Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model

Details Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model Disorder and Interaction in 2D: Exact diagonalization study of the Anderson-Hubbard-Mott model

2000-02-18

arxiv.org/abs/cond-mat/0002304v2

Physics

Condensed Matter

Strongly Correlated Electrons

13 pages, 2 figures Revised version. Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.86.2388

We investigate, by numerically calculating the charge stiffness, the effects of random diagonal disorder and electron-electron interaction on the nature of the ground state in the 2D Hubbard model through the finite size exact diagonalization technique. By comparing with the corresponding 1D Hubbard model results and by using heuristic arguments we conclude that it is \QTR{it}{unlikely} that there is a 2D metal-insulator quantum phase transition although the effect of interaction in some range of parameters is to substantially enhance the non-interacting charge stiffness.

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