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Decoupling approach for the Hubbard model
Author(s) -
Gehlhoff L.
Publication year - 1996
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.2221930216
Subject(s) - decoupling (probability) , hubbard model , degeneracy (biology) , limit (mathematics) , physics , equations of motion , mathematical physics , statistical physics , quantum mechanics , mathematics , mathematical analysis , superconductivity , engineering , bioinformatics , control engineering , biology
The U = ∞ one‐band Hubbard model with large spin degeneracy N formulated with X operators is considered. The single‐particle Green's function is determined by applying the equation‐of‐motion method and a decoupling approach which is exact in the large‐ N limit.