On Impurity Pinning of One-Dimensional Charge Density Waves

Abstract

The effect of impurities on the phase mode of CDW in a one-dimensional system is studied by taking account of the non-linearity of the problem. Most of the work is based on numerical simulations which are performed using a classical mechanical equation of motion for the phase mode. The existence of critical field for the pinning and depinning is discussed for weak and strong pinning cases. The ohmic frequency-dependent conductivity is calculated by the Kubo formula. The dc conduction in non-ohmic regime is found to be of activation type, the activation energies decreasing with increase of the applied field.