Photoemission spectra of many-polaron systems
Abstract
The cross over from low to high carrier densities in a many-polaron system is studied in the framework of the one-dimensional spinless Holstein model, using unbiased numerical methods. Combining a novel quantum Monte Carlo approach and exact diagonalization, accurate results for the single-particle spectrum and the electronic kinetic energy on fairly large systems are obtained. A detailed investigation of the quality of the Monte Carlo data is presented. In the physically most important adiabatic intermediate electron-phonon coupling regime, for which no analytical results are available, we observe a dissociation of polarons with increasing band filling, leading to normal metallic behavior, while for parameters favoring small polarons, no such density-driven changes occur. The present work points towards the inadequacy of single-polaron theories for a number of polaronic materials such as the manganites.
Keywords
Cite
@article{arxiv.cond-mat/0412010,
title = {Photoemission spectra of many-polaron systems},
author = {M. Hohenadler and D. Neuber and W. von der Linden and G. Wellein and J. Loos and H. Fehske},
journal= {arXiv preprint arXiv:cond-mat/0412010},
year = {2007}
}
Comments
15 pages, 13 figures; final version, accepted for publication in Phys. Rev. B