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.
Cite
@article{arxiv.cond-mat/9910226,
title = {Pseudogaps in the 2D half-filled Hubbard model},
author = {C. Huscroft and M. Jarrell and Th. Maier and S. Moukouri and A. N. Tahvildarzadeh},
journal= {arXiv preprint arXiv:cond-mat/9910226},
year = {2007}
}