Phys. Rev. Lett. 76, 1312–1315 (1996)Incipient Antiferromagnetism and Low-Energy Excitations in the Half-Filled Two-Dimensional Hubbard ModelReceived 8 March 1995; published in the issue dated 19 February 1996 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,ɛ) and a local maximum in |ImΣ(kF,ɛ)| at ɛ = 0. We explain these results using a simple spin-fluctuation model. © 1996 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.76.1312
DOI:
10.1103/PhysRevLett.76.1312
PACS:
71.27.+a, 75.10.Lp, 75.30.Kz
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