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
收藏
页码：439 / 440
页数：2
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