Pseudogaps in the 2D Hubbard model

We study the pseudogaps in the spectra of the 2D Hubbard model using both finite-size and dynamical cluster approximation (DCA) quantum Monte Carlo calculations. At half-filling, 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. At finite doping. a divergent d-wave pair susceptibility is observed.