Abstract
The negative-U Hubbard model, doped away from half filling, is believed to undergo a Kosterlitz-Thouless transition into a superconducting state with power-law pair-field correlations. We have used numerical simulation techniques to calculate the temperature dependence of the spin susceptibility and the single-particle density of states. These quantities show that a gap in the single-particle spectrum develops for a two-dimensional layer in the Kosterlitz-Thouless state.
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