Planar force-constant method for lattice dynamics of cubic InN

Using the density-functional theory within the full-potential linear augmented plane-wave (FP-LAPW) method, we have calculated, in this work, the equation of state and the phonon dispersion along [100] and [111] directions for the cubic Indium Nitride (c-InN), including hydrostatic strains dependence. A good agreement with the micro-Raman scattering experiment is obtained for the phonon modes at Γ. Our results show that the apparent divergence between the known experimental results is a consequence of hydrostatic effects on the sample due to differences of the used Raman methods.