Abstract
An extended Fukuyama-Lee-Rice theory of phason dynamics in quasi-one-dimensional charge and spin density wave systems is used to calculate the a.c. response of pinned incommensurate density waves for spatial dimensionality d=2, e.g., in thin films. Special attention is paid to descreening effects at low temperatures and to the relaxation mode. They result from coupling of density wave fluctuations to the frequency-dependent longitudinal response of the quasi-particles via random impurity phase pinning. The cases of weak and strong pinning are considered within self-consistent approximations to the pinning problem. Phason self-energy function are evaluated and results for measurable response quantities including the phason transport relaxation times are presented and discussed. By a comparison with experimental data on a.c. conductivities in a wide range of frequencies, it is found that d = 2 phason dynamics is appropriate to o-TaS 3 below the lock-in transition.
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