Spin Quenching and Transport by Hidden Dzyaloshinskii-Moriya Interactions
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| Main Authors: | , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916874170662912 |
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| author | Ye, Xiyin Cui, Qirui Lin, Weiwei Yu, Tao |
| author_facet | Ye, Xiyin Cui, Qirui Lin, Weiwei Yu, Tao |
| contents | Explicit interactions, \textit{e.g.}, dipolar and exchange couplings, usually govern magnetization dynamics. Some interactions may be hidden from the global crystal symmetry. We report that in a large class of \textit{uniaxial} antiferromagnets, a \textit{hidden} Dzyaloshinskii-Moriya interaction with retaining global inversion symmetry quenches the spin of magnon along the Néel vector ${\bf n}$, thus forbidding its angular-momentum flow. Some magnon spins, termed ``nodal" and ``corner" spins, survive when they distribute \textit{singularly} at the hot spots, i.e., high-symmetric degeneracy points in the Brillouin zone, and are protected by crystal symmetries. The biased magnetic field along ${\bf n}$ broadens such distributions, allowing bulk spin transport with unique signatures in the magnetic field and temperature dependencies. This explains recent experiments and highlights the role of hidden interaction. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_06690 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Spin Quenching and Transport by Hidden Dzyaloshinskii-Moriya Interactions Ye, Xiyin Cui, Qirui Lin, Weiwei Yu, Tao Mesoscale and Nanoscale Physics Materials Science Explicit interactions, \textit{e.g.}, dipolar and exchange couplings, usually govern magnetization dynamics. Some interactions may be hidden from the global crystal symmetry. We report that in a large class of \textit{uniaxial} antiferromagnets, a \textit{hidden} Dzyaloshinskii-Moriya interaction with retaining global inversion symmetry quenches the spin of magnon along the Néel vector ${\bf n}$, thus forbidding its angular-momentum flow. Some magnon spins, termed ``nodal" and ``corner" spins, survive when they distribute \textit{singularly} at the hot spots, i.e., high-symmetric degeneracy points in the Brillouin zone, and are protected by crystal symmetries. The biased magnetic field along ${\bf n}$ broadens such distributions, allowing bulk spin transport with unique signatures in the magnetic field and temperature dependencies. This explains recent experiments and highlights the role of hidden interaction. |
| title | Spin Quenching and Transport by Hidden Dzyaloshinskii-Moriya Interactions |
| topic | Mesoscale and Nanoscale Physics Materials Science |
| url | https://arxiv.org/abs/2410.06690 |