title: Suppression of Dyakonov-Perel spin relaxation in high-mobility n-GaAs.
abstract: We report a large and unexpected suppression of the free electron spin-relaxation in lightly doped n-GaAs bulk crystals. The spin-relaxation rate shows a weak mobility dependence and saturates at a level 30 times less than that predicted by the Dyakonov-Perel theory. The dynamics of the spin-orbit field differs substantially from the usual scheme: although all the experimental data can be self-consistently interpreted as a precessional spin-relaxation induced by a random spin-orbit field, the correlation time of this random field, surprisingly, is much shorter than, and is independent of, the momentum relaxation time determined from transport measurements.
authors.affiliation: A. F. Ioffe Physical Technical Institute, St. Petersburg, 194021, Russia.
authors.forename: R I
authors.initials: RI
authors.lastname: Dzhioev
authors.forename: K V
authors.initials: KV
authors.lastname: Kavokin
authors.forename: V L
authors.initials: VL
authors.lastname: Korenev
authors.forename: M V
authors.initials: MV
authors.lastname: Lazarev
authors.forename: N K
authors.initials: NK
authors.lastname: Poletaev
authors.forename: B P
authors.initials: BP
authors.lastname: Zakharchenya
authors.forename: E A
authors.initials: EA
authors.lastname: Stinaff
authors.forename: D
authors.initials: D
authors.lastname: Gammon
authors.forename: A S
authors.initials: AS
authors.lastname: Bracker
authors.forename: M E
authors.initials: ME
authors.lastname: Ware