Photo-induced pure spin currents in quantum wells

Details Photo-induced pure spin currents in quantum wells Photo-induced pure spin currents in quantum wells

2005-01-27

arxiv.org/abs/cond-mat/0501673v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

To be published in Proc. 13th Int. Symp. "Nanostructures: Physics and Technology", St.Petersburg, Russia, 2005

Scientific paper

As is well known the absorption of circularly polarized light in semiconductors results in optical orientation of electron spins and helicity-dependent electric photocurrent, and the absorption of linearly polarized light is accompanied by optical alignment of electron momenta. Here we show that the absorption of unpolarized light in a quantum well (QW) leads to generation of a pure spin current, although both the average electron spin and electric current are vanishing.

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