Strong Coupling Diagram Technique for the Three-Band Hubbard Model

Abstract

Using the strong coupling diagram technique equations are derived for hole Green's functions of the three-band Hubbard model, which describes Cu-O planes of high-$T_c$ cuprates. The equations are self-consistently solved in the approximation, in which the series for the irreducible part in powers of the oxygen-copper hopping constant is truncated to two lowest-order terms. For parameters used for hole-doped cuprates the calculated energy spectrum consists of lower and upper Hubbard subbands of predominantly copper nature, oxygen bands with a small admixture of copper states and the Zhang-Rice states of mixed nature, which are located between the lower Hubbard subband and oxygen bands. The spectrum contains also pseudogaps near transition frequencies of Hubbard atoms on copper sites.

10 pages, 3 figures, To appear in Proceedings of Intern. Conference "Electron Correlations in Nanostructures", September 3-6, 2015, Odessa, Ukraine

References in corpus (4)

• Physics of cuprates with the two-band Hubbard model - The validity of the one-band Hubbard model
• Optical Weights and Waterfalls in Doped Charge Transfer Insulators: an LDA+DMFTStudy of LSCO
• Correlation Strength, Gaps and Particle-Hole Asymmetry in High-Tc Cuprates: a Dynamical Mean Field Study of the Three-Band Copper-Oxide Model
• Phase diagram and single-particle spectrum of CuO${}_2$ layers within a variational cluster approach to the 3-band Hubbard model