Evolution of the Dynamical Pairing across the Phase Diagram of a Strongly Correlated High-Temperature Superconductor

M. Civelli

doi:10.1103/PhysRevLett.103.136402

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Evolution of the Dynamical Pairing across the Phase Diagram of a Strongly Correlated High-Temperature Superconductor

M. Civelli

DOI 10.1103/PhysRevLett.103.136402 · Physical Review Letters

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Abstract

We study the dynamics of the Cooper pairing across the T=0 phase diagram of the two-dimensional Hubbard model, relevant for high-temperature superconductors, using a cluster extension of dynamical mean-field theory. We find that the superconducting pairing function evolves from an unconventional form in the overdoped region into a more conventional boson-mediated retarded form in the underdoped region of the phase diagram. The boson, however, promotes the rise of a pseudogap in the electron density of states rather than a superconducting gap as in the standard theory of superconductivity. We discuss our results in terms of Mott-related phenomena, and we show that they can be observed in tunneling experiments.