Theory of the inverse Rashba-Edelstein effect induced by thermal spin injection

TL;DR

This paper presents a theoretical analysis of the inverse Rashba-Edelstein effect driven by thermal spin injection in a ferromagnetic insulator and 2DEG junction, elucidating dependencies on magnetization, spin texture, and temperature.

Contribution

It provides a theoretical framework for understanding how thermal spin injection induces electric currents via the inverse Rashba-Edelstein effect in such junctions.

Findings

Current depends on magnetization direction of FI

Current varies with spin texture on Fermi surface

Temperature influences the magnitude of induced current

Abstract

We theoretically consider a junction composed of a ferromagnetic insulator (FI) and a two-dimensional electron gas (2DEG) with Rashba- and Dresselhaus-type spin-orbit interactions. Using the Boltzmann equation, we calculate an electric current in 2DEG induced by the inverse Rashba-Edelstein effect when imposing the temperature difference between FI and 2DEG. We clarify how the induced current depends on the magnetization direction of FI, spin texture on the Fermi surface of 2DEG, and temperature. Our result provides an important foundation for an accurate analysis of the inverse Rashba-Edelstein effect induced by thermal spin injection.