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Precession and motional slowing of spin evolution in a high mobility two-dimensional electron gas
M A Brand1, A Malinowski, O Z Karimov
1Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom.
Physical Review Letters
|December 18, 2002
Abstract:
Optical spin-dynamic measurements in a high-mobility n-doped GaAs/AlGaAs quantum well show oscillatory evolution at 1.8 K consistent with a quasi-collision-free D'yakonov-Perel'-Kachorovskii regime. Above 5 K evolution becomes exponential as expected for collision-dominated spin dynamics. Momentum scattering times extracted from Hall mobility and Monte Carlo simulation of spin polarization agree at 1.8 K but diverge at higher temperatures, indicating the importance of electron-electron scattering and an intrinsic upper limit for the spin-relaxation rate.