Abstract
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 response. At finite temperatures, quasi-particles are thermally excited. Their dissipation leads to polariton damping. Significant level shifts of surface phason-polaritons and guided wave modes are also found. They are due to thermal dressing of the longitudinal optical phason via quasi-particles. The zero and finite temperature results including the case of neglected retardation are displayed in detail.
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