Mott-Hubbard transition in the mass-imbalanced Hubbard model
Abstract
The mass-imbalanced Hubbard model represents a continuous evolution from the Hubbard to the Falicov-Kimball model. We employ dynamical mean field theory and study the paramagnetic metal-insulator transition, which has a very different nature for the two limiting models. Our results indicate that the metal-insulator transition rather resembles that of the Hubbard model as soon as a tiny hopping between the more localized fermions is switched on. At low temperatures we observe a first-order metal-insulator transition and a three peak structure. The width of the central peak is the same for the more and less mobile fermions when approaching the phase transition, which agrees with our expectation of a common Kondo temperature and phase transition for the two species.
Keywords
Cite
@article{arxiv.1611.10079,
title = {Mott-Hubbard transition in the mass-imbalanced Hubbard model},
author = {Marie-Therese Philipp and Markus Wallerberger and Patrik Gunacker and Karsten Held},
journal= {arXiv preprint arXiv:1611.10079},
year = {2017}
}
Comments
7 pages, 7 figures