0 30 13 89 v 1 2 1 Ja n 20 03 Spin-photocurrent in p-SiGe quantum wells under terahertz laser irradiation


A detailed study of the circular photogalvanic effect (CPGE) in SiGe structures is presented. It is shown that the CPGE becomes possible due to the built-in asymmetry of quantum wells (QWs) in compositionally stepped samples and in asymmetrically doped structures. The photocurrent arises due to optical spin orientation of free carriers in QWs with spin… (More)


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