Orbital mechanism of the circular photogalvanic effect in quantum wells

Abstract

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.

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

Cited by in corpus (4)

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• Resonant circular photogalvanic effect in GaN/AlGaN heterojunctions