Figure 4: Circular photo-galvanic current for different thicknesses.
From: Towards colloidal spintronics through Rashba spin-orbit interaction in lead sulphide nanosheets

(a) The CPGE current for 6, 9 and 18 nm thick sheets, measured as a function of the gate voltage. (b) CPGE current normalized by the background current, as a function of the gate voltage. Thinner sheets show higher gate dependencies.