Surface losses and self-pumping effects in a long Josephson junction: A semianalytical approach

Marek Jaworski

doi:10.1103/PhysRevB.81.224517

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Surface losses and self-pumping effects in a long Josephson junction: A semianalytical approach

Marek Jaworski

DOI 10.1103/PhysRevB.81.224517 · Physical Review B

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Abstract

The flux-flow dynamics in a long Josephson junction is studied both analytically and numerically. A realistic model of the junction is considered by taking into account a nonuniform current distribution, surface losses, and self-pumping effects. An approximate analytical solution of the modified sine-Gordon equation is derived in the form of a unidirectional dense fluxon train accompanied by two oppositely directed plasma waves. Next, some macroscopic time-averaged quantities are calculated making possible to evaluate the current-voltage characteristic of the junction. The results obtained by the present method are compared with direct numerical simulations both for the current-voltage characteristics and for the loss factor modulated spatially due to the self-pumping. The comparison shows very good agreement for typical junction parameters but indicates also some limitations of the method.