ar X iv : c on d - m at / 9 70 80 19 v 1 4 A ug 1 99 7 Surface Phason – Polaritons in Charge Density Wave Films
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چکیده
The coupled non–radiative excitations of the electromagnetic field and pha-sons 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. 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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تاریخ انتشار 1997