Valley modulation and topological phase transition in staggered kagome ferromagnets

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外文标题：Valley modulation and topological phase transition in staggered kagome ferromagnets

外文摘要：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 →-D)and exchanging J1 and J2(J1 ↔ J2)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 Lu2V2O7,and will extend the basis for magnonics applications in the future.

外文关键词：

valley modulationDzyaloshinskii-Moriya interactionstaggered kagome ferromagnetstopolog-ical phase transitionsmagnon Hall effect

作者：

邢玉恒、邱文娟、吴新星、谭悦

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作者单位：

Department of Physics,School of Mathematics and Physics,Yancheng Institute of Technology,Yancheng 224051,China

关键词：

valley modulation Dzyaloshinskii-Moriya interaction staggered kagome ferromagnets topolog-ical phase transitions magnon Hall effect

出版年：

2024

DOI：

10.1088/1674-1056/ad7af7

中国物理B(英文版)

中国物理学会和中国科学院物理研究所

中国物理B(英文版)

CSTPCDEI

影响因子：0.995

ISSN：1674-1056

年,卷(期)：2024.33(12)