Broken symmetries associated with a Kagome chiral charge order
Date:
This work used polarization-dependent mid-infrared photocurrent microscopy to resolve the broken symmetries of the charge-ordered phase in KV$_3$Sb$_5$. We observed a longitudinal circular photogalvanic effect that emerges with the charge density wave order, directly constraining the inversion, mirror, and point-group symmetries of the low-temperature state. The results provided direct evidence for the intrinsic chiral nature of the Kagome charge order and established nonlinear photocurrent response as a sensitive probe of subtle symmetry breaking in quantum materials.
The published paper can be found here.
