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Physical Review Letters
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Superfluid density and the drude weight of the hubbard model

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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. © 1992 The American Physical Society.

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Physical Review Letters

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