Electron-phonon coupling in correlated materials: Insights from the Hubbard-Holstein model
Phys. Rev. B 113, 165145 – Published 27 April, 2026
DOI: https://doi.org/10.1103/3qk3-py1n
Abstract
Dynamical mean-field theory computations of the electron self-energy of the Hubbard-Holstein model as a function of electron-phonon and electron-electron interactions are analyzed to gain insight into the dependence of electron-phonon couplings on correlation strength in quantum materials. We find that the electron-phonon interaction is strongly suppressed by electronic correlations, while electron-electron correlation effects at Fermi liquid scales are only weakly modified by coupling to phonons, with phonon-induced modifications most evident at high frequencies on the order of the electronic bandwidth. Implications for beyond-density functional theories of the electron-phonon interaction are discussed.
