Magneto-Gyrotropic Photogalvanic Effects in Semiconductor Quantum Wells

Details Magneto-Gyrotropic Photogalvanic Effects in Semiconductor Quantum Wells Magneto-Gyrotropic Photogalvanic Effects in Semiconductor Quantum Wells

2005-02-08

arxiv.org/abs/cond-mat/0502191v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1088/0953-8984/17/21/032

We show that free-carrier (Drude) absorption of both polarized and unpolarized terahertz radiation in quantum well (QW) structures causes an electric photocurrent in the presence of an in-plane magnetic field. Experimental and theoretical analysis evidences that the observed photocurrents are spin-dependent and related to the gyrotropy of the QWs. Microscopic models for the photogalvanic effects in QWs based on asymmetry of photoexcitation and relaxation processes are proposed. In most of the investigated structures the observed magneto-induced photocurrents are caused by spin-dependent relaxation of non-equilibrium carriers.

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