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- W803814960 abstract "We revisit the metal-insulator transition for the single band Hubbard model on the Bethe lattice at finite temperatures, within the framework of the dynamical mean field theory (DMFT), in order to assess the quantitative reliability of the self-consistent hybridization expansion. We solve the impurity problem by means of the one-crossing approximation (OCA) version of the self-consistent hybridization expansion, as well as with the continuous-time quantum Monte Carlo (CT-QMC) method. The OCA critical values of the Coulomb repulsion U for the Mott transition at temperatures T below the critical one (Tc) are in good agreement with those obtained within the numerically-exact CT-QMC approach, as well as with previous (discrete-time) QMC calculations reported in the literature. Moreover, the coexistence region of the metal-insulator phase diagram is well described by the self-consistent approximation. The small deviations of the insulator-to-metal transition calculated within this formalism are explained in terms of the high-frequency expansion sum rules for the Green function, that indicate a slight underestimation of the size of the gap. Calculations for the non-symmetric case are also presented and discussed." @default.
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- W803814960 date "2015-06-19" @default.
- W803814960 modified "2023-09-24" @default.
- W803814960 title "Self-Consistent hybridization expansion calculations for the Mott transition phase diagram" @default.
- W803814960 hasPublicationYear "2015" @default.
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