三角形晶格上扩展哈伯德模型的通量相位

IF 6.4 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Science China Physics, Mechanics & Astronomy Pub Date : 2024-08-01 DOI:10.1007/s11433-024-2413-5

Yuge Chen, Kun Jiang, Yi Zhang, Jiangping Hu

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引用次数: 0

摘要

我们使用无限制哈特里-福克变分法研究了三角形晶格中 3/4 填充的扩展哈伯德模型。由于费米面的嵌套不稳定性，通过调整同位和近邻斥力 U 和 V，我们发现了与 2 × 2 超级晶胞兼容的各种密度波态作为基态。由于时间反转对称性的自发破缺，它们还获得了非奇特的拓扑特性。我们的研究表明，相关电子系统中的短程斥力相互作用可以稳定通量相。

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Flux phases in the extended Hubbard model on the triangular lattice

Using the unrestricted Hartree-Fock variational method, we study the extended Hubbard model in the triangular lattice at 3/4 filling. Due to the nesting instability of the Fermi surface, various density wave states compatible with the 2 × 2 supercell are found as the ground state by tuning the onsite and nearest neighbor repulsions U and V. Surprisingly, the flux phases with complex bond order parameters are realized in a wide range of the U-V phase diagram. They also acquire nontrivial topological properties due to the spontaneous breaking of the time-reversal symmetry. Our study suggests that the flux phases can be stabilized by the interplay between short-range repulsive interactions in correlated electron systems.

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来源期刊

Science China Physics, Mechanics & Astronomy PHYSICS, MULTIDISCIPLINARY-

CiteScore

10.30

自引率

6.20%

发文量

4047

审稿时长

3 months

期刊介绍： Science China Physics, Mechanics & Astronomy, an academic journal cosponsored by the Chinese Academy of Sciences and the National Natural Science Foundation of China, and published by Science China Press, is committed to publishing high-quality, original results in both basic and applied research. Science China Physics, Mechanics & Astronomy, is published in both print and electronic forms. It is indexed by Science Citation Index. Categories of articles: Reviews summarize representative results and achievements in a particular topic or an area, comment on the current state of research, and advise on the research directions. The author’s own opinion and related discussion is requested. Research papers report on important original results in all areas of physics, mechanics and astronomy. Brief reports present short reports in a timely manner of the latest important results.