各向异性异常点的实验证明
Experimental demonstration of an anisotropic exceptional point
摘要：
在许多非厄米特系统中发现了与平方根奇点相关的例外点。在大多数研究中，发现的EP是各向同性的，这意味着相同的奇异行为是独立的方向，他们在参数空间中接近。在这项工作中，我们从理论和实验上证明了存在的各向异性EP在声学系统中，表现出不同的奇异行为时，各向异性EP接近从不同的方向在参数空间。这种各向异性EP产生于具有相同手性的两个平方根EP的合并。
英文摘要：
Exceptional points (EPs) associated with a square-root singularity have been found in many non-Hermitian systems. In most of the studies, the EPs found are isotropic meaning that the same singular behavior is obtained independent of the direction from which they are approached in the parameter space. In this work, we demonstrate both theoretically and experimentally the existence of an anisotropic EP in an acoustic system that shows different singular behaviors when the anisotropic EP is approached from different directions in the parameter space. Such an anisotropic EP arises from the coalescence of two square-root EPs having the same chirality.
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