Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition

Details Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition Flux Noise near the Berezinskii-Kosterlitz-Thouless Transition

1996-11-22

arxiv.org/abs/cond-mat/9611177v2

Physics

Condensed Matter

Superconductivity

Revised version to be published in JETP Letters

Scientific paper

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 $\omega_\xi\propto\xi^{-z}$ with a dynamic exponent $z=2$.

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