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

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

1999-01-26

arxiv.org/abs/cond-mat/9901281v1

Physics

Condensed Matter

17 pages, 1 figure, to appear in J. Phys. C: Condensed Matter

Scientific paper

10.1088/0953-8984/11/12/018

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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