Anomalous finite-size effect in superconducting Josephson junction arrays.
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.
Chen
Q H
QH
Department of Physics, Hong Kong Baptist University, Kowloon Tong, Hong Kong.
Tang
L H
LH
Tong
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