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We present an algorithm for the computation of unbiased Green functions andself-energies for quantum lattice models, free from systematic errors and validin the thermodynamic limit. The method combines direct lattice simulationsusing the Blankenbecler Scalapino-Sugar quantum Monte Carlo (BSS-QMC) approachwith controlled multigrid extrapolation techniques. We show that thehalf-filled Hubbard model is insulating at low temperatures even in theweak-coupling regime; the previously claimed Mott transition at intermediatecoupling does not exist.

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