在 Kagome 金属 CsTi₃Bi₅ 中无结构不稳定性的可调范霍夫奇点
Tunable Van Hove Singularity without Structural Instability in Kagome Metal CsTi_{3}Bi_{5}.
作者信息
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
机构信息
Department of Physics and CAS Key Laboratory of Strongly-coupled Quantum Matter Physics, University of Science and Technology of China, Hefei, Anhui 230026, China.
Chongqing Key Laboratory of Micro & Nano Structure Optoelectronics, and School of Physical Science and Technology, Southwest University, Chongqing 400715, China.
出版信息
Phys Rev Lett. 2023 Jul 14;131(2):026701. doi: 10.1103/PhysRevLett.131.026701.
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.
在 Kagome 金属 CsV₃Sb₅ 中，多种相互交织的有序态伴随着电子和结构不稳定性。这些奇异的有序态最近引起了广泛关注，但其起源仍然难以捉摸。新发现的 CsTi₃Bi₅ 是一种与 CsV₃Sb₅ 类似的基于 Ti 的 Kagome 金属。在此，我们报告了对原始和 Cs 掺杂的 CsTi₃Bi₅ 样品的角分辨光电子能谱实验和第一性原理计算。我们的结果表明，与 CsV₃Sb₅ 不同，CsTi₃Bi₅ 中的范霍夫奇点（vHS）可以在较大的能量范围内被调节而不发生结构不稳定。因此，CsTi₃Bi₅ 提供了一个互补的平台，用于在 Kagome 金属中解开并研究具有可调 vHS 的电子不稳定性。
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