Noise self-pumping in long Josephson junctions
Andrey L. Pankratov
DOI 10.1103/PhysRevB.78.024515 · Physical Review B
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Abstract
The noise self-pumping effect in a spatially extended system modeled by a sine-Gordon equation is investigated. This effect is realized in a similar fashion as usual ac self-pumping effect in long Josephson junctions: fluctuating solitons, radiating from the junction, induce fluctuating magnetic field, which in turn modulates the dynamics of the soliton chain, and increases the spectral linewidth. Contrary to the theory for short Josephson junctions, predicting linear decrease in the spectral linewidth with increase in junction length, the minimum of the linewidth versus the length is observed both for uniform and nonuniform bias feed distributions.
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