Polar Kerr effect studies of charge-density wave phase in CsV₃Sb₅

We report novel results on the details of charge-density order in kagome superconductor CsV3Sb5. High-resolution polar Kerr rotation was measured using Sagnac interferometer to test for highly discussed loop current state, which is predicted to onset simultaneously with charge-density wave (CDW) phase. This work is continuation of the study reported in Phys. Rev. Lett. 131, 016901. To further extend our study, we report measurement preformed at a diferent wavelength of 830 nm in addition to previously reported results probed with 1550 nm wavelength. Probe at a different energy scale sheds new light at the state of CDW in CsV3Sb5.