Regensburg 2007 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 13: Poster 1
HL 13.35: Poster
Monday, March 26, 2007, 15:00–17:30, Poster A
Effects of initial spin polarization and external magnetic fields on the electron spin dephasing in a two dimensional electron system — •Dominik Stich1, Robert Schulz1, Andreas Maurer1, Tobias Korn1, Dieter Schuh1, Werner Wegscheider1, Jun Zhou2, Ming Wei Wu2, and Christian Schüller1 — 1Institut für Experimentelle und Angewandte Physik II, Universität Regensburg, D-93040 Regensburg, Germany — 2Hefei National Laboratory, University of Science and Technology of China, Hefei, 230026, China
Understanding the properties of electron spin dephasing is a very crucial detail for any future spin-electronic device. We investigated the electron spin dynamics in a high mobility (1.6 × 106 cm2/Vs) two dimensional electron system in a one side n-doped (2.1 × 1011 cm2) 20 nm wide GaAs-AlGaAs single quantum well by conducting time-resolved Faraday rotation (TRFR) measurements in the range from zero to high magnetic fields (up to 10T) which are applied in the Voigt configuration. We found that the spin dephasing time T2* is strongly depending on the initial degree of spin polarization P and on the applied magnetic field. Besides that, we also found that the electron g-factor is increasing with decreasing P. At very low sample temperatures (1.5 K) we also observed zero field spin oscillations [Brand et al. PRL 89, 236601(2002)]. Our measurements are in good accordance with the calculations done by Wu et al. that are based on solving the many body kinetic Bloch equations.
We acknowledge support by the Deutsche Forschungsgemeinschaft via project SCHU1171/1 and SFB 689 TP B4.