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28 March 2024
 
  » arxiv » cond-mat/9704136

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One-Electron Spectral Functions of the Attractive Hubbard Model for Intermediate Coupling
Maxim Yu. Kagan ; Raymond Frésard ; Massimiliano Capezzali ; Hans Beck ;
Date 16 Apr 1997
Subject cond-mat
AbstractWe calculate the one-electron spectral function of the attractive (negative-$U$) Hubbard model. We work in the intermediate coupling and low density regime and obtain the self-energy in an approximate analytical form. The excitation spectrum is found to consist of three branches. The results are obtained in a framework, based on the self-consistent T-matrix approximation, which is compatible with the Mermin-Wagner theorem.
Source arXiv, cond-mat/9704136
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