Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction
Abstract
We investigate the enhancement of spin polarization in a quantum wire in the presence of a constriction and a spin-orbit coupling segment. It is shown that the spin-filtering effect is significantly heightened in comparison with the configuration without the constriction. It is understood in the studies that the constriction structure plays a critical role in enhancing the spin filtering by means of confining the incident electrons to occupy one channel only while the outgoing electrons occupy two channels. The enhancement of spin-filtering has also been analyzed within the perturbation theory. Because the spin polarization arises mainly from the scattering between the constriction and the segment with spin-orbit coupling, the sub-band mixing induced by spin-orbit interaction in the scattering process and the interferences result in higher spin-filtering effect.
Cite
@article{arxiv.0709.0203,
title = {Enhancement of polarization in a spin-orbit coupling quantum wire with a constriction},
author = {Jun-Feng Liu and Zhi-Cheng Zhong and Lei Chen and Dingping Li and Chao Zhang and Zhongshui Ma},
journal= {arXiv preprint arXiv:0709.0203},
year = {2008}
}
Comments
8 pages, 7 figures