QUASI-PARTICLE BAND-STRUCTURE OF NIO - THE MOTT-HUBBARD PICTURE REGAINED

We demonstrate that the Hubbard correlation among Ni 3d electrons is a ble to reproduce the insulating character of NiO, the correct value of the gap, the orbital character of the valence band edge, and the pres ence of satellite structures. We have determined the quasiparticle spe ctra starting from the complex single particle band structure of NiO a nd including the on-site Hubbard repulsion according to a recently dev eloped three-body scattering theory which allows us to treat highly co rrelated and highly hybridized systems. The calculated quasiparticle b and structure is in excellent agreement with photoemission data.