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

Hague, J. P. (2005). Suppression of Mott–Hubbard states and metal–insulator transitions in the two-band Hubbard model. Journal of Physics: Condensed Matter, 17(8), pp. 1385–1397.

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DOI (Digital Object Identifier) Link:	http://dx.doi.org/doi:10.1088/0953-8984/17/8/017
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Abstract

I investigate band and Mott insulating states in a two-band Hubbard model, with the aim of understanding the differences between the idealized 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 bandwidth. I also demonstrate the effects of orbital ordering, which hinder Mott–Hubbard states and open a bandgap. Since multi-band correlations are common in real materials, this work suggests that very strongly correlated band insulators may be more common than Mott–Hubbard insulators.

Item Type:	Journal Article
ISSN:	0953-8984
Academic Unit/Department:	Science > Physical Sciences
Interdisciplinary Research Centre:	Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID:	12283
Depositing User:	James Hague
Date Deposited:	15 May 2009 13:40
Last Modified:	05 Dec 2010 06:09
URI:	http://oro.open.ac.uk/id/eprint/12283

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