A consistent description of the pairing symmetry in hole and electron doped cuprates within the two dimensional Hubbard model

Details A consistent description of the pairing symmetry in hole and electron doped cuprates within the two dimensional Hubbard model A consistent description of the pairing symmetry in hole and electron doped cuprates within the two dimensional Hubbard model

1997-10-02

arxiv.org/abs/cond-mat/9710019v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTeX, uses epsf.sty and multicol.sty

Scientific paper

10.1143/JPSJ.67.1533

Quantum Monte Carlo is used to calculate various pairing correlations of the 2D Hubbard model possessing band features experimentally observed in the cuprates. In the hole-doped case, where the Fermi level lies close to the van Hove singularities around $(0,\pi)$, the d$_{x^2-y^2}$ pairing correlation is selectively enhanced, while in the electron-doped case, where the singularities are far below the Fermi level and the Fermi surface runs through $(\pm \pi/2,\pm \pi/2)$, both d$_{x^2-y^2}$ and d$_{xy}$ correlations are enhanced with the latter having a $\sqrt{2}\times \sqrt{2}$ structure. The two pairing symmetries can mix to result in a nodeless gap.

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