Abstract
We report the experimental observation of photo-assisted generation of helicity dependent photocurrents (PA-HDPC) in a GaAs/Al0.3Ga0.7As two-dimensional electron gas, which is distinct from the circular photogalvanic effect (CPGE). The PA-HDPC is generated under suppressed configuration of CPGE with the illumination of an obliquely incident unpolarized radiation in the system of C2v point group symmetry. We suggest that the PA-HDPC originates from spin-orbit coupling as well as the CPGE. The unpolarized assisted radiation, instead of the circularly polarized radiation, imposes an asymmetric distribution of the spin-polarized carriers in the system and results in a helicity dependent photocurrent.
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