Depinning of kinks in a Josephson-junction ratchet array

Abstract

We have measured the depinning of trapped kinks in a ratchet potential using a fabricated circular array of Josephson junctions. Our ratchet system consists of a parallel array of junctions with alternating cell inductances and junctions areas. We have compared this ratchet array with other circular arrays. We find experimentally and numerically that the depinning current depends on the direction of the applied current in our ratchet ring. We also find other properties of the depinning current versus applied field, such as a long period and a lack of reflection symmetry, which we can explain analytically.

to be published in PRE

References in corpus (4)

• Reducing vortex density in superconductors using the ratchet effect
• Ratchet Effect in Surface Electromigration: Smoothing Surfaces by an ac Field
• Ratchet potential for fluxons in Josephson-Junction arrays
• Soliton pinning by long-range order in aperiodic systems

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