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I investigate band and Mott insulating states in a two-band Hubbard model,with the aim of understanding the differences between the idealised one-orbitalmodel and the more realistic multi-band case. Using a projection ansatz I showthat additional orbitals suppress the metal-insulator transition, leading to acritical coupling of approximately eight times the bare band-width. I alsodemonstrate the effects of orbital ordering, which hinder Mott-Hubbard statesand open a band gap. Since multi-band correlations are common in realmaterials, this work suggests that the existence of very strongly correlatedband insulators may be more common than Mott-Hubbard insulators.Comment: Reprint of final submitted version to improve access. 13 pages, 10  figures. Published in 200

Suppression of Mott–Hubbard states and metal–insulator transitions in the two-band Hubbard model