By means of electrical transport measurements we have studied the rectified motion of vortices in ratchet potentials engineered on over-damped Josephson junction arrays. The rectified voltage as a function of the vortex density shows a maximum efficiency close a matching condition to the period of the ratchet potential indicating a collective vortex motion. Vortex current reversals where detected varying the driving force and vortex density revealing the influence of vortex-vortex interaction in the ratchet effect.
@article{arxiv.cond-mat/0411507,
title = {Vortex motion rectification in Josephson junction arrays with a ratchet potential},
author = {D. E. Shalom and H. Pastoriza},
journal= {arXiv preprint arXiv:cond-mat/0411507},
year = {2007}
}