Fluxon mobility in an array of asymmetric superconducting quantum interference devices

Yaroslav Zolotaryuk; Ivan O. Starodub

doi:10.1103/PhysRevE.91.013202

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Fluxon mobility in an array of asymmetric superconducting quantum interference devices

Yaroslav Zolotaryuk, Ivan O. Starodub

DOI 10.1103/PhysRevE.91.013202 · Physical Review E

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Abstract

Fluxon dynamics in the dc-biased array of asymmetric three-junction superconducting quantum interference devices (SQUIDs) is investigated. The array of SQUIDs is described by the discrete double sine-Gordon equation. It appears that this equation possesses a finite set of velocities at which the fluxon propagates with the constant shape and without radiation. The signatures of these velocities appear on the respective current-voltage characteristics of the array as inaccessible voltage intervals (gaps). The critical depinning current has a clear minimum as a function of the asymmetry parameter (the ratio of the critical currents of the left and right junctions of the SQUID), which coincides with the minimum of the Peierls-Nabarro potential.