The Electronic Structure of the Copper Oxide Plane within the Green's Functions Projection Method
1991; Wiley; Volume: 166; Issue: 2 Linguagem: Inglês
10.1002/pssb.2221660211
ISSN1521-3951
Autores Tópico(s)Surface and Thin Film Phenomena
ResumoAbstract The projection method for two‐time Green functions is used to derive a self‐consistent set of equations for the spectrum of the two‐dimensional Emery model with infinite copper correlation. In the relevant parameter region near the filling n = 1 a charge‐transfer gap is found, but in difference to the Gutzwiller approximation a finite bandwidth occurs at the transition point. The critical Δ c = ϵ p — ϵ d at which the transition to metallic behaviour occurs is found to be approximately Δ c = 2 t .
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