Vortex dynamics in two-dimensional Josephson junction arrays

Details Vortex dynamics in two-dimensional Josephson junction arrays Vortex dynamics in two-dimensional Josephson junction arrays

2002-11-18

arxiv.org/abs/cond-mat/0211372v1

Physical Review B 68, 052502 (2003)

Physics

Condensed Matter

Superconductivity

5 pages, 4 figures

Scientific paper

10.1103/PhysRevB.68.052502

The dynamic response of unfrustrated two-dimensional Josephson junction arrays close to, but above the Kosterlitz-Thouless($KT$) transition temperature is described in terms of the vortex dielectric function $\epsilon(\omega)$. The latter is calculated by considering separately the contribution of $\ll$free$\gg$ vortices interacting by a screened Coulomb potential, and the $\ll$pair motion$\gg$ of vortices that are closer to each other than the $KT$ correlation length. This procedure allows to understand various anomalous features in $\epsilon(\omega)$ and in the flux noise spectra that have been observed experimentally and in dynamic simulations.

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