Theory of the spin galvanic effect at oxide interfaces
- Resource Type
- Working Paper
- Authors
- Seibold, G.; Caprara, S.; Grilli, M.; Raimondi, R.
- Source
- Phys. Rev. Lett. 119, 256801 (2017)
- Subject
- Condensed Matter - Mesoscale and Nanoscale Physics
- Language
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.
Comment: 5 pages, 3 figures