The effect of the surface termination on force constants and dispersion curves

Abstract

The Born-von Kármán model introduced in the previous Chapter, is used to illustrate how the invariance properties of the total energy, the equilibrium conditions and the emergence of the surface stress affect the surface force constants in the surface region and the surface phonon dispersion curves. Then the effects of extended surface and interplanar force constant perturbations, which in the case of metals may involve several layers, are discussed.