Fate of the false Mott-Hubbard transition in two dimensions
Strongly Correlated Electrons
2015-03-05 v3
Abstract
We have studied the impact of non-local electronic correlations at all length scales on the Mott-Hubbard metal-insulator transition in the unfrustrated two-dimensional Hubbard model. Combining dynamical vertex approximation, lattice quantum Monte-Carlo and variational cluster approximation, we demonstrate that scattering at long-range fluctuations, i.e., Slater-like paramagnons, opens a spectral gap at weak-to-intermediate coupling -- irrespectively of the preformation of localized or short-ranged magnetic moments. This is the reason, why the two-dimensional Hubbard model is insulating at low enough temperatures for any (finite) interaction and no Mott-Hubbard transition is observed.
Keywords
Cite
@article{arxiv.1405.7250,
title = {Fate of the false Mott-Hubbard transition in two dimensions},
author = {T. Schäfer and F. Geles and D. Rost and G. Rohringer and E. Arrigoni and K. Held and N. Blümer and M. Aichhorn and A. Toschi},
journal= {arXiv preprint arXiv:1405.7250},
year = {2015}
}
Comments
5 pages, 3 figures