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Experimental observation of the unidirectional motion of a topologicalsoliton driven by a bi-harmonic ac force of zero mean is reported. Theobservation is made by measuring the current-voltage characteristics for afluxon trapped in an annular Josephson junction that was placed into amicrowave field. The measured dependence of the fluxon mean velocity (rectifiedvoltage) at zero dc bias versus the phase shift between the first and secondharmonic of the driving force is in qualitative agreement with theoreticalexpectations.Comment: 6 figure

Ratchetlike Dynamics of Fluxons in Annular Josephson Junctions Driven by Biharmonic Microwave Fields