Generating Spin Currents in Semiconductors with the Spin Hall Effect

Details Generating Spin Currents in Semiconductors with the Spin Hall Effect Generating Spin Currents in Semiconductors with the Spin Hall Effect

2006-05-27

arxiv.org/abs/cond-mat/0605672v1

Phys. Rev. Lett. 97, 096605 (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.97.096605

We investigate electrically-induced spin currents generated by the spin Hall effect in GaAs structures that distinguish edge effects from spin transport. Using Kerr rotation microscopy to image the spin polarization, we demonstrate that the observed spin accumulation is due to a transverse bulk electron spin current, which can drive spin polarization nearly 40 microns into a region in which there is minimal electric field. Using a model that incorporates the effects of spin drift, we determine the transverse spin drift velocity from the magnetic field dependence of the spin polarization.

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