We investigate theoretically the Rashba spin-orbit interaction in InAs/GaSb quantum wells(QWs). We find that the Rashba spin-splitting (RSS) depends sensitively on the thickness of the InAs layer. The RSS exhibits nonlinear behavior for narrow InAs/GaSb QWs and the oscillating feature for wide InAs/GaSb QWs. The nonlinear and oscillating behaviors arise from the weakened and enhanced interband coupling. The RSS also show asymmetric features respect to the direction of the external electric field.
@article{arxiv.0803.4310,
title = {Anomalous Rashba spin-orbit interaction in InAs/GaSb quantum wells},
author = {J. Li and Kai Chang and G. Q. Hai and K. S. Chan},
journal= {arXiv preprint arXiv:0803.4310},
year = {2009}
}