Year: 2003
Type: article
Abstract: The dynamic response of two-dimensional Josephson junction arrays close to, but above the Berezinskii-Kosterlitz-Thouless (BKT) transition temperature is described in terms of the vortex dielectric function $\ensuremath{\epsilon}(\ensuremath{\omega})$ and the flux noise spectrum ${S}_{\ensuremath{\varphi}}(\ensuremath{\omega}).$ They are calculated by considering both the contributions of free vortices interacting through a screened Coulomb potential and the pair motion of vortices that are closer to each other than the BKT correlation length. This procedure allows us to understand various anomalous features in $\ensuremath{\epsilon}(\ensuremath{\omega})$ and in ${S}_{\ensuremath{\varphi}}(\ensuremath{\omega})$ that have been observed both experimentally and in dynamic simulations.
Authors: Md. Ashrafuzzaman, Massimiliano Capezzali, Hans Beck
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1970875381