Topological Magnons on the Ferromagnetic Zigzag Lattice
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866929607494598656 |
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| author | Subramanian, Skandan Berlijn, Tom Lindsay, Lucas Fishman, Randy S. Villanova, John W. |
| author_facet | Subramanian, Skandan Berlijn, Tom Lindsay, Lucas Fishman, Randy S. Villanova, John W. |
| contents | Motivated by the experimental identification of magnetic compounds consisting of zigzag chains, we analyze the band structure topology of magnons in ferromagnets on a zigzag lattice. We account for the general lattice geometry by including spatially anisotropic Heisenberg exchange interactions and by Dzyaloshinskii-Moriya interaction on inversion asymmetric bonds. Within the linear spin-wave theory, we find two magnon branches, whose band structure topology (i.e., Chern numbers) we map out in a comprehensive phase diagram. Notably, besides topologically trivial and gapless phases, we identify topologically nontrivial phases that support chiral edge magnons. We show that these edge states are robust against elastic defect scattering. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_18515 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Topological Magnons on the Ferromagnetic Zigzag Lattice Subramanian, Skandan Berlijn, Tom Lindsay, Lucas Fishman, Randy S. Villanova, John W. Mesoscale and Nanoscale Physics Materials Science Motivated by the experimental identification of magnetic compounds consisting of zigzag chains, we analyze the band structure topology of magnons in ferromagnets on a zigzag lattice. We account for the general lattice geometry by including spatially anisotropic Heisenberg exchange interactions and by Dzyaloshinskii-Moriya interaction on inversion asymmetric bonds. Within the linear spin-wave theory, we find two magnon branches, whose band structure topology (i.e., Chern numbers) we map out in a comprehensive phase diagram. Notably, besides topologically trivial and gapless phases, we identify topologically nontrivial phases that support chiral edge magnons. We show that these edge states are robust against elastic defect scattering. |
| title | Topological Magnons on the Ferromagnetic Zigzag Lattice |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2411.18515 |