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Quasiparticle bands and superconductivity in bilayer cuprates

A. I. Liechtenstein·O. Gunnarsson·O. K. Andersen·R. M. Martin
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Abstract

We analyze the generic features of the energy spectrum for two coupled CuO$_2$ layers with a realistic extended Hubbard model. The quasiparticle bands exhibit flat regions near X(Y) points in the Brillouin zone with a large reduction of the bonding-antibonding splitting, and pinning of extended van-Hove singularity to the Fermi level, which is more efficient for a bi-layers than for a single layer. In contrast to the results with simpler models, the superconducting temperature for d$_{x^2-y^2}$ pairing is not lowered by the bi-layer hopping.

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A. I. Liechtenstein, O. Gunnarsson, O. K. Andersen, R. M. Martin. 1995-09-16. Quasiparticle bands and superconductivity in bilayer cuprates. https://arxiv.org/abs/cond-mat/9509101

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