title: 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 Omega(-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 to 295 K.
authors.affiliation: Center for Spintronics and Quantum Computation, University of California-Santa Barbara, CA 93106, USA.
authors.forename: N P
authors.initials: NP
authors.lastname: Stern
authors.forename: S
authors.initials: S
authors.lastname: Ghosh
authors.forename: G
authors.initials: G
authors.lastname: Xiang
authors.forename: M
authors.initials: M
authors.lastname: Zhu
authors.forename: N
authors.initials: N
authors.lastname: Samarth
authors.forename: D D
authors.initials: DD
authors.lastname: Awschalom