Strain-induced large spin splitting and persistent spin helix at LaAlO3/SrTiO3interface

• DOI: 10.7567/apex.10.123003
• Publication Date: 2017-11-08T09:13:56Z
• Authors: Naoya Yamaguchi; Fumiyuki Ishii
• Keywords: Condensed Matter - Materials Science; 0103 physical sciences; Materials Science (cond-mat.mtrl-sci); FOS: Physical sciences; 01 natural sciences

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 $��$ and spin texture in the momentum space using first-principles calculations. We found that the $��$ 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.<br/>3 pages, 3 figures, corrected typographical errors and misleading expressions<br/>