ONE-PARTICLE SPECTRAL WEIGHT OF THE 3-DIMENSIONAL SINGLE-BAND HUBBARD-MODEL

Dynamic properties of the three-dimensional single-band Hubbard model are studied using quantum Monte Carlo combined with the maximum entrop y technique. At half-filling, there is a clear gap in the density of s tates and well-defined quasiparticle peaks at the top (bottom) of the lower (upper) Hubbard band. We find an antiferromagnetically induced w eight above the naive Fermi momentum. Upon hole doping, the chemical p otential mu, moves to the top of the lower band where a robust peak is observed. Results are compared with spin-density-wave mean-field and self-consistent Born approximation results, and also with the infinite -dimensional (D=infinity) Hubbard model, and experimental photoemissio n for three-dimensional transition-metal oxides.