title: Strong coupling superconductivity, pseudogap, and Mott transition.
abstract: An intricate interplay between superconductivity, pseudogap, and Mott transition, either bandwidth driven or doping driven, occurs in materials. Layered organic conductors and cuprates offer two prime examples. We provide a unified perspective of this interplay in the two-dimensional Hubbard model within cellular dynamical mean-field theory on a 2×2 plaquette and using the continuous-time quantum Monte Carlo method as impurity solver. Both at half filling and at finite doping, the metallic normal state close to the Mott insulator is unstable to d-wave superconductivity. Superconductivity can destroy the first-order transition that separates the pseudogap phase from the overdoped metal, yet that normal state transition leaves its marks on the dynamic properties of the superconducting phase. For example, as a function of doping one finds a rapid change in the particle-hole asymmetry of the superconducting density of states. In the doped Mott insulator, the dynamical mean-field superconducting transition temperature T(c)(d) does not scale with the order parameter when there is a normal-state pseudogap. T(c)(d) corresponds to the local pair formation temperature observed in tunneling experiments and is distinct from the pseudogap temperature.
authors.affiliation: Theory Group, Institut Laue Langevin, Grenoble, France.
authors.forename: G
authors.initials: G
authors.lastname: Sordi
authors.forename: P
authors.initials: P
authors.lastname: Sémon
authors.forename: K
authors.initials: K
authors.lastname: Haule
authors.forename: A-M S
authors.initials: AM
authors.lastname: Tremblay