Radiation linewidth of a long Josephson junction in the flux-flow regime

Details Radiation linewidth of a long Josephson junction in the flux-flow regime Radiation linewidth of a long Josephson junction in the flux-flow regime

1996-05-15

arxiv.org/abs/cond-mat/9605097v1

Physics

Condensed Matter

11 pages LaTeX, to appear in Phys Rev B

Scientific paper

Theoretical model for the radiation linewidth in a multi-fluxon state of a long Josephson junction is presented. Starting from the perturbed sine-Gordon model with the temperature dependent noise term, we develop a collective coordinate approach which allows to calculate the finite radiation linewidth due to excitation of the internal degrees of freedom in the moving fluxon chain. At low fluxon density, the radiation linewidth is expected to be substantially larger than that of a lumped Josephson oscillator. With increasing the fluxon density, a crossover to a much smaller linewidth corresponding to the lumped oscillator limit is predicted.

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