Enhancement of Long Range Antiferromagnetic Order by Nonmagnetic Impurities in the Hubbard Model

Details Enhancement of Long Range Antiferromagnetic Order by Nonmagnetic Impurities in the Hubbard Model Enhancement of Long Range Antiferromagnetic Order by Nonmagnetic Impurities in the Hubbard Model

1997-07-07

arxiv.org/abs/cond-mat/9707068v2

Europhys. Lett. 42, 655 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages with 5 figures, final version

Scientific paper

10.1209/epl/i1998-00301-2

The two-dimensional Hubbard model with a bimodal distribution of on-site interactions, P(U_i) = (1-f)\delta(U_i-U) + f\delta(U_i), 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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