Abstract
Transport phenomena of charge density waves and flux line lattices under quenched randomness are investigated based on the three-dimensional driven random-field XY model at zero temperature. We pay special attention to the role of topological defects, vortex loops, and find that loops are bounded in small region and its number density decreases exponentially with the driving force in relatively high velocity regime. That is, the system behaves as in thermal equilibrium state at temperature proportional to the inverse of the driving force.
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