Metal-insulator transition in the Hubbard model: a simple description including the Kondo effect
Institute of Metal Physics, S.Kovalevskay str. 18,
620219 Ekaterinburg, Russia
Corresponding author: a firstname.lastname@example.org
Published online: 8 June 2004
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.
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, 2004