Observation of electric current induced by optically injected spin current

Details Observation of electric current induced by optically injected spin current Observation of electric current induced by optically injected spin current

2006-08-25

arxiv.org/abs/cond-mat/0608546v1

Appl. Phys. Lett. 90, 242115 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

15 pages, 4 figures

Scientific paper

10.1063/1.2748843

A normally incident light of linear polarization injects a pure spin current in a strip of 2-dimensional electron gas with spin-orbit coupling. We report observation of an electric current with a butterfly-like pattern induced by such a light shed on the vicinity of a crossbar shaped InGaAs/InAlAs quantum well. Its light polarization dependence is the same as that of the spin current. We attribute the observed electric current to be converted from the optically injected spin current caused by scatterings near the crossing. Our observation provides a realistic technique to detect spin currents, and opens a new route to study the spin-related science and engineering in semiconductors.

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