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

T. Saikawa and A. Ferraz
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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

The European Physical Journal B: Condensed Matter and Complex Systems, 2001, vol. 20, issue 1, 65-74

Abstract: 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.

Keywords: PACS. 71.27.+a Strongly correlated electron systems; heavy fermions – 71.10.Fd Lattice fermion models (Hubbard model, etc.) (search for similar items in EconPapers)
Date: 2001
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DOI: 10.1007/PL00011093

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