发散例外点附近PT对称性破缺的实验观察
Experimental observation of PT symmetry breaking near divergent exceptional points
摘要：
标准例外点（英语：Standard exceptional points）是发生在开放系统中的非厄米简并点。在EP中，泰勒级数展开变得奇异并且无法收敛-这一特性被用于多个应用。在这里，我们从理论上介绍和实验证明了一类新的奇偶时间对称系统[实施使用射频（rf）电路]，结合EP与另一种类型的数学奇点与极点的复杂功能。这些几乎发散的例外点可以表现出前所未有的大的特征值分歧超出了标准的EP。我们的研究结果为构建具有卓越性能的新一代遥测和传感设备铺平了道路。
英文摘要：
Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open systems. At an EP, the Taylor series expansion becomes singular and fails to converge -- a feature that was exploited for several applications. Here, we theoretically introduce and experimentally demonstrate a new class of parity-time symmetric systems [implemented using radio frequency (rf) circuits] that combine EPs with another type of mathematical singularity associated with the poles of complex functions. These nearly divergent exceptional points can exhibit an unprecedentedly large eigenvalue bifurcation beyond those obtained by standard EPs. Our results pave the way for building a new generation of telemetering and sensing devices with superior performance.
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