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We report on the study of the linear and circular magneto-gyrotropicphotogalvanic effect (MPGE) in GaAs/AlGaAs quantum well structures. Using thefact that in such structures the Land\'e-factor g* depends on the quantum well(QW) width and has different signs for narrow and wide QWs, we succeeded toseparate spin and orbital contributions to both MPGEs. Our experiments showthat, for most quantum well widths, the PGEs are mainly driven by spin-relatedmechanisms, which results in a photocurrent proportional to the g* factor. Instructures with a vanishingly small g* factor, however, linear and circularMPGE are also detected, proving the existence of orbital mechanisms.

Spin and orbital mechanisms of the magneto-gyrotropic photogalvanic effects in GaAs/AlGaAs quantum well structures