Two-Dimensional Altermagnetism in Epitaxial CrSb Ultrathin Films
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arXiv
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| Main Authors: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914091460722688 |
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| author | Li, Keren Hu, Yuzhong Li, Yue Xu, Ruohang Li, Heping Liu, Kun Liu, Chen Zhuang, Jincheng Ang, Yee Sin Wang, Jiaou Feng, Haifeng Hao, Weichang Du, Yi |
| author_facet | Li, Keren Hu, Yuzhong Li, Yue Xu, Ruohang Li, Heping Liu, Kun Liu, Chen Zhuang, Jincheng Ang, Yee Sin Wang, Jiaou Feng, Haifeng Hao, Weichang Du, Yi |
| contents | Altermagnets constitute an emerging class of collinear magnets that exhibit zero net magnetization yet host spin-split electronic bands arising from non-relativistic spin-space-group symmetries. Realization of altermagnetism in the two-dimensional (2D) limit remains an outstanding challenge because dimensional reduction suppresses kZ dispersion and destabilizes the symmetry operations essential for spin compensation. Here, we demonstrate genuine 2D altermagnetism in epitaxial unit-cell-thin films of CrSb grown on Bi2Te3. It reveals a thickness-driven transition from a ferrimagnetic state in 1-unit-cell films to an altermagnetic state above a critical thickness of 7/4 unit cell. The transition originates from interfacial symmetry breaking at the Cr-terminated layer that induces local moment imbalance. With increasing thickness the key spin-space-group symmetries [C2||C6Zt] and [C2||MZ] restores, which leads to altermagnetism with zero net magnetization and momentum-dependent spin splitting. Our results provide the first experimental realization of altermagnetism in the 2D regime and establish a route for integrating stray-field-free spin order into nanoscale spintronic architectures. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_12344 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Two-Dimensional Altermagnetism in Epitaxial CrSb Ultrathin Films Li, Keren Hu, Yuzhong Li, Yue Xu, Ruohang Li, Heping Liu, Kun Liu, Chen Zhuang, Jincheng Ang, Yee Sin Wang, Jiaou Feng, Haifeng Hao, Weichang Du, Yi Materials Science Altermagnets constitute an emerging class of collinear magnets that exhibit zero net magnetization yet host spin-split electronic bands arising from non-relativistic spin-space-group symmetries. Realization of altermagnetism in the two-dimensional (2D) limit remains an outstanding challenge because dimensional reduction suppresses kZ dispersion and destabilizes the symmetry operations essential for spin compensation. Here, we demonstrate genuine 2D altermagnetism in epitaxial unit-cell-thin films of CrSb grown on Bi2Te3. It reveals a thickness-driven transition from a ferrimagnetic state in 1-unit-cell films to an altermagnetic state above a critical thickness of 7/4 unit cell. The transition originates from interfacial symmetry breaking at the Cr-terminated layer that induces local moment imbalance. With increasing thickness the key spin-space-group symmetries [C2||C6Zt] and [C2||MZ] restores, which leads to altermagnetism with zero net magnetization and momentum-dependent spin splitting. Our results provide the first experimental realization of altermagnetism in the 2D regime and establish a route for integrating stray-field-free spin order into nanoscale spintronic architectures. |
| title | Two-Dimensional Altermagnetism in Epitaxial CrSb Ultrathin Films |
| topic | Materials Science |
| url | https://arxiv.org/abs/2510.12344 |