Energy Band Structure of Strongly Correlated Electrons in a CuO2 Layer

Abstract

The results of the electronic structure calculations of CuO2 layer, performed by generalized tight-binding method presented. The strong electron correlations both on the Cu and O ions are included explicity. The resulting quasi-particle band structure contains an insulator gap for the undoped compounds like La2CuO4. The valence band consists of a large number of the narrow Hubbard quasi-particle bands. The dispersion law of quasi-particles at the top of the valence band has a minimum at the Γ point, indicating the existence of the multi-valley Fermi surface in the doped La2-xSrxCuO4. The origin of the Fermi liquid behavior in the narrow quasi-particle bands is discussed.KeywordsValence BandEnergy Band StructureHubbard BandHubbard OperatorFermi Liquid BehaviorThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.