Polaron features for long-range electron-phonon interaction
Abstract
The polaron features for long-range electron-phonon interaction are investigated by extending a variational approach previously proposed for the study of systems with local coupling. The ground-state spectral weight, the average kinetic energy, the mean number of phonons, and the electron-lattice correlation function are discussed for a wide range of model parameters focusing on the adiabatic regime and comparing the results with the short-range case (Holstein model). A strong mixing of electronic and phononic degrees of freedom for small values of the electron-phonon coupling constant is found in the adiabatic case due to the long-range interaction. Finally a polaron "phase diagram" is proposed.
Cite
@article{arxiv.cond-mat/0402211,
title = {Polaron features for long-range electron-phonon interaction},
author = {C. A. Perroni and V. Cataudella and G. De Filippis},
journal= {arXiv preprint arXiv:cond-mat/0402211},
year = {2009}
}
Comments
4 figs., to appear in J. Phys.:Condens. Matter