Anomalous Finite-Size Effect in Superconducting Josephson Junction Arrays
Qing-Hu Chen, Lei-Han Tang, Peiqing Tong
DOI 10.1103/PhysRevLett.87.067001 · Physical Review Letters
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Abstract
We show that a previously reported discrepancy between simulations of superconducting Josephson junction arrays and the theoretical analysis of Ambegaokar, Halperin, Nelson, and Siggia (AHNS) [Phys. Rev. Lett. 40, 783 (1978)] is rooted in a peculiar finite-size effect under periodic boundary conditions. Our simulation results for the largest array support the power-law I−V curves predicted by AHNS. Analysis of the vortex dynamics reveals two intrinsic length scales set by the applied current, which define three size regimes with distinctive I−V characteristics.
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