학술논문
Tunable Van Hove Singularity without Structural Instability in Kagome Metal CsTi3Bi5
Document Type
article
Author
Liu, Bo; Kuang, Min-Quan; Luo, Yang; Li, Yongkai; Hu, Cheng; Liu, Jiarui; Xiao, Qian; Zheng, Xiquan; Huai, Linwei; Peng, Shuting; Wei, Zhiyuan; Shen, Jianchang; Wang, Bingqian; Miao, Yu; Sun, Xiupeng; Ou, Zhipeng; Cui, Shengtao; Sun, Zhe; Hashimoto, Makoto; Lu, Donghui; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Moreschini, Luca; Lanzara, Alessandra; Wang, Yao; Peng, Yingying; Yao, Yugui; Wang, Zhiwei; He, Junfeng
Source
Physical Review Letters. 131(2)
Subject
Language
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.