Thermodynamic origin of the phonon Hall effect in a honeycomb antiferromagnet
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arXiv
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| Autores principales: | , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2024
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| _version_ | 1866914961021730816 |
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| author | Meng, Qingkai Li, Xiaokang Liu, Jie Zhao, Lingxiao Dong, Chao Zhu, Zengwei Li, Liang Behnia, Kamran |
| author_facet | Meng, Qingkai Li, Xiaokang Liu, Jie Zhao, Lingxiao Dong, Chao Zhu, Zengwei Li, Liang Behnia, Kamran |
| contents | The underlying mechanism of the thermal Hall effect (THE) generated by phonons in a variety of insulators is yet to be identified. Here, we report on a sizeable thermal Hall conductivity in NiPS$_3$, a van der Waals stack of honeycomb layers with a zigzag antiferromagnetic order below $T_N$ = 155 K. The longitudinal ($κ_{aa}$) and the transverse ($κ_{ab}$) thermal conductivities peak at the same temperature and the thermal Hall angle, at this peak, respects a previously identified bound. The amplitude of $κ_{ab}$ is extremely sensitive to the amplitude of magnetization along the $b$-axis, in contrast to the phonon mean free path, which is not at all. We show that the magnon and acoustic phonon bands cross each other along the $b^\ast$ orientation in the momentum space. The relevance of a thermodynamic property, combined with the irrelevance of the mean free path, points to an intrinsic origin. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_13306 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermodynamic origin of the phonon Hall effect in a honeycomb antiferromagnet Meng, Qingkai Li, Xiaokang Liu, Jie Zhao, Lingxiao Dong, Chao Zhu, Zengwei Li, Liang Behnia, Kamran Strongly Correlated Electrons Other Condensed Matter Quantum Gases Statistical Mechanics The underlying mechanism of the thermal Hall effect (THE) generated by phonons in a variety of insulators is yet to be identified. Here, we report on a sizeable thermal Hall conductivity in NiPS$_3$, a van der Waals stack of honeycomb layers with a zigzag antiferromagnetic order below $T_N$ = 155 K. The longitudinal ($κ_{aa}$) and the transverse ($κ_{ab}$) thermal conductivities peak at the same temperature and the thermal Hall angle, at this peak, respects a previously identified bound. The amplitude of $κ_{ab}$ is extremely sensitive to the amplitude of magnetization along the $b$-axis, in contrast to the phonon mean free path, which is not at all. We show that the magnon and acoustic phonon bands cross each other along the $b^\ast$ orientation in the momentum space. The relevance of a thermodynamic property, combined with the irrelevance of the mean free path, points to an intrinsic origin. |
| title | Thermodynamic origin of the phonon Hall effect in a honeycomb antiferromagnet |
| topic | Strongly Correlated Electrons Other Condensed Matter Quantum Gases Statistical Mechanics |
| url | https://arxiv.org/abs/2403.13306 |