Magneto-Gyrotropic Photogalvanic Effects in Semiconductor Quantum Wells
V. V. Bel'kov (1, 2), S. D. Ganichev (1, 2), E. L. Ivchenko (2),, S. A. Tarasenko (2), W. Weber (1), S. Giglberger (1), M. Olteanu (1), H.-P., Tranitz (1), S. N. Danilov (1), Petra Schneider (1), W. Wegscheider (1), D., Weiss (1)
TL;DR
This paper demonstrates that terahertz radiation induces spin-dependent photocurrents in semiconductor quantum wells under magnetic fields, revealing gyrotropic effects linked to asymmetric carrier relaxation processes.
Contribution
It provides a combined experimental and theoretical analysis of magneto-gyrotropic photogalvanic effects in quantum wells, introducing microscopic models based on asymmetry in photoexcitation and relaxation.
Findings
Photocurrents are caused by spin-dependent relaxation of non-equilibrium carriers.
Magneto-induced photocurrents are observed in various quantum well structures.
The effects are related to the gyrotropy and asymmetry of the quantum wells.
Abstract
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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