We consider a two-channel spin transistor with weak spin-orbit induced interband coupling. We show that the coherent transfer of carriers between the coupled channels gives rise to an \textit{additional} spin rotation. We calculate the corresponding spin-resolved current in a Datta-Das geometry and show that a weak interband mixing leads to enhanced spin control.
@article{arxiv.cond-mat/0209682,
title = {Datta-Das transistor with enhanced spin control},
author = {J. Carlos Egues and Guido Burkard and Daniel Loss},
journal= {arXiv preprint arXiv:cond-mat/0209682},
year = {2009}
}