Electron-phonon interaction and antiferromagnetic correlations
- Sangiovanni G
- Gunnarsson O
- Koch E
- Castellani C
- Capone, Massimo
Publication date
January 2006
DOI Publisher
American Physical Society (APS)Abstract
We study effects of the Coulomb repulsion on the electron-phonon interaction (EPI) in the Holstein-Hubbard model, using the antiferromagnetic (AF) dynamical mean-field approximation. AF correlations strongly enhance EPI effects on the electron Green's function with respect to the paramagnetic correlated system, but the net effect of the Coulomb interaction is a moderate suppression of the EPI. Doping leads to additional suppression. In contrast, the Coulomb interaction strongly suppresses EPI effects on phonons, but the suppression weakens with doping. RI Capone, Massimo/A-7762-200
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