Mobile Bipolaron
Strongly Correlated Electrons
2007-05-23 v1
Abstract
We explore the properties of the bipolaron in a 1D Holstein-Hubbard model with dynamical quantum phonons. Using a recently developed variational method combined with analytical strong coupling calculations, we compute correlation functions, effective mass, bipolaron isotope effect and the phase diagram. The two site bipolaron has a significantly reduced mass and isotope effect compared to the on-site bipolaron, and is bound in the strong coupling regime up to twice the Hubbard U naively expected. The model can be described in this regime as an effective t-J-V model with nearest neighbor repulsion. These are the most accurate bipolaron calculations to date.
Cite
@article{arxiv.cond-mat/0001325,
title = {Mobile Bipolaron},
author = {J. Bonca and T. Katrasnik and S. A. Trugman},
journal= {arXiv preprint arXiv:cond-mat/0001325},
year = {2007}
}
Comments
5 pages, 3 figures