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Nonreciprocal charge transport phenomena are widely studied intwo-dimensional superconductors, which demonstrate unidirectional-anisotropymagnetoresistances as a result of symmetry breaking. Here, we report a strongnonreciprocal transport phenomenon in superconducting CsV$_{3}$Sb$_{5}$ thinflakes. The second harmonic voltages, mainly originating from the rectificationeffect of vortex motion, are unambiguously developed with in-plane andout-of-plane magnetic fields, and their magnitudes are comparable to those innoncentrosymmetric superconductors. The second harmonic magnetoresistancessplit into several peaks and some of them reverse their signs by ramping themagnetic field or the current within the superconducting transition. Thenonreciprocity suggests a strong asymmetry in CsV$_{3}$Sb$_{5}$. Thecentrosymmetric structure and symmetric electronic phases in CsV$_{3}$Sb$_{5}$can hardly induce the distinct nonreciprocal transport phenomenon, which couldbe correlated to a symmetry breaking from an unconventional superconductingorder parameter symmetry.

Nonreciprocal Charge Transport in Topological Kagome Superconductor CsV$_{3}$Sb$_{5}$