PACS. 71.27+a -Strongly correlated electron systems; heavy fermions. PACS. 71.30+h -Metal-insulator transitions and other electronic transitions.Abstract. -The two-dimensional Hubbard model with a bimodal distribution of on-site interactions, P (U i ) = (1− f)δ(U i − U) + fδ(U i ), is studied using finite-temperature Quantum Monte Carlo and dynamical mean-field theory. Long-range antiferromagnetic order off half-filling is stabilized by the disorder, due to localization of the dopants on the U = 0 sites. Whereas in the clean model there is a single gap at n = 1, for nonzero f we find the compressibility and density of states exhibit gaps at two separate fillings.
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