Title: Exceptional Antimodes in Multi-Drive Cavity Magnonics Show Chinese title

Title: 多驱动腔磁子学中的异常反共振模式

Abstract: Driven-dissipative systems provide a natural setting for the emergence of exceptional points -- i.e. non-Hermitian degeneracies where eigenmodes coalesce. These points are important for applications such as sensing, where enhanced sensitivity is required, and exhibit interesting and useful phenomena that can be controlled with experimentally accessible parameters. In this regard a four-port, three-mode, cavity-magnonics platform is demonstrated in which two microwave excitations can be precisely phase shifted and/or attenuated relative to one another. Destructive interference between the hybridised cavity-magnon modes is shown to give rise to antimodes (antiresonances) in the transmission spectrum, enabling coherent perfect extinction of the outgoing signals at selected ports. This interference can be used to actively tune the position and properties of exceptional points, without the fine tuning conventionally required to obtain exceptional points. Such controllable, interference-based engineering of exceptional points provides a practical and flexible pathway toward next-generation, high-sensitivity sensing devices operating at microwave frequencies. Show Chinese abstract

Abstract: 驱动耗散系统为奇异点的出现提供了一个自然环境——即非厄米简并，其中本征模合并。 这些点在传感等应用中很重要，因为需要增强的灵敏度，并表现出有趣且有用的现象，这些现象可以通过实验上可访问的参数进行控制。 在这方面，展示了一个四端口、三模腔磁子学平台，在该平台上，两个微波激发可以相对于彼此精确地进行相位偏移和/或衰减。 显示混合腔磁子模式之间的破坏性干涉会在传输谱中产生反模（反共振），从而在选定端口实现传出信号的相干完美消光。 这种干涉可用于主动调节奇异点的位置和特性，而无需通常获得奇异点所需的精细调节。 这种可控制的、基于干涉的奇异点工程为下一代在微波频率下运行的高灵敏度传感设备提供了一种实用且灵活的途径。