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Mean‐Field Solution of Strongly Correlated Systems Using Hubbard Atomic Operators. Hubbard Model with Infinite U
Author(s) -
Kotrla M.,
Drchal V.
Publication year - 1990
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.2221570215
Subject(s) - hubbard model , decoupling (probability) , coulomb , equations of motion , mean field theory , magnetic moment , physics , hierarchy , mathematics , quantum mechanics , superconductivity , electron , control engineering , engineering , economics , market economy
The hierarchy of equations of motion for double‐time Green functions for Hubbard atomic operators is solved using moment‐conserving decoupling. The lowest order gives a new type of meanfield solution which depends on nonlocal correlation functions. The case of Hubbard model with infinite Coulomb interaction is studied and magnetic properties of the mean‐field solution are investigated employing an additional approximation for correlation functions.