The spin galvanic effect (SGE) describes the conversion of a nonequilibrium spin polarization into a transverse charge current. Recent experiments have demonstrated a large conversion efficiency for the twodimensional electron gas formed at the interface between two insulating oxides, LaAlO3 and SrTiO3. 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 providing an appropriate description of the experimental data.

Theory of the Spin Galvanic Effect at Oxide Interfaces / Seibold, G; Caprara, Sergio; Grilli, Marco; Raimondi, Roberto. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 119:(2017), p. 256801. [10.1103/PhysRevLett.119.256801]

Theory of the Spin Galvanic Effect at Oxide Interfaces

SEIBOLD, GOTZ ULRICH;Caprara Sergio;GRILLI, Marco;
2017

Abstract

The spin galvanic effect (SGE) describes the conversion of a nonequilibrium spin polarization into a transverse charge current. Recent experiments have demonstrated a large conversion efficiency for the twodimensional electron gas formed at the interface between two insulating oxides, LaAlO3 and SrTiO3. 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 providing an appropriate description of the experimental data.
2017
Spin polarization; spin-orbit coupling; spintronics; two-dimensional electron gas
01 Pubblicazione su rivista::01a Articolo in rivista
Theory of the Spin Galvanic Effect at Oxide Interfaces / Seibold, G; Caprara, Sergio; Grilli, Marco; Raimondi, Roberto. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - STAMPA. - 119:(2017), p. 256801. [10.1103/PhysRevLett.119.256801]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1070063
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