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Depinning of kinks in a Josephson-junction ratchet array

2000; American Physical Society; Volume: 61; Issue: 3 Linguagem: Inglês

10.1103/physreve.61.2257

1538-4519

E. Trı́as, J. J. Mazo, F. Falo, T. P. Orlando,

Ecosystem dynamics and resilience

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.