ELECTRONIC-PROPERTIES OF THE INSULATING HALF-FILLED HUBBARD-MODEL

Monte Carlo results for the frequency dependent conductivity sigma1(om ega), the angular resolved photoemission spectral weight A(p,omega), a nd the electron momentum distribution [n(p)] are calculated for a half -filled Hubbard model with the on-site Coulomb interaction U equal to the bandwidth 8t. We find that even for U = 8t, a spin-density-wave ap proximation provides a sensible description of this data and hence a u seful picture of the electronic degrees of freedom in the insulating s tate.