# Electronic structure of kinetic energy driven superconductors in the presence of bilayer splitting

## TL;DR

This paper investigates how bilayer splitting influences the electronic structure of cuprate superconductors within a kinetic energy driven framework, explaining the peak-dip-hump features and doping effects observed experimentally.

## Contribution

It provides a theoretical analysis of bilayer splitting effects on the electronic spectral features in superconducting cuprates, linking spectral peaks to bonding and antibonding components.

## Key findings

- Peak-dip-hump structure is mainly caused by bilayer splitting.
- Superconducting peak relates to antibonding component.
- Spectral weight increases with doping.

## Abstract

Within the framework of the kinetic energy driven superconductivity, the electronic structure of bilayer cuprate superconductors in the superconducting state is studied. It is shown that the electron spectrum of bilayer cuprate superconductors is split into the bonding and antibonding components by the bilayer splitting, then the observed peak-dip-hump structure around the $[\pi,0]$ point is mainly caused by this bilayer splitting, with the superconducting peak being related to the antibonding component, and the hump being formed by the bonding component. The spectral weight increases with increasing the doping concentration. In analogy to the normal state case, both electron antibonding peak and bonding hump have the weak dispersions around the $[\pi,0]$ point.