| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Electronic Instability of Kagome Metal CsV$_{3}$Sb$_{5}$ in the $2 \times 2\times 2$ Charge Density Wave State |
| Hongen Zhu1†, Tongrui Li1†, Fanghang Yu2, Yuliang Li1, Sheng Wang1, Yunbo Wu1, Zhanfeng Liu1, Zhengming Shang1, Shengtao Cui1, Yi Liu1, Guobin Zhang1, Lidong Zhang1, Zhenyu Wang2,5, Tao Wu2,4,5, Jianjun Ying2, Xianhui Chen2,3,4,5, and Zhe Sun1,2,4* |
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
2Department of Physics, CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei 230026, China
3CAS Center for Excellence in Quantum Information and Quantum Physics, Hefei 230026, China
4Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
5CAS Center for Excellence in Superconducting Electronics (CENSE), Shanghai 200050, China
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| Cite this article: |
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Hongen Zhu, Tongrui Li, Fanghang Yu et al 2023 Chin. Phys. Lett. 40 047301 |
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Abstract Recently discovered kagome metals $A$V$_{3}$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 $\bar{M}$ 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 $\bar{M}$ 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 $k_{z}=\pi /c$ 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.
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Received: 20 January 2023
Editors' Suggestion
Published: 02 April 2023
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| PACS: |
73.20.-r
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(Electron states at surfaces and interfaces)
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75.25.Dk
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(Orbital, charge, and other orders, including coupling of these orders)
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74.20.Pq
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(Electronic structure calculations)
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74.25.Jb
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(Electronic structure (photoemission, etc.))
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