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• W2803584401 abstract "We apply the dual fermion approach with a second-order approximation to the self-energy to the Mott transition in the two-dimensional Hubbard model. The approximation captures nonlocal dynamical short-range correlations as well as several features observed in studies using cluster dynamical mean-field theory. This includes a strong reduction of the critical interaction and inversion of the slope of the transition lines with respect to single-site dynamical mean-field theory. We show that these effects coincide with a much smaller momentum differentiation compared to cluster methods. We further discuss the role of the self-consistency condition and show that the approximation behaves as an asymptotic series at low temperature." @default.
• W2803584401 created "2018-06-01" @default.
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• W2803584401 date "2018-10-08" @default.
• W2803584401 modified "2023-10-05" @default.
• W2803584401 title "Second-order dual fermion approach to the Mott transition in the two-dimensional Hubbard model" @default.
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• W2803584401 doi "https://doi.org/10.1103/physrevb.98.155117" @default.
• W2803584401 hasPublicationYear "2018" @default.
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