Deciding the fate of the false Mott transition in two dimensions by exact quantum Monte Carlo methods
Strongly Correlated Electrons
2015-10-28 v1
Abstract
We present an algorithm for the computation of unbiased Green functions and self-energies for quantum lattice models, free from systematic errors and valid in the thermodynamic limit. The method combines direct lattice simulations using the Blankenbecler Scalapino-Sugar quantum Monte Carlo (BSS-QMC) approach with controlled multigrid extrapolation techniques. We show that the half-filled Hubbard model is insulating at low temperatures even in the weak-coupling regime; the previously claimed Mott transition at intermediate coupling does not exist.
Keywords
Cite
@article{arxiv.1504.05090,
title = {Deciding the fate of the false Mott transition in two dimensions by exact quantum Monte Carlo methods},
author = {D. Rost and N. Blümer},
journal= {arXiv preprint arXiv:1504.05090},
year = {2015}
}
Comments
CCP 2014 proceeding, 6 pages