It is revealed that in spin helix state of (001) quantum well system, strong suppression of D'yakonov-Perel' spin relaxation process occurs by an interplay between Rashba and Dresselhaus couplings over a wide range of Rashba coupling strength. Contrary to common belief in early works, this leads to the finding that Datta-Das type spin-field effect transistor is actually applicable to more realistic non-ballistic transport regime in two dimensional electron gas system.
@article{arxiv.0706.3557,
title = {Datta-Das type spin-field effect transistor in non-ballistic regime},
author = {Munekazu Ohno and Kanji Yoh},
journal= {arXiv preprint arXiv:0706.3557},
year = {2009}
}