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

Yasufumi Araki, Guru Khalsa, Allan H. Macdonald

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

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 /τ and the Rashba spin-orbit splitting ΔSO 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.

Original languageEnglish
Article number125309
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume90
Issue number12
DOIs
Publication statusPublished - 2014 Sep 17

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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