| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Valley modulation and topological phase transition in staggered kagome ferromagnets |
| Yuheng Xing(邢玉恒), Wenjuan Qiu(邱文娟), Xinxing Wu(吴新星)†, and Yue Tan(谭悦)‡ |
| Department of Physics, School of Mathematics and Physics, Yancheng Institute of Technology, Yancheng 224051, China |
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Abstract Owing to their charge-free property, magnons are highly promising for achieving dissipationless transport without Joule heating, and are thus potentially applicable to energy-efficient devices. Here, we investigate valley magnons and associated valley modulations in a kagome ferromagnetic lattice with staggered exchange interaction and Dzyaloshinskii-Moriya interaction. The staggered exchange interaction breaks the spatial inversion symmetry, leading to a valley magnon Hall effect. With nonzero Dzyaloshinskii-Moriya interaction in a staggered kagome lattice, the magnon Hall effect can be observed from only one valley. Moreover, reversing the Dzyaloshinskii-Moriya interaction ($D\to -D$) and exchanging $J_{1}$ and $J_{2}$ ($J_{1} \leftrightarrow J_{2}$) can also regulate the position of the unequal valleys. With increasing Dzyaloshinskii-Moriya interaction, a series of topological phase transitions appear when two bands come to touch and split at the valleys. The valley Hall effect and topological phase transitions observed in kagome magnon lattices can be realized in thin films of insulating ferromagnets such as Lu$_{2}$V$_{2}$O$_{7}$, and will extend the basis for magnonics applications in the future.
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Received: 17 June 2024
Revised: 31 August 2024
Accepted manuscript online: 14 September 2024
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PACS:
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75.30.Ds
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(Spin waves)
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75.47.-m
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(Magnetotransport phenomena; materials for magnetotransport)
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75.70.Ak
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(Magnetic properties of monolayers and thin films)
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85.75.-d
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(Magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields)
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| Fund: We acknowledge support from the Funding for School-level Research Projects of Yancheng Institute of Technology (Grant Nos. xjr2020038, xjr2022039, and xjr2022040). |
Corresponding Authors:
Xinxing Wu, Yue Tan
E-mail: wuxinxing@ycit.edu.cn;tanyue@ycit.edu.cn
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Cite this article:
Yuheng Xing(邢玉恒), Wenjuan Qiu(邱文娟), Xinxing Wu(吴新星), and Yue Tan(谭悦) Valley modulation and topological phase transition in staggered kagome ferromagnets 2024 Chin. Phys. B 33 127503
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