Spectral function of the small polaron
Strongly Correlated Electrons
2009-10-30 v2
Abstract
We compute exactly both the spectral function of the electron and of the small polaron for the two site Holstein model. We find that for intermediary coupling, the small polaron is a better fundamental excitation of the system than the electron. However, the Lang-Firsov approximation fails to predict the right dispersion relation for the small polaron.
Cite
@article{arxiv.cond-mat/9704237,
title = {Spectral function of the small polaron},
author = {J. M. Robin},
journal= {arXiv preprint arXiv:cond-mat/9704237},
year = {2009}
}
Comments
revtex 3 pages, 6 eps figures. 4 c programs added