Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition

Karl-Heinz Wagenblast; Rosario Fazio

arXiv:cond-mat/9611177·cond-mat.supr-con·February 3, 2008

Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition

Karl-Heinz Wagenblast, Rosario Fazio

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Abstract

We study the flux noise in Josephson junction arrays in the critical regime above the Berezinskii-Kosterlitz-Thouless transition. In proximity coupled arrays a local ohmic damping for the phases is relevant, giving rise to anomalous vortex diffusion and a dynamic scaling of the flux noise in the critical region. It shows a crossover from white to $1/ f$ -noise at a frequency $ω_{ξ} \propto ξ^{- z}$ with a dynamic exponent $z = 2$ .

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TopicsGeophysics and Sensor Technology