Importance of local correlations for the order parameter of high-Tc superconductors

Abstract

It is shown that local temporal correlations in addition to non-local spatial correlations are important to understand the size and the doping dependence of the d-wave superconducting order parameter of high-temperature superconductors. To this end, the hole- and electron-doped two-dimensional Hubbard model at zero temperature is considered and treated by an extension of the variational cluster approximation. Within this approach, the effects of temporal correlations can be studied systematically and in a thermodynamically consistent way by comparing results obtained from different reference clusters. Contact can be made with previous cellular (plaquette) dynamical mean-field calculations. This shows that temporal correlations considerably decrease the order parameter and provide a substantial gain of binding energy. Besides, a few methodical insights regarding real-space quantum-cluster approaches are obtained in addition.

7 pages, 5 figures, v2 with extended discussion

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Cited by in corpus (8)

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• Rashba spin orbit coupling in the Kane-Mele-Hubbard model
• An organizing principle for two-dimensional strongly correlated superconductivity
• Density wave instabilities and surface state evolution in interacting Weyl semimetals
• Variational cluster approach to thermodynamic properties of interacting fermions at finite temperatures: A case study of the two-dimensional single-band Hubbard model at half filling
• Correlation-driven charge order in a frustrated two-dimensional atom lattice
• Pseudogap transition within the superconducting phase in the three-band Hubbard model
• Extended self-energy functional approach for strongly-correlated lattice bosons in the superfluid phase