Consistent partial bosonization of the extended Hubbard model
Strongly Correlated Electrons
2019-11-12 v2
Abstract
We design an efficient and balanced approach that captures major effects of collective electronic fluctuations in strongly correlated fermionic systems using a simple diagrammatic expansion on a basis of dynamical mean-field theory. For this aim we perform a partial bosonization of collective fermionic fluctuations in leading channels of instability. We show that a simultaneous account for different bosonic channels can be done in a consistent way that allows to avoid the famous Fierz ambiguity problem. The present method significantly improves a description of an effective screened interaction in both, charge and spin channels, and has a great potential for application to realistic -like calculations for magnetic materials.
Cite
@article{arxiv.1908.00536,
title = {Consistent partial bosonization of the extended Hubbard model},
author = {E. A. Stepanov and V. Harkov and A. I. Lichtenstein},
journal= {arXiv preprint arXiv:1908.00536},
year = {2019}
}