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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2605.24415 |
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| _version_ | 1866914594718482432 |
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| author | Liang, Bo Li, Xue Le, Congcong Wu, Zirui Zhu, Wenpei Cai, Neng Lau, Yong-Chang Wu, Xianxin Liu, Jiayu Liu, Zhanfeng Zhu, Hongen Li, Tongrui Jiang, Zhicheng Huang, Yu Jing, Wenchuan Ma, Xun Jiang, Qi Li, Hang Cai, Zhihao Chen, Xuezhi Qu, Gexing Cheng, Yiwei Chen, Bing-Jie Liu, Zhengtai Shen, Dawei Ye, Mao Cui, Shengtao Sun, Zhe Miyamoto, Koji Okuda, Taichi Shimada, Kenya Huang, Yaobo Chen, Zhenhua Zhao, Lin Feng, Baojie Ren, Xinguo Wang, Wenhong Zhou, Xingjiang Liu, Guodong |
| author_facet | Liang, Bo Li, Xue Le, Congcong Wu, Zirui Zhu, Wenpei Cai, Neng Lau, Yong-Chang Wu, Xianxin Liu, Jiayu Liu, Zhanfeng Zhu, Hongen Li, Tongrui Jiang, Zhicheng Huang, Yu Jing, Wenchuan Ma, Xun Jiang, Qi Li, Hang Cai, Zhihao Chen, Xuezhi Qu, Gexing Cheng, Yiwei Chen, Bing-Jie Liu, Zhengtai Shen, Dawei Ye, Mao Cui, Shengtao Sun, Zhe Miyamoto, Koji Okuda, Taichi Shimada, Kenya Huang, Yaobo Chen, Zhenhua Zhao, Lin Feng, Baojie Ren, Xinguo Wang, Wenhong Zhou, Xingjiang Liu, Guodong |
| contents | Chiral helimagnets based on intercalated transition-metal dichalcogenides, characterized by nano-scale spin ordering, provide a powerful route to engineer chiral spin textures (e.g. the topologically protected magnetic solitons) and emergent electronic functionality at reduced dimensions, where surface and interface states often dominate device operation. However, despite growing interest, direct experimental studies of termination-dependent surface electronic structures and their temperature-driven magnetic evolution remain largely unexplored, hindering a microscopic understanding of the electronic states that is crucial for the development of low-dimensional spintronic devices. Here, for the first time, taking Cr1/3TaS2 as a representative example, we systematically investigate the termination-dependent surface electronic states of the chiral helimagnets and uncover their distinct temperature evolution across the magnetic transition (TC~142K) by combining high-resolution ARPES with a micro-focused beam and surface-state-resolved first-principles calculations. The TaS2-terminated surface hosts folded monolayer-like TaS2 bands under the $\sqrt3\times\sqrt3$ superlattice potential and a shallow triangular electron pocket at the superlattice $\bar K$ point arising from Cr-Ta orbital hybridization. In contrast, the Cr-terminated surface exhibits reconstructed hole pockets with pronounced magnetic band splitting. This splitting disappears above TC and closely follows the chiral helimagnetic order parameter, providing a direct spectroscopic fingerprint of chiral helimagnetic order. In addition, multiple ultranarrow Cr-d-derived surface flat bands are resolved. These findings establish Cr1/3TaS2 as a model system in which surface electronic states are strongly coupled to chiral magnetism, opening new opportunities for chiral spintronic and valleytronic micro/nanodevices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2605_24415 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Termination-Dependent Surface States and Magnetic Fingerprints of Chiral Helimagnet Cr1/3TaS2 Liang, Bo Li, Xue Le, Congcong Wu, Zirui Zhu, Wenpei Cai, Neng Lau, Yong-Chang Wu, Xianxin Liu, Jiayu Liu, Zhanfeng Zhu, Hongen Li, Tongrui Jiang, Zhicheng Huang, Yu Jing, Wenchuan Ma, Xun Jiang, Qi Li, Hang Cai, Zhihao Chen, Xuezhi Qu, Gexing Cheng, Yiwei Chen, Bing-Jie Liu, Zhengtai Shen, Dawei Ye, Mao Cui, Shengtao Sun, Zhe Miyamoto, Koji Okuda, Taichi Shimada, Kenya Huang, Yaobo Chen, Zhenhua Zhao, Lin Feng, Baojie Ren, Xinguo Wang, Wenhong Zhou, Xingjiang Liu, Guodong Materials Science Mesoscale and Nanoscale Physics Chiral helimagnets based on intercalated transition-metal dichalcogenides, characterized by nano-scale spin ordering, provide a powerful route to engineer chiral spin textures (e.g. the topologically protected magnetic solitons) and emergent electronic functionality at reduced dimensions, where surface and interface states often dominate device operation. However, despite growing interest, direct experimental studies of termination-dependent surface electronic structures and their temperature-driven magnetic evolution remain largely unexplored, hindering a microscopic understanding of the electronic states that is crucial for the development of low-dimensional spintronic devices. Here, for the first time, taking Cr1/3TaS2 as a representative example, we systematically investigate the termination-dependent surface electronic states of the chiral helimagnets and uncover their distinct temperature evolution across the magnetic transition (TC~142K) by combining high-resolution ARPES with a micro-focused beam and surface-state-resolved first-principles calculations. The TaS2-terminated surface hosts folded monolayer-like TaS2 bands under the $\sqrt3\times\sqrt3$ superlattice potential and a shallow triangular electron pocket at the superlattice $\bar K$ point arising from Cr-Ta orbital hybridization. In contrast, the Cr-terminated surface exhibits reconstructed hole pockets with pronounced magnetic band splitting. This splitting disappears above TC and closely follows the chiral helimagnetic order parameter, providing a direct spectroscopic fingerprint of chiral helimagnetic order. In addition, multiple ultranarrow Cr-d-derived surface flat bands are resolved. These findings establish Cr1/3TaS2 as a model system in which surface electronic states are strongly coupled to chiral magnetism, opening new opportunities for chiral spintronic and valleytronic micro/nanodevices. |
| title | Termination-Dependent Surface States and Magnetic Fingerprints of Chiral Helimagnet Cr1/3TaS2 |
| topic | Materials Science Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2605.24415 |