On the augmented-space cluster coherent-potential approximation and its analytic properties
作者： S S A Razee , A Mookerjee , R Prasad
DOI: 10.1088/0953-8984/3/19/008
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摘要: The authors discuss the analytic properties of configuration-averaged Green function obtained using self-consistent cluster coherent-potential approximation, developed in augmented-space formalism. It is shown that iteration scheme for self-energy always convergent to a unique value, which bounded and herglotz, provided one starts off with herglotz guess. This ensures shall get unique, non-negative density states at all energies.
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