Abstract
We study the response of an array of underdamped classical Josephson functions when the phase configuration contains precisely one vortex. We first simulate the linear response of arrays to a small oscillating current and find, as a function of frequency, a well-defined resonance apart from the single-function resonance. When a dc current is applied, in addition to the small ac current, the resonance is seen to split into two separate peaks. Next, we analyze the full set of evolution equations and show that the response of the array under these conditions is represented very well by a set of three linear equations
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