On the augmented-space cluster coherent-potential approximation and its analytic properties
- 13 May 1991
- journal article
- Published by IOP Publishing in Journal of Physics: Condensed Matter
- Vol. 3 (19) , 3301-3310
- https://doi.org/10.1088/0953-8984/3/19/008
Abstract
The authors discuss the analytic properties of the configuration-averaged Green function obtained using the self-consistent cluster coherent-potential approximation, developed in the augmented-space formalism. It is shown that the iteration scheme for the self-energy is always convergent to a unique value, which is bounded and herglotz, provided one starts off with a bounded and herglotz guess. This ensures that one shall always get a unique, non-negative density of states at all energies.Keywords
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