Current-induced polarization and the spin hall effect at room temperature

N. P. Stern, S. Ghosh, G. Xiang, M. Zhu, N. Samarth, D. D. Awschalom

Research output: Contribution to journalArticlepeer-review

181 Scopus citations

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±1.5Ω-1m-1/|e| at 20K, which is consistent with the extrinsic mechanism. Both the current-induced spin polarization and the spin Hall effect are observed at temperatures from 10 to 295K.

Original languageEnglish (US)
Article number126603
JournalPhysical review letters
Volume97
Issue number12
DOIs
StatePublished - 2006

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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