Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-10-20
Phys. Rev. B 61, 8628 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, RevTeX, 2 eps figure
Scientific paper
10.1103/PhysRevB.61.8628
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).
Gunnarsson Olle
Han Jong E.
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