Abstract
We study the temperature-dependent conductivity and spin susceptibility of the two-dimensional disordered Hubbard model. Calculations of the current-current correlation function using a quantum Monte Carlo method show that repulsion between electrons can significantly enhance the conductivity, and at low temperatures change the sign of 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 .
- Received 1 April 1999
DOI:https://doi.org/10.1103/PhysRevLett.83.4610
©1999 American Physical Society