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The Electronic Structure of the Copper Oxide Plane within the Green's Functions Projection Method
Author(s) -
Hayn R.,
Yu. Yushankhai V.
Publication year - 1991
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221660211
Subject(s) - copper , transition metal , projection (relational algebra) , condensed matter physics , mathematics , projection method , metal , mathematical analysis , oxide , electronic structure , physics , chemistry , geometry , algorithm , biochemistry , organic chemistry , grating , catalysis
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 .