Figure 1
From: Spin transport study in a Rashba spin-orbit coupling system
Experimental set-up.
(a) A schematic illustration of the geometry of the experiment. Two circle electrodes and two stripe electrodes are attached to the sample by evaporating the Ti/Al/Ni/Au metal multilayer structure. A laser with wavelength of 1064 nm vertically irradiates on the sample. (b) PIAHE current as a function of the longitudinal electric field in an Al0.25Ga0.75N/GaN heterostructure with the light irradiated vertically at the center of the two circle electrodes. The red solid line is a linear fit. Inset is the spin-related photocurrent measured as a function of the quarter wave plate angle when E = −1 V/cm. The red solid line is the fitting line. The black dashed line is the extracted PIAHE current as a function of the quarter wave plate angle, which is sensitive to the circularly polarized light and achieves maximum when φ = ±45°. The black line is the extracted LPGE current as a function of quarter wave plate angle, which is sensitive to the linearly polarized light and achieves maximum magnitude when φ = ±90°.
