Study of electrical frequency response through the metal-insulator transition in highly conducting polymers

A random resistor network (RRN) is used to study the electrical frequency response, including the unusual frequency dependent conductivity and multiple zero crossing of the dielectric function of highly conducting polymers. The negative values of epsilon and the low-energy structure of conducting polymers are described using RRN model and the calculated epsilon(omega) and sigma(omega) reproduce the main features of recent broadband optical experiments.