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Chin. Phys. B, 2022, Vol. 31(6): 064304    DOI: 10.1088/1674-1056/ac4e10

Parity-time symmetric acoustic system constructed by piezoelectric composite plates with active external circuits

Yang Zhou(周扬)1, Zhang-Zhao Yang(杨彰昭)1, Yao-Yin Peng(彭尧吟)1, and Xin-Ye Zou(邹欣晔)1,2,†
1 Key Laboratory of Modern Acoustics, MOE, Institute of Acoustics, Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China;
2 State Key Laboratory of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
Abstract  Researches on parity-time (PT) symmetry in acoustic field can provide an efficient platform for controlling the travelling acoustic waves with balanced loss and gain. Here, we report a feasible design of PT-symmetric system constructed by piezoelectric composite plates with two different active external circuits. By judiciously adjusting the resistances and inductances in the external circuits, we obtain the exceptional point due to the spontaneous breaking of PT symmetry at the desired frequencies and can observe the unidirectional invisibility. Moreover, the system can be at PT exact phase or broken phase at the same frequency in the same structure by merely adjusting the external circuits, which represents the active control that makes the acoustic manipulation more convenient. Our study may provide a feasible way for manipulating acoustic waves and inspire the application of piezoelectric composite materials in acoustic structures.
Keywords:  parity-time symmetry      acoustic gain material      piezoelectric composite plate      exceptional point  
Received:  05 December 2021      Revised:  31 December 2021      Accepted manuscript online:  24 January 2022
PACS:  43.40.+s (Structural acoustics and vibration)  
  43.38.Ew (Feedback transducers)  
  43.40.Yq (Instrumentation and techniques for tests and measurement relating to shock and vibration, including vibration pickups, indicators, and generators, mechanical impedance)  
Fund: Project supported by the National Key R&D Program of China (Grant No. 2017YFA0303700), the National Natural Science Foundation of China (Grant Nos. 11634006, 11934009, and 12074184), the Natural Science Foundation of Jiangsu Province, China (Grant No. BK20191245), and the State Key Laboratory of Acoustics, Chinese Academy of Sciences.
Corresponding Authors:  Xin-Ye Zou     E-mail:

Cite this article: 

Yang Zhou(周扬), Zhang-Zhao Yang(杨彰昭), Yao-Yin Peng(彭尧吟), and Xin-Ye Zou(邹欣晔) Parity-time symmetric acoustic system constructed by piezoelectric composite plates with active external circuits 2022 Chin. Phys. B 31 064304

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