Abstract
Developing a local three-body scattering theory on a multi-orbital tight-binding model, we study the excitation spectra of the antiferromagnetic transition metal oxides, MnO, FeO, CoO and NiO. The multiplet structures of three-particle states are fully taken into account. It is shown that the self-energy correction drastically improves the excitation spectra, leading to the correct value of the band gap and the satellite structure in agreement with photoemission experiments. The quasiparticle dispersions are obtained in good agreement with the angle-resolved photoemission data of CoO and NiO.
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