Charge fluctuations and electron-phonon interaction in the finite-$U$ Hubbard model

Abstract

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-$\mathbf{q}$ peak structure, parametrized by a cut-off $q_c$, are shown to be essentially ruled by the band narrowing factor $Z_{\mathrm{MF}}$ due to the electronic correlation. A phase diagram of $Z_{\mathrm{MF}}$ and $q_c$ in the whole $U$-$n$ space is presented. Our results are in more than qualitative agreement with a recent numerical analysis and permit to understand some anomalous features of the Quantum Monte Carlo data.

4 pages, eps figures included

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• Anomalous Dispersion of Longitudinal Optical Phonons in $\mathbf{N}{\mathbf{d}}_{1.86}\mathbf{C}{\mathbf{e}}_{0.14}\mathbf{Cu}{\mathbf{O}}_{4+\mathbf{\delta }}$ Determined by Inelastic X-ray Scattering
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