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

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

2002-08-03

arxiv.org/abs/cond-mat/0208057v2

J. Phys. Soc. Jpn. 71 (2002) 1541

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 11 figures

Scientific paper

10.1143/JPSJ.71.1541

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.

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