Orbital mechanism of the circular photogalvanic effect in quantum wells

Details Orbital mechanism of the circular photogalvanic effect in quantum wells Orbital mechanism of the circular photogalvanic effect in quantum wells

2007-01-12

arxiv.org/abs/cond-mat/0701274v1

Pis'ma v ZhETF 85, 216 (2007) [JETP Lett. 85, 182 (2007)]

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 2 figures, to be published in JETP Letters

Scientific paper

10.1134/S0021364007030113

It is shown that the free-carrier (Drude) absorption of circularly polarized radiation in quantum well structures leads to an electric current flow. The photocurrent reverses its direction upon switching the light helicity. A pure orbital mechanism of such a circular photogalvanic effect is proposed that is based on interference of different pathways contributing to the light absorption. Calculation shows that the magnitude of the helicity dependent photocurrent in $n$-doped quantum well structures corresponds to recent experimental observations.

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