Gate-controlled spin-orbit quantum interference effects in lateral transport.
In situ control of spin-orbit coupling in coherent transport using a clean GaAs/AlGaAs two-dimensional electron gas is realized, leading to a gate-tunable crossover from weak localization to antilocalization. The necessary theory of 2D magnetotransport in the presence of spin-orbit coupling beyond the diffusive approximation is developed and used to analyze experimental data. With this theory the Rashba contribution and linear and cubic Dresselhaus contributions to spin-orbit coupling are separately estimated, allowing the angular dependence of spin-orbit precession to be extracted at various gate voltages.
Miller
J B
JB
Department of Physics, Harvard University, Cambridge, Massachusetts 02138, USA.
Zumbühl
D M
DM
Marcus
C M
CM
Lyanda-Geller
Y B
YB
Goldhaber-Gordon
D
D
Campman
K
K
Gossard
A C
AC