Evidence for Topological Magnon-Phonon Hybridization in a 2D Antiferromagnet down to the Monolayer Limit
Evidence for Topological Magnon-Phonon Hybridization in a 2D Antiferromagnet down to the Monolayer Limit
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DOI：
10.1021/acs.nanolett.3c00351
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发表时间：
2023-02-16
期刊：
影响因子：
10.8
通讯作者：
Zhu, Hanyu
中科院分区：
文献类型：
--
作者：
Luo, Jiaming;Li, Shuyi;Zhu, Hanyu
拓扑声子和磁振子潜在地使得能够在原子尺度上实现信息和能量的低损耗、量子相干和手性传输。货车瓦磁性材料由于其最近发现的电子、自旋和晶格自由度之间的强相互作用而有希望实现这样的状态。本文报道了利用腔增强磁拉曼光谱首次在单层反铁磁体FePSe 3中观测到磁振子和声子的相干杂化。即使在零磁场下，也会出现2D极限下的强磁振子-声子协同效应，这使得与磁振子的强耦合导致纵向和横向光学声子之间的非平凡带反转。自旋和晶格对称性理论上保证了磁场控制的拓扑相变，验证了非零的陈数从耦合自旋晶格模型计算。二维拓扑磁振子-声子杂化可能为量子声子学和磁振子学提供了一条新的途径。
Topological phonons and magnons potentially enable low-loss, quantum coherent, and chiral transport of information and energy at the atomic scale. Van der Waals magnetic materials are promising to realize such states due to their recently discovered strong interactions among the electronic, spin, and lattice degrees of freedom. Here, we report the first observation of coherent hybridization of magnons and phonons in monolayer antiferromagnet FePSe3 by cavity-enhanced magneto-Raman spec-troscopy. The robust magnon-phonon cooperativity in the 2D limit occurs even in zero magnetic field, which enables nontrivial band inversion between longitudinal and transverse optical phonons caused by the strong coupling with magnons. The spin and lattice symmetry theoretically guarantee magnetic-field-controlled topo-logical phase transition, verified by nonzero Chern numbers calculated from the coupled spin-lattice model. The 2D topological magnon-phonon hybridization potentially offers a new route toward quantum phononics and magnonics with an ultrasmall footprint.