title: Correlation-induced Suppression of Bilayer Splitting in High-TcCuprates: A Variational Cluster Approach.
abstract: We carry out a theoretical study of the bilayer single-band Hubbard model in the undoped and in the superconducting phases by means of the variational cluster approach. In particular, we focus on the splitting between the "bonding" and "antibonding" bands induced by the interlayer hopping, as well as its interplay with strong correlation effects. We find that the splitting is considerably suppressed in both the normal and superconducting phases, in qualitative agreement with experiments on Bi2Sr2CaCu2O8+δ. In addition, in the superconducting phase, the shape of the splitting inkspace is modified by correlations.
authors.affiliation: Institute of Theoretical and Computational Physics TU Graz, 8010 Graz, Austria.
authors.forename: Anna M
authors.initials: AM
authors.lastname: Fulterer
authors.affiliation: Institute of Theoretical and Computational Physics TU Graz, 8010 Graz, Austria.
authors.forename: Enrico
authors.initials: E
authors.lastname: Arrigoni
keywords: Electronic correlations; High-temperature superconductivity