Current-Induced Polarization and the Spin Hall Effect at Room Temperature
Abstract
Electrically-induced electron spin polarization is imaged in n-type ZnSe epilayers using Kerr rotation spectroscopy. Despite no evidence for an electrically-induced internal magnetic field, current-induced in-plane spin polarization is observed with characteristic spin lifetimes that decrease with doping density. The spin Hall effect is also observed, indicated by an electrically-induced out-of-plane spin polarization with opposite sign for spins accumulating on opposite edges of the sample. The spin Hall conductivity is estimated as 3 +/- 1.5 Ohms**-1 m**-1/|e| at 20 K, which is consistent with the extrinsic mechanism. Both the current-induced spin polarization and the spin Hall effect are observed at temperatures from 10 K to 295 K.
Cite
@article{arxiv.cond-mat/0607288,
title = {Current-Induced Polarization and the Spin Hall Effect at Room Temperature},
author = {N. P. Stern and S. Ghosh and G. Xiang and M. Zhu and N. Samarth and D. D. Awschalom},
journal= {arXiv preprint arXiv:cond-mat/0607288},
year = {2007}
}
Comments
5 pages, 4 figures