Renormalization of dispersion in electron-doped bilayer cuprate superconductors

TL;DR

This paper investigates how bilayer coupling influences the electron dispersion kink in electron-doped cuprate superconductors, revealing an enhanced kink effect at the antinodal region due to bilayer interactions.

Contribution

It demonstrates that bilayer coupling amplifies the dispersion kink at the antinodal region in electron-doped cuprates, extending understanding of electron dispersion renormalization.

Findings

Kink present around the entire Fermi surface.

Enhanced kink effect at the antinodal region due to bilayer coupling.

Consistent with single-layer dispersion features.

Abstract

The renormalization of the electrons in cuprate superconductors is characterized by the kink in the quasiparticle dispersion. Here the bilayer coupling effect on the quasiparticle dispersion kink in the electron-doped bilayer cuprate superconductors is studied based on the kinetic-energy-driven superconductivity. It is shown that the kink in the quasiparticle dispersion is present all around the electron Fermi surface, as the quasiparticle dispersion kink in the single-layer case. However, in comparison with the corresponding single-layer case, the kink effect in the quasiparticle dispersion at around the antinodal region becomes the most pronounced, indicating that the kink effect in the quasiparticle dispersion at around the antinodal region is enhanced by the bilayer coupling.