Observation of hidden altermagnetism in Cs$_{1-δ}$V$_2$Te$_2$O
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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_ | 1866914556184363008 |
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| author | Yang, Guowei Chen, Ruihan Liu, Changchao Li, Jing Pan, Ze Hua, Teng Xiong, Pengyue Deng, Liwei Zheng, Naifu Tang, Yu Zheng, Hao Zhu, Weifan Xu, Yifu Zheng, Xinying Ma, Xin Wang, Xiaoping Cui, Shengtao Sun, Zhe Liu, Zhengtai Ye, Mao Cao, Chao Shi, Ming Hu, Lunhui Liu, Qihang Qiao, Shan Cao, Guanghan Song, Yu Liu, Yang |
| author_facet | Yang, Guowei Chen, Ruihan Liu, Changchao Li, Jing Pan, Ze Hua, Teng Xiong, Pengyue Deng, Liwei Zheng, Naifu Tang, Yu Zheng, Hao Zhu, Weifan Xu, Yifu Zheng, Xinying Ma, Xin Wang, Xiaoping Cui, Shengtao Sun, Zhe Liu, Zhengtai Ye, Mao Cao, Chao Shi, Ming Hu, Lunhui Liu, Qihang Qiao, Shan Cao, Guanghan Song, Yu Liu, Yang |
| contents | Altermagnets are characterized by anisotropic band/spin splittings in momentum space, dictated by their spin-space group symmetries. However, the real-space modulations of altermagnetism are often neglected and have not been explored experimentally. Here we combine neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES and density functional theory to demonstrate that Cs$_{1-δ}$V$_2$Te$_2$O realizes a spatially modulated form of altermagnetism, i.e., hidden altermagnetism. Such a state in Cs$_{1-δ}$V$_2$Te$_2$O results from its G-type antiferromagnetism and two-dimensional electronic states, allowing for the development of spatially alternating altermagnetic layers, whose local spin polarizations are directly verified by spin-resolved ARPES measurements. Our experimental discovery of hidden altermagnetism broadens the scope of unconventional magnetism and opens routes to exploring emergent phenomena from real-space modulations of altermagnetic order. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_00972 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of hidden altermagnetism in Cs$_{1-δ}$V$_2$Te$_2$O Yang, Guowei Chen, Ruihan Liu, Changchao Li, Jing Pan, Ze Hua, Teng Xiong, Pengyue Deng, Liwei Zheng, Naifu Tang, Yu Zheng, Hao Zhu, Weifan Xu, Yifu Zheng, Xinying Ma, Xin Wang, Xiaoping Cui, Shengtao Sun, Zhe Liu, Zhengtai Ye, Mao Cao, Chao Shi, Ming Hu, Lunhui Liu, Qihang Qiao, Shan Cao, Guanghan Song, Yu Liu, Yang Materials Science Strongly Correlated Electrons Altermagnets are characterized by anisotropic band/spin splittings in momentum space, dictated by their spin-space group symmetries. However, the real-space modulations of altermagnetism are often neglected and have not been explored experimentally. Here we combine neutron diffraction, angle-resolved photoemission spectroscopy (ARPES), spin-resolved ARPES and density functional theory to demonstrate that Cs$_{1-δ}$V$_2$Te$_2$O realizes a spatially modulated form of altermagnetism, i.e., hidden altermagnetism. Such a state in Cs$_{1-δ}$V$_2$Te$_2$O results from its G-type antiferromagnetism and two-dimensional electronic states, allowing for the development of spatially alternating altermagnetic layers, whose local spin polarizations are directly verified by spin-resolved ARPES measurements. Our experimental discovery of hidden altermagnetism broadens the scope of unconventional magnetism and opens routes to exploring emergent phenomena from real-space modulations of altermagnetic order. |
| title | Observation of hidden altermagnetism in Cs$_{1-δ}$V$_2$Te$_2$O |
| topic | Materials Science Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2512.00972 |