# Theory of the spin galvanic effect at oxide interfaces

## TL;DR

This paper analyzes the spin galvanic effect at oxide interfaces, focusing on the LaAlO$_3$/SrTiO$_3$ interface, using a three-band model to understand spin-charge conversion and the effects of disorder and temperature.

## Contribution

It introduces a detailed three-band theoretical model for the spin galvanic effect at oxide interfaces, incorporating disorder and temperature effects to match experimental observations.

## Key findings

- Effective spin-orbit couplings vary across bands.
- Disorder and temperature significantly influence the SGE.
- The model aligns well with experimental data.

## Abstract

The spin galvanic effect (SGE) describes the conversion of a non-equilibrium spin polarization into a transverse charge current. Recent experiments have demonstrated a large conversion efficiency for the two-dimensional electron gas formed at the interface between two insulating oxides, LaAlO$_3$ and SrTiO$_3$. Here we analyze the SGE for oxide interfaces within a three-band model for the Ti t$_{2g}$ orbitals which displays an interesting variety of effective spin-orbit couplings in the individual bands that contribute differently to the spin-charge conversion. Our analytical approach is supplemented by a numerical treatment where we also investigate the influence of disorder and temperature, which turns out to be crucial to provide an appropriate description of the experimental data.