Single polaron properties of the breathing-mode Hamiltonian
Materials Science
2011-09-14 v1
Abstract
We investigate numerically various properties of the one-dimensional (1D) breathing-mode polaron. We use an extension of a variational scheme to compute the energies and wave-functions of the two lowest-energy eigenstates for any momentum, as well as a scheme to compute directly the polaron Greens function. We contrast these results with results for the 1D Holstein polaron. In particular, we find that the crossover from a large to a small polaron is significantly sharper. Unlike for the Holstein model, at moderate and large couplings the breathing-mode polaron dispersion has non-monotonic dependence on the polaron momentum k. Neither of these aspects is revealed by a previous study based on the self-consistent Born approximation.
Keywords
Cite
@article{arxiv.0708.2920,
title = {Single polaron properties of the breathing-mode Hamiltonian},
author = {Bayo Lau and Mona Berciu and George A. Sawatzky},
journal= {arXiv preprint arXiv:0708.2920},
year = {2011}
}