We present single-particle and thermodynamic properties of the half-filled single-band Hubbard model in 2D calculated in the self-consistent fluctuation exchange approximation. The low-energy excitations at moderate temperatures and small U are quasiparticles with a short lifetime. As the temperature is lowered, coupling to evolving spin fluctuations leads to the extinction of these quasiparticles, signaled by a weak pseudogap in the density of states and by a positive slope in ReΣ(kF,ε) and a local maximum in |ImΣ(kF,ε)| at ε0ex0ex=0ex0ex0. We explain these results using a simple spin-fluctuation model.
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Deisz et al. (1996) studied this question.
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