Kink structure in the electronic dispersion of high-Tc superconductors from the electron-phonon interaction

TL;DR

This study models high-Tc superconductors considering electron-electron and electron-phonon interactions, revealing a dispersion kink along the nodal direction and a small isotope effect, enhancing understanding of their electronic properties.

Contribution

It introduces a combined model of electron-electron and electron-phonon interactions to explain dispersion kinks in high-Tc superconductors.

Findings

Electron-phonon interaction causes a dispersion kink along the nodal direction.

A small isotope effect is observed on the electronic dispersion.

The model applies across the hole-doped region of high-Tc superconductors.

Abstract

We investigate the electronic dispersion of high-Tc superconductor on the basis of the two-dimensional three-band Hubbard model with the electron-phonon interaction together with the strong electron-electron interaction. In our model, it is shown across the hole-doped region of high-Tc superconductor that the electron-phonon interaction makes a dispersion kink, observed along the nodal direction, and that the small isotope effect appears on the electronic dispersion.