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  • Title: Thermally fluctuating superconductors in two dimensions.
    Author: Sachdev S, Starykh OA.
    Journal: Nature; 2000 May 18; 405(6784):322-5. PubMed ID: 10830955.
    Abstract:
    In many two-dimensional superconducting systems, such as Josephson-junction arrays, granular superconducting films, and the high-temperature superconductors, it appears that the electrons bind into Cooper pairs below a pairing temperature (T(P)) that is well above the Kosterlitz-Thouless temperature (T(KT)) the temperature below which there is long-range superconducting order). The electron dynamics at temperatures between T(KT) and T(P) involve a complex interplay of thermal and quantum fluctuations, for which no quantitative theory exists. Here we report numerical results for this region, by exploiting its proximity to a T = 0 superconductor-insulator quantum phase transition. This quantum critical point need not be experimentally accessible for our results to apply. We characterize the static, thermodynamic properties by a single dimensionless parameter, gamma(T). Quantitative and universal results are obtained for the frequency dependence of the conductivity, which are dependent only upon gamma(T) and fundamental constants of nature.
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