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American Physical Society, Physical review B, 21(76)

DOI: 10.1103/physrevb.76.212507

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Current reversal in collective ratchets induced by lattice instability

Journal article published in 2007 by L. Dinis, E. M. González, J. V. Anguita, J. M. R. Parrondo ORCID, J. L. Vicent
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This paper is available in a repository.

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Abstract

A collective mechanism for current reversal in superconducting vortex ratchets is proposed. The mechanism is based on a two-dimensional instability of the ground state (T=0) of the system. We illustrate our results with numerical simulations and experiments in Nb superconducting films fabricated on top of Si substrates with artificially induced asymmetric pinning centers. Comment: 5 pages, 4 figures. Accepted for publication in Phys. Rev. B