Self-Consistent Average Green's Function in Random Lattices: A Generalized Coherent-Potential Approximation ( n ) and Its Diagrammatic Equivalents
Bernie G. Nickel, JAMES A. KRUMHANSL · Physical review. B, Solid state · 1971
We describe a simple generalization of the coherent-potential approximation that is exactly equivalent to the self-contained cumulant expansions and the self-consistent diagrammatic-resummation techniques. A detailed analysis of these different methods for the pair case is given.