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Conducting phase in the two-dimensional disordered Hubbard model | | P. J. H. Denteneer
; R. T. Scalettar
; N. Trivedi
; | | Date: |
17 Jul 1999 | | Journal: | Phys. Rev. Lett. 83, 4610 (1999) | | Subject: | Disordered Systems and Neural Networks; Strongly Correlated Electrons | cond-mat.dis-nn cond-mat.str-el | | Affiliation: | Lorentz Institute, University of Leiden), R. T. Scalettar (University of California, Davis), and N. Trivedi (Tata Institute of Fundamental Research, Mumbai | | Abstract: | We study the temperature-dependent conductivity $sigma(T)$ and spin susceptibility $chi(T)$ of the two-dimensional disordered Hubbard model. Calculations of the current-current correlation function using the Determinant Quantum Monte Carlo method show that repulsion between electrons can significantly enhance the conductivity, and at low temperatures change the sign of $dsigma/dT$ from positive (insulating behavior) to negative (conducting behavior). This result suggests the possibility of a metallic phase, and consequently a metal-insulator transition,in a two-dimensional microscopic model containing both interactions and disorder. The metallic phase is a non-Fermi liquid with local moments as deduced from a Curie-like temperature dependence of $chi(T)$. | | Source: | arXiv, cond-mat/9907246 | | Services: | Forum | Review | PDF | Favorites | |
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