Dynamics of Honeycomb and Triangular Lattices Containing Point Defects

Abstract

The frequencies of localized and resonance modes in the honeycomb lattice are calculated. The effects of change of mass and force-constant due to impurity atom are studied. It is shown that in the case of honeycomb lattices an impurity atom brings about an s-like and two p-like localized modes, while in the case of the triangular lattices an impurity atom produces an s-like, two p-like, two d-like and an f-like modes.