A Route to Nonrelativistic Altermagnetic Spin Splitting via Ultrafast Light
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arXiv
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| Autori principali: | , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915929277857792 |
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| author | Chen, Huang-Zhao-Xiang Yuan, Lin-Ding Liu, Wen-Hao Wang, Lin-Wang Luo, Jun-Wei Wang, Zhi |
| author_facet | Chen, Huang-Zhao-Xiang Yuan, Lin-Ding Liu, Wen-Hao Wang, Lin-Wang Luo, Jun-Wei Wang, Zhi |
| contents | We identify a nonequilibrium route for generating altermagnetic spin splitting in antiferromagnet by ultrafast light. Unlike existing strategies, this route does not require relativistic angular-momentum transfer, static symmetry breaking, or auxiliary external fields. Using real-time time-dependent density functional theory, we demonstrate in the antiferromagnetic perovskite KNiF3 that linearly polarized light can induce momentum-dependent altermagnetic spin splitting by breaking the effective time-reversal symmetry through photoexcited charge redistribution and the resulting lattice distortion. We provide a general symmetry selection rule for this route. These results establish a mechanism for ultrafast control of altermagnetism and extend its material realization into the nonequilibrium regime. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02790 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A Route to Nonrelativistic Altermagnetic Spin Splitting via Ultrafast Light Chen, Huang-Zhao-Xiang Yuan, Lin-Ding Liu, Wen-Hao Wang, Lin-Wang Luo, Jun-Wei Wang, Zhi Materials Science We identify a nonequilibrium route for generating altermagnetic spin splitting in antiferromagnet by ultrafast light. Unlike existing strategies, this route does not require relativistic angular-momentum transfer, static symmetry breaking, or auxiliary external fields. Using real-time time-dependent density functional theory, we demonstrate in the antiferromagnetic perovskite KNiF3 that linearly polarized light can induce momentum-dependent altermagnetic spin splitting by breaking the effective time-reversal symmetry through photoexcited charge redistribution and the resulting lattice distortion. We provide a general symmetry selection rule for this route. These results establish a mechanism for ultrafast control of altermagnetism and extend its material realization into the nonequilibrium regime. |
| title | A Route to Nonrelativistic Altermagnetic Spin Splitting via Ultrafast Light |
| topic | Materials Science |
| url | https://arxiv.org/abs/2604.02790 |