Anisotropic superconductivity in the 2D Hubbard model: Gap function and interaction weight
Chien-Hua Pao, N. E. Bickers
DOI 10.1103/PhysRevLett.72.1870 · Physical Review Letters
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Abstract
A potential dx2-y2 pairing state in the 2D Hubbard model is investigated within a conserving extension of Hartree-Fock theory known as the fluctuation exchange approximation. The self-consistent field equations are solved with the aid of a recently developed renormalization group approach for general models which lack a Migdal theorem. The calculations yield an anisotropic gap which saturates rapidly below Tc to a peak value of 2Δk/kTc∼10–12 for k along the kx and ky axes.
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