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Quasi one-dimensional conductors which undergo a Peierls transition to acharge density wave state at a temperature T_P show a region of one-dimensionalfluctuations above T_P. The Ginzburg-Landau-Langevin theory for the frequencydependent collective conductivity from conductive fluctuations into the chargedensity wave state is developed. By inclusion of a phase breaking term theeffect of local pinning due to random impurities is simulated. It is found thatthe spectral weight of unpinned fluctuations is partly redistributed into apinned mode around a pinning frequency in the far infrared region. In addition,selection rule breaking by the imputities makes the fluctuating amplitude modevisible in the optical response.Comment: 17 pages, 1 figure, to appear in J. Phys. C: Condensed Matte

Alternating-current conductivity of pinned charge-density-wave fluctuations in quasi-one-dimensional conductors