Phase diagram of the Mott Transition in a two-band Hubbard model in infinite dimensions
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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 onsite 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.
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