Electron-phonon interaction and antiferromagnetic correlations.

نویسندگان

  • G Sangiovanni
  • O Gunnarsson
  • E Koch
  • C Castellani
  • M Capone
چکیده

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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عنوان ژورنال:
  • Physical review letters

دوره 97 4  شماره 

صفحات  -

تاریخ انتشار 2006