Temperature Derivative of the Superfluid Density in the Attractive Hubbard model

Details Temperature Derivative of the Superfluid Density in the Attractive Hubbard model Temperature Derivative of the Superfluid Density in the Attractive Hubbard model

1993-10-13

arxiv.org/abs/cond-mat/9310025v1

Physics

Condensed Matter

Latex 8 pages, 3 figures (in postscript format) appendded at the end of the file

Scientific paper

10.1103/PhysRevB.49.4327

Based on extensions of the grand-canonical Quantum Monte-Carlo algorithm to incorporate magnetic fields, we provide numerical data confirming the existence of a Kosterlitz-Thouless transition in the attractive Hubbard model. Here, we calculate the temperature derivative of the superfluid density, to pin down the transition. Away from half-band filling, the above quantity, shows a response which increases with lattice size at the transition temperature. In contrast, such a signal is not observed for the case of a half-band filling.

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