Rocking Ratchets in Two-Dimensional Josephson Networks: Collective Effects and Current Reversal
Verónica I. Marconi
DOI 10.1103/PhysRevLett.98.047006 · Physical Review Letters
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Abstract
A detailed numerical study on the directed motion of ac-driven vortices and antivortices in 2D Josephson junction arrays with an asymmetric periodic pinning potential is reported. dc-voltage rectification shows a strong dependence on vortex density as well as an inversion of the vortex flow direction with ac amplitude for a wide range of vortex density around f=1/2 (f=Ha2/Φ0), in good agreement with recent experiments by Shalóm and Pastoriza [Phys. Rev. Lett. 94, 177001 (2005)]. The study of vortex structures, spatial and temporal correlations, and vortex-antivortex pairs formation gives insight into a purely collective mechanism behind the current reversal effect.
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