OPTICAL-PHONON CONFINEMENT AND SCATTERING IN WURTZITE HETEROSTRUCTURES

We investigate Frohlich-like electron-optical-phonon interactions in w urtzite structures with single and double heterointerfaces based on th e macroscopic dielectric continuum model and the uniaxial model. In ad dition to confined (for the case of double interfaces), interface, and half:space optical phonon modes as expected from the analogy with zin c-blende structures, propagating modes may exist in wurtzite heterosys tems due to anisotropic phonon dispersion. This is especially the case when the dielectric properties of the adjacent heterostructure materi als do not differ substantially. The dispersion relations and the inte raction Hamiltonians for each of these modes are derived.