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Flux noise near the Berezinski\overset{\lower0.5em\hbox{-Kosterlitz-Thouless transition |
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| Authors: | K -H Wagenblast R Fazio |
| Institution: | 1. Institut für Theoretische Festk?rperphysik, Universit?t Karlsruhe, D-76128, Karlsruhe, Germany 2. Istituto di Fisica, Università di Catania, I-95129, Catania, Italy 3. Istituto Nazionale di Fisica della Materia (INFM), Unità di Catania, Italy |
| Abstract: | The flux noise in Josephson junction arrays is studied 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. The flux noise exhibits a crossover from white to 1/f noise at a frequency ωξ∝ξ?z with a dynamic exponent z=2. |
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