Lattice dynamics of GaN/AlN superlattices

Phonon dispersion curves of cubic (001)-(GaN)n/(AlN)n (n=1–4) superlattices for various propagating directions are calculated. Short-range interactions up to the second-nearest neighbors are described by using a two-parameter Keating model, and the long-range Coulomb interactions are included via an Ewald summation. Raman spectra are calculated by a bond-polarizability model. The confinement of optical modes is discussed. The anisotropies of the zone-center optical phonons are investigated.

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