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. 2014 Jul 11;5:4353. doi: 10.1038/ncomms5353

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(a,b) The imaginary part of the electronic SE is calculated, as a function of the Matsubara frequency ω_n=(2n+1)πk_BT, by solving the single-band Hubbard model via single-site DMFT. The prototypical cases of the Mott insulator (p=0) and metallic system (p=0.2) are reported and contrasted. In the more realistic three-band Hubbard model, the same divergence of the SE is obtained as the charge-transfer insulating state is approached.