Superconductivity and the Pseudogap in the two-dimensional Hubbard model

2012/07/31 by Emanuel Gull, Olivier Parcollet, Andrew J. Millis · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.110.216405

published as Phys. Rev. Lett. 110, 216405 (2013)

arxiv created 2013/05/29 · arxiv updated 2015/03/20

Abstract

Recently developed numerical methods have enabled the explicit construction of the superconducting state of the Hubbard model of strongly correlated electrons in parameter regimes where the model also exhibits a pseudogap and a Mott insulating phase. d_x²-y² symmetry superconductivity is found to occur in proximity to the Mott insulator, but separated from it by a pseudogapped nonsuperconducting phase. The superconducting transition temperature and order parameter amplitude are found to be maximal at the onset of the normal-state pseudogap. The emergence of superconductivity from the normal state pseudogap leads to a decrease in the excitation gap. All of these features are consistent with the observed behavior of the copper-oxide superconductors.

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