Abstract
We present numerical simulations of Josephson junction arrays with strong positional disorder. We study their vortex dynamics as a function of disorder and bias current. We find that above the critical current i c there is a plastic flow of vortices and antivortices through channels, characterized by strong fluctuations of the total vorticity. The number and complexity of the vortex-antivortex flow channels grow with bias current like in a critical phenomenon. We study this critical behavior close to ic in the strong disorder limit, calculating critical exponents for the voltage onset and voltage fluctuations.
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