Incipient antiferromagnetism and low-energy excitations in the half-filled two-dimensional Hubbard model

Abstract

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 Re $\Sigma ({\mathbf{k}}_F,\epsilon )$ and a local maximum in $|$Im $\Sigma ({\mathbf{k}}_F,\epsilon )|$ at $\epsilon =0$. We explain these results using a simple spin-fluctuation model.

submitted to Physical Review Letters 9 March 1995

References in corpus (2)

• Correlated Electrons in High Temperature Superconductors
• Spectral weight function for the half-filled Hubbard model: a singular value decomposition approach

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