Drift-Diffusion Approach to Spin-Polarized Transport

TL;DR

This paper introduces a novel drift-diffusion model for electron spin polarization in 2D systems, incorporating superpositions, spin-orbit coupling, and electric fields, and applies it to spin relaxation analysis.

Contribution

It develops a new drift-diffusion equation that accounts for superpositions of spin states and spin-orbit interactions, advancing the modeling of spin transport.

Findings

Model accurately describes spin relaxation dynamics.

Incorporates Dresselhaus and Rashba effects.

Results align with previous research.

Abstract

We develop a drift-diffusion equation that describes electron spin polarization density in two-dimensional electron systems. In our approach, superpositions of spin-up and spin-down states are taken into account, what distinguishes our model from the traditional two-component drift-diffusion approximation. The Dresselhaus and Rashba spin-orbit coupling mechanisms are incorporated into consideration, as well as an applied electric field. The derived equation is applied to the modelling of relaxation of homogeneous spin polarization. Our results are consistent with previous studies.