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(Color online) Schematic diagram of the spin orientation-induced circular photogalvanic effect for direct transition between the lowest quantized-subband in the triangular quantum well and bulk GaN band.
(Color online) (a) Photocurrent as a function of the phase angle in sample A (solid circles). The data can be explained as a superposition (thick curve) of two components, which are CPGE current (dotted curve with 180° period) and LPGE current (dashed curve with 90° period). (b) Photocurrent as a function of the phase angle in sample B.
Magnetoresistance of the 2DEG in (a) sample A and (b) sample B as a function of magnetic field normal to the heterointerface. The insets in (a) and (b) show the fast Fourier transform (FFT) spectra of the SdH oscillations in each sample. Different concentrations of spin-up and spin-down electrons cause the split of peak in the FFT spectrum in sample A, which does not appear in sample B.
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