A planar force-constant model for phonons in wurtzite GaN and AlN: Application to hexagonal GaN/AlN superlattices

摘要

A planar force-constant model is developed for longitudinal phonons ofwurtzite GaN and AlN propagating along the [0001] direction. The proposed modelis then applied to the study of the phonon modes in hexagonal GaN/AlNsuperlattices in the longitudinal polarization. The confinement of thesuperlattice phonon mode is discussed.