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MA: Magnetismus

MA 20: Poster: Films(1-36) Transp(37-56) Ex.Bias(57-67) Spindyn(68-80) Micromag(81-95) Particle(96-109) Imag.+Surface(110-113) Spinelectr(114-122) Theory+Micromag(123-131) Spinstr+Aniso(132-142) MagMat(143-156) Meas(157,158) MolMag+Kondo(159-162) Postdead(163-)

MA 20.116: Poster

Dienstag, 28. März 2006, 15:15–19:15, P1

Photoinduced magnetism in diluted magnetic semiconductors — •Oliver Pieper and Wolfgang Nolting — Institut für Physik, AG Theoretische Festkörperphysik, Humboldt-Universität zu Berlin, Newtonstraße 15, 12489 Berlin

We present a many-body-approach for a system of photogenerated electrons and holes in a diluted magnetic semiconductor. Photomagnetization is calculated selfconsistently by an effective field ansatz. While the magnetic impurity ions are treated in a virtual crystal approximation, the magnetic s-d-interaction is treated within an interpolating self-energy approach. (Quasipartical-)density of states as well as the polarisation of the photogenerated electrons and the magnetization of the local moments are calculated as a function of photonpower, photonfrequency, temperature and band-gap. The results are compared with experimental data.