Phase diagram of the Hubbard chain with symmetric density-dependent hopping

IF 4.4 2区物理与天体物理 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Results in Physics Pub Date : 2024-09-23 DOI:10.1016/j.rinp.2024.107983

Xin Sun , Weiting Chen , Hanqin Ding

引用次数: 0

Abstract

By the bosonization and renormalization-group schemes, a half-filled Hubbard chain with density-dependent hopping is investigated at weak coupling. The model involved has an electron–hole symmetry and an SO(4) symmetry. The phase diagram consists of three different phases divided by a charge transition at on-site repulsion

U = U_{c}

and a spin transition at

U = U_{s}

, with

U_{s} = - U_{c} = \frac{16}{π} (t_{c} - 1)

, including a Mott insulator with the SDW correlation, a dimerized insulator with the BCDW correlation, and a Luttinger metal with the coexisting TS and BSDW correlations. The effective three-body repulsion (

t_{c} - 1 > 0

) and attraction (

t_{c} - 1 < 0

) induce the dimerized and metallic phases, respectively.

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具有对称密度跳变的哈伯德链相图

通过玻色子化和重正化群方案，研究了在弱耦合下具有密度依赖性跳变的半填充哈伯德链。该模型具有电子-空穴对称性和 SO(4) 对称性。相图由三个不同的相组成，分别是现场斥力 U=Uc 时的电荷转换和 U=Us 时的自旋转换（Us=-Uc=16π(tc-1)），包括具有 SDW 相关性的莫特绝缘体、具有 BCDW 相关性的二聚绝缘体和具有共存 TS 和 BSDW 相关性的卢廷格金属。有效的三体斥力（tc-1>0）和吸引力（tc-1<0）分别诱导出二聚体和金属相。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Results in Physics MATERIALS SCIENCE, MULTIDISCIPLINARYPHYSIC-PHYSICS, MULTIDISCIPLINARY

CiteScore

8.70

自引率

9.40%

发文量

754

审稿时长

50 days

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