Critical dynamics of the three-dimensional elastic model for pinned charge-density waves.

We study numerically the dynamical equilibrium behavior for a uniformly-driven, elastic model for pinned Charge-Density Waves (CDW), in the critical region close to the threshold field for sliding, in two and three dimensions. We obtain a critical exponent for the mean velocity in agreement with recent experiments, and scaling for the velocity-velocity correlation function, from which we extract a diverging correlation length. The correlation length exponent v is found to be less than 2/d, suggesting unusual critical behavior for this random field model.