The coupled non-radiative excitations of the electromagnetic field and phasons in films with a quasi one-dimensional charge density wave (CDW) are evaluated for P--polarization and CDW conducting axis inside the film. The prominent features are two surface phason-polariton branches extending from the CDW pinning frequency to the frequency of the longitudinal optical phason. These surface phason-polariton states are confined to a finite band of longitudinal wave numbers. Besides surface polaritons, infinite series of guided wave modes are found which extend to large wave numbers. These differences to usual phonon-polaritons are caused by the extreme anisotropy of the electric CDW reponse. This new class of surface polaritons is expected to be found in the submillimeter frequency range.
@article{arxiv.cond-mat/9708019,
title = {Surface Phason-Polaritons in Charge Density Wave Films},
author = {W. Wonneberger and R. Lamche},
journal= {arXiv preprint arXiv:cond-mat/9708019},
year = {2009}
}
Comments
Latex2e, 18 pages, to be published in J. Phys. Chem. Solids