Observation of hidden altermagnetism in Cs$_{1-\delta}$V$_2$Te$_2$O
Abstract
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 CsVTeO realizes a spatially modulated form of altermagnetism, i.e., hidden altermagnetism. Such a state in CsVTeO 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.
Keywords
Cite
@article{arxiv.2512.00972,
title = {Observation of hidden altermagnetism in Cs$_{1-\delta}$V$_2$Te$_2$O},
author = {Guowei Yang and Ruihan Chen and Changchao Liu and Jing Li and Ze Pan and Teng Hua and Pengyue Xiong and Liwei Deng and Naifu Zheng and Yu Tang and Hao Zheng and Weifan Zhu and Yifu Xu and Xinying Zheng and Xin Ma and Xiaoping Wang and Shengtao Cui and Zhe Sun and Zhengtai Liu and Mao Ye and Chao Cao and Ming Shi and Lunhui Hu and Qihang Liu and Shan Qiao and Guanghan Cao and Yu Song and Yang Liu},
journal= {arXiv preprint arXiv:2512.00972},
year = {2026}
}
Comments
The manuscript contains 8 pages and 3 figures