Quantum interference of vortices in Josephson-junction arrays

We have experimentally studied a specially shaped array in which vortices can cross along a doubly connected path. After vortices are induced by a magnetic field, we observe a resistive branch in the current-voltage characteristic due to these vortex crossings. When the charge that is enclosed by th...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1994-02, Vol.194, p.1001-1002
Main Authors: Elion, W.J., Wachters, J.J., Sohn, L.L., Mooij, J.E.
Format: Article
Language:English
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Summary:We have experimentally studied a specially shaped array in which vortices can cross along a doubly connected path. After vortices are induced by a magnetic field, we observe a resistive branch in the current-voltage characteristic due to these vortex crossings. When the charge that is enclosed by the path is varied, the flux-flow resistance shows strong periodic oscillations. These oscillations have been predicted to arise from quantum interference of vortices. The oscilation is periodic with the single electron charge e, instead of the predicted 2e, due to tunneling of quasiparticles.
ISSN:0921-4526
DOI:10.1016/0921-4526(94)90830-3