Phys. Rev. B 56, 87–90 (1997)Mode locking in discrete soliton dynamics under ac forcesReceived 10 March 1997; published in the issue dated 1 July 1997 We present here analytical arguments and numerical evidence for the existence of net directional motion of highly discrete sine-Gordon kinks under ac forces of zero average. We have also characterized the depinning of the oscillating kink under those circumstances, and analyzed the instability mechanisms of the phase-locked running solutions. Possible experimental relevance of this phenomenon in circular arrays of Josephson junctions is discussed. © 1997 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.56.87
DOI:
10.1103/PhysRevB.56.87
PACS:
74.50.+r, 05.45.+b
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