Deciding the fate of the false Mott transition in two dimensions by exact quantum Monte Carlo methods
arXiv:1504.05090 · doi:10.1088/1742-6596/640/1/012047
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.
CCP 2014 proceeding, 6 pages
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