Dresden 2009 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.37: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Spin-flip Probabilities in Concentrated and Diluted Ferromagnetic Semiconductors — •Gerald Rosenthal and Wolfgang Nolting — Humboldt-Universität zu Berlin, Institut für Physik, Newtonstr. 15, 12489 Berlin

We present an exact Green's function study of the electronic energy spectrum of a ferromagnetic semiconductor at T = 0K within the framework of the single-band as well as multi-band Kondo-lattice model. Main focus is put on quasiparticle densities of states, dispersion relations and spin-flip probabilities. The spectrum decomposes into a scattering part (magnon emission) and a quasiparticle part (magnetic polaron). The spin-flip oscillation period of the magnetic polaron can quantitatively be determined. Furthermore, the influence of disorder (diluted ferromagnetic semiconductors) on the energy spectrum and spin-flip probabilities will be discussed.