Infrared spectroscopy study of the kagome material CsTi3Bi5

doi:10.1103/PhysRevB.111.075147

	Infrared spectroscopy study of the kagome material CsTi3Bi5
	Cao, Liye 1,2; Liu, Xiangqi3 ; Cheng, Jiayi 1,2; Gao, Bixia 1,2; Zhang, Xiaoting 1,2; Guo, Yanfeng3,4 ; Ma, Fengjie 1,2; Chen, Rongyan 1,2
	2025-02-15
发表期刊	PHYSICAL REVIEW B (IF:3.2[JCR-2023],3.3[5-Year])
ISSN	2469-9950
EISSN	2469-9969
卷号	111 期号:7
发表状态	已发表
DOI	10.1103/PhysRevB.111.075147
摘要	The kagome material CsTi3Bi5, which is isostructural to the extensively studied charge-density-wave (CDW) compound CsV3Sb5, exhibits intriguing electronic features within its two-dimensional kagome lattices of titanium atoms. Here, we perform optical spectroscopic measurements together with the first-principles calculations for single-crystalline CsTi3Bi5 to investigate its electronic properties comprehensively. It is found that the overall optical spectra exhibit surprising similarity to those of CsV3Sb5, even in the CDW state. Nevertheless, the existence of CDW instability is ruled out in CsTi3Bi5. Via careful comparison to the optical responses of CsV3Sb5, we attribute this difference to a significant reduction in the itinerant carrier density of CsTi3Bi5, which is associated with the absence of Van Hove singularity near the Fermi level at the M point. These results support the scenario that the CDW in CsV3Sb5 is driven by the nesting of Van Hove singularity. Additionally, we unveil some exotic low-lying absorption features which provide clear evidence of flat bands in CsTi3Bi5. Our findings contribute to a deeper understanding of exotic phenomena in CsTi3Bi5 and provide valuable insights into the role of Van Hove singularity in CsV3Sb5. © 2025 American Physical Society.
关键词	Antimony compounds - Bismuth alloys - Cadmium compounds - Cesium compounds - Crystalline materials - Spectroscopic analysis - Titanium compounds - Vanadium compounds Charge-density-waves - Infrared: spectroscopy - Isostructural - Kagome lattice - Kagome materials - Optical spectroscopic - Spectroscopic measurements - Titanium atoms - Two-dimensional - Van Hove singularities
URL	查看原文
收录类别	EI ; SCI
语种	英语
资助项目	National Key Projects for Research and Development of China[2021YFA1400400] ; National Natural Science Foundation of China["12074042","12074040"] ; Young Scientists Fund of the National Natural Science Foundation of China[11704033] ; Fundamental Research Funds for the Central Universities[2243300003] ; National Key R&D Program of China[2023YFA1406100]
WOS研究方向	Materials Science ; Physics
WOS类目	Materials Science, Multidisciplinary ; Physics, Applied ; Physics, Condensed Matter
WOS记录号	WOS:001448643100009
出版者	American Physical Society
EI入藏号	20250817933696
EI主题词	Charge density waves
EI分类号	1301.1.3.1 Spectroscopy - 1301.4.1 Crystalline Solids and Crystallography - 202.2.3 Titanium and Alloys - 202.3.6 Vanadium and Alloys - 202.6.4 Antimony and Alloys - 202.9.3 Others, including Bismuth, Boron, Cadmium, Cobalt, Mercury, Niobium, Selenium, Silicon, Tellurium and Zirconium - 214 Materials Science - 804.2 Inorganic Compounds
原始文献类型	Journal article (JA)
文献类型	期刊论文
条目标识符	https://kms.shanghaitech.edu.cn/handle/2MSLDSTB/497011
专题	物质科学与技术学院物质科学与技术学院_PI研究组_郭艳峰组物质科学与技术学院_博士生
通讯作者	Ma, Fengjie; Chen, Rongyan
作者单位	1.Center for Advanced Quantum Studies, School of Physics and Astronomy, Beijing Normal University, Beijing; 100875, China; 2.Key Laboratory of Multiscale Spin Physics (Ministry of Education), Beijing Normal University, Beijing; 100875, China; 3.School of Physical Science and Technology, ShanghaiTech University, Shanghai; 201210, China; 4.ShanghaiTech Laboratory for Topological Physics, Shanghai; 201210, China
推荐引用方式 GB/T 7714	Cao, Liye,Liu, Xiangqi,Cheng, Jiayi,et al. Infrared spectroscopy study of the kagome material CsTi3Bi5[J]. PHYSICAL REVIEW B,2025,111(7).
APA	Cao, Liye.,Liu, Xiangqi.,Cheng, Jiayi.,Gao, Bixia.,Zhang, Xiaoting.,...&Chen, Rongyan.(2025).Infrared spectroscopy study of the kagome material CsTi3Bi5.PHYSICAL REVIEW B,111(7).
MLA	Cao, Liye,et al."Infrared spectroscopy study of the kagome material CsTi3Bi5".PHYSICAL REVIEW B 111.7(2025).