Youdong Duan , Lei Zhang , Yonghui Zhang , Linlin Geng , Qiuquan Guo , Jun Yang , Gengkai Hu , Xiaoming Zhou
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引用次数: 0
Abstract
Dynamic encircling of an anti-parity-time (anti-PT) symmetric exceptional point (EP) leads to chiral transfer of symmetry-broken modes, which has been explored in various systems except acoustics. In this work, acoustic counterpart of this behavior is numerically demonstrated in coupled waveguide systems with anti-PT-symmetric EPs. The model consists of three coupled waveguides designed to mimic a three-state system that can be described by the coupled mode theory. By adiabatically eliminating the intermediate state with high loss, the anti-PT symmetry and associated EP can be formed in an effective system comprising the remaining two states. According to the parametric path enclosing the EP, acoustic propagation model is designed to support the space-driven acoustic mode evolution. Numerical simulations are conducted to demonstrate acoustic chiral transfer of symmetry-broken states.
反奇偶性时间(anti-PT)对称例外点(EP)的动态环绕会导致对称破缺模式的手性转移,这已在除声学之外的各种系统中进行了探索。在这项工作中,在具有反PT 对称例外点的耦合波导系统中,这种行为的声学对应物得到了数值证明。该模型由三个耦合波导组成,旨在模拟可由耦合模式理论描述的三态系统。通过绝热消除具有高损耗的中间状态,反PT 对称性和相关 EP 可以在由其余两个状态组成的有效系统中形成。根据包围 EP 的参数路径,设计了声学传播模型,以支持空间驱动的声学模式演化。数值模拟证明了对称性断裂态的声学手性传递。
期刊介绍:
Extreme Mechanics Letters (EML) enables rapid communication of research that highlights the role of mechanics in multi-disciplinary areas across materials science, physics, chemistry, biology, medicine and engineering. Emphasis is on the impact, depth and originality of new concepts, methods and observations at the forefront of applied sciences.