Phys. Rev. Lett. 93, 087001 (2004) [4 pages]Ratchetlike Dynamics of Fluxons in Annular Josephson Junctions Driven by Biharmonic Microwave FieldsReceived 12 November 2003; published 16 August 2004 Experimental observation of the unidirectional motion of a topological soliton driven by a biharmonic ac force of zero mean is reported. The observation is made by measuring the current-voltage characteristics for a fluxon trapped in an annular Josephson junction that was placed into a microwave field. The dependence of the fluxon mean velocity at zero dc bias versus the phase shift between the first and second harmonic of the driving force is in qualitative agreement with theoretical expectations. © 2004 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.93.087001
DOI:
10.1103/PhysRevLett.93.087001
PACS:
74.50.+r, 05.45.–a, 85.25.–j
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