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(U_i) = (1-f)δ(U_i-U) + fδ(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.

6 pages with 5 figures, final version

References in corpus (3)

• Local Enhancement of Antiferromagnetic Correlations by Nonmagnetic Impurities
• One particle spectral weight of the three dimensional single band Hubbard model
• Ordered states in the disordered Hubbard model

Cited by in corpus (11)

• Conducting phase in the two-dimensional disordered Hubbard model
• Mott-Hubbard metal-insulator transition at non-integer filling
• Ferromagnetism beyond Lieb's theorem
• Interacting electrons in a two-dimensional disordered environment: Effect of a Zeeman magnetic field
• Cooling Atomic Gases With Disorder
• Destruction of Superconductivity by Impurities in the Attractive Hubbard Model
• Dynamical resilience to disorder: the dilute Hubbard model on the Lieb lattice
• Antiferromagnetism beyond classical percolation threshold in the site-diluted half-filled one-band Hubbard model in three dimensions
• Percolation on Lieb lattices
• Thermodynamics of the disordered Hubbard model studied via numerical linked-cluster expansions
• Magnetic impurities in a charge-ordered background