Regensburg 2007 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster:ThinFilms(1-33),Transp.(34-49),ExchBias(50-56),
Spindynamics(57-70),Micro-nanostr.Mat.(71-82),
Particles/Clust.(83-88), Mag.Imag./Surface(89-96),
Spinelectronics(97-109), Theory/Micromag.(110-116),
Spinstruct/Phasetr.(117-128),Magn.Mat.(129-139),
Aniso.+Measuring(140-145), MolMag.(146-152),
MSMA(153-156)

MA 15.68: Poster

Dienstag, 27. März 2007, 15:00–19:00, Poster A

Electronic control of magnetization in magnetic diluted quantum dots — Tobias Voigt, •Peter Moraczewski, and Daniela Pfannkuche — I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, 20355 Hamburg

Recent investigations have suggested precise control of ferromagnetism in diluted magnetic (II,Mn)VI semiconductor quantum dots by variation of electron numbers [1]. The spins of the itinerant electrons couple the spins of the localized manganese ions leading to dilute ferromagnetism. We study effects of electron-electron interaction on the magnetization of the localized Mn impurities in these systems. Due to e. g. Hunds rule coupling we expect deviations from the electron number dependence of the magnetization observed in [1].

Manganese atoms in GaAs act as acceptors. In contrast to electron systems a striking difference in the behaviour of the hole states is expected because of the degeneracy in the valence bands of GaAs. We examine the impact of the localized Mn impurities on the hole states in the quantum dot.

[1] J. Fernández-Rossier and L. Brey, PRL 93, 117201 (2004)