Investigation of a four-body coupling in the one-dimensional extended Penson-Kolb-Hubbard model

被引：0
|
作者：
Ding, Hanqin [1 ]
Ma, Xiaojuan [1 ]
Zhang, Jun [1 ]
机构：
[1] Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830046, Peoples R China
来源：
PHYSICS LETTERS A | 2017年 / 381卷 / 36期
基金：
中国国家自然科学基金;
关键词：
Phase diagram; One dimension; Penson-Kolb-Hubbard model; Four-body coupling; Superconductivity; PAIR-HOPPING INTERACTION; TRANSVERSE SPIN ANISOTROPY; ITINERANT-ELECTRON SYSTEM; TRIPLET SUPERCONDUCTIVITY; GROUND-STATE; INTERACTING FERMIONS; OPTICAL LATTICE; PHASE-DIAGRAM; TEMPERATURE; TRANSITION;
D O I：
10.1016/j.physleta.2017.07.042
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The experimental advances in cold fermion gases motivates the investigation of a one-dimensional (1D) correlated electronic system by incorporating a four-body coupling. Using the low-energy field theory scheme and focusing on the weak-coupling regime, we extend the 1D Penson-Kolb-Hubbard (PKH) model at half filling. It is found that the additional four-body interaction may significantly modify the quantum phase diagram, favoring the presence of the superconducting phase even in the case of two body repulsions. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：3119 / 3123
页数：5
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