首页|Flux phases in the extended Hubbard model on the triangular lattice

Flux phases in the extended Hubbard model on the triangular lattice

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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.

flux statetriangular latticeHubbard model

Yuge Chen、Kun Jiang、Yi Zhang、Jiangping Hu

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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

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

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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Ministry of Science and TechnologyNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaStrategic Priority Research Program of the Chinese Academy of SciencesChinese Academy of Sciences through the Youth Innovation Promotion AssociationNew Cornerstone Investigator Program

2022YFA1403901NSFC-11888101NSFC-12174428NSFC-12074276NSFC-12274279XDB280000002022YSBR-048

2024

10.1007/s11433-024-2413-5

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
年,卷(期)：2024.67(9)