https://doi.org/10.1007/s100510170313
Phase diagram of the Mott transition in a two-band Hubbard model in infinite dimensions
1
Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8602, Japan
2
Department of Mathematics, Imperial College, 180 Queen's Gate, London SW7 2BZ, UK
3
Theoretische Physik III, Elektronische Korrelationen und Magnetismus, Universität Augsburg, Germany
Corresponding author: a c42545a@nucc.cc.nagoya-u.ac.jp
Received:
5
October
2000
Revised:
8
December
2000
Published online: 15 February 2001
The Mott metal-insulator transition in the two-band Hubbard model in infinite dimensions is studied by using the linearized dynamical mean-field theory recently developed by Bulla and Potthoff. The phase boundary of the metal-insulator transition is obtained analytically as a function of the on-site Coulomb interaction at the d-orbital, the charge-transfer energy between the d- and p-orbitals and the hopping integrals between p-d, d-d and p-p orbitals. The result is in good agreement with the numerical results obtained from the exact diagonalization method.
PACS: 71.10.Fd – Lattice fermion models (Hubbard model, etc.) / 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.30.+h – Metal-insulator transitions and other electronic transitions
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2001
