Berlin 2008 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 35: Spin controlled transport II

HL 35.5: Vortrag

Mittwoch, 27. Februar 2008, 15:15–15:30, ER 164

Dyakonov-Perel Spin Dynamics in Bulk GaAs — •Michael Krauß and Hans Christian Schneider — Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern

We study theoretically the spin-dependent carrier dynamics due to the Dyakonov-Perel mechanism in undoped and n-doped bulk GaAs. By solving a dynamical equation for the k-dependent spin-density matrix including Boltzmann scattering integrals we obtain quantitative results for spin relaxation and dephasing times after optical excitation. We study the influence of excitation conditions, i.e., optical excitation at the band gap vs. excitation in the band, and temperatures on the spin-dependent carrier dynamics. In particular, we find that different excitation conditions lead to relaxation times that differ by up to two orders of magnitude.