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APS » Journals » Phys. Rev. B » Volume 45 » Issue 13
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Phys. Rev. B 45, 7544–7546 (1992)

Quasiparticle gap in a two-dimensional Kosterlitz-Thouless superconductor

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Adriana Moreo and Douglas J. Scalapino
Department of Physics, University of California, Santa Barbara, California 93106-9530

Steven R. White
Department of Physics, University of California, Irvine, California 92717

Received 13 September 1991; published in the issue dated 1 April 1992

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.

© 1992 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.45.7544
DOI:
10.1103/PhysRevB.45.7544
PACS:
75.10.Jm, 75.40.Mg, 75.40.Cx, 75.40.Gb
 
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