DYNAMICS OF UNDERDAMPED JOSEPHSON ARRAYS IN A MAGNETIC-FIELD

We present simulations of the dynamics of underdamped classical Joseph son arrays for values of the flux quanta per unit cell f=1/2. We find the dynamics of this system to be quite rich. The I-V characteristics are found to have two distinct regime as the damping is increased. At low voltages the current-voltage characteristics exhibit a regime whic h we characterize as flux-flow-like since it is dominated by the motio n of the vortex superlattice. This regime may exhibit chaotic-like beh avior as the damping parameter is increased. At high voltages the char acteristics jump to an ohmic-like state in which the junctions are all oscillating. We present a potential model which is quite useful in un derstanding the dynamics of the system.