Calculation of Shockley and Tamm states for a one-dimensional lattice using Green's-function theory

Abstract

The surface-state energy levels associated with a semi-infinite linear chain of atoms with two atomic orbitals have been investigated using the Green's-function formalism of Kalstein and Soven. We have made a systematic study of the dependence of the energies of both Shockley and Tamm surface states and their existence condition on parameters such as the hopping integral and the surface-potential perturbation.