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Theory of the excitation spectrum of nondiagonal disordered systems
Author(s) -
Onipko A. I.
Publication year - 1979
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560160313
Subject(s) - excitation , spectrum (functional analysis) , k nearest neighbors algorithm , physics , matrix (chemical analysis) , function (biology) , resonance (particle physics) , energy spectrum , chemistry , quantum mechanics , computer science , chromatography , artificial intelligence , evolutionary biology , biology
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.