Abstract
We present simulations of underdamped classical Josephson arrays in the presence of a magnetic field corresponding to f=1/2 flux quanta per unit cell. We show that the current-voltage characteristics exhibit two distinct regimes. At low voltages, the dynamics are dominated by the motion of the vortex superlattice. At high voltages the dynamics are determined by the breakdown of the individual junctions in the direction of current flow. A rich dynamics is found in the low-voltage region, exhibiting periodic, bifurcating, and complex chaotic solutions. We also present a mechanical analog of the system which helps one to understand the essential features of the simulated dynamics.
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