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Phys Rev Lett. 2004 Oct 22;93(17):176601. Epub 2004 Oct 18.

Current-induced spin polarization in strained semiconductors.

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Center for Spintronics and Quantum Computation, University of California, Santa Barbara, California 93106, USA.


The polarization of conduction electron spins due to an electrical current is observed in strained nonmagnetic semiconductors using static and time-resolved Faraday rotation. The density, lifetime, and orientation rate of the electrically polarized spins are characterized by a combination of optical and electrical methods. In addition, the dynamics of the current-induced spins are investigated by utilizing electrical pulses generated from a photoconductive switch. These results demonstrate the possibility of a spin source for semiconductor spintronic devices without the use of magnetic materials.

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