Pairing Correlations in the Two-Dimensional Hubbard Model

Details Pairing Correlations in the Two-Dimensional Hubbard Model Pairing Correlations in the Two-Dimensional Hubbard Model

1997-03-02

arxiv.org/abs/cond-mat/9703017v1

Phys. Rev. Lett. 78, 4486 (1997)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, RevTex, 4 figures included; submitted to Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.78.4486

We present the results of a quantum Monte Carlo study of the extended $s$ and the $d_{x^2-y^2}$ pairing correlation functions for the two-dimensional Hubbard model, computed with the constrained-path method. For small lattice sizes and weak interactions, we find that the $d_{x^2-y^2}$ pairing correlations are stronger than the extended $s$ pairing correlations and are positive when the pair separation exceeds several lattice constants. As the system size or the interaction strength increases, the magnitude of the long-range part of both correlation functions vanishes.

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