Polaron features for long-range electron-phonon interaction

Details Polaron features for long-range electron-phonon interaction Polaron features for long-range electron-phonon interaction

2004-02-07

arxiv.org/abs/cond-mat/0402211v1

J. Phys.: Condens. Matter 16,1593 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

4 figs., to appear in J. Phys.:Condens. Matter

Scientific paper

10.1088/0953-8984/16/9/007

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.

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