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cond-mat1994
The wavefunction renormalization constant for the one- and two- band Hubbard hamiltonians in two dimensions
E. Louis, G. Chiappe, J. Galan +2
The wavefunction renormalization in the Hubbard model is studied, by using well tested mean field tecniques. The 'orthogonality catastrophe' is shown to exist, even in 2D, for dopi…
cond-mat1994
Hartree Fock and RPA studies of the Hubbard model
F. Guinea, E. Louis, J. A. Verges
The applicability of the Hartree-Fock and random phase approximations to models of strongly correlated electrons is discussed. The 2D Hubbard model is analyzed. An antiferromagneti…