Rocking ratchets in 2D Josephson networks: collective effects and current reversal

Phys. Rev. Lett. 98, 047006 (2007) A detailed numerical study on the directed motion of ac-driven vortices and antivortices in 2D Josephson junction arrays (JJA) with an asymmetric periodic pinning potential is reported. Dc-voltage rectification shows a strong dependence on vortex density as well as...

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Bibliographic Details
Main Author Marconi, Verónica I
Format Journal Article
LanguageEnglish
Published 15.12.2006
Subjects
Physics - Superconductivity
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Summary:Phys. Rev. Lett. 98, 047006 (2007) A detailed numerical study on the directed motion of ac-driven vortices and antivortices in 2D Josephson junction arrays (JJA) 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 ($f$=$Ha^2 / \Phi_0$), in good agreement with recent experiments by Shal\'om and Pastoriza [Phys. Rev. Lett. {\bf 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.
DOI:10.48550/arxiv.cond-mat/0612390