Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl3
Gigahertz Frequency Antiferromagnetic Resonance and Strong Magnon-Magnon Coupling in the Layered Crystal CrCl3
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DOI：
10.1103/physrevlett.123.047204
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发表时间：
2019-07-24
影响因子：
8.6
通讯作者：
Liu, Luqiao
中科院分区：
文献类型：
--
作者：
MacNeill, David;Hou, Justin T.;Liu, Luqiao
我们报告宽带微波吸收光谱的层状反铁磁体CrCl 3。我们观察到一个丰富的结构所产生的准二维反铁磁动力学的共振。由于这种材料中的弱层间磁耦合，我们能够观察到在GHz频率范围内的反铁磁共振的光学和声学分支以及它们之间的受保护的交叉。通过旋转对称性破缺，我们进一步证明了在两个共振模之间可以诱导出强的磁振子-磁振子耦合，并具有大的可调带隙。
We report broadband microwave absorption spectroscopy of the layered antiferromagnet CrCl3. We observe a rich structure of resonances arising from quasi-two-dimensional antiferromagnetic dynamics. Because of the weak interlayer magnetic coupling in this material, we are able to observe both optical and acoustic branches of antiferromagnetic resonance in the GHz frequency range and a symmetry-protected crossing between them. By breaking rotational symmetry, we further show that strong magnon-magnon coupling with large tunable gaps can be induced between the two resonant modes.