Nontrivial Fermi surface topology in kagome superconductor CsTi<sub>3</sub>Bi<sub>5</sub> revealed by de Haas–van Alphen oscillation
Abstract The kagome lattice, naturally encompassing Dirac fermions, flat bands, and van Hove singularities, tends to intertwine exotic electronic states. Revealing the characteristics of its Fermi surface will help clarify the nature of the complex quantum phenomena in kagome material. Here we report the Fermi surface properties of the novel kagome metal CsTi 3 Bi 5 by the de Haas–van Alphen oscillations. The observed oscillations are clear and consist of six principal frequencies ranging from 214 T to 1013 T. The angular dependence of the frequency implies a quasi-two-dimensional electronic structure. In addition, the geometry phase corresponding to 281 T, determined by direct Lifshitz–Kosevich formula fitting, yields a value close to π , which may indicate a band structure with nontrivial topological property. These results underscore the potential of CsTi 3 Bi 5 as a promising platform to explore the interplay between topological order, electronic nematicity, and superconductivity.
Authors
- Xiaoli Dong (ORCID: https://orcid.org/0000-0002-6268-2049)
- Gang Su (ORCID: https://orcid.org/0000-0002-8149-4342)
- Haitao Yang (ORCID: https://orcid.org/0000-0003-4304-9835)
- Jinguang Cheng (ORCID: https://orcid.org/0000-0002-4969-1960)
- Zouyouwei Lu (ORCID: https://orcid.org/0000-0002-1271-7354)
- Jihu Lu
- Aini Xu (ORCID: https://orcid.org/0009-0007-5833-8505)
- Xin-Wei Yi (ORCID: https://orcid.org/0000-0002-6930-2387)
- Shiliang Li (ORCID: https://orcid.org/0000-0001-7922-3730)
- Yue Liu (ORCID: https://orcid.org/0000-0002-0092-7485)
- Yuhang Zhang (ORCID: https://orcid.org/0000-0001-5382-6496)
- Hui Chen (ORCID: https://orcid.org/0000-0002-3369-8113)
- Ziyi Liu (ORCID: https://orcid.org/0000-0002-5561-3889)
- Hua Zhang (ORCID: https://orcid.org/0000-0001-9518-740X)
- Jiali Liu (ORCID: https://orcid.org/0000-0002-4976-4277)
- Zhen Zhao (ORCID: https://orcid.org/0000-0003-0044-5512)
- Li Dong (ORCID: https://orcid.org/0000-0002-8474-4466)
- Zhongxian Zhao
- Hongjun Gao (ORCID: https://orcid.org/0000-0003-3815-0517)
Institutions
- Chinese Academy of Sciences (CN)
- Kavli Institute for Theoretical Sciences (CN)
- Songshan Lake Materials Laboratory (CN)
- Institute of Theoretical Physics (CN)
- RIKEN Center for Emergent Matter Science (JP)
- Institute of Physics (CN)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Chinese Physics B
- Published
- 2025-04-02
- DOI
- https://doi.org/10.1088/1674-1056/adc7f0
- Citations
- 1
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 1.25