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PHYSICS LETTERS A
Volume 282, Issue 4-5, Pages 319-324Publisher
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DOI: 10.1016/S0375-9601(01)00201-8
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We propose a fully microscopic theory of the anomalous normal state of the attractive Hubbard model in the low-density limit that accounts for propagator renormalization. Our analytical conclusions regarding the thermodynamic instabilities contained in the self-consistent equations associated with this formulation have been verified by our comprehensive numerical study of the same equations. The resulting theory is found to contain no transitions at non-zero temperatures for all finite lattices, and we have confirmed, using our numerical studies, that this behaviour persists in the thermodynamic limit for low-dimensional systems. (C) 2001 Elsevier Science B.V. All rights reserved.
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