Electron-phonon interaction and antiferromagnetic correlations |
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| Authors: | Sangiovanni G Gunnarsson O Koch E Castellani C Capone M |
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| Institution: | Max-Planck Institut für Festk?rperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany. |
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| 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. |
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