School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China.
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, Shanghai 200083, China.
Phys Rev Lett. 2023 Jan 27;130(4):046705. doi: 10.1103/PhysRevLett.130.046705.
We observe a power-dependent anticrossing of Walker spin-wave modes under microwave pumping when a ferrimagnet is placed in a microwave waveguide that does not support any discrete photon mode. We interpret this unexpected anticrossing as the generation of a pump-induced magnon mode that couples strongly to the Walker modes of the ferrimagnet. This anticrossing inherits an excellent tunability from the pump, which allows us to control the anticrossing via the pump power, frequency, and waveform. Further, we realize a remarkable functionality of this anticrossing, namely, a microwave frequency comb, in terms of the nonlinear interaction that mixes the pump and probe frequencies. Such a frequency comb originates from the magnetic dynamics and thereby does not suffer from the charge noise. The unveiled hybrid magnonics driven away from its equilibrium enriches the utilization of anticrossing for coherent information processing.
我们在微波泵浦下观察到铁磁体置于不支持任何离散光子模式的微波波导中时，Walker 自旋波模式的功率相关反交叉。我们将这种意外的反交叉解释为产生了一种与铁磁体的 Walker 模式强烈耦合的泵激磁振子模式。这种反交叉继承了泵浦的出色可调性，允许我们通过泵浦功率、频率和波形来控制反交叉。此外，我们还通过泵浦和探测频率的非线性相互作用，实现了这种反交叉的一个显著功能，即微波频率梳。这种频率梳源于磁动力学，因此不受电荷噪声的影响。这种偏离其平衡状态的混合磁振子丰富了反交叉在相干信息处理中的应用。
