Visualizing spin-polarization of an altermagnet KV$_2$Se$_2$O via spin-selective tunneling
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866912978753814528 |
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| author | Yang, Guofei Li, Chuang Wang, Chengwei Zhao, Xudong Wan, Yifan Gui, Hengrui Zeng, Guoqing Cao, Saizheng Hu, Chuqiao Chen, Dong Liu, Yu Song, Yu Liu, Fei Hu, Lun-Hui Jiao, Lin Yuan, Huiqiu |
| author_facet | Yang, Guofei Li, Chuang Wang, Chengwei Zhao, Xudong Wan, Yifan Gui, Hengrui Zeng, Guoqing Cao, Saizheng Hu, Chuqiao Chen, Dong Liu, Yu Song, Yu Liu, Fei Hu, Lun-Hui Jiao, Lin Yuan, Huiqiu |
| contents | Altermagnetism, a recently identified magnetic phase that combines vanishing net magnetization with momentum-dependent spin splitting, challenges the conventional dichotomy between ferromagnets and antiferromagnets. While several candidate materials have been proposed, direct experimental evidence linking crystal symmetry, electronic structure and d-wave spin polarization remains scarce. Here we report the visualization of a metallic d-wave altermagnet in KV2Se2O. Through spin-selective scanning tunneling microscopy powered by a topological insulator tip, we uncover symmetry-protected momentum-dependent spin splitting that follows a characteristic d-wave form factor. Our results establish KV2Se2O as a tunable platform to study the interplay between spin-valley locking, Fermi-surface instability and unconventional magnetism, and open a pathway toward symmetry-engineered spintronics without net magnetization. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_21969 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Visualizing spin-polarization of an altermagnet KV$_2$Se$_2$O via spin-selective tunneling Yang, Guofei Li, Chuang Wang, Chengwei Zhao, Xudong Wan, Yifan Gui, Hengrui Zeng, Guoqing Cao, Saizheng Hu, Chuqiao Chen, Dong Liu, Yu Song, Yu Liu, Fei Hu, Lun-Hui Jiao, Lin Yuan, Huiqiu Materials Science Altermagnetism, a recently identified magnetic phase that combines vanishing net magnetization with momentum-dependent spin splitting, challenges the conventional dichotomy between ferromagnets and antiferromagnets. While several candidate materials have been proposed, direct experimental evidence linking crystal symmetry, electronic structure and d-wave spin polarization remains scarce. Here we report the visualization of a metallic d-wave altermagnet in KV2Se2O. Through spin-selective scanning tunneling microscopy powered by a topological insulator tip, we uncover symmetry-protected momentum-dependent spin splitting that follows a characteristic d-wave form factor. Our results establish KV2Se2O as a tunable platform to study the interplay between spin-valley locking, Fermi-surface instability and unconventional magnetism, and open a pathway toward symmetry-engineered spintronics without net magnetization. |
| title | Visualizing spin-polarization of an altermagnet KV$_2$Se$_2$O via spin-selective tunneling |
| topic | Materials Science |
| url | https://arxiv.org/abs/2603.21969 |