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.
Electron-phonon interaction and antiferromagnetic correlations / G., Sangiovanni; O., Gunnarsson; E., Koch; Castellani, Claudio; M., Capone. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 97:4(2006), pp. 046404-1-046404-4. [10.1103/physrevlett.97.046404]
Electron-phonon interaction and antiferromagnetic correlations
CASTELLANI, Claudio;
2006
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.| File | Dimensione | Formato | |
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