Quantum Monte Carlo evidence for d-wave pairing in the two-dimensional Hubbard model at a van Hove singularity

被引：36

作者：

Husslein, T ^{[1
]}

Morgenstern, I ^{[1
]}

Newns, DM ^{[1
]}

Pattnaik, PC ^{[1
]}

Singer, JM ^{[1
]}

Matuttis, HG ^{[1
]}

机构：

[1] UNIV REGENSBURG,FAK PHYS,D-93053 REGENSBURG,GERMANY

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 22期

关键词：

D O I：

10.1103/PhysRevB.54.16179

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We implement a quantum Monte Carlo calculation for a repulsive Hubbard model with nearest- and next-nearest-neighbor hopping interactions on clusters up to 12 x 12. A parameter region where the Fermi level lies close to the van Hove singularity at the saddle points in the bulk band structure is investigated. A pairing tendency in the d(x2-y2), symmetry channel, but no other channel, is found. Estimates of the effective pairing interaction show that it is close to the value required for a 40 K superconductor. Finite-size scaling compares with the attractive Hubbard model.

引用

页码：16179 / 16182

页数：4

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