Flux phases in the extended Hubbard model on the triangular lattice  

作　　者：Yuge Chen Kun Jiang Yi Zhang Jiangping Hu 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics and Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [2]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 [4]Shanghai Key Laboratory of High Temperature Superconductors and International Center of Quantum and Molecular Structures,Shanghai University,Shanghai 200444,China [5]Kavli Institute of Theoretical Sciences,University of Chinese Academy of Sciences,Beijing 100190,China [6]New Cornerstone Science Laboratory,Beijing 100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第9期148-153,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Ministry of Science and Technology(Grant No.2022YFA1403901);the National Natural Science Foundation of China(Grant Nos.NSFC-11888101,NSFC-12174428,NSFC-12074276,and NSFC-12274279);the Strategic Priority Research Program of the Chinese Academy of Sciences(Grant No.XDB28000000);the Chinese Academy of Sciences through the Youth Innovation Promotion Association(Grant No.2022YSBR-048);the New Cornerstone Investigator Program。

摘　　要：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.

关 键 词：flux state triangular lattice Hubbard model 

分 类 号：O469[理学—凝聚态物理]