Weak localization, spin relaxation, and spin diffusion: Crossover between weak and strong Rashba coupling limits

Article

关键词: ORBIT INTERACTION;    QUANTUM-WELLS;    CONDUCTION ELECTRONS;    OXIDE INTERFACES;    MAGNETORESISTANCE;    ANTILOCALIZATION;   

DOI  :  10.1103/PhysRevB.90.125309

来源: SCIE

【 摘 要 】

Disorder scattering and spin-orbit coupling are together responsible for the diffusion and relaxation of spin density in time-reversal invariant systems. We study spin relaxation and diffusion in a two-dimensional electron gas with Rashba spin-orbit coupling and spin-independent disorder, focusing on the role of Rashba spin-orbit coupling in transport. Spin-orbit coupling contributes to spin relaxation, transforming the quantum interference contribution to conductivity from a negative weak localization (WL) correction to a positive weak antilocalization (WAL) correction. The importance of spin channel mixing in transport is largest in the regime where the Bloch state energy uncertainty h/tau and the Rashba spin-orbit splitting Delta(SO) are comparable. We find that as a consequence of this spin channel mixing, the WL-WAL crossover is nonmonotonic in this intermediate regime, which can be related to recent experimental studies of transport at two-dimensional oxide interfaces.

【 授权许可】

Free