DYNAMICAL TRANSITION IN SLIDING CHARGE-DENSITY WAVES WITH QUENCHED DISORDER

We have studied numerically the dynamics of sliding charge-density wav es (CDW's) in the presence of impurities in d=1,2. The model considere d exhibits a first-order dynamical transition at a critical driving fo rce F-c between ''rough'' (disorder dominated) (F<F-c) and ''flat'' (F >F-c) sliding phases where disorder is washed out by the external driv e. The effective model for the sliding CDW's in the presence of impuri ties can be mapped onto that of a magnetic flux line pinned by columna r defects and tilted by an applied field. The dynamical transition of sliding CDW's corresponds to the transverse Meissner effect of the til ted flux line.