Fig. 1: Observation of the longitudinal circular photogalvanic effect in KV3Sb5.
From: Broken symmetries associated with a Kagome chiral charge order
a Overview of the mid-IR photocurrent microscope setup. b Schematic illustrating the device configuration for measuring the out-of-plane photocurrent (Iz). c Optical microscopy image of the device. The electrodes are labeled as A-E. d Spatial mapping of the Iz photocurrent, with the largest signal observed at the intersection between graphite and KV3Sb5. e Polarization dependence of Iz when the beam spot is positioned at the marked star in (d). The pump light polarization evolves from left-circular (LC) to horizontal (LH) to right-circular (RC) to horizontal (LH) and back to left-circular (LC) as the QWP angle changes from 45 to 225 degrees. f Decomposition of the photocurrent into four different channels, where A-D denote the fitting parameters in Eq. (1). The error bars are based on the combination of one standard deviation of the fitting parameters and the measurement uncertainties.
