Unidirectional invisibility induced by parity-time symmetric circuit

Bo Lv, Jiahui Fu*, Bian Wu, Rujiang Li, Qingsheng Zeng, Xinhua Yin, Qun Wu, Lei Gao, Wan Chen, Zhefei Wang, Zhiming Liang, Ao Li, Ruyu Ma

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Parity-time (PT) symmetric structures present the unidirectional invisibility at the spontaneous PT-symmetry breaking point. In this paper, we propose a PT-symmetric circuit consisting of a resistor and a microwave tunnel diode (TD) which represent the attenuation and amplification, respectively. Based on the scattering matrix method, the circuit can exhibit an ideal unidirectional performance at the spontaneous PT-symmetry breaking point by tuning the transmission lines between the lumped elements. Additionally, the resistance of the reactance component can alter the bandwidth of the unidirectional invisibility flexibly. Furthermore, the electromagnetic simulation for the proposed circuit validates the unidirectional invisibility and the synchronization with the input energy well. Our work not only provides an unidirectional invisible circuit based on PT-symmetry, but also proposes a potential solution for the extremely selective filter or cloaking applications.

Original languageEnglish
Article number40575
JournalScientific Reports
StatePublished - 18 Jan 2017
Externally publishedYes


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