Abstract
We study the superfluid density and the Drude weight of the Hubbard model by investigating two different limiting behaviors of the current-current correlation function. These quantities provide criteria which allow one to distinguish between superconducting, metallic, and insulating ground states of an interacting many-body system. Monte Carlo calculations are performed to study these quantities.
- Received 24 February 1992
DOI:https://doi.org/10.1103/PhysRevLett.68.2830
©1992 American Physical Society