Fig. 3: CPC dependent on illumination position, Gaussian spot size, and laser intensity.

a Photocurrent for different illumination location as a function of the quarter-wave plate angle. The circular dots represent experimental data, while the solid line represents the curve fitted using Eq. (1). The error bars of I_pc represent the standard deviation. b Fitted C as a function of X position along the perpendicular bisector of channel. c Fitted C as a function of Y position along the channel. The insets in (b) and (c) depict the relative displacement of laser spot with respect to the device. The yellow and gray areas represent the metal electrode and the MoTe₂ sample, respectively. d The spot size dependence of fitted C under 1100 nm illumination at a fixed position. The w is standard deviation of Gaussian distribution correlated with the spot size. The solid curve is guideline for eyes. e The power dependence of fitted C at minimum spot size under 1100 nm illumination. The measurements were carried out without applying bias or gate voltage. The error bars of fitted C represent the standard error.