FREQUENCY AND ELECTRIC FIELD DEPENDENT TRANSPORT DUE TO CHARGE DENSITY WAVE CONDENSATES(EXPERIMENTS ON MX_3 COMPOUNDS, International Symposium on NONLINEAR TRANSPORT AND RELATED PHENOMENA IN INORGANIC QUASI ONE DIMENSIONAL CONDUCTORS)

Abstract

Frequency and field dependent transport phenomena associated with charge density wave (CDW) condensates are summarized. Both the ω and E dependent response point to weakly pinned condensates where the characteristic pinning energies are orders of magnitude smaller than the single particle energies. Both classical and quantum description of the CDW dynamics reproduce the main qualitative features of the field and frequency dependent conductivity and dielectric constant, the relation between the parameters which characterize the frequency and field dependent response, and also describe a broad range of experiments which are performed in the presence of joint ac and dc driving fields. Early (unsuccessful) attempts to obtain phonon assisted tunneling and related quantum phenomena are also summarized, together with possible reasons for the failure of such experiments.