Vol. 22 No. 3 (2012)
Papers

Mott Transitions in the 2-band Hubbard Model: A Coherent Potential Approximation Study

Le Duc Anh
Department of Physics, Hanoi National University of Education
Hoang Anh Tuan
Institute of Physics, VAST

Published 31-10-2012

How to Cite

Anh, L. D., & Tuan, H. A. (2012). Mott Transitions in the 2-band Hubbard Model: A Coherent Potential Approximation Study. Communications in Physics, 22(3), 223. https://doi.org/10.15625/0868-3166/22/3/2524

Abstract

The half-filled isotropic degenerate two-band Hubbard model is studied within coherent potential approximation. The model is characterized by an Ising-type Hund’s exchange coupling, intra- and inter-orbital Coulomb parameters. We found that the band degeneracy slightly reduces the Mott-Hubbard critical value \(U_C\). We reveal that the system can have two distinct critical values for Mott-Hubbard transitions.

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