依赖自旋的一维半满扩展Hubbard模型的基态相图演化（英文）

林二印; 丁汉芹; 张军

doi:10.13568/j.cnki.651094.2015.02.02

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依赖自旋的一维半满扩展Hubbard模型的基态相图演化（英文）

更新时间：2026-01-21

- 依赖自旋的一维半满扩展Hubbard模型的基态相图演化（英文）
- Journal of Xinjiang University (Natural Science Edition in Chinese and English) Vol. 32, Issue 2, Pages: 134-139(2015)
- 作者机构：
  
  1. 新疆大学物理科学与技术学院
  2. 中国科学院理论物理研究所理论物理国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13568/j.cnki.651094.2015.02.02
  CLC： O469
- Published：2015
- 稿件说明：
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[1]林二印,丁汉芹,张军.依赖自旋的一维半满扩展Hubbard模型的基态相图演化（英文）[J].新疆大学学报(自然科学版),2015,32(02):134-139+156.
[1]林二印,丁汉芹,张军.依赖自旋的一维半满扩展Hubbard模型的基态相图演化（英文）[J].新疆大学学报(自然科学版),2015,32(02):134-139+156. DOI： 10.13568/j.cnki.651094.2015.02.02.

DOI：10.13568/j.cnki.651094.2015.02.02.

摘要

在场论的框架下

利用费米–玻色转化技术及重整化技术

研究了在弱耦合条件下

依赖自旋的最近邻相互作用下的一维半满Hubbard(U-V⊥-V||)扩展模型基态的相图演化行为.结果显示

随着相对偏离参数δ的增大

基态相图中的SDW±关联和SDWz关联分别增强;然而bd-SDW±关联和CDW关联依次减弱.这意味着

依赖自旋的最近邻相互作用在多电子系统中可能是真实的

它的存在为理解一维强关联系统中绝缘相(CDW

SDW±

z和bdSDW±

z)的竞争提供了一种图景和参考.

Abstract

A half-filled one-dimensional extended(U-V⊥-V||) Hubbard chain with nearest-neighbor spin-dependent repulsion(V⊥

V||> 0) in the weak-coupling regime has been considered

combining the bosonization with the renormalization group method to obtain phase topological structures. The results show that a strong enhancement of tendencies towards SDW±and SDWzphases is caused by the competition between the spin-independent interactions related to the case of V⊥and V||repulsion

respectively

with the relative deviation parameter δ increasing

but bd-SDW±and CDW orderings gradually vanish in the electron system in this case. Such a result indicates that nearest neighbor spin-dependent repulsion might present in a more realistic electron system

providing a further insight into the competition for insulating CDW

SDW±

zand bd-SDW±

zorderings in the quasi-1D strongly correlated physics.

关键词

Keywords

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