Investigation of the ground state of the anisotropic extended Hubbard chain at weak coupling

被引：4
作者：
Ding, Hanqin [1 ]
Zhang, Jun [1 ]
机构：
[1] Xinjiang Univ, Sch Phys Sci & Technol, Urumqi 830046, Peoples R China
来源：
PHYSICS LETTERS A | 2016年 / 380卷 / 40期
基金：
中国国家自然科学基金;
关键词：
Ground state; Anisotropic interaction; Weak coupling; Extended Hubbard chain; Bosonization; PHASE-DIAGRAM; TRIPLET SUPERCONDUCTIVITY; MODEL; TRANSITION;
D O I：
10.1016/j.physleta.2016.07.061
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We study a one-dimensional anisotropic extended Hubbard model, where the inter-site density (V) and exchange (J) interactions are spin-dependent. Use of bosonization and renormalization helps investigate phase diagram. At half filling, the ground state characterizes insulating phases. The spin-dependent repulsion leads to a bond-spin-density-wave (BSDW) phase. The antiferromagnetic exchange enhances the bond-order-wave (BOW) phase while weakens the charge-density-wave (CDW) phase. When J > 4V, the BSDW and CDW phases disappear. Away from half filling, the ground state exhibits superconducting behavior. The anisotropic interactions have an important effect on the phase structures. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：3292 / 3296
页数：5
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