Microscopic theory of Rashba-Edelstein magnetoresistance

TL;DR

This paper develops a microscopic theoretical model for Rashba-Edelstein magnetoresistance in a 2DEG with spin-orbit interactions, considering magnon effects and interface variations, providing insights into the sign and behavior of REMR.

Contribution

It introduces an analytic microscopic framework for REMR in 2DEGs with spin-orbit coupling, including magnon contributions and interface effects.

Findings

REMR sign depends on interface type

Analytic expressions for spin and current densities derived

Relevance to experimental observations discussed

Abstract

We theoretically study Rashba-Edelstein magnetoresistance (REMR) in a two-dimensional electron gas (2DEG) system with Rashba and Dresselhaus spin-orbit interactions. We consider a microscopic model of a junction system composed of a ferromagnetic insulator and a 2DEG, and derive analytic expressions for the spin and current densities in the 2DEG using the Boltzmann equation, while taking into account dynamical contributions from magnons. Our findings reveal that the sign of the REMR varies depending on the type of interface. We also discuss the experimental relevance of our results.