Giovanni Sordi

Royal Holloway, University of London
Mott physics in the three-band model of the high temperature superconductors

High temperature superconductivity emerges in the CuO2 plane upon doping a Mott insulator. The Mott insulating state occurs in different regimes, Mott-Hubbard insulator and charge-transfer insulator. The latter is relevant especially for hole-doped cuprates. Within a three-band model we can explore both charge-transfer and Mott-Hubbard systems. To ascertain the influence of Mott physics plus shortrange correlations, we solve a three-band copper oxide model in the charge-transfer regime using cluster dynamical mean-field theory with continuous-time quantum Monte Carlo as an impurity solver. We report the normal-state phase diagram of this model as a function of doping, charge-transfer energy, interaction strength and temperature. Upon hole doping of the charge-transfer insulator, a firstorder transition occurs at finite doping between a pseudogap and a correlated metal. This transition is connected to the metal to charge-transfer insulator transition in the undoped model.

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