Charge fluctuations and electronphonon interaction in the finite- U Hubbard model

@inproceedings{Cappelluti2004ChargeFA,
  title={Charge fluctuations and electronphonon interaction in the finite- U Hubbard model},
  author={Emmanuele Cappelluti and Benedetta Cerruti and Luciano Pietronero},
  year={2004}
}
In this paper we employ a gaussian expansion within the finite-$U$ slave-bosons formalism to investigate the momentum structure of the electron-phonon vertex function in the Hubbard model as function of $U$ and $n$. The suppression of large momentum scattering and the onset a small-${\bf q}$ peak structure, parametrized by a cut-off $q_c$, are shown to be essentially ruled by the band narrowing factor $Z_{\rm MF}$ due to the electronic correlation. A phase diagram of $Z_{\rm MF}$ and $q_c$ in… CONTINUE READING

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