A Quantum Spin Hall Round Disk as a Spin Rotator and Filter
Mesoscale and Nanoscale Physics
2009-08-07 v1
Abstract
We study theoretically the spin transport of a Quantum Spin Hall round disk. When an electron traverses the disk in virtue of the edge states, its spin's in-plane component can be rotated by a magnetic flux through the disk. The spin rotation occurs due to the interference of two helical edge states with opposite spins, which is regarded as the Aharonov-Bohm effect in the spin space and a manifestation of the Berry phase. Besides, the disk has a spin filter effect on the tunneling current when we apply an appropriate magnetic field and gate voltage on it. The spin polarization ratio can reach 100% when the couplings between the disk and leads are weak.
Cite
@article{arxiv.0908.0890,
title = {A Quantum Spin Hall Round Disk as a Spin Rotator and Filter},
author = {Zhan-Feng Jiang and Wen-Yu Shan},
journal= {arXiv preprint arXiv:0908.0890},
year = {2009}
}
Comments
6 pages, 4 figures