Fig. 3: Investigation on the origin of the circular photogalvanic effect.
From: Broken symmetries associated with a Kagome chiral charge order
a Polarization dependence of the normalized out-of-plane photocurrent measured on the same device which was cooled down with either right-circular (blue points) or left-circular polarized (orange points) light. b Out-of-plane (blue) and in-plane (red) photocurrent as a function of light polarization. The measurement was performed at \(T=10\) K. For the in-plane photocurrent measurement, all contacts except contacts C and B (as labeled in Fig. 1c) are grounded. c CPGE distribution measured as a function of the beam spot location at \(T=\,\)10 K. The major contribution of CPGE appears circular, consistent with prior reports of CPGE from other materials22,31, and occurs at the overlap region between graphite, KV3Sb5, and the bottom contact (the blue dashed line). d CPGE distribution measured as a function of the beam spot location at \(T=\) 120 K.
