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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
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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.

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N. P. Stern, S. Ghosh, G. Xiang, M. Zhu, N. Samarth, D. D. Awschalom. 2006-07-11. Current-Induced Polarization and the Spin Hall Effect at Room Temperature. https://doi.org/10.1103/physrevlett.97.126603

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