The extended Hubbard model with attractive interactions
Strongly Correlated Electrons
2019-02-15 v2
Abstract
We discuss the phase diagram of the extended Hubbard model with both attractive and repulsive local and nonlocal interactions. The extended dynamical mean-field theory (EDMFT) and the dual boson method (DB) are compared. The latter contains additional nonlocal correlation effects that are not incorporated in EDMFT. We find that EDMFT and DB give almost identical results in the attractive regime, where phase separation occurs. This is quite a difference with the previously studied repulsive regime, where EDMFT and DB give very different phase boundaries for the checkerboard order phase, especially at small .
Cite
@article{arxiv.1709.06379,
title = {The extended Hubbard model with attractive interactions},
author = {E. G. C. P. van Loon and M. I. Katsnelson},
journal= {arXiv preprint arXiv:1709.06379},
year = {2019}
}
Comments
To be submitted to the proceedings of CCP2017, to appear in Journal of Physics Conference Series (IOP); comments are welcome