Electronic States in Perturbed Two-Dimensional Graphite Lattice

Abstract

By using a network model, the effects on the band structure of two-dimensional graphite due to localized perturbations are studied. The density of states near the Fermi energy is considerably modified by such perturbations. In the case of attractive perturbation, the density of states above the Fermi energy is increased and the density of states below the Fermi energy is slightly decreased. In the case of repulsive perturbation, the reverse is the case.