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Slave-boson mean-field theory of the Mott transition in the two-band Hubbard model

Author

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  • A. Rüegg
  • M. Indergand
  • S. Pilgram
  • M. Sigrist

Abstract

We apply the slave-boson approach of Kotliar and Ruckenstein to the two-band Hubbard model with an Ising like Hund's rule coupling and bands of different widths. On the mean-field level of this approach we investigate the Mott transition and observe both separate and joint transitions of the two bands depending on the choice of the inter- and intra-orbital Coulomb interaction parameters. The mean-field calculations allow for a simple physical interpretation and can confirm several aspects of previous work. Beside the case of two individually half-filled bands we also examine what happens if the original metallic bands possess fractional filling either due to finite doping or due to a crystal field which relatively shifts the atomic energy levels of the two orbitals. For appropriate values of the interaction and of the crystal field we can observe a band insulating state and a ferromagnetic metal. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2005

Suggested Citation

  • A. Rüegg & M. Indergand & S. Pilgram & M. Sigrist, 2005. "Slave-boson mean-field theory of the Mott transition in the two-band Hubbard model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 48(1), pages 55-64, November.
    • Handle: RePEc:spr:eurphb:v:48:y:2005:i:1:p:55-64
    DOI: 10.1140/epjb/e2005-00382-1
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