Deciding the fate of the false Mott transition in two dimensions by exact quantum Monte Carlo methods

Autor:	Rost, D., Blümer, N.
Rok vydání:	2015
Předmět:	Condensed Matter - Strongly Correlated Electrons
Druh dokumentu:	Working Paper
DOI:	10.1088/1742-6596/640/1/012047
Popis:	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. Comment: CCP 2014 proceeding, 6 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/1504.05090 Zobrazit plný text záznamu View this record from Arxiv