FIG. 3.
(a) Photocurrent density jx normalized to the radiation power P as a function of the incident photon energy ħω with respect to the energy gap for an incidence angle θ = 90°. Positive (Negative) photocurrent direction corresponds to right (left) circularly polarized light. (b) Absorption coefficients for different polarizations as a function of incident photon energy. The close similarity between absorption coefficients for xx and yy polarizations corresponds to the symmetry of the system under study.