Diederich Geoffrey M, Nguyen Mai, Cenker John, Fonseca Jordan, Pumulo Sinabu, Bae Youn Jue, Chica Daniel G, Roy Xavier, Zhu Xiaoyang, Xiao Di, Ren Yafei, Xu Xiaodong
Department of Physics, University of Washington, Seattle, WA, USA.
Department of Physics, University of Maryland Baltimore County, Baltimore, MD, USA.
Nat Nanotechnol. 2025 May;20(5):617-622. doi: 10.1038/s41565-025-01890-8. Epub 2025 Mar 17.
Collective excitations presenting nonlinear dynamics are fundamental phenomena with broad applications. A prime example is nonlinear optics, where diverse frequency-mixing processes are central to communication and attosecond science, and extreme (>sixth-order) harmonic generation provides broad wavelength conversion. Leveraging recent progress in van der Waals magnetic semiconductors, we demonstrate nonlinear optomagnonic coupling. In the layered antiferromagnetic semiconductor CrSBr, we observe exciton states dressed by up to 20 harmonics of magnons, resulting from their extreme nonlinearities. We also create tunable optical sidebands via sum- and difference-frequency generation between two optically bright magnon modes under symmetry-breaking magnetic fields. Moreover, we can tune the observed difference-frequency generation mode into resonance with one of the fundamental magnons, which results in parametric amplification of magnons. Our findings realize the modulation of the optical-frequency exciton with the extreme nonlinearity of magnons at microwave frequencies, which could find applications in magnonics and hybrid quantum systems, and provide a method for optomagnonic neuromorphic computing devices.
呈现非线性动力学的集体激发是具有广泛应用的基本现象。一个典型例子是非线性光学，其中各种频率混合过程是通信和阿秒科学的核心，而极端（>六阶）谐波产生提供了广泛的波长转换。利用范德华磁性半导体的最新进展，我们展示了非线性光磁耦合。在层状反铁磁半导体CrSBr中，我们观察到激子态被多达20个磁振子谐波修饰，这是由于它们的极端非线性所致。我们还通过在破缺对称磁场下两个光学明亮磁振子模式之间的和频与差频产生创建了可调谐光学边带。此外，我们可以将观察到的差频产生模式调谐到与其中一个基本磁振子共振，这导致磁振子的参量放大。我们的发现实现了在微波频率下利用磁振子的极端非线性对光频激子进行调制，这可能在磁子学和混合量子系统中找到应用，并为光磁神经形态计算设备提供了一种方法。
