Enhancement of Long Range Antiferromagnetic Order by Nonmagnetic Impurities in the Hubbard Model
Abstract
The two-dimensional Hubbard model with a bimodal distribution of on-site interactions, P(Ui) = (1-f)δ(Ui-U) + fδ(Ui), is studied using a finite temperature quantum Monte Carlo technique and dynamical mean-field theory. We find 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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