Suppression of Dyakonov-Perel spin relaxation in high-mobility n-GaAs.
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.
Dzhioev
R I
RI
A. F. Ioffe Physical Technical Institute, St. Petersburg, 194021, Russia.
Kavokin
K V
KV
Korenev
V L
VL
Lazarev
M V
MV
Poletaev
N K
NK
Zakharchenya
B P
BP
Stinaff
E A
EA
Gammon
D
D
Bracker
A S
AS
Ware
M E
ME