Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMn$_2$Ge$_2$
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arXiv
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| Auteurs principaux: | , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912589348339712 |
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| author | Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit |
| author_facet | Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit |
| contents | Metallic antiferromagnets are essential for efficient spintronic applications due to their fast switching and high mobility, yet room-temperature metallic antiferromagnets are rare. Here, we investigate YbMn$_2$Ge$_2$, a room temperature antiferromagnet, and establish it as an exfoliable layered metal with altermagnetic surface states. Using multi-orbital Hubbard model calculations, we reveal that its robust metallic AFM ordering is stabilized by electronic correlations and a partially nested Fermi surface. Furthermore, we show that YbMn$_2$Ge$_2$ hosts symmetry-protected topological Dirac crossings, connecting unique even-order spin-polarized surface states with parabolic and inverted Mexican-hat-like dispersion. Our findings position YbMn$_2$Ge$_2$ as a promising platform for exploring the interplay of correlation, topology, and surface altermagnetism of layered antiferromagnets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_07206 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMn$_2$Ge$_2$ Jana, Nirmalya Chakraborty, Atasi Mukherjee, Anamitra Agarwal, Amit Materials Science Mesoscale and Nanoscale Physics Applied Physics Metallic antiferromagnets are essential for efficient spintronic applications due to their fast switching and high mobility, yet room-temperature metallic antiferromagnets are rare. Here, we investigate YbMn$_2$Ge$_2$, a room temperature antiferromagnet, and establish it as an exfoliable layered metal with altermagnetic surface states. Using multi-orbital Hubbard model calculations, we reveal that its robust metallic AFM ordering is stabilized by electronic correlations and a partially nested Fermi surface. Furthermore, we show that YbMn$_2$Ge$_2$ hosts symmetry-protected topological Dirac crossings, connecting unique even-order spin-polarized surface states with parabolic and inverted Mexican-hat-like dispersion. Our findings position YbMn$_2$Ge$_2$ as a promising platform for exploring the interplay of correlation, topology, and surface altermagnetism of layered antiferromagnets. |
| title | Layered Topological Antiferromagnetic Metal at Room Temperature -- YbMn$_2$Ge$_2$ |
| topic | Materials Science Mesoscale and Nanoscale Physics Applied Physics |
| url | https://arxiv.org/abs/2503.07206 |