Electronic Instability of Kagome Metal CsV3Sb5 in the 2 × 2 × 2 Charge Density Wave State

• Published in: Chinese physics letters Vol. 40; no. 4; pp. 64 - 69
• Main Authors: Zhu, Hongen, Li, Tongrui, Yu, Fanghang, Li, Yuliang, Wang, Sheng, Wu, Yunbo, Liu, Zhanfeng, Shang, Zhengming, Cui, Shengtao, Liu, Yi, Zhang, Guobin, Zhang, Lidong, Wang, Zhenyu, Wu, Tao, Ying, Jianjun, Chen, Xianhui, Sun, Zhe
• Format: Journal Article
• Language: English
• Published: Chinese Physical Society and IOP Publishing Ltd 01.04.2023; 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%Department of Physics,CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China; Department of Physics,CAS Key Laboratory of Strongly-coupled Quantum Matter Physics,University of Science and Technology of China,Hefei 230026,China; Collaborative Innovation Center of Advanced Microstructures,Nanjing 210093,China; CAS Center for Excellence in Superconducting Electronics(CENSE),Shanghai 200050,China%National Synchrotron Radiation Laboratory,University of Science and Technology of China,Hefei 230029,China; CAS Center for Excellence in Superconducting Electronics(CENSE),Shanghai 200050,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
• ISSN: 0256-307X; 1741-3540
• DOI: 10.1088/0256-307X/40/4/047301

Recently discovered kagome metals AV3Sb5(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 under-standing 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 kz=0 and kz=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.