AC-Conductivity of Pinned Charge Density Wave Fluctuations in Quasi One-Dimensional Conductors
W. Wonneberger
Abstract
Quasi one-dimensional conductors which undergo a Peierls transition to a charge density wave state at a temperature TP show a region of one-dimensional fluctuations above TP. The Ginzburg-Landau-Langevin theory for the frequency dependent collective conductivity from conductive fluctuations into the charge density wave state is developed. By inclusion of a phase breaking term the effect of local pinning due to random impurities is simulated. It is found that the spectral weight of unpinned fluctuations is partly redistributed into a pinned mode around a pinning frequency in the far infrared region. In addition, selection rule breaking by the imputities makes the fluctuating amplitude mode visible in the optical response.
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