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AC-Conductivity of Pinned Charge Density Wave Fluctuations in Quasi One-Dimensional Conductors

W. Wonneberger
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Abstract

Quasi one-dimensional conductors which undergo a Peierls transition to a charge density wave state at a temperature T_P show a region of one-dimensional fluctuations above T_P. 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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W. Wonneberger. 1999-01-26. AC-Conductivity of Pinned Charge Density Wave Fluctuations in Quasi One-Dimensional Conductors. https://doi.org/10.1088/0953-8984%2F11%2F12%2F018

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