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Coupled cluster approach to the single‐particle Green's function
Author(s) -
Nooijen Marcel,
Snijders Jaap G.
Publication year - 1992
Publication title -
international journal of quantum chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.484
H-Index - 105
eISSN - 1097-461X
pISSN - 0020-7608
DOI - 10.1002/qua.560440808
Subject(s) - diagrammatic reasoning , cluster (spacecraft) , coupled cluster , function (biology) , particle (ecology) , physics , green's function , statistical physics , mathematical physics , quantum mechanics , computer science , molecule , oceanography , evolutionary biology , biology , programming language , geology
Diagrammatic and Coupled Cluster techniques are used to develop an approach to the single‐particle Green's function G which concentrates on G directly rather than first approximating the irreducible self‐energy and then solving Dyson's equation. As a consequence the ionization and attachment parts of the Green's function satisfy completely decoupled sets of equations. The proposed Coupled Cluster Green's Function method ( CCGF ) is intimately connected to both Coupled Cluster Linear Response Theory ( CCLRT ) and the Normal Coupled Cluster Method ( NCCM ). These relations are discussed in detail. © 1992 John Wiley & Sons, Inc.