Van Hove singularity driven emergence of multiple flat band-like nondispersive features in kagome superconductors
The newly discovered kagome superconductors $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ ($A$ = K, Rb, and Cs) continue to bring surprises in generating unusual phenomena and physical properties, including the anomalous Hall effect, unconventional charge density wave, electronic nematicity, and time-reversal symmetry breaking. Here we report an unexpected emergence of multiple flat band-like nondispersive features in the $A{\mathrm{V}}_{3}{\mathrm{Sb}}_{5}$ superconductors. By performing high-resolution angle-resolved photoemission (ARPES) measurements, we observed four branches of nondispersive features that span over the entire momentum space. The appearance of the nondispersive features is not anticipated from the band structure calculations and cannot be accounted for by the known mechanisms of flat band generation. It is intimately related to the evolution of Van Hove singularities. Here we observe such emergence of multiple nondispersive features in solid materials. Our findings provide insights in revealing the underlying mechanism that governs the unusual behaviors in the kagome superconductors. They also provide a pathway in producing nondispersive features and set a platform to study flat band related physics.
Authors
- Kun Jiang (ORCID: https://orcid.org/0000-0003-3148-5058)
- Hongxiong Liu (ORCID: https://orcid.org/0000-0001-6769-6821)
- Bo Liang (ORCID: https://orcid.org/0000-0002-0604-0949)
- Hailan Luo (ORCID: https://orcid.org/0000-0002-9925-0450)
- Xingjiang Zhou (ORCID: https://orcid.org/0000-0002-5261-1386)
- Chengmin Shen (ORCID: https://orcid.org/0000-0003-4716-9367)
- Yiwen Chen (ORCID: https://orcid.org/0000-0002-4353-7014)
- Taimin Miao
- Haitao Yang (ORCID: https://orcid.org/0000-0003-4304-9835)
- Yuhao Gu (ORCID: https://orcid.org/0000-0001-7996-6198)
- Qingming Zhang (ORCID: https://orcid.org/0000-0002-3862-0518)
- Fengfeng Zhang (ORCID: https://orcid.org/0000-0001-5250-9421)
- Yingjie Shu
- Zhen Zhao (ORCID: https://orcid.org/0000-0002-0796-4078)
- Hao Chen (ORCID: https://orcid.org/0009-0001-6480-7976)
- Ziqiang Wang (ORCID: https://orcid.org/0000-0001-7617-2886)
- Guodong Liu (ORCID: https://orcid.org/0000-0002-0225-9732)
- Xiaolin Ren (ORCID: https://orcid.org/0000-0002-9353-9800)
- Youguo Shi
- Chaohui Yin
- Feng Yang (ORCID: https://orcid.org/0000-0001-8825-2218)
- Lin Zhao (ORCID: https://orcid.org/0000-0001-5284-2777)
- Zuyan Xu (ORCID: https://orcid.org/0000-0002-7426-3511)
- Yun-Peng Huang (ORCID: https://orcid.org/0000-0002-3274-0391)
- Hanqing Mao
- Shenjin Zhang (ORCID: https://orcid.org/0000-0002-3198-6971)
- Feng Jin
- Jiangping Hu
- Qinjun Peng
Institutions
- Boston College (US)
- Chinese Academy of Sciences (CN)
- Songshan Lake Materials Laboratory (CN)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- Technical Institute of Physics and Chemistry (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Physical review. B./Physical review. B
- Published
- 2025-04-14
- DOI
- https://doi.org/10.1103/physrevb.111.155123
- Citations
- 1
- Primary Topic
- Advanced Condensed Matter Physics
- Type
- article
- Field-Weighted Citation Impact
- 1.26
Funders
- U.S. Department of Energy
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Youth Innovation Promotion Association of the Chinese Academy of Sciences
- K. C. Wong Education Foundation
- National Key Research and Development Program of China
- Basic Energy Sciences