Ring exchange mechanism for triplet superconductivity in a two-chain Hubbard model

被引：1

作者：

Ohta, Y

Nishimoto, S

Shirakawa, T

Yamaguchi, Y

机构：

[1] Chiba Univ, Dept Phys, Chiba 2638522, Japan

[2] Univ Gottingen, Inst Theoret Phys, D-37077 Gottingen, Germany

[3] Chiba Univ, Grad Sch Sci & Technol, Chiba 2638522, Japan

来源：

PHYSICA B-CONDENSED MATTER | 2006年 / 378-80卷

关键词：

triplet superconductivity; ring exchange; Hubbard model; zigzag ladder; DMRG;

D O I：

10.1016/j.physb.2006.01.176

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The density matrix renormalization group (DMRG) method is used to calculate the binding energy of electrons and pair correlation functions in the two-chain zigzag-bond Hubbard model at quarter filling. We show that the ground state of the model can be superconducting in the spin-triplet channel when we make an appropriate choice of the signs of hopping integrals for the ferromagnetic ring-exchange mechanism to work. Possible relevance of our mechanism to the triplet superconductivity observed in (TMTSF)(2)X is discussed. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：439 / 440

页数：2