1. Tunable van Hove singularity without structural instability in Kagome metal CsTi$_3$Bi$_5$
- Author
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Liu, Bo, Kuang, Minquan, Luo, Yang, Li, Yongkai, Huai, Linwei, Peng, Shuting, Wei, Zhiyuan, Shen, Jianchang, Wang, Bingqian, Miao, Yu, Sun, Xiupeng, Ou, Zhipeng, Yao, Yugui, Wang, Zhiwei, and He, Junfeng
- Subjects
Condensed Matter - Strongly Correlated Electrons ,Condensed Matter - Materials Science ,Strongly Correlated Electrons (cond-mat.str-el) ,Materials Science (cond-mat.mtrl-sci) ,FOS: Physical sciences - Abstract
In Kagome metal CsV$_3$Sb$_5$, multiple intertwined orders are accompanied by both electronic and structural instabilities. These exotic orders have attracted much recent attention, but their origins remain elusive. The newly discovered CsTi$_3$Bi$_5$ is a Ti-based Kagome metal to parallel CsV$_3$Sb$_5$. Here, we report angle-resolved photoemission experiments and first-principles calculations on pristine and Cs-doped CsTi$_3$Bi$_5$ samples. Our results reveal that the van Hove singularity (vHS) in CsTi$_3$Bi$_5$ can be tuned in a large energy range without structural instability, different from that in CsV$_3$Sb$_5$. As such, CsTi$_3$Bi$_5$ provides a complementary platform to disentangle and investigate the electronic instability with a tunable vHS in Kagome metals.
- Published
- 2022
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