Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition

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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 $z=2$.
Revised version to be published in JETP Letters

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Superconductivity, Statistical Mechanics

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http://salesiana.dossiersoluciones.com/handle/123456789/148680

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/9611177
 http://arxiv.org/abs/cond-mat/9611177

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arXiv