D’yakonov-Perel’s Spin Relaxation Under Electron-Electron Collisions in QWs

Abstract

In recent years the electron spin relaxation processes have received much attention in connection with various spintronics applications. For free electrons in quantum well structures the following four mechanisms of spin decoherence are most important (see [1, 2] and references therein): the Elliot-Yafet, D’yakonov-Perel’, Bir-Aronov-Pikus mechanisms and electron spin-flip scattering by paramagnetic centers. This paper is devoted to the D’yakonov-Perel’ spin relaxation (DPSR) in which case the spin relaxation time, τ_s, is related to the spin splitting and given by [3]

$$ \tau _s^{ - 1} \left\langle { \propto \Omega _k^2 } \right\rangle \tau . $$

(1)