Electronic Instability of Kagome Metal CsV_(3)Sb_(5) in the 2×2×2 Charge Density Wave State  

作　　者：朱红恩 李彤瑞 喻芳航 李昱良 王盛 吴云波 刘站锋 尚政明 崔胜涛 刘毅 张国斌 张李东 王震宇 吴涛 应剑俊 陈仙辉 孙喆 Hongen Zhu;Tongrui Li;Fanghang Yu;Yuliang Li;Sheng Wang;Yunbo Wu;Zhanfeng Liu;Zhengming Shang;Shengtao Cui;Yi Liu;Guobin Zhang;Lidong Zhang;Zhenyu Wang;Tao Wu;Jianjun Ying;Xianhui Chen;Zhe Sun(National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China;Department of Physics,CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China;CAS Center for Excellence in Quantum Information and Quantum Physics,Hefei 230026,China;Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China;CAS Center for Excellence in Superconducting Electronics(CENSE),Shanghai 200050,China)

机构地区：[1]National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China [2]Department of Physics,CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China [3]CAS Center for Excellence in Quantum Information and Quantum Physics,Hefei 230026,China [4]Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China [5]CAS Center for Excellence in Superconducting Electronics(CENSE),Shanghai 200050,China

出　　处：《Chinese Physics Letters》2023年第4期56-61,共6页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China (Grant No.2017YFA0402901);the National Natural Science Foundation of China (Grant No.U2032153);the Strategic Priority Research Program of the Chinese Academy of Sciences (Grant No.XDB25000000);the Users with Excellence Program of Hefei Science Center of the Chinese Academy of Sciences (Grant No.2021HSC-UE004)。

摘　　要：Recently discovered kagome metals AV_(3)Sb_(5)(A=K,Rb,and Cs)provide an ideal platform to study the correlation among nontrivial band topology,unconventional charge density wave(CDW),and superconductivity.The evolution of electronic structures associated with the change of lattice modulations is crucial for understanding of the CDW mechanism,with the combination of angle-resolved photoemission spectroscopy(ARPES)measurements and density functional theory calculations,we investigate how band dispersions change with the increase of lattice distortions.In particular,we focus on the electronic states around M point,where the van Hove singularities are expected to play crucial roles in the CDW transition.Previous ARPES studies reported a spectral weight splitting of the van Hove singularity around M point,which is associated with the 3D lattice modulations.Our studies reveal that this“splitting”can be connected to the two van Hove singularities at k_(z)=0 and k_(z)=π/c in the normal states.When the electronic system enters into the CDW state,both van Hove singularities move down.Such novel properties are important for understanding of the CDW transition.

关 键 词：transition SPLITTING LATTICE 

分 类 号：O469[理学—凝聚态物理]