Enhancement of pairing correlation by t′ in the two-dimensional extended t-J model -: art. no. 227002

被引：94

作者：

Shih, CT ^{[1
]}

Lee, TK

Eder, R

Mou, CY

Chen, YC

机构：

[1] Tunghai Univ, Dept Phys, Taichung 40704, Taiwan

[2] Acad Sinica, Inst Phys, Nankang, Taiwan

[3] Forschungszentrum Karlsruhe, Inst Festkorperphys, Karlsruhe, Germany

[4] Natl Tsing Hua Univ, Dept Phys, Hsinchu, Taiwan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.92.227002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the effects of the next-nearest-neighbor (t') and the third-nearest-neighbor (t") hopping terms on superconductivity correlation in the 2D hole-doped extended t-J model based on the variational Monte Carlo, mean-field calculation and exact diagonalization method. Despite the diversity of the methods employed, the results all point to a consistent conclusion: While the d-wave superconductivity correlation is slightly suppressed by t' and t"(') in underdoped regions, it is greatly enhanced in the optimal and overdoped regions. The optimal T-c is a result of the balance of these two opposite trends.

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页码：227002 / 1

页数：4

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