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29 March 2024
 
  » arxiv » cond-mat/0408074

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Pairing Fluctuations in The Attractive Hubbard Model in the Atomic Limit
S. Verga ; R.J. Gooding ; F. Marsiglio ;
Date 3 Aug 2004
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractBCS theory accounts for the pairing instability in the weak coupling limit, but fails to describe pairing fluctuations above $T_c$. One possibility for describing these fluctuations in the dilute limit is the T-matrix approximation. We critically examine various degrees of self-consistency in the T-matrix formalism, along with a non-diagrammatic two-particle self-consistent (TPSC) formulation, in the strong coupling regime, where an exact solution is readily available. We find that one particular degree of self-consistency is quite accurate, particularly at low temperature as evidenced by examining both static and dynamic properties.
Source arXiv, cond-mat/0408074
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