Numerical study of disorder effects on the three-dimensional Hubbard model

Details Numerical study of disorder effects on the three-dimensional Hubbard model Numerical study of disorder effects on the three-dimensional Hubbard model

2000-05-17

arxiv.org/abs/cond-mat/0005270v1

Physics

Condensed Matter

Strongly Correlated Electrons

3 pages, 2 figures, submitted to Phys. Rev. B

Scientific paper

10.1088/0953-8984/12/44/312

Combined effects of interactions and disorder are investigated using a finite temperature quantum Monte Carlo technique for the three-dimensional Hubbard model with random potentials of a finite range. Temperature dependence of the charge compressibility shows that the Mott gap collapses beyond a finite disorder strength. This is a quantum phase transition from an incompressible phase to a compressible phase driven by disorder. We calculate the antiferromagnetic structure factor in the presence of disorder as well. Strong antiferromagnetic correlation, which is characteristic of the Mott insulator, is destroyed by a finite amount of disorder.

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