Surface Phason-Polaritons in Charge Density Wave Films

Details Surface Phason-Polaritons in Charge Density Wave Films Surface Phason-Polaritons in Charge Density Wave Films

1997-08-04

arxiv.org/abs/cond-mat/9708019v1

Physics

Condensed Matter

Latex2e, 18 pages, to be published in J. Phys. Chem. Solids

Scientific paper

10.1016/S0921-4526(97)00467-5

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.

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