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Phys Rev Lett. 2013 May 24;110(21):216405. Epub 2013 May 22.

Superconductivity and the pseudogap in the two-dimensional Hubbard model.

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1
Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, USA.

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(x(2)-y(2)) 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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