Strain-induced large spin splitting and persistent spin helix at LaAlO${}_3$/SrTiO${}_3$ interface

Abstract

We investigated the effect of the tensile strain on the spin splitting at the n-type interface in LaAlO${}_3$/SrTiO${}_3$ in terms of the spin-orbit coupling coefficient $\alpha$ and spin texture in the momentum space using first-principles calculations. We found that the $\alpha$ could be controlled by the tensile strain and be enhanced up to 5 times for the tensile strain of 7%, and the effect of the tensile strain leads to a persistent spin helix, which has a long spin lifetime. These results support that the strain effect on LaAlO${}_3$/SrTiO${}_3$ is important for various applications such as spinFET and spin-to-charge conversion.

3 pages, 3 figures, corrected typographical errors and misleading expressions

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