Abstract
The results of electronic structure calculations of the CuO2 layer, performed by the generalized tight-binding method, are presented. The strong electron correlations on both the Cu and O ions are included explicitly. The resulting quasiparticle band structure contains an insulator gap for undoped compounds like La2CuO4. The valence band consists of a large number of narrow Hubbard quasiparticle bands. The dispersion law of quasiparticles at the top of the valence band has a minimum at the Γ point, indicating the existence of the multivalley Fermi surface in the doped La2-xSr x CuO4. The origin of the Fermi liquid behavior in the narrow quasiparticle bands is discussed.
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