Summary
In this chapter we examine first a system consisting of two “impurities” embedded in a periodic tight-binding model (TBM). This prepares the way for the approximate treatment of a disordered system containing a nonzero concentration of impurities. We examine in particular the average DOS, which depends on the average Green’s function, 〈G〉. For the calculation of the latter, various approximation methods are employed; prominent among them is the so-called coherent potential approximation (CPA).
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Chapter 7
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(2006). Two or More Impurities; Disordered Systems. In: Green’s Functions in Quantum Physics. Springer Series in Solid-State Sciences, vol 7. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-28841-4_7
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