Boltzmann theory of the inverse Edelstein effect in a two-dimensional Rashba gas

TL;DR

This paper presents a Boltzmann theory for the inverse Edelstein effect in a Rashba 2D electron gas, providing analytical expressions for charge and spin currents influenced by interfacial interactions.

Contribution

It offers the first analytical Boltzmann-based model for the inverse Edelstein effect in Rashba systems, linking microscopic parameters to transport responses.

Findings

Derived closed-form expressions for charge and spin currents.

Identified regimes with different spin-to-charge conversion efficiencies.

Provided insights for experimental benchmarking on oxide interfaces.

Abstract

We investigate the inverse Edelstein effect in a non-homogeneous system consisting of a ferromagnetic layer coupled to a Rashba two-dimensional electron gas. Within a semiclassical Boltzmann framework, we derive analytical expressions for the charge and spin currents and analyze their dependence on key parameters such as the chemical potential and the Rashba coupling strength. We show how interfacial exchange and spin-orbit interactions jointly control the efficiency of spin-to-charge conversion, leading to distinct regimes characterized by qualitatively different transport responses. A central outcome of our work is the availability of closed-form analytical results, which provide direct physical insight and enable a transparent and quantitative benchmarking with experiments on complex oxide interfaces, such as LaAlO$_3$/SrTiO$_3$.