Strongly correlated fermions on frustrated lattices. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, TT 14.7
Conformational disorder of conjugated polymers. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, SYOE 8.106
Vertically and relaxed excited state properties of neutral and charged oligofluorenses with and without keto-defect. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, SYOE 8.107
Coupling phenomena of surface plasmons. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, HL 33.3
Anisotropy and interlayer exchange coupling in thin magnetic films: beyond the Landau-Lifshitz evaluation of spin wave spectra. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, MA 26.1
Classical transport on lattices with frustrated interactions. - In: 71st annual meeting of the DPG and spring meeting of the Condensed Matter Division and the sections: Biological Physics, Environmental Physics, Extraterrestrial Physics, History of Physics, Physics Education, Radiation and Medical Physics as well as the working groups: Energy Matters, Equal Opportunities, Industry and Economy, Information, Physics and Disarmament, Physics of Socio-Economic Systems, 2007, TT 33.4
Coherent exciton-surface plasmon polariton interactions in hybrid metal semiconductor nanostructures. - In: International Workshop on Physics of Semiconductor Devices, 2007, ISBN 978-1-4244-1728-5, (2007), insges. 3 S.
http://dx.doi.org/10.1109/IWPSD.2007.4472531
Mechanism of temperature dependence of the magnetic anisotropy energy in ultrathin Cobalt and Nickel films. - In: Journal of magnetism and magnetic materials, ISSN 1873-4766, Bd. 316.2007, 2, e86-e89
Temperature dependent FMR-measurements of Ni and Co films are analysed using a microscopic theory for ultrathin metallic systems. The mechanism governing the temperature dependence of the magnetic anisotropy energy is identified and discussed. It is reduced with increasing temperature. This behavior is found to be solely caused by magnon excitations.
http://dx.doi.org/10.1016/j.jmmm.2007.02.134
Green function theory versus quantum Monte Carlo calculations for thin magnetic films. - In: Physical review. Condensed matter and materials physics / American Physical Society. - College Park, Md. : APS, 1970-2015 , ISSN: 1550-235X , ZDB-ID: 1473011-X, ISSN 1550-235X, Bd. 75 (2007), 21, S. 214401, insges. 8 S.
In this work we compare numerically exact quantum Monte Carlo QMC calculations and Green function theory GFT calculations of thin ferromagnetic films including second-order anisotropies. Thereby, we concentrate on easy-plane systems, i.e., systems for which the anisotropy favors a magnetization parallel to the film plane. We discuss these systems in perpendicular external field, i.e., B parallel to the film normal. GFT results are in good agreement with QMC for high enough fields and temperatures. Below a critical field or a critical temperature, no collinear stable magnetization exists in GFT. On the other hand, QMC gives finite magnetization even below those critical values. This indicates that there occurs a transition from noncollinear to collinear configurations with increasing field or temperature. For slightly tilted external fields, a rotation of magnetization from out-of-plane to in-plane orientation is found with decreasing temperature.
http://dx.doi.org/10.1103/PhysRevB.75.214401
Tunable nanowires: an additional degree of freedom in plasmonics. - In: Physical review. Condensed matter and materials physics / American Physical Society. - College Park, Md. : APS, 1970-2015 , ISSN: 1550-235X , ZDB-ID: 1473011-X, ISSN 1550-235X, Bd. 76 (2007), 8, S. 085420, insges. 4 S.
We report on the excitation of surface plasmon polaritons (SPP's) on a periodic arrangement of metallic ribbons with tunable periodicity. The ability to vary its lattice constant results in an additional degree of freedom, permitting excitation of SPP's for any combination of wavelength and angle of incidence within the tuning range of the system. Moreover, the designed smart material allows fundamental questions to be answered regarding SPP propagation and localization. Finally, the concept opens vistas in the development of other methodologies in spectroscopy including plasmonic sensors and chips.
http://dx.doi.org/10.1103/PhysRevB.76.085420