Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model

Abstract

We study the superconducting instabilities of singlet and triplet pairing in a two-dimensional Hubbard model on the basis of the third-order perturbation theory (TOPT). We investigate the effect of the vertex correction that is given by TOPT, comparing with the study with only the second-order effective interaction. In our results, a stable p-wave pairing state spreads from low to intermediate electron density. A dx2-y2-wave pairing is dominant for the high density near a half-filling. It is shown that the vertex correction plays an essential role in making the p-wave pairing state dominant.

arXiv comment10 pages, 11 figures

References in corpus (3)

• d- and p-wave superconductivity mediated by spin fluctuations in two- and three-dimensional single-band repulsive Hubbard model
• Superfluid Transition Temperature in a Fermi Gas with Repulsion. Higher Orders Perturbation Theory Corrections
• Perturbation Theory on the Transition Temperature and Electronic Properties of Organic Superconductor

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