"Mott physics in cuprates: insights from cluster dynamical mean-field theory”
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Abstract:
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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. 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
Tcd does not scale with the order parameter when there is a normal-state
pseudogap Tcd corresponds to the local pair formation temperature observed
in tunneling experiments and is distinct from the pseudogap temperature.
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G. Sordi et al., PRL 104, 226402 (2010); G. Sordi et al., PRB 84,
075161 (2011); G. Sordi et al., arXiv:1110.1392 (2011); G. Sordi et
al.,arXiv:1201.1283 (2012).