Spin dynamics of two-dimensional electrons with Rashba spin-orbit coupling and electron-electron interactions

TL;DR

This paper investigates how electron-electron interactions influence spin dynamics in two-dimensional electron gases with Rashba spin-orbit coupling, revealing that such interactions can enhance spin-relaxation time in the ballistic regime.

Contribution

It introduces a theoretical framework incorporating electron-electron interactions into spin dynamics analysis of 2DEGs with Rashba coupling, highlighting the impact on spin-relaxation times.

Findings

Electron-electron interactions can increase spin-relaxation time.

Derived diffusion equations using path-integral and Green's function methods.

Enhanced spin coherence in the ballistic regime due to interactions.

Abstract

We study the spin dynamics of two dimensional electron gases (2DEGs) with Rashba spin-orbit coupling by taking account of electron-electron interactions. The diffusion equations for charge and spin densities are derived by making use of the path-integral approach and the quasiclassical Green's function. Analyzing the effect of the interactions, we show that the spin-relaxation time can be enhanced by the electron-electron interaction in the ballistic regime.