近日，上海科技大学物质学院的陆卫&姚碧霂&饶金威及其研究团队取得一项新进展。经过不懈努力，他们通过异常点增强磁振频率梳。相关研究成果已于2024年4月29日在国际知名学术期刊《自然—物理学》上发表。

该研究团队演示了一个非线性耦合过程，利用两种不同磁振子模式的耦合系统中的异常点，有效地产生了磁振子频率梳。这项研究方法是在低泵浦功率下产生磁振频率梳的简单和最佳路径，具有优异的异常点可调性。

据悉，频率梳具有很高的时频精度，这使得它们在精密光谱学、超灵敏探测和原子钟方面的应用非常有用。制造频率梳的传统方法依赖于材料的非线性，而这种非线性往往很弱。这些方法需要高功率密度，以超过其启动阈值，从而限制了其潜在的使用。

附：英文原文

Title: Enhancement of magnonic frequency combs by exceptional points

Author: Wang, Congyi, Rao, Jinwei, Chen, Zhijian, Zhao, Kaixin, Sun, Liaoxin, Yao, Bimu, Yu, Tao, Wang, Yi-Pu, Lu, Wei

Issue&Volume: 2024-04-29

Abstract: Frequency combs have high time–frequency accuracy, which makes them useful for applications in precision spectroscopy, ultra-sensitive detection and atomic clocks. Traditional methods of creating frequency combs hinge on material nonlinearities, which are often weak. These methods require high power densities to surpass their initiation thresholds, subsequently limiting their potential use. Here we demonstrate a nonlinear coupling process that efficiently generates magnonic frequency combs by exploiting exceptional points in a coupled system of two different magnon modes. Our approach is a simple and optimal path to produce magnonic frequency combs at low pump power with excellent tunability of exceptional points.

DOI: 10.1038/s41567-024-02478-0

Source: https://www.nature.com/articles/s41567-024-02478-0