Plasmon-Optical Phonon Coupled Modes Localized at Interface between Ionic Crystal and Degenerate Semiconductor

Abstract

Coupled modes of surface optical phonons in an ionic crystal and surface plasmons in a semiconductor are studied when the two surfaces are brought close to each other. Dispersion relations of the two coupled modes are derived by making use of local dielectric functions in which the retardation is taken into account. A numerical example is shown for a CsBr–InAs system.