Current reversal in collective ratchets induced by lattice instability

Details Current reversal in collective ratchets induced by lattice instability Current reversal in collective ratchets induced by lattice instability

2007-12-03

arxiv.org/abs/0712.0308v1

Phys. Rev. B 76, 212507 (2007)

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.76.212507

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.

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