Enhanced fluxon transmission through impurities

Abstract

Fluxon transmission through several impurities of different strength and type (i.e., microshorts and microresistors), placed in a long Josephson junction is investigated. Threshold pinning current on the impurities is computed as a function of the distance between them, their amplitudes and the dissipation parameter. It is shown that in the case of consequently placed microshorts or microresistors, the threshold pinning current exhibits a clear minimum as a function of the distance between the impurities. In the case of a microresistor, followed by a microshort, an opposite phenomenon is observed, namely the threshold pinning current exhibits maximum as a function of the distance between the impurities. PACS. 03.75.Lm Josephson vortices -05.45.Yv Solitons -74.50.+r Josephson effect

Current distribution of collective thermal depinning of Josephson vortices in naturally stacked Josephson junctions

“…6 The control of the JV motion by this microresistor-type pinning potential, once suggested in a Josephson transmission line, [12][13][14] can also be adopted to realize JV qubits. 3,15 The presence of the edge-pinning potential is confirmed by the oscillatory magnetoresistance of a moving JV lattice ͑see the lower inset of Fig.…”