Kink structure in the electronic dispersion of high-Tc superconductors   from the electron-phonon interaction
  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. 
Shigeru Koikegami and Yoshihiro Aiura