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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2003

Delocalizing effect of the Hubbard repulsion for electrons on a two-dimensional disordered lattice

Giuliano Benenti
  • Fonction : Auteur
Dima Shepelyansky

Résumé

We study numerically the ground-state properties of the repulsive Hubbard model for spin-1/2 electrons on two-dimensional lattices with disordered on-site energies. The projector quantum Monte Carlo method is used to obtain very accurate values of the ground-state charge density distributions with $N_p$ and $N_p+1$ particles. The difference in these charge densities allows us to study the localization properties of an added particle. The results obtained at quarter-filling on finite clusters show that the Hubbard repulsion has a strong delocalizing effect on the electrons in disordered 2D lattices. However, numerical restrictions do not allow us to reach a definite conclusion about the existence of a metal-insulator transition in the thermodynamic limit in two-dimensions.

Dates et versions

hal-00120705 , version 1 (16-12-2006)

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Citer

Bhargavi Srinivasan, Giuliano Benenti, Dima Shepelyansky. Delocalizing effect of the Hubbard repulsion for electrons on a two-dimensional disordered lattice. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2003, 67 (20), pp.205112. ⟨10.1103/PhysRevB.67.205112⟩. ⟨hal-00120705⟩
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