Phonon spectral function for an interacting electron-phonon system

Abstract

Using exact diagonalzation techniques, we study a model of interacting electrons and phonons. The spectral width of the phonons is found to be reduced as the Coulomb interaction U is increased. For a system with two modes per site, we find a transfer of coupling strength from the upper to the lower mode. This transfer is reduced as U is increased. These results give a qualitative explanation of differences between Raman and photoemission estimates of the electron-phonon coupling constants for A3C60 (A= K, Rb).

4 pages, RevTeX, 2 eps figure

References in corpus (2)

• Superconductivity in Fullerides
• Phonon line shape in disordered A3C60 (A= K, Rb)

Cited by in corpus (4)

• Dynamic response functions for the Holstein-Hubbard model
• Electron-phonon interaction and antiferromagnetic correlations
• Competition between antiferromagnetic and charge order in the Hubbard-Holstein model
• Apparent electron-phonon interaction in strongly correlated systems