Magneto-Gyrotropic Photogalvanic Effect in Semiconductor Quantum Wells

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

2003-11-20

arxiv.org/abs/cond-mat/0311474v1

Physics

Condensed Matter

15 pages, 4 figures

Scientific paper

We investigate both experimentally and theoretically, the magneto-gyrotropic photogalvanic effect in zinc-blende based quantum wells with $C_{2v}$ point-group symmetry using optical excitation in the terahertz frequency range. The investigated frequencies cause intra-subband but no inter-band and inter-subband transitions. While at normal incidence the photocurrent vanishes at zero magnetic field, it is shown that an in-plane magnetic field generates photocurrents both for polarized and unpolarized excitation. In general the spin-galvanic effect, caused by circularly polarized light, and the magneto-gyrotropic effect, caused by unpolarized excitation, is superimposed. It is shown that in the case of two specific geometries both effects are separable.

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