Short-range order effects on the electronic properties of a binary linear chain

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Abstract
A new technique to treat one-dimensional binary alloys, described in tight-binding approximation, capable of incorporating short-range correlations in a simple way is presented. The method is an extension of work by Faulkner and Korringa and handles spatial correlations by restricting the number of allowed configurations in the ensemble over which averages are taken. The density of electron states thus calculated exhibits rich structure, which is known to exist but is lost in treatments which neglect local correlation effects. A detailed study of the stoichiometric case with an equal number of atoms of both chemical species is presented, including up to next-nearest-neighbor correlations.