Abstract
We investigate the topological effect of charge density wave (CDW). We found a ``beat'' Shapiro step structure in ${\text{NbSe}}_{3}$ topological (ring) crystals. We interpreted it as an evidence of the circulating CDW current that flows in the rings and modifies the CDW fundamental frequency, namely, narrow-band-noise frequency. This result also implied that a precursor of Fr\"ohlich's CDW supercurrent emerged in the ring system.
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