Europhys. Lett.
Volume 65, Number 1, January 2004
Page(s) 68 - 74
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 December 2003
Europhys. Lett., 65 (1) , pp. 68-74 (2004)
DOI: 10.1209/epl/i2003-10042-2

Optical conductivity of a quasi-one-dimensional system with fluctuating order

L. Bartosch

Institut für Theoretische Physik, Universität Frankfurt Robert-Mayer-Str. 8, Postfach 111932, 60054 Frankfurt, Germany

(Received 18 August 2003; accepted 20 October 2003)

We describe a formally exact method to calculate the optical conductivity of a one-dimensional system with fluctuating order. For classical phase fluctuations we explicitly determine the optical conductivity by solving two coupled Fokker-Planck equations numerically. Our results differ considerably from perturbation theory and, in contrast to Gaussian order parameter fluctuations, show a strong dependence on the correlation length.

71.23.-k - Electronic structure of disordered solids.
71.45.Lr - Charge-density-wave systems.
72.80.-r - Conductivity of specific materials.

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