Abstract
Abstract A classical model is applied that describes charge transport by pinned and depinned charge density waves (CDW). At low frequency, charge is assumed to be displaced in a potential that is the sum of strong end and weak distributed potentials. In this range the CDW may be treated as a damped harmonic oscillator. Above a critical force the CDW is depinned and moves with resistance from viscous damping and dry friction. By taking the forces of standing and dry sliding friction to be equal and assuming an exponential distribution of coherent CDW regions we obtain the reported form of current vs applied field. By assuming the CDW's to be overdamped we fit the observed frequency-dependent conductivity. We calculate the effect of a dc field on the ac conductivity and the effect on the dc conductivity of large amplitude ac fields. We apply the classical model to an analysis of CDW noise and suggest the excitation of phase modes to be the origin of the observed narrow band noise components.
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