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Remnant Fermi surface in a pseudogap regime of the two-dimensional Hubbard model at finite temperature

Author

Listed:
  • T. Saikawa

    (Laboratório de Supercondutividade, Centro Internacional de Fısica da Matéria Condensada, Universidade de Brasılia, CEP 70919-970 Brasılia-DF, Brazil)

  • A. Ferraz

    (Laboratório de Supercondutividade, Centro Internacional de Fısica da Matéria Condensada, Universidade de Brasılia, CEP 70919-970 Brasılia-DF, Brazil)

Abstract

A precursor effect on the Fermi surface in the two-dimensional Hubbard model at finite temperatures near the antiferromagnetic instability is studied using three different itinerant approaches: the second order perturbation theory, the paramagnon theory (PT), and the two-particle self-consistent (TPSC) approach. In general, at finite temperature, the Fermi surface of the interacting electron systems is not sharply defined due to the broadening effects of the self-energy. In order to take account of those effects we consider the single-particle spectral function A( , 0) at the Fermi level, to describe the counterpart of the Fermi surface at T = 0. We find that the Fermi surface is destroyed close to the pseudogap regime due to the spin-fluctuation effects in both PT and TPSC approaches. Moreover, the top of the effective valence band is located around = (π/2,π/2) in agreement with earlier investigations on the single-hole motion in the antiferromagnetic background. A crossover behavior from the Fermi-liquid regime to the pseudogap regime is observed in the electron concentration dependence of the spectral function and the self-energy.

Suggested Citation

  • T. Saikawa & A. Ferraz, 2001. "Remnant Fermi surface in a pseudogap regime of the two-dimensional Hubbard model at finite temperature," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 20(1), pages 65-74, March.
    • Handle: RePEc:spr:eurphb:v:20:y:2001:i:1:d:10.1007_pl00011093
    DOI: 10.1007/PL00011093
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