Ordered states in the disordered Hubbard model

P.J.h Denteneer, M Ulmke, R.t Scalettar and G.t Zimanyi

Physica A: Statistical Mechanics and its Applications, 1998, vol. 251, issue 1, 162-178

Abstract: The Hubbard model is studied in which disorder is introduced by putting the on-site interaction to zero on a fraction f of (impurity) sites of a square lattice. Using quantum Monte Carlo methods and dynamical mean-field theory we find that antiferromagnetic long-range order is initially enhanced at half-filling and stabilized off half-filling by the disorder. The Mott–Hubbard charge gap of the pure system is broken up into two pieces by the disorder: one incompressible state remains at average density n=1 and another can be seen slightly below n=1+f. Qualitative explanations are provided.

Date: 1998
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Persistent link: https://EconPapers.repec.org/RePEc:eee:phsmap:v:251:y:1998:i:1:p:162-178

DOI: 10.1016/S0378-4371(97)00602-X

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