Metal-insulator transition in the Hubbard model: a simple description including the Kondo effect

V. Irkhin () and A. Zarubin

The European Physical Journal B: Condensed Matter and Complex Systems, 2004, vol. 38, issue 4, 563-570

Abstract: The electron spectrum structure in the half-filled Hubbard model is considered in terms of the one-particle Green’s functions within many-electron representation. A simple analytical generalization of the single-site Hubbard-III approximation is obtained, which takes into account the Fermi excitations (Kondo terms). The problem of the metal-insulator transition in the paramagnetic phase is investigated. The occurrence of a three-peak density-of-states structure including the “Kondo” peak at the Fermi level is discussed. A comparison with large-d calculations is performed. Copyright Springer-Verlag Berlin/Heidelberg 2004

Date: 2004
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DOI: 10.1140/epjb/e2004-00153-6

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