Electronic states dressed by an out-of-plane supermodulation in the quasi-two-dimensional kagome superconductor CsV3Sb5

• Published in: Physical review. B 2022-06, Vol.105 (24)
• Main Authors: Luo, Yang, Peng, Shuting, Teicher, Samuel L., Huai, Linwei, Hu, Yong, Han, Yulei, Ortiz, Brenden R., Liang, Zuowei, Wei, Zhiyuan, Shen, Jianchang, Ou, Zhipeng, Wang, Bingqian, Miao, Yu, Guo, Mingyao, Hashimoto, Makoto, Lu, Donghui, Qiao, Zhenhua, Wang, Zhenyu, Wilson, Stephen D., Chen, Xianhui, He, Junfeng
• Format: Article
• Language: English
• Subjects: Angle-resolved photoemission spectroscopy; CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; First-principles calculations; Kagome lattice; Single crystal materials; Topological phases of matter
• ISSN: 2469-9950; 2469-9969
• DOI: 10.1103/PhysRevB.105.L241111

CsV3Sb5 has attracted much recent attention as the first quasi-two-dimensional (2D) kagome superconductor. While the kagome layers are 2D in nature, increasing evidence has pointed to the importance of out-of-plane correlation in this material. However, it remains unclear whether such correlation can change the fundamental electronic structure of the quasi-2D system. Here, we reveal this missing piece of information, using angle-resolved photoemission spectroscopy, complemented by scanning tunneling microscope measurements. The three-dimensional electronic structures in the high-temperature state are revealed, which agree well with density-functional theory calculations. Electron energy bands are observed in the low-temperature state that exhibit additional periodicities along the out-of-plane momentum. Furthermore, these results reveal a direct response to the out-of-plane electronic supermodulation in the single-particle spectral function of CsV3Sb5, thus establishing an electronic platform to examine emergent phenomena beyond 2D limit in kagome superconductors.