Fluxon bunching in supercurrent-coupled Josephson junctions

Niels Grønbech-Jensen, Peter S. Lomdahl, Mogens Rugholm Samuelsen

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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.
Original languageEnglish
JournalPhysical Review B
Volume48
Issue number9
Pages (from-to)6353-6359
ISSN2469-9950
DOIs
Publication statusPublished - 1993

Bibliographical note

Copyright (1993) by the American Physical Society.

Keywords

  • SYSTEMS
  • CHAINS
  • SOLITON OSCILLATORS
  • DYNAMICS
  • SINE-GORDON EQUATION

Cite this

Grønbech-Jensen, N., Lomdahl, P. S., & Samuelsen, M. R. (1993). Fluxon bunching in supercurrent-coupled Josephson junctions. Physical Review B, 48(9), 6353-6359. https://doi.org/10.1103/PhysRevB.48.6353