The wavefunction renormalization constant for the one- and two- band Hubbard hamiltonians in two dimensions

Details The wavefunction renormalization constant for the one- and two- band Hubbard hamiltonians in two dimensions The wavefunction renormalization constant for the one- and two- band Hubbard hamiltonians in two dimensions

1994-03-02

arxiv.org/abs/cond-mat/9403007v1

Physics

Condensed Matter

8 pages

Scientific paper

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 doping levels sufficiently close to half filling. The results are extended beyond mean field, by constructing delocalized wavefunctions, with the correct symmetries of the exact solutions. The physics are still well described by the assumption of the existence of the orthogonality catastrophe.

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