Phys. Rev. B 61, 8628–8630 (2000)Phonon spectral function for an interacting electron-phonon systemReceived 4 October 1999; published in the issue dated 1 April 2000 Using exact diagonalization 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). © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.61.8628
DOI:
10.1103/PhysRevB.61.8628
PACS:
63.20.Kr, 63.22.+m
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