Berlin 2008 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 35: Spin controlled transport II

HL 35.7: Talk

Wednesday, February 27, 2008, 15:45–16:00, ER 164

Spin-Relaxation Dynamics due to Hole-Band Mixing in Bulk GaAs — Michael Krauß and •Hans Christian Schneider — Fachbereich Physik, TU Kaiserslautern, 67663 Kaiserslautern

We study theoretically the spin-dependent hole dynamics in undoped bulk GaAs. The influence of the spin-orbit interaction on the band structure is included by using an 8-band Luttinger Hamiltonian. We calculate the k-dependent occupation numbers for hole-band energy dispersions after optical excitation using Boltzmann scattering integrals. From the microscopic occupation numbers we obtain both the ensemble spin dynamics and the dynamics of the average spin at individual k-points: By examining the ensemble spin dynamics we can compare with exponential fits and determine the validity of a relaxation-time approximation for the hole spin. By examing the average spin at different k-vectors we can determine whether the dynamics is dominated by spin precession (Dyakonov-Perel like) or spin-dependent scattering (Elliott-Yafet like).