Ordered states in the disordered Hubbard model

Details Ordered states in the disordered Hubbard model Ordered states in the disordered Hubbard model

1998-05-08

arxiv.org/abs/cond-mat/9805100v1

Physica A 251, 162-178 (1998)

Physics

Condensed Matter

Strongly Correlated Electrons

17 pages, including 8 figures. Paper for Festschrift in honor of Hans van Leeuwen's 65th birthday

Scientific paper

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.

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