Abstract
We present results of first-principles calculations concerning structural, dielectric, and lattice-dynamical properties of strained GaN and AlN in wurtzite structure. In particular, we consider the symmetry-conserving biaxial strain along the c-axis. Its influence on the lattice parameters, the dielectric constants, the dynamical effective charges, and the phonon frequencies is studied in detail. In addition, we investigate the variation of the dielectric and lattice-dynamical properties with the internal strain.
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