Effect of out-of-plane interactions on normal state spectral properties of bilayer cuprate

Abstract

We have investigated the effect of intrabilayer coupling and out-of-plane Coulomb correlation on spectral properties of bilayer cuprates in their normal state. The electron correlations which exist in the individual CuO₂ layers are described by t_||-t'-t"-U model. The coupling between the two layer of same unit cell is included by hopping matrix element t_⊥ and out-of-plane Coulomb correlation U_⊥. Calculations of the electronic spectral function have been made for various values of intrabilayer hopping and out-of-plane Coulomb correlation at different k-points of Brillouin zone in the overdoped regime. It is found through our numerical calculations that the intrabilayer coupling provides favorable condition for splitting of quasiparticle peak of spectral function, while out-of-plane Coulomb correlation tries to suppress this effect. Calculations for density of states and hole density have also been made.