title: Precession and motional slowing of spin evolution in a high mobility two-dimensional electron gas.
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.
authors.affiliation: Department of Physics and Astronomy, University of Southampton, Southampton SO17 1BJ, United Kingdom.
authors.forename: M A
authors.initials: MA
authors.lastname: Brand
authors.forename: A
authors.initials: A
authors.lastname: Malinowski
authors.forename: O Z
authors.initials: OZ
authors.lastname: Karimov
authors.forename: P A
authors.initials: PA
authors.lastname: Marsden
authors.forename: R T
authors.initials: RT
authors.lastname: Harley
authors.forename: A J
authors.initials: AJ
authors.lastname: Shields
authors.forename: D
authors.initials: D
authors.lastname: Sanvitto
authors.forename: D A
authors.initials: DA
authors.lastname: Ritchie
authors.forename: M Y
authors.initials: MY
authors.lastname: Simmons