Fluxon dynamics in three stacked Josephson junctions

C. Gorria; P. L. Christiansen; Yu. B. Gaididei; V. Muto; N. F. Pedersen; M. P. Soerensen

doi:10.1103/PhysRevB.66.172503

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Fluxon dynamics in three stacked Josephson junctions

C. Gorria, P. L. Christiansen, Yu. B. Gaididei, V. Muto, N. F. Pedersen, M. P. Soerensen

DOI 10.1103/PhysRevB.66.172503 · Physical Review B

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Abstract

The motion of fluxons of the same polarity in three vertically stacked Josephson junctions is studied. In this configuration the difference between exterior and interior junctions plays a more important role than in other configurations with several interior junctions. Below the Swihart velocity c−, the coupling between junctions leads to a repulsion of the fluxons with the same polarity. Above this critical velocity a fluxon will induce radiation in the neighboring junctions, leading to a bunching of the fluxons in the stacked junctions. Using the Sakai-Bodin-Pedersen model, three coupled perturbed sine-Gordon equations are numerically studied for different values of coupling, damping, and bias parameters. In a narrow range of velocities bunching occurs. Outside this interval the fluxons split and new fluxons may be created. I−V characteristics are presented.