Current reversal in collective ratchets induced by lattice instability

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.

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

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• Superconducting Fluxon Pumps and Lenses
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Cited by in corpus (9)

• Nucleation of superconductivity and vortex matter in superconductor - ferromagnet hybrids
• Reversible Ratchet Effects for Vortices in Conformal Pinning Arrays
• Vortex ratchet reversal in an asymmetric washboard pinning potential subject to combined dc and ac stimuli
• Vortex ratchet reversal: The role of interstitial vortices
• Transverse ac Driven and Geometric Ratchet Effects for Vortices in Conformal Crystal Pinning Arrays
• Transverse ratchet effect and superconducting vortices: Simulation and experiment
• Collective Dynamics and Defect Generation for Wigner Crystal Ratchets
• Magnetic Field Effects and Transverse Ratchets in Charge Lattices Coupled to Asymmetric Substrates
• Current reversals in driven lattice gases and Brownian motion