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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 $ω_ξ\proptoξ^{-z}$ with a dynamic exponent $z=2$.

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Karl-Heinz Wagenblast, Rosario Fazio. 1998-08-17. Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition. https://arxiv.org/abs/cond-mat/9611177

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