Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition
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-z with a dynamic exponent z=2.
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