Theory of the spin galvanic effect at oxide interfaces

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.

5 pages, 3 figures

References in corpus (4)

• Highly efficient and tuneable spin-to-charge conversion through Rashba coupling at oxide interfaces
• Theory of spin-orbit coupling at LaAlO3/SrTiO3 interfaces and SrTiO3 surfaces
• Observation of Inverse Edelstein Effect in Rashba-Split 2DEG between SrTiO3 and LaAlO3 at Room Temperature
• Spin responses and effective Hamiltonian for the two dimensional electron gas at oxide interface {LaAlO}${}_3$/{SrTiO}${}_3$

Cited by in corpus (4)

• Boundary conditions for spin and charge diffusion in the presence of interfacial spin-orbit coupling
• Spin to charge conversion at Rashba-split SrTiO${}_3$ interfaces from resonant tunneling
• Edelstein Effect in Isotropic and Anisotropic Rashba Models
• Bilinear magnetoresistance in 2DEG with isotropic cubic Rashba spin-orbit interaction