Topological magnons in a collinear altermagnet
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arXiv
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| Format: | Preprint |
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2024
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| _version_ | 1866913699272327168 |
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| author | Zhang, Meng-Han Xiao, Lu Yao, Dao-Xin |
| author_facet | Zhang, Meng-Han Xiao, Lu Yao, Dao-Xin |
| contents | We propose a model with Weyl magnons and nodal-line magnons ($\mathbb{Z}_2$) in a collinear altermagnet on the honeycomb lattice. Altermagnetic magnon bands can be realized by breaking the symmetry of the second nearest neighbor exchange couplings without the Dzyaloshinskii-Moriya interaction (DMI). In addition to the Chern number and $\mathbb{Z}_2$ invariant, chirality is important to describe the magnon topology. The model shows the nonzero magnon spin Nernst effect when a longitudinal temperature gradient exists. We calculate the differential gyromagnetic ratio induced purely by the topology of altermagnetic magnons, which can be probed through the Einstein-de Haas (EdH) effect. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2407_18379 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological magnons in a collinear altermagnet Zhang, Meng-Han Xiao, Lu Yao, Dao-Xin Mesoscale and Nanoscale Physics Strongly Correlated Electrons We propose a model with Weyl magnons and nodal-line magnons ($\mathbb{Z}_2$) in a collinear altermagnet on the honeycomb lattice. Altermagnetic magnon bands can be realized by breaking the symmetry of the second nearest neighbor exchange couplings without the Dzyaloshinskii-Moriya interaction (DMI). In addition to the Chern number and $\mathbb{Z}_2$ invariant, chirality is important to describe the magnon topology. The model shows the nonzero magnon spin Nernst effect when a longitudinal temperature gradient exists. We calculate the differential gyromagnetic ratio induced purely by the topology of altermagnetic magnons, which can be probed through the Einstein-de Haas (EdH) effect. |
| title | Topological magnons in a collinear altermagnet |
| topic | Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2407.18379 |