Publication: Current reversal in collective ratchets induced by lattice instability
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American Physical Society
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.
©2007 The American Physical Society. We acknowledge support by Spanish Ministerio de Educación y Ciencia NAN04- 09087, FIS05-07392, MAT05- 23924E, MOSAICO, CAM S-0505/ESP/0337, and UCMSantander. Computer simulations were performed at “Cluster de cálculo para Técnicas Físicas” of UCM, funded in part by the UE-FEDER program and in part by UCM and in the “Aula Sun Microsystems” at UCM.