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Extended Crossover from a Fermi Liquid to a Quasiantiferromagnet in the Half-Filled 2D Hubbard Model

Research output: Contribution to journalArticle

Fedor Simkovic, James LeBlanc, Aaram Joo Kim, Youjin Deng, Nikolay Prokof'ev, Boris Svistunov, Evgeny Kozik

Original languageEnglish
Article number017003
Pages (from-to)017003
Number of pages6
JournalPhysical Review Letters
Volume124
Issue number1
DOIs
Publication statusPublished - 10 Jan 2020

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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.

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