Current reversal in collective ratchets induced by lattice instability
L. Dinis, E.M. Gonzalez, J.V. Anguita, J.M.R. Parrondo, and J.L., Vicent
TL;DR
This paper proposes a collective mechanism for current reversal in superconducting vortex ratchets, based on a two-dimensional ground state instability, supported by simulations and experiments with Nb superconducting films.
Contribution
It introduces a novel collective mechanism for current reversal driven by lattice instability, supported by numerical and experimental evidence.
Findings
Current reversal occurs due to a 2D lattice instability.
Numerical simulations confirm the proposed mechanism.
Experimental results with Nb films support the theory.
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.
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