Antiferromagnetism and single-particle properties in the two-dimensional half-filled Hubbard model: Slater vs Mott-Heisenberg

Abstract

We study antiferromagnetism and single-particle properties in the two-dimensional half-filled Hubbard model at low temperature. Collective spin fluctuations are governed by a non-linear sigma model that we derive from the Hubbard model for any value of the Coulomb repulsion. As the Coulomb repulsion increases, the ground state progressively evolves from a Slater to a Mott-Heisenberg antiferromagnet. At finite temperature, we find a metal-insulator transition between a pseudogap phase at weak coupling and a Mott-Hubbard insulator at strong coupling.

arXiv commentRevised version, to appear in EuroPhys. Letters (epl style included)

References in corpus (4)

• Non-perturbative many-body approach to the Hubbard model and single-particle pseudogap
• Absence of a Slater Transition in The Two-Dimensional Hubbard Model
• Spin fluctuations and pseudogap in the two-dimensional half-filled Hubbard model at weak coupling
• Classical Phase Fluctuations in Incommensurate Peierls Chains

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