Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model
Strongly Correlated Electrons
2007-05-23 v2 Superconductivity
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.
Keywords
Cite
@article{arxiv.cond-mat/0208057,
title = {Third Order Perturbation Analysis of Pairing Symmetry in Two-Dimensional Hubbard Model},
author = {Hirono Fukazawa and Kosaku Yamada},
journal= {arXiv preprint arXiv:cond-mat/0208057},
year = {2007}
}
Comments
10 pages, 11 figures