Abstract
We report on the observation of the magneto-photogalvanic effect (MPGE) due to inter-subband transitionsin (001)-oriented GaAs quantum wells. This effect is related to the gyrotropic properties of thestructures. It is shown that inter-subband absorption of linearly polarized radiation maylead to spin-related as well as spin-independent photocurrents if an external magnetic fieldis applied in the plane of the quantum well. The experimental results are analysed interms of the phenomenological theory and microscopic models of MPGE basedon either asymmetric optical excitation or asymmetric relaxation of carriers ink-space. We observed resonant photocurrents not only at oblique incidence of radiation butalso at normal incidence, demonstrating that conventionally applied selection rules for theinter-subband optical transitions are not rigorous.
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