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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2508.15944 |
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| _version_ | 1866914000603709440 |
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| author | González, J. W. Gallardo, R. A. Vidal-Silva, N. León, A. M. |
| author_facet | González, J. W. Gallardo, R. A. Vidal-Silva, N. León, A. M. |
| contents | Altermagnets have emerged as a fertile ground for quantum phenomena, but topological phases unifying different quasiparticles remain largely unexplored. Here, we demonstrate that monolayer AgF$_2$ hosts a dual topological state, driven by a single ferroelastic distortion. This polar transition breaks inversion symmetry and unleashes relativistic spin-orbit effects, simultaneously imparting non-trivial topology to electrons and magnons. The result is valence bands with opposite Chern numbers, $C^E=\pm3$, and a magnon spectrum with a full topological gap and chiral bands, $C^M=\pm1$. This work realizes topological altermagnonics in a tangible material platform, with a clear experimental fingerprint in the transverse thermal Hall effect. The coexistence of fermionic and bosonic topology in AgF$_2$ opens new directions for designing intrinsically hybrid quantum matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_15944 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Dual Topology as a Fingerprint of Relativistic Altermagnetism in AgF$_2$ Monolayer González, J. W. Gallardo, R. A. Vidal-Silva, N. León, A. M. Mesoscale and Nanoscale Physics Materials Science Altermagnets have emerged as a fertile ground for quantum phenomena, but topological phases unifying different quasiparticles remain largely unexplored. Here, we demonstrate that monolayer AgF$_2$ hosts a dual topological state, driven by a single ferroelastic distortion. This polar transition breaks inversion symmetry and unleashes relativistic spin-orbit effects, simultaneously imparting non-trivial topology to electrons and magnons. The result is valence bands with opposite Chern numbers, $C^E=\pm3$, and a magnon spectrum with a full topological gap and chiral bands, $C^M=\pm1$. This work realizes topological altermagnonics in a tangible material platform, with a clear experimental fingerprint in the transverse thermal Hall effect. The coexistence of fermionic and bosonic topology in AgF$_2$ opens new directions for designing intrinsically hybrid quantum matter. |
| title | Dual Topology as a Fingerprint of Relativistic Altermagnetism in AgF$_2$ Monolayer |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2508.15944 |