中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(9) ：148-153.DOI:10.1007/s11433-024-2413-5

Flux phases in the extended Hubbard model on the triangular lattice

Yuge Chen Kun Jiang Yi Zhang Jiangping Hu
中国科学:物理学 力学 天文学(英文版)2024，Vol.67Issue(9) ：148-153.DOI:10.1007/s11433-024-2413-5
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  • 万方数据

Flux phases in the extended Hubbard model on the triangular lattice

Yuge Chen 1Kun Jiang 2Yi Zhang 3Jiangping Hu4
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作者信息

  • 1. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China
  • 2. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China
  • 3. Department of Physics and Institute for Quantum Science and Technology,Shanghai University,Shanghai 200444,China;Shanghai Key Laboratory of High Temperature Superconductors and International Center of Quantum and Molecular Structures,Shanghai University,Shanghai 200444,China
  • 4. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China;New Cornerstone Science Laboratory,Beijing 100190,China
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Abstract

Using the unrestricted Hartree-Fock variational method,we study the extended Hubbard model in the triangular lattice at 3/4 fill-ing.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.

Key words

flux state/triangular lattice/Hubbard model

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基金项目

Ministry of Science and Technology(2022YFA1403901)

National Natural Science Foundation of China(NSFC-11888101)

National Natural Science Foundation of China(NSFC-12174428)

National Natural Science Foundation of China(NSFC-12074276)

National Natural Science Foundation of China(NSFC-12274279)

Strategic Priority Research Program of the Chinese Academy of Sciences(XDB28000000)

Chinese Academy of Sciences through the Youth Innovation Promotion Association(2022YSBR-048)

New Cornerstone Investigator Program()

出版年

2024
中国科学:物理学 力学 天文学(英文版)
中国科学院

中国科学:物理学 力学 天文学(英文版)

CSTPCD
影响因子：0.91
ISSN：1674-7348
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