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Properties of the Ground State in the Hubbard‐Hirsch Model
Author(s) -
Zhong Qiang,
Nie HuiQuan,
Wei GuoZhu
Publication year - 1993
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.2221790118
Subject(s) - hubbard model , ground state , antiferromagnetism , condensed matter physics , phase diagram , coulomb , ferromagnetism , paramagnetism , physics , charge (physics) , mean field theory , coupling (piping) , phase (matter) , quantum mechanics , superconductivity , materials science , metallurgy , electron
Using Bogolyubov's variational principle and the mean‐field theory the properties of the ground state in the Hubbard‐Hirsch model are discussed for weak coupling condition, and the phase diagrams are plotted. It is pointed out that the ground state of the system can be paramagnetic, ferromagnetic, or antiferromagnetic, depending on the intensity of the Coulomb interaction U and the exchange interaction J ; the charge‐ordered phase does not exist.