Pseudogaps in the 2D half-filled Hubbard model

Details Pseudogaps in the 2D half-filled Hubbard model Pseudogaps in the 2D half-filled Hubbard model

1999-10-15

arxiv.org/abs/cond-mat/9910226v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, revtex

Scientific paper

We study the pseudogaps in the spectra of the half-filled 2D Hubbard model using both finite-size and dynamical cluster approximation (DCA) quantum Monte Carlo calculations. A charge pseudogap, accompanied by non-Fermi liquid behavior in the self energy, is shown to persist in the thermodynamic limit. The DCA (finite-size) method systematically underestimates (overestimates) the width of the pseudogap. A spin pseudogap is not seen at half-filling.

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