Abstract
Using Langevin dynamics, we have investigated the dynamics of vortices in a disordered two-dimensional superconductor subjected to a uniform driving current. The results provide direct numerical evidence for a dynamical phase transition between a plastic flow regime and a moving ``hexatic glass.'' The simulated current-voltage characteristics are in excellent agreement with recent transport measurements on amorphous ${\mathrm{Mo}}_{77}{\mathrm{Ge}}_{23}$ thin film superconductors.
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