We perform a detailed study of the phase transitions and mechanisms of electron localization in the extended Hubbard model using the dynamical cluster approximation on a 2×2 cluster. We explore the interplay of charge order and Mott physics. We find that a nearest-neighbor Coulomb interaction V causes "screening" effects close to the Mott phase transition, pushing the phase boundary to larger values of U. We also demonstrate the different effects of V on correlations in metallic and insulating regimes and document the different correlation aspects of charge order and Mott states.
@article{arxiv.2105.09414,
title = {Dynamical Cluster Approximation Study of Electron Localization in the Extended Hubbard Model},
author = {Hanna Terletska and Sergei Iskakov and Thomas Maier and Emanuel Gull},
journal= {arXiv preprint arXiv:2105.09414},
year = {2021}
}