Enhancement of the d_{x^2-y^2} pairing correlation in the two-dimensional Hubbard model: a quantum Monte Carlo study

Details Enhancement of the d_{x^2-y^2} pairing correlation in the two-dimensional Hubbard model: a quantum Monte Carlo study Enhancement of the d_{x^2-y^2} pairing correlation in the two-dimensional Hubbard model: a quantum Monte Carlo study

1997-07-28

arxiv.org/abs/cond-mat/9707277v1

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.56.R14287

Quantum Monte Carlo is used to investigate the possibility of d_{x^2-y^2} superconductivity in the two-dimensional repulsive Hubbard model. A small energy scale relevant to possible pairing requires a care (i.e., sufficiently small level separation between the $k$ points $(\delta k,\pi-\delta k')$ and $(\pi-\delta k'',\delta k''')$ with small $\delta k$'s) to detect enhanced correlations in finite-size studies, as motivated from a previous study on Hubbard ladders. Our calculation indeed detects long-tailed enhancements in the d_{x^2-y^2} pairing correlation when the system is near, but not exactly at, half-filling.

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