Signature of Topological Surface Bands in Altermagnetic Weyl Semimetal CrSb
As a special type of collinear antiferromagnetism (AFM), altermagnetism has garnered significant research interest recently. Altermagnets exhibit broken parity-time symmetry and zero net magnetization, leading to substantial band splitting in the momentum space. Meanwhile, parity-time symmetry breaking is a prerequisite for nontrivial band topology in Weyl physics. When there is band crossing, it is usually easy to generate Weyl nodes. Weyl semimetal states have been theoretically proposed in altermagnets; rare reports of experimental observation have been made up to this point. Using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations, we systematically studied the electronic structure of room-temperature altermagnet candidate CrSb. We clearly observed the band spin splitting and signature of topological surface states on the (100) cleaved side surface close to the Fermi level originating from bulk band topology. Our results imply that CrSb contains interesting nontrivial topological Weyl physics, in addition to being an excellent room temperature altermagnet.
Authors
- Junzhang Ma (ORCID: https://orcid.org/0000-0002-4648-3576)
- Quansheng Wu (ORCID: https://orcid.org/0000-0002-9154-4489)
- Kohei Yamagami (ORCID: https://orcid.org/0000-0001-6997-6157)
- Xin Liang (ORCID: https://orcid.org/0000-0002-5657-8704)
- Claudia Felser (ORCID: https://orcid.org/0000-0002-8200-2063)
- Dong Chen (ORCID: https://orcid.org/0000-0002-7170-9725)
- Siyuan Liu (ORCID: https://orcid.org/0000-0002-0946-4683)
- Junwei Liu (ORCID: https://orcid.org/0000-0001-8051-7349)
- Wanxiang Feng (ORCID: https://orcid.org/0000-0001-8488-1949)
- Yuzhi Wang (ORCID: https://orcid.org/0009-0000-8307-2293)
- Wenlong Lu
- Zihan Lin (ORCID: https://orcid.org/0000-0003-1791-8048)
- Shiyu Feng (ORCID: https://orcid.org/0009-0003-5698-3253)
Institutions
- Qingdao University (CN)
- Beijing Institute of Technology (CN)
- City University of Hong Kong (HK)
- Chinese Academy of Sciences (CN)
- Hong Kong University of Science and Technology (HK)
- Max Planck Institute for Chemical Physics of Solids (DE)
- Japan Synchrotron Radiation Research Institute (JP)
- FZU ‒ Institute of Physics of the Academy of Sciences of the Czech Republic (CZ)
- University of Chinese Academy of Sciences (CN)
Publication Details
- Journal
- Nano Letters
- Published
- 2025-04-28
- DOI
- https://doi.org/10.1021/acs.nanolett.5c00482
- Citations
- 28
- Primary Topic
- Topological Materials and Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 34.91
Funders
- Deutsche Forschungsgemeinschaft
- National Natural Science Foundation of China
- Research Grants Council, University Grants Committee
- European Research Council
- National Key Research and Development Program of China
- Basic and Applied Basic Research Foundation of Guangdong Province