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Insulators, metals, pseudogaps and cuprate superconductivity

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If you have a question about this talk, please contact Helen Verrechia.

Band theory and the BCS theory of superconductivity are the most successful theories of standard solid state physics. The failure of band theory became apparent in the 1940’s when it was realized that because of strong interactions, half-filled-band materials that should have been metallic were instead insulators, so-called Mott insulators. The failure of BSC theory became apparent in the 1970’s when superconductivity was discovered in the presence of strong repulsion instead of weak phonon-mediated attraction. In this talk, I will present the results of Cluster Dynamical Mean-Field Theory calculations for the simplest model that embodies the physics of strong interactions, the one-band Hubbard model. The resulting phase diagram shows that the effect of strong-interactions, or of Mott physics if you want, extends far from half-filling. In particular, the phase diagram contains a first-order transition in the normal state at finite doping as well as d-wave superconductivity. The first-order transition separates a pseudogap phase from a correlated metallic state. The pseudogap does not break symmetry and does not come from precursor Cooper pairs. The pseudogap temperature follows the so-called Widom-line of the first order transition, a concept that I will explain. I will show that the phenomenology of the pseudogap and of superconductivity found for strong interactions is very close to that of hole-doped high-temperature superconductors.

This talk is part of the Quantum Matter Seminar series.

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