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      Quasiparticle lifetime behaviour in a simplified self-consistent T-matrix treatment of the attractive Hubbard model in 2D

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          Abstract

          The attractive Hubbard model on a 2-D square lattice is studied at low electronic densities using the ladder approximation for the pair susceptibility. This model includes (i) the short coherence lengths known to exist experimentally in the cuprate superconductors, and (ii) two-particle bound states that correspond to electron pairs. We study the quasiparticle lifetimes in both non self-consistent and self-consistent theories, the latter including interactions between the pairs. We find that if we include the interactions between pairs the quasiparticle lifetimes vary approximately linearly with the inverse temperature, consistent with experiment.

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          Journal
          10 February 1998
          10.1016/S0921-4526(97)00732-1
          cond-mat/9802109
          Custom metadata
          KOMA-98-04
          Physica B 241-243, 835-838 (1997)
          2 pages, including 2 figures, to appear in the proceedings of the ICNS '97
          cond-mat.str-el cond-mat.supr-con

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