Dresden 2006 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 13: Spin controlled transport I

HL 13.1: Vortrag

Dienstag, 28. März 2006, 11:00–11:15, BEY 118

Dynamics of Spin-Flip Scattering due to the Bir-Aronov-Pikus Mechanism — •Hans Christian Schneider — FB Physik, TU Kaiserslautern

After a brief review of existing theoretical results on electron-hole exchange scattering in semiconductors (Bir-Aronov-Pikus mechanism), numerical results on the dynamics of this scattering mechanism and its interplay with spin-conserving Coulomb scattering are presented. It is shown that for low electron densities a single spin relaxation-time can approximate the results of the full calculation rather well, even though the individual scattering rates are strongly energy-dependent. This spin-relaxation time is evaluated for a wide range of temperatures and densities and is shown to agree well with recent experiments. The results are also compared with widely-used simplified expressions for spin relaxation-times that are only valid for extremely high and low p-doping concentrations. The interesting range of doping concentrations and temperatures around hole degeneracy, which cannot be described by simplified expressions, is discussed in detail.