Extended crossover from Fermi liquid to quasi-antiferromagnet in the half-filled 2D Hubbard model
arXiv:1812.11503 · doi:10.1103/PhysRevLett.124.017003
Abstract
The ground state of the Hubbard model with nearest-neighbor hopping on the square lattice at half filling is known to be that of an antiferromagnetic (AFM) band insulator for any on-site repulsion. At finite temperature, the absence of long-range order makes the question of how the interaction-driven insulator is realized nontrivial. We address this problem with controlled accuracy in the thermodynamic limit using self-energy diagrammatic determinant Monte Carlo and dynamical cluster approximation methods and show that development of long-range AFM correlations drives an extended crossover from Fermi liquid to insulating behavior in the parameter regime that precludes a metal-to-insulator transition. The intermediate crossover state is best described as a non-Fermi liquid with a partially gapped Fermi surface.
arXiv comment6 pages, 4 figures, with supplemental material: 2 pages, 3 figures
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