In situ control of spin-orbit coupling in coherent transport using a clean GaAs/AlGaAs 2DEG 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.
@article{arxiv.cond-mat/0206375,
title = {Gate-Controlled Spin-Orbit Quantum Interference Effects in Lateral Transport},
author = {J. B. Miller and D. M. Zumbuhl and C. M. Marcus and Y. B. Lyanda-Geller and D. Goldhaber-Gordon and K. Campman and A. C. Gossard},
journal= {arXiv preprint arXiv:cond-mat/0206375},
year = {2009}
}