Quantization of spin circular photogalvanic effect in altermagnetic Weyl semimetals
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arXiv
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| Autores principales: | , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866915953610063872 |
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| author | Yoshida, Hiroki Priessnitz, Jan Šmejkal, Libor Murakami, Shuichi |
| author_facet | Yoshida, Hiroki Priessnitz, Jan Šmejkal, Libor Murakami, Shuichi |
| contents | We theoretically predict a spin-current analog of the quantized circular photogalvanic effect in Weyl semimetals. This phenomenon is forbidden in antiferromagnets by symmetry but uniquely allowed in altermagnets, highlighting a novel and intrinsic characteristic of altermagnetism. To systematically explore second-order spin current responses, we classify all symmetry-allowed responses based on spin point groups. Furthermore, we provide a comprehensive classification of altermagnetic Weyl semimetals by identifying spin space groups that host symmetry-enforced Weyl points. Utilizing this classification, we construct a symmetry-guided tight-binding model and confirm our predictions. Finally, we identify Weyl crossings in a material candidate via first-principle calculations. Our work unveils a distinctive optical response of altermagnets, paving the way for a new frontier in altermagnetism. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_05620 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Quantization of spin circular photogalvanic effect in altermagnetic Weyl semimetals Yoshida, Hiroki Priessnitz, Jan Šmejkal, Libor Murakami, Shuichi Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter We theoretically predict a spin-current analog of the quantized circular photogalvanic effect in Weyl semimetals. This phenomenon is forbidden in antiferromagnets by symmetry but uniquely allowed in altermagnets, highlighting a novel and intrinsic characteristic of altermagnetism. To systematically explore second-order spin current responses, we classify all symmetry-allowed responses based on spin point groups. Furthermore, we provide a comprehensive classification of altermagnetic Weyl semimetals by identifying spin space groups that host symmetry-enforced Weyl points. Utilizing this classification, we construct a symmetry-guided tight-binding model and confirm our predictions. Finally, we identify Weyl crossings in a material candidate via first-principle calculations. Our work unveils a distinctive optical response of altermagnets, paving the way for a new frontier in altermagnetism. |
| title | Quantization of spin circular photogalvanic effect in altermagnetic Weyl semimetals |
| topic | Mesoscale and Nanoscale Physics Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2509.05620 |