Fluxon bunching in supercurrent-coupled Josephson junctions

Niels Gro/nbech-Jensen; Peter S. Lomdahl; Mogens R. Samuelsen

doi:10.1103/PhysRevB.48.6353

← Back to search

Fluxon bunching in supercurrent-coupled Josephson junctions

Niels Gro/nbech-Jensen, Peter S. Lomdahl, Mogens R. Samuelsen

DOI 10.1103/PhysRevB.48.6353 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

We investigate analytically and numerically the interaction between fluxons of different Josephson junctions coupled through Cooper-pair tunneling. We find that the supercurrent interaction gives rise to attraction between fluxons regardless of their polarity, although fluxons of different polarity are found to interact with a binding energy of an order of magnitude larger than between unipolar fluxons. When bias current is applied to a system of two coupled junctions we can analytically evaluate the range in the difference of the bias currents for which fluxons are bound. The differences in interaction between fluxons of equal and opposite polarity are discussed. Numerical simulations of coupled sine-Gordon equations agree very well with the analytical predictions.