Premium
A decoupling procedure for green functions: Test at the ising model and application to an extended hubbard model
Author(s) -
Ihle D.,
Lorenz B.
Publication year - 1973
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.2220600135
Subject(s) - decoupling (probability) , formalism (music) , hubbard model , ising model , phase diagram , statistical physics , physics , square lattice ising model , mathematics , quantum mechanics , phase (matter) , superconductivity , engineering , control engineering , art , musical , visual arts
A decoupling procedure for the double‐time three‐particle Green functions is presented. The formalism is tested at the spin ½ nearest‐neighbour interaction Ising model yielding more accurate results than Bethe's first approximation. The decoupling procedure is applied to the problem of electron‐charge ordering on the basis of an extended Hubbard model investigated by Bari, the corresponding phase diagram being calculated.