Commensurability in One Dimension and the Josephson Junction Ladder

Details Commensurability in One Dimension and the Josephson Junction Ladder Commensurability in One Dimension and the Josephson Junction Ladder

1997-11-06

arxiv.org/abs/cond-mat/9711049v1

Physics

Condensed Matter

Statistical Mechanics

22 pages, 10 eps figures, REVTEX, better version of Fig. 9 (3 Mb) available from colin@thphys.ox.ac.uk

Scientific paper

We study a Josephson junction ladder in a magnetic field in the absence of charging effects via a transfer matrix formalism. The eigenvalues of the transfer matrix are found numerically, giving a determination of the different phases of the ladder. The spatial periodicity of the ground state exhibits a devil's staircase as a function of the magnetic flux filling factor f. If the transverse Josephson coupling is varied a continuous superconducting-normal transition in the transverse direction is observed, analogous to the breakdown of the KAM trajectories in dynamical systems. We also examine how these properties may be affected by a current injected along the ladder.

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