Model Calculations for Electrons in Amorphous Structures with Short‐Range Order

The distribution of poles of the averaged one‐electron Green's function in the complex k ‐space has been investigated for a simple model consisting of point scatterers which form a slightly distorted primitive cubic lattice without long‐range order. For energies within the energy band of the corresponding crystal the poles of the amorphous case are found to represent “quasi‐crystal electrons” which, for small disorder, may be classified in a sense by a k ‐vector, while for energies near the crystal band edges (inside or outside the crystal band) the states are no longer comparable with crystalline states.