Theory of the excitation spectrum of nondiagonal disordered systems

✍ Scribed by A. I. Onipko

• Publisher: John Wiley and Sons
• Year: 1979
• Tongue: English
• Weight: 648 KB
• Volume: 16
• Category: Article
• ISSN: 0020-7608
• DOI: 10.1002/qua.560160313

✦ Synopsis

Abstract

The spectrum of a two‐component solid solution with a nondiagonal disorder is studied in the framework of the average T matrix method. For a one‐dimensional system in the nearest‐neighbor approximation the criteria for the system parameters are given such that at an in‐band resonance, one or two “impurity bands” may be realized, and the corresponding model calculation is performed. In the single‐site approximation an expression of the self‐energy part of a nondiagonal disordered system Green's function is found taking into account multiple occupancy corrections. The possibility of using it to describe a disordered system excitation spectrum and the calculation of state density moments are discussed.