Current-induced spin polarization in strained semiconductors

Phys Rev Lett. 2004 Oct 22;93(17):176601. doi: 10.1103/PhysRevLett.93.176601. Epub 2004 Oct 18.


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.