Pure spin photocurrents in low-dimensional structures

Details Pure spin photocurrents in low-dimensional structures Pure spin photocurrents in low-dimensional structures

2005-02-07

arxiv.org/abs/cond-mat/0502171v1

Pis'ma Zh. Eksp. Teor. Fiz. 81, 292 (2005) [JETP Lett. 81, 231 (2005)]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures

Scientific paper

10.1134/1.1921322

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 leads to generation of a pure spin current, although both the average electron spin and electric current vanish. We demonstrate this for direct interband and intersubband as well as indirect intraband (Drude-like) optical transitions in semiconductor quantum wells (QWs).

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