M. Matsuda, and N. Hanasaki We experimentally demonstrate that the ferromagnetic intramolecular π − d interaction works between an itinerant π -electron spin and a localized d -electron's magnetic moment in the iron-phthalocyanine (Pc) molecular compound. The evaluation of the hidden π − d coupling is achieved by preparing the isola… [Phys. Rev. B 92, 054429] Published Fri Aug 21, 2015

Schlagwort(e): Magnetism

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Pressure-induced commensurate phase with potential giant polarization in YMn_{2} O_{5} (2015)

M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): M. Deutsch, T. C. Hansen, M. T. Fernandez-Diaz, A. Forget, D. Colson, F. Porcher, and I. Mirebeau We have studied multiferroic YMn 2 O 5 by high-pressure neutron diffraction in a large pressure range from 0.5 to 6.3 GPa. We observe a pressure-induced commensurate (PCM) phase with a propagation vector 1 2 0 1 2 that is different from those observed at ambient pressure. It coexists with the ambient press… [Phys. Rev. B 92, 060410(R)] Published Fri Aug 21, 2015

Schlagwort(e): Magnetism

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Spin current generation and magnetic response in carbon nanotubes by the twisting phonon mode (2015)

Masato Hamada, Takehito Yokoyama, and Shuichi Murakami

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Masato Hamada, Takehito Yokoyama, and Shuichi Murakami We theoretically investigate spin current and magnetic response induced by the twisting phonon mode in carbon nanotubes via the spin-rotation coupling. An effective magnetic field due to the twisting mode induces both spin and orbital magnetizations. The induced spin and orbital magnetizations have … [Phys. Rev. B 92, 060409(R)] Published Fri Aug 21, 2015

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Three-photon resonance and adiabatic passage in the large-detuning Rabi model (2015)

Ken K. W. Ma and C. K. Law

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-22

Beschreibung: Author(s): Ken K. W. Ma and C. K. Law We investigate theoretically the quantum Rabi model in the large-detuning regime. When the frequency of the cavity field is near one-third of the atomic transition frequency, we show that there exists a resonant three-photon coupling via intermediate states connected by counter-rotating processes. W… [Phys. Rev. A 92, 023842] Published Fri Aug 21, 2015

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

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Radiation torques exerted on a sphere by focused Laguerre-Gaussian beams (2015)

Huachao Yu and Weilong She

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Huachao Yu and Weilong She Radiation torques exerted by focused Laguerre-Gaussian beams on a microsphere are investigated with the generalized Lorenz-Mie theory. It is shown that the spin and orbital torques, in particular, those exerted by circularly polarized beams, can be far larger than the net torque in magnitude, which … [Phys. Rev. A 92, 023844] Published Mon Aug 24, 2015

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

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Transmission through correlated Cu_{n} CoCu_{n} heterostructures (2015)

L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): L. Chioncel, C. Morari, A. Östlin, W. H. Appelt, A. Droghetti, M. M. Radonjić, I. Rungger, L. Vitos, U. Eckern, and A. V. Postnikov We propose a method to compute the transmission through correlated heterostructures by combining density functional and many-body dynamical mean field theories. The heart of this combination consists in porting the many-body self-energy from an all electron basis into a pseudopotential localized ato… [Phys. Rev. B 92, 054431] Published Mon Aug 24, 2015

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Single-cycle coherent terahertz-pulse propagation in rigid-rotor molecular media (2015)

Robert Marskar and Ulf L. Österberg

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Robert Marskar and Ulf L. Österberg We theoretically analyze linear and nonlinear coherent propagation of linearly polarized, plane-wave, resonant single-cycle terahertz pulses through spatially extended rigid-rotor molecular media. Our model incorporates mixed state medium preparation, nonperturbative nonlinearities, saturation, cohe… [Phys. Rev. A 92, 023843] Published Mon Aug 24, 2015

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

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SU(1,1)-type light-atom-correlated interferometer (2015)

Hongmei Ma, Dong Li, Chun-Hua Yuan, L. Q. Chen, Z. Y. Ou, and Weiping Zhang

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Hongmei Ma, Dong Li, Chun-Hua Yuan, L. Q. Chen, Z. Y. Ou, and Weiping Zhang The quantum correlation of light and atomic collective excitation can be used to compose an SU(1,1)-type hybrid light-atom interferometer, where one arm in the optical SU(1,1) interferometer is replaced by the atomic collective excitation. The phase-sensing probes include not only the photon field b… [Phys. Rev. A 92, 023847] Published Mon Aug 24, 2015

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

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Bose-Hubbard ladder subject to effective magnetic field: Quench dynamics in a harmonic trap (2015)

Wladimir Tschischik, Roderich Moessner, and Masudul Haque

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Wladimir Tschischik, Roderich Moessner, and Masudul Haque Motivated by a recent experiment with optical lattices that has realized a ladder geometry with an effective magnetic field [Atala et al. , Nat. Phys. 10 , 588 (2014) ], we study the dynamics of bosons on a tight-binding two-leg ladder with complex hopping amplitudes. This system displays a quantum ph… [Phys. Rev. A 92, 023845] Published Mon Aug 24, 2015

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Universal scaling for a quantum discontinuity critical point and quantum quenches (2015)

Sei Suzuki and Amit Dutta

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Sei Suzuki and Amit Dutta We introduce the notion of a quantum version of a discontinuity critical point (DCP) in the context of a first-order quantum phase transition referred to as a quantum DCP (QDCP). We evaluate the critical exponents associated with such a QDCP using the appropriate scaling relations focusing mainly on… [Phys. Rev. B 92, 064419] Published Mon Aug 24, 2015

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Tunable fast and slow light in a hybrid optomechanical system (2015)

M. Javed Akram, M. Miskeen Khan, and Farhan Saif

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): M. Javed Akram, M. Miskeen Khan, and Farhan Saif We explain the probe field transmission spectrum under the influence of a strong pump field in a hybrid optomechanical system, composed of an optical cavity, a mechanical resonator, and a two-level atom. We show fast (superluminal) and slow (subluminal) light effects of the transmitted probe field i… [Phys. Rev. A 92, 023846] Published Mon Aug 24, 2015

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Electronic and magnetic effects of a stacking fault in cobalt nanoscale islands on the Ag(111) surface (2015)

Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Keiji Doi, Emi Minamitani, Shunji Yamamoto, Ryuichi Arafune, Yasuo Yoshida, Satoshi Watanabe, and Yukio Hasegawa By utilizing spin-polarized scanning tunneling microscopy (STM) and spectroscopy, we observe the coexistence of perpendicularly and in-plane magnetized cobalt nanoscale islands on an Ag(111) surface. The magnetization direction has the relationship with the observed moiré-corrugation amplitude on th… [Phys. Rev. B 92, 064421] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Shape-dependent exchange bias effect in magnetic nanoparticles with core-shell morphology (2015)

V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): V. Dimitriadis, D. Kechrakos, O. Chubykalo-Fesenko, and V. Tsiantos We study the low-temperature isothermal magnetic hysteresis of cubical and spherical nanoparticles with ferromagnetic-core/antiferromagnetic-shell morphology, in order to elucidate the sensitivity of the exchange bias effect to the shape of the particles and the structural imperfections at the core-… [Phys. Rev. B 92, 064420] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Perturbative unidirectional invisibility (2015)

Ali Mostafazadeh

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Ali Mostafazadeh We outline a general perturbative method of evaluating scattering features of finite-range complex potentials and use it to examine complex perturbations of a rectangular barrier potential. In optics, these correspond to modulated refractive index profiles of the form n ( x ) = n 0 + f ( x ) , where n 0 is real,… [Phys. Rev. A 92, 023831] Published Tue Aug 18, 2015

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

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Nonclassical polarization dynamics in classical-like states (2015)

Alfredo Luis and Ángel S. Sanz

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Alfredo Luis and Ángel S. Sanz Quantum polarization is investigated by means of a trajectory picture based on the Bohmian formulation of quantum mechanics. Relevant examples of classical-like two-mode field states are thus examined, namely, Glauber and SU(2) coherent states. Although these states are often regarded as classical, … [Phys. Rev. A 92, 023832] Published Tue Aug 18, 2015

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

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Measuring the nonseparability of vector vortex beams (2015)

Melanie McLaren, Thomas Konrad, and Andrew Forbes

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-19

Beschreibung: Author(s): Melanie McLaren, Thomas Konrad, and Andrew Forbes Vector beams have the defining property of nonseparable spatial and polarization degrees of freedom and are now routinely generated in the laboratory and used in a myriad of applications. Here we exploit the nonseparability of such beams, akin to entanglement of quantum states, to apply tools tradit… [Phys. Rev. A 92, 023833] Published Tue Aug 18, 2015

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

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Tunable multiple Fano resonances in magnetic single-layered core-shell particles (2015)

Tiago J. Arruda, Alexandre S. Martinez, and Felipe A. Pinheiro

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-20

Beschreibung: Author(s): Tiago J. Arruda, Alexandre S. Martinez, and Felipe A. Pinheiro We investigate multiple Fano, comblike scattering resonances in single-layered, concentric core-shell nanoparticles composed of magnetic materials. Using the Lorenz-Mie theory, we derive, in the long-wavelength limit, an analytical condition for the occurrence of comblike resonances in the single sc… [Phys. Rev. A 92, 023835] Published Wed Aug 19, 2015

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

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Unconventional photon blockade with second-order nonlinearity (2015)

Y. H. Zhou, H. Z. Shen, and X. X. Yi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-21

Beschreibung: Author(s): Y. H. Zhou, H. Z. Shen, and X. X. Yi The photon blockade based on weak nonlinearities is called the unconventional photon blockade. The study of the unconventional photon blockade in recent decades has mainly focused on the χ ( 3 ) Kerr nonlinearity. In this paper, we study the photon blockade in two weakly coupled nonlinear cavities via … [Phys. Rev. A 92, 023838] Published Thu Aug 20, 2015

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

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Measuring acoustic mode resonance alone as a sensitive technique to extract antiferromagnetic coupling strength (2015)

Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-25

Beschreibung: Author(s): Yajun Wei, Peter Svedlindh, Mikhail Kostylev, Mojtaba Ranjbar, Randy K. Dumas, and Johan Åkerman We have studied static and dynamic magnetic properties of a general asymmetric trilayer system using numerical simulations. For ferromagnetic, 90 ∘ , and antiferromagnetic coupling, the magnetizations of the two magnetic layers exhibit one, two, and three phases with increasing external field, respect… [Phys. Rev. B 92, 064418] Published Mon Aug 24, 2015

Schlagwort(e): Magnetism

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Precision measurement of a low-loss cylindrical dumbbell-shaped sapphire mechanical oscillator using radiation pressure (2015)

J. Bourhill, E. Ivanov, and M. E. Tobar

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): J. Bourhill, E. Ivanov, and M. E. Tobar We present first results from a number of experiments conducted on a 0.53-kg cylindrical dumbbell-shaped sapphire crystal. Here we report on an optomechanical experiment utilizing a modification to the typical cylindrical architecture. Mechanical motion of the crystal structure alters the dimensions… [Phys. Rev. A 92, 023817] Published Tue Aug 11, 2015

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

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Subharmonic transitions and Bloch-Siegert shift in electrically driven spin resonance (2015)

Judit Romhányi, Guido Burkard, and András Pályi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Judit Romhányi, Guido Burkard, and András Pályi We theoretically study coherent subharmonic (multiphoton) transitions of a harmonically driven spin. We consider two cases: magnetic resonance (MR) with a misaligned, i.e., nontransversal, driving field, and electrically driven spin resonance (EDSR) of an electron confined in a one-dimensional, para… [Phys. Rev. B 92, 054422] Published Tue Aug 11, 2015

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Spin-wave dynamics in permalloy/cobalt magnonic crystals in the presence of a nonmagnetic spacer (2015)

P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): P. Malagò, L. Giovannini, R. Zivieri, P. Gruszecki, and M. Krawczyk In this paper, we theoretically study the influence of a nonmagnetic spacer between ferromagnetic dots and a ferromagnetic matrix on the frequency dispersion of the spin-wave excitations in two-dimensional bicomponent magnonic crystals. By means of the dynamical matrix method we investigate structur… [Phys. Rev. B 92, 064416] Published Wed Aug 12, 2015

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Direct and inverse spin-orbit torques (2015)

Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Frank Freimuth, Stefan Blügel, and Yuriy Mokrousov The connection between the spin-orbit torque (SOT) and inverse spin-orbit torque (ISOT) in systems without inversion symmetry is studied by combining phenomenological models, diffusion theory, and density functional theory. Using this, DFT calculations on Co/Pt(111) magnetic bilayers expose the mechanisms underlying SOT and ISOT and highlight their reciprocity on the microscopic level. [Phys. Rev. B 92, 064415] Published Wed Aug 12, 2015

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Quantum noise of free-carrier dispersion in semiconductor optical cavities (2015)

Ryan Hamerly and Hideo Mabuchi

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Ryan Hamerly and Hideo Mabuchi This paper derives Langevin equations for an optical cavity where the dominant nonlinearity arises from free-carrier dispersion. We define a generalized Wigner function, compute a Fokker-Planck equation that approximates the master equation, and convert this to a system of stochastic differential eq… [Phys. Rev. A 92, 023819] Published Wed Aug 12, 2015

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

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Solitons in a nonlinear Schrödinger equation with PT-symmetric potentials and inhomogeneous nonlinearity: Stability and excitation of nonlinear modes (2015)

Zhenya Yan, Zichao Wen, and Vladimir V. Konotop

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Zhenya Yan, Zichao Wen, and Vladimir V. Konotop We report branches of explicit expressions for nonlinear modes in parity-time ( PT ) -symmetric potentials of several types. For the single-well and double-well potentials the found solutions are two-parametric and appear to be stable even when the PT symmetry of respective underlying linear models is … [Phys. Rev. A 92, 023821] Published Thu Aug 13, 2015

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Gapless chiral spin liquid in a kagome Heisenberg model (2015)

Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Samuel Bieri, Laura Messio, Bernard Bernu, and Claire Lhuillier Motivated by recent experiments on the Heisenberg S = 1 / 2 quantum spin liquid candidate material kapellasite, we classify all possible chiral (time-reversal symmetry breaking) spin liquids with fermionic spinons on the kagome lattice. We obtain the phase diagram for the physically relevant extended He… [Phys. Rev. B 92, 060407(R)] Published Fri Aug 14, 2015

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Effect of structure on the magnetic anisotropy of L1_{0} FePt nanoparticles (2015)

Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Alamgir Kabir, Jun Hu, Volodymyr Turkowski, Ruqian Wu, Robert Camley, and Talat S. Rahman We carry out a systematic theoretical investigation of magnetocrystalline anisotropy (MCA) of L 1 0 FePt clusters with alternating Fe and Pt planes along the (001) direction. The clusters studied contain 30–484 atoms. We calculate the structural relaxation and magnetic moment of each cluster by using … [Phys. Rev. B 92, 054424] Published Thu Aug 13, 2015

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Curvilinear optical forces (2015)

Andrey Novitsky

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Andrey Novitsky Accelerating a light beam makes a particle move along a curvilinear trajectory. We show that the curvature of the trajectory causes a special kind of nonconservative force, which is called a curvilinear force. We obtain the expression for this force acting on a spherical particle in the Rayleigh app… [Phys. Rev. A 92, 023823] Published Fri Aug 14, 2015

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Magnetization of a quantum spin system induced by a linear polarized laser (2015)

A. A. Zvyagin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): A. A. Zvyagin It is shown that a linear polarized laser can cause magnetization of a spin system with magnetic anisotropy, the distinguished axis of which is perpendicular to the polarization of the laser field. In the dynamical regime the magnetization oscillates around the nonzero value determined by the parame… [Phys. Rev. B 92, 054405] Published Tue Aug 04, 2015

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Relative strength of thermal and electrical spin currents in a ferromagnetic tunnel contact on a semiconductor (2015)

K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): K.-R. Jeon, H. Saito, S. Yuasa, and R. Jansen The relative magnitude of electrical and thermal spin currents is investigated for a ferromagnetic tunnel contact on a semiconductor. A direct quantitative comparison is made by simultaneously generating electrical and thermal spin currents of opposite sign and determining the compensation point at … [Phys. Rev. B 92, 054403] Published Tue Aug 04, 2015

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Observation of pure inverse spin Hall effect in ferromagnetic metals via ferromagnetic/antiferromagnetic exchange-bias structures (2015)

H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): H. Wu, C. H. Wan, Z. H. Yuan, X. Zhang, J. Jiang, Q. T. Zhang, Z. C. Wen, and X. F. Han We report that the spin current generated by the spin Seebeck effect (SSE) in yttrium iron garnet (YIG) can be detected by a ferromagnetic metal (NiFe). By using the ferromagnetic/antiferromagnetic (FM/AFM) exchange bias structure (NiFe/IrMn), the inverse spin Hall effect (ISHE) and planar Nernst ef… [Phys. Rev. B 92, 054404] Published Tue Aug 04, 2015

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Single-photon transport through an atomic chain coupled to a one-dimensional nanophotonic waveguide (2015)

Zeyang Liao, Xiaodong Zeng, Shi-Yao Zhu, and M. Suhail Zubairy

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Zeyang Liao, Xiaodong Zeng, Shi-Yao Zhu, and M. Suhail Zubairy We study the dynamics of a single-photon pulse traveling through a linear atomic chain coupled to a one-dimensional (1D) single mode photonic waveguide. We derive a time-dependent dynamical theory for this collective many-body system which allows us to study the real time evolution of the photon tra… [Phys. Rev. A 92, 023806] Published Wed Aug 05, 2015

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

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Quantum noise of a white-light cavity using a double-pumped gain medium (2015)

Yiqiu Ma, Haixing Miao, Chunnong Zhao, and Yanbei Chen

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Yiqiu Ma, Haixing Miao, Chunnong Zhao, and Yanbei Chen Laser interferometric gravitational-wave detectors implement Fabry-Pérot cavities to increase their peak sensitivity. However, this is at the cost of reducing their detection bandwidth, which originates from the propagation phase delay of the light. The “white-light-cavity” idea, first proposed by W… [Phys. Rev. A 92, 023807] Published Wed Aug 05, 2015

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

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Spin dynamics in pressure-induced magnetically ordered phases in (C_{4} H_{12} N_{2} )Cu_{2} Cl_{6} (2015)

G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): G. Perren, J. S. Möller, D. Hüvonen, A. A. Podlesnyak, and A. Zheludev Organic molecular magnets like piperazinium hexachlorodicuprate (PHCC) have attracted interest due to their sensitivity to pressure which presents possibilities for pressure-induced quantum phase transitions. Previous neutron and muon studies of PHCC gave differing indications of how the spin gap in this material varied with applied pressure. The authors of this work have resolved this discrepancy by further neutron scattering results showing that the spin gap has dissipated completely by 9 kbar, in agreement with the previous muon data. The authors also present a model in which the results are explained by the weakening of a single exchange pathway. [Phys. Rev. B 92, 054413] Published Fri Aug 07, 2015

Schlagwort(e): Magnetism

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Blackbody aperture radiation: Effect of cavity wall (2015)

Kasimir Blomstedt, Tero Setälä, and Ari T. Friberg

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Kasimir Blomstedt, Tero Setälä, and Ari T. Friberg In this paper we show that the coherence properties of the radiation emanating from an aperture in the single wall of a half-space blackbody cavity can be determined by considering how free-space blackbody radiation is scattered by those apertures. That is, although the presence of the cavity wall m... [Phys. Rev. A 91, 063805] Published Thu Jun 04, 2015

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

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Coherent destruction of tunneling in a lattice array with a controllable boundary (2015)

Liping Li, Xiaobing Luo, Xin-You Lü, Xiaoxue Yang, and Ying Wu

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Liping Li, Xiaobing Luo, Xin-You Lü, Xiaoxue Yang, and Ying Wu We have investigated how the dynamics of a quantum particle initially localized in the left boundary site under periodic driving can be manipulated via control of the right boundary site of a lattice array. Because of the adjustable coupling between the right boundary site and its nearest neighbor, ... [Phys. Rev. A 91, 063804] Published Wed Jun 03, 2015

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

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Geometrical effects in orbital magnetic susceptibility (2015)

Yang Gao, Shengyuan A. Yang, and Qian Niu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Yang Gao, Shengyuan A. Yang, and Qian Niu Within the wave-packet semiclassical approach, the Bloch electron energy is derived to second order in the magnetic field and classified into gauge-invariant terms with clear physical meaning, yielding a fresh understanding of the complex behavior of orbital magnetic susceptibility. The Berry curvat... [Phys. Rev. B 91, 214405] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Stimulated thermalization of a parametrically driven magnon gas as a prerequisite for Bose-Einstein magnon condensation (2015)

P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): P. Clausen, D. A. Bozhko, V. I. Vasyuchka, B. Hillebrands, G. A. Melkov, and A. A. Serga Thermalization of a parametrically driven magnon gas leading to the formation of a Bose-Einstein condensate at the bottom of a spin-wave spectrum was studied by time- and wave-vector-resolved Brillouin light scattering spectroscopy. It has been found that the condensation is preceded by the conversi... [Phys. Rev. B 91, 220402(R)] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Direct observation of noncollinear order of Co and Mn moments in multiferroic Mn_{0.85}Co_{0.15}WO_{4} (2015)

J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. Herrero-Martín, A. N. Dobrynin, C. Mazzoli, P. Steadman, P. Bencok, R. Fan, A. A. Mukhin, V. Skumryev, and J. L. García-Muñoz Doping M n 1 − x C o x W O 4 with Co produces a rich magnetic phase diagram with a large number of ferroelectric phases. We present resonant x-ray magnetic scattering experiments in the known collinear AF4 phase of multiferroic M n 0.85 C o 0.15 W O 4 showing that Mn and Co spins point to different directions despite... [Phys. Rev. B 91, 220403(R)] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Quasi-two-dimensional spin and phonon excitations in La_{1.965}Ba_{0.035}CuO_{4} (2015)

J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): J. J. Wagman, D. Parshall, M. B. Stone, A. T. Savici, Y. Zhao, H. A. Dabkowska, and B. D. Gaulin We present time-of-flight inelastic neutron scattering measurements of La 1.965 Ba 0.035 CuO 4 (LBCO), a lightly doped member of the high temperature superconducting La-based cuprate family. By using time-of-flight neutron instrumentation coupled with single crystal sample rotation we obtain a four-dimen... [Phys. Rev. B 91, 224404] Published Wed Jun 03, 2015

Schlagwort(e): Magnetism

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Magnetic spin-flop transition and interlayer spin-wave dispersion in PrCaFeO_{4} revealed by neutron diffraction and inelastic neutron scattering (2015)

N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): N. Qureshi, M. Valldor, L. Weber, A. Senyshyn, Y. Sidis, and M. Braden We present a comprehensive study on PrCaFeO 4 using macroscopic methods, neutron and x-ray diffraction, as well as inelastic neutron scattering. One polycrystalline and two single-crystal samples were investigated exhibiting structural phase transitions from a high-temperature tetragonal phase to an ... [Phys. Rev. B 91, 224402] Published Tue Jun 02, 2015

Schlagwort(e): Magnetism

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Magnetic phase diagram of the coupled triangular spin tubes for CsCrF_{4} (2015)

Kouichi Seki and Kouichi Okunishi

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-06-06

Beschreibung: Author(s): Kouichi Seki and Kouichi Okunishi Using Monte Carlo simulations, we explore the magnetic phase diagram of triangular spin tubes coupled with a ferromagnetic intertube interaction for CsCrF 4 . The planar structure of the coupled tubes is topologically equivalent to the kagome-triangular lattice, which induces nontrivial frustration ef... [Phys. Rev. B 91, 224403] Published Tue Jun 02, 2015

Schlagwort(e): Magnetism

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Inverse spin Hall effect in Cr: Independence of antiferromagnetic ordering (2015)

D. Qu, S. Y. Huang, and C. L. Chien

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-07-30

Beschreibung: Author(s): D. Qu, S. Y. Huang, and C. L. Chien Chromium is a 3 d spin-density wave antiferromagnetic (AF) metal with a Néel temperature of 311 K. By using the thermal spin injection method, we have observed a large inverse spin Hall voltage in Cr. With a negligible magnetic proximity effect and a large spin Hall angle, Cr is an intrinsic pure spi… [Phys. Rev. B 92, 020418(R)] Published Wed Jul 29, 2015

Schlagwort(e): Magnetism

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Nonlinear Gamow vectors, shock waves, and irreversibility in optically nonlocal media (2015)

Silvia Gentilini, Maria Chiara Braidotti, Giulia Marcucci, Eugenio Del; Re, and Claudio Conti

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Silvia Gentilini, Maria Chiara Braidotti, Giulia Marcucci, Eugenio DelRe, and Claudio Conti Gamow vectors are used to study nonlinear wave dynamics, and it is found that the quantization of the decay rates described by these vectors successfully explains the irreversibility of dispersive shock waves. [Phys. Rev. A 92, 023801] Published Mon Aug 03, 2015

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

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Thickness-dependent magnetic properties and strain-induced orbital magnetic moment in SrRuO_{3} thin films (2015)

K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): K. Ishigami, K. Yoshimatsu, D. Toyota, M. Takizawa, T. Yoshida, G. Shibata, T. Harano, Y. Takahashi, T. Kadono, V. K. Verma, V. R. Singh, Y. Takeda, T. Okane, Y. Saitoh, H. Yamagami, T. Koide, M. Oshima, H. Kumigashira, and A. Fujimori Thin films of the ferromagnetic metal SrRuO 3 (SRO) show a varying easy magnetization axis depending on the epitaxial strain, and undergo a metal-to-insulator transition with decreasing film thickness. We have investigated the magnetic properties of SRO thin films with varying thicknesses fabricated … [Phys. Rev. B 92, 064402] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Ultrafast magnetization dynamics: Microscopic electronic configurations and ultrafast spectroscopy (2015)

I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): I. L. M. Locht, I. Di Marco, S. Garnerone, A. Delin, and M. Battiato We provide an approach for the identification of the electronic and magnetic configurations of ferromagnetic Fe after an ultrafast decrease or increase of the magnetization. The model is based on the well-grounded assumption that, after an ultrafast variation of the magnetization, the system achieve… [Phys. Rev. B 92, 064403] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Thermal vector potential theory of magnon-driven magnetization dynamics (2015)

Gen Tatara

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): Gen Tatara Thermal vector potential formulation is applied to study the thermal dynamics of magnetic structures for insulating ferromagnets. By separating the variables of the magnetic structure and the magnons, the equation of motion for the structure, including spin-transfer effect because of thermal magnons… [Phys. Rev. B 92, 064405] Published Mon Aug 03, 2015

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Axially and radially quantized spin waves in thick permalloy nanodots (2015)

X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-04

Beschreibung: Author(s): X. Zhou, D. Kumar, I. S. Maksymov, M. Kostylev, and A. O. Adeyeye We have investigated the spin wave modes in perpendicularly magnetized permalloy nanodots as a function of film thickness using field modulated perpendicular ferromagnetic resonance spectroscopy. We observed mode intensity inversion with an increase in dot thickness. In thicker dots, one ellusive an… [Phys. Rev. B 92, 054401] Published Mon Aug 03, 2015

Schlagwort(e): Magnetism

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Ferrimagnetic resonance and magnetoelastic excitations in magnetoelectric hexaferrites (2015)

Carmine Vittoria

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Carmine Vittoria Static field properties of magnetoelectric hexaferrites have been explored extensively in the past five years. In this paper, dynamic properties of magnetoelectric hexaferrites are being explored. In particular, effects of the linear magnetoelectric coupling ( α ) on ferrimagnetic resonance (FMR) and … [Phys. Rev. B 92, 064407] Published Tue Aug 04, 2015

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Accurate calculation of the transverse anisotropy of a magnetic domain wall in perpendicularly magnetized multilayers (2015)

Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): Felix Büttner, Benjamin Krüger, Stefan Eisebitt, and Mathias Kläui Bloch domain walls are the most common type of transition between two out-of-plane magnetized domains (one magnetized upwards, one downwards) in films with perpendicular magnetic anisotropy. The rotation of the spins of such domain walls in the plane of the film requires energy, which is described b… [Phys. Rev. B 92, 054408] Published Wed Aug 05, 2015

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Collective behavior of Cr^{3+} ions in ruby revealed by whispering gallery modes (2015)

Jeremy Bourhill, Maxim Goryachev, Warrick G. Farr, and Michael E. Tobar

American Physical Society (APS)

In: Physical Review A

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Beschreibung: Author(s): Jeremy Bourhill, Maxim Goryachev, Warrick G. Farr, and Michael E. Tobar We present evidence for the collective action of Cr 3 + ion impurities in a highly concentrated ruby crystal coupled to microwave whispering gallery modes (WGMs). The cylindrical geometry of the crystal allows the creation of superradiant or “spin-mode” doublets, with spatial structures similar to tha… [Phys. Rev. A 92, 023805] Published Tue Aug 04, 2015

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

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Magnetic model in multiferroic NdFe_{3} (BO_{3} )_{4} investigated by inelastic neutron scattering (2015)

S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-06

Beschreibung: Author(s): S. Hayashida, M. Soda, S. Itoh, T. Yokoo, K. Ohgushi, D. Kawana, H. M. Rønnow, and T. Masuda We performed inelastic neutron scattering measurements on single crystals of NdFe 3 ( BO 3 11 ) 4 to explore the magnetic excitations, to establish the underlying Hamiltonian, and to reveal the detailed nature of hybridization between the 4 f and 3 d magnetism. The observed spectra exhibiting a couple of key… [Phys. Rev. B 92, 054402] Published Tue Aug 04, 2015

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Multiscale modeling of ultrafast element-specific magnetization dynamics of ferromagnetic alloys (2015)

D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): D. Hinzke, U. Atxitia, K. Carva, P. Nieves, O. Chubykalo-Fesenko, P. M. Oppeneer, and U. Nowak A hierarchical multiscale approach to model the magnetization dynamics of ferromagnetic random alloys is presented. First-principles calculations of the Heisenberg exchange integrals are linked to atomistic spin models based upon the stochastic Landau-Lifshitz-Gilbert (LLG) equation to calculate tem… [Phys. Rev. B 92, 054412] Published Thu Aug 06, 2015

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Topological orders with global gauge anomalies (2015)

Yi-Zhuang You and Cenke Xu

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): Yi-Zhuang You and Cenke Xu By definition, the physics of the d -dimensional (dim) boundary of a ( d + 1 ) -dim symmetry protected topological (SPT) state cannot be realized as itself on a d -dim lattice. If the symmetry of the system is unitary, then a formal way to determine whether a d -dim theory must be a boundary or not, is to c… [Phys. Rev. B 92, 054410] Published Thu Aug 06, 2015

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Neutron-scattering-based evidence for interacting magnetic excitons in LaCoO_{3} (2015)

S. El-Khatib, D. Phelan, J. G. Barker, H. Zheng, J. F. Mitchell, and C. Leighton

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-08

Beschreibung: Author(s): S. El-Khatib, D. Phelan, J. G. Barker, H. Zheng, J. F. Mitchell, and C. Leighton For several decades LaCoO 3 attracted interest due the unconventional thermally-driven spin-state crossover from a nonmagnetic to paramagnetic state. More recently, it was realized that the “nonmagnetic” ground state harbors some form of magnetism that is likely due to local magnetic entities forming at oxygen vacancies. Such entities dubbed “magnetic excitons” were predicted in 1996, with some evidence for their existence emerging around 2005 from muon spin relaxation. In this Rapid Communication the authors provide the first scattering-based evidence for spin excitons, direct information on the size and density of the excitons, as well as their interactions. The form of the scattering is also direct proof of a bulk 3D ensemble of these excitons. [Phys. Rev. B 92, 060404(R)] Published Thu Aug 06, 2015

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Linear antiferrodistortive-antiferromagnetic effect in multiferroics: Physical manifestations (2015)

Anna N. Morozovska, Victoria V. Khist, Maya D. Glinchuk, Venkatraman Gopalan, and Eugene A. Eliseev

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Anna N. Morozovska, Victoria V. Khist, Maya D. Glinchuk, Venkatraman Gopalan, and Eugene A. Eliseev Using the theory of symmetry and the microscopic model we predict the possibility of a linear antiferrodistortive-antiferromagnetic effect in the perovskites with structural antiferrodistortive and antiferromagnetic long-range ordering and find the necessary conditions of its occurrence. The main ph… [Phys. Rev. B 92, 054421] Published Tue Aug 11, 2015

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Low dimensionalization of magnetic ordering in Sr_{2} VO_{4} by hydride ion substitution (2015)

Joonho Bang, Satoru Matsuishi, Sachiko Maki, Jun-ichi Yamaura, Masatoshi Hiraishi, Soshi Takeshita, Ichihiro Yamauchi, Kenji M. Kojima, and Hideo Hosono

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-12

Beschreibung: Author(s): Joonho Bang, Satoru Matsuishi, Sachiko Maki, Jun-ichi Yamaura, Masatoshi Hiraishi, Soshi Takeshita, Ichihiro Yamauchi, Kenji M. Kojima, and Hideo Hosono Substitution of an oxygen anion with a hydrogen anion induced the low dimensionalization of magnetic ordering in a transition metal oxide S r 2 V O 4 . Upon increasing x up to ∼ 1 in S r 2 V O 4 − x H x , the hydride ions were ordered linearly, and the magnetic susceptibility was simultaneously suppressed. It was fo… [Phys. Rev. B 92, 064414] Published Tue Aug 11, 2015

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Quantum entanglement in the one-dimensional spin-orbital SU(2)⊗XXZ model (2015)

Wen-Long You, Peter Horsch, and Andrzej M. Oleś

American Physical Society (APS)

In: Physical Review B

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): Wen-Long You, Peter Horsch, and Andrzej M. Oleś We investigate the phase diagram and the spin-orbital entanglement of a one-dimensional SU ( 2 ) ⊗ XXZ model with SU(2) spin exchange and anisotropic XXZ orbital exchange interactions and negative exchange coupling constant. As a unique feature, the spin-orbital entanglement entropy in the entangled grou… [Phys. Rev. B 92, 054423] Published Wed Aug 12, 2015

Schlagwort(e): Magnetism

Print ISSN: 1098-0121

Digitale ISSN: 1095-3795

Thema: Physik

Publiziert von American Physical Society (APS)

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Gamma-ray laser based on the collective decay of positronium atoms in a Bose-Einstein condensate (2015)

H. K. Avetissian, A. K. Avetissian, and G. F. Mkrtchian

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-13

Beschreibung: Author(s): H. K. Avetissian, A. K. Avetissian, and G. F. Mkrtchian We consider, in general, the collective two-photon annihilation decay of positronium atoms arising from the second quantized formalism. It is shown that two-photon annihilation of positronium atoms in a Bose-Einstein condensate (BEC) is unstable. Due to the BEC coherence, an absolute instability in … [Phys. Rev. A 92, 023820] Published Wed Aug 12, 2015

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

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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Violation of Bell's inequality for phase-singular beams (2015)

Shashi Prabhakar, Salla Gangi Reddy, A. Aadhi, Chithrabhanu Perumangatt, G. K. Samanta, and R. P. Singh

American Physical Society (APS)

In: Physical Review A

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Publikationsdatum: 2015-08-15

Beschreibung: Author(s): Shashi Prabhakar, Salla Gangi Reddy, A. Aadhi, Chithrabhanu Perumangatt, G. K. Samanta, and R. P. Singh We have considered optical beams with phase singularity and experimentally verified that these beams, although classical, have properties of two-mode entanglement in quantum states. We have observed the violation of Bell's inequality for continuous variables using the Wigner distribution function (W… [Phys. Rev. A 92, 023822] Published Fri Aug 14, 2015

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

Print ISSN: 1050-2947

Digitale ISSN: 1094-1622

Thema: Physik

Publiziert von American Physical Society (APS)

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