ONE-ELECTRON SPECTRAL WEIGHT OF THE DOPED 2-DIMENSIONAL HUBBARD-MODEL

We have calculated the single-particle density of states N(omega) and the spectral weight A(p,omega) for the doped two-dimensional Hubbard m odel by combining quantum Monte Carlo simulations with the maximum-ent ropy analytic continuation technique. We present results for various v alues of the doping, temperature, and Coulomb repulsion U. For suffici ently strong Coulomb repulsions and near half filling, a Mott-Hubbard pseudogap exists. In this case, we find that a peak develops at the to p of the lower Hubbard band near the Fermi level at temperatures of or der the hopping t. The structure of this peak is similar to that seen in the infinite-dimensional Hubbard model.