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

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

2007-02-27

arxiv.org/abs/cond-mat/0702643v1

J. Phys: Condens. Matter. 17, pp1385-1397 (2005)

Physics

Condensed Matter

Strongly Correlated Electrons

Reprint of final submitted version to improve access. 13 pages, 10 figures. Published in 2005

Scientific paper

10.1088/0953-8984/17/8/017

I investigate band and Mott insulating states in a two-band Hubbard model, with the aim of understanding the differences between the idealised one-orbital model and the more realistic multi-band case. Using a projection ansatz I show that additional orbitals suppress the metal-insulator transition, leading to a critical coupling of approximately eight times the bare band-width. I also demonstrate the effects of orbital ordering, which hinder Mott-Hubbard states and open a band gap. Since multi-band correlations are common in real materials, this work suggests that the existence of very strongly correlated band insulators may be more common than Mott-Hubbard insulators.

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