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We consider the effect of an oscillating potential on the single-particlespectrum and the time-averaged persistent current of a one-dimensionalphase-coherent mesoscopic ring with a magnetic flux. We show that in a ringwith an even number of spinless electrons the oscillating potential has astrong effect on the persistent current when the excited side bands are closeto the eigen levels of a pure ring. Resonant enhancement of side bands of theFloquet state generates a sign change of the persistent current.Comment: 2 figure

Floquet states and persistent-current transitions in a mesoscopic ring