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Observation of an anti-PT-symmetric exceptional point and energy-difference conserving dynamics in electrical circuit resonators

Author

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  • Youngsun Choi

    (Hanyang University)

  • Choloong Hahn

    (University of Ottawa)

  • Jae Woong Yoon

    (Hanyang University
    Electronics and Telecommunications Research Institute)

  • Seok Ho Song

    (Hanyang University)

Abstract

Parity-time (PT) symmetry and associated non-Hermitian properties in open physical systems have been intensively studied in search of new interaction schemes and their applications. Here, we experimentally demonstrate an electrical circuit producing key non-Hermitian properties and unusual wave dynamics grounded on anti-PT (APT) symmetry. Using a resistively coupled amplifying-LRC-resonator circuit, we realize a generic APT-symmetric system that enables comprehensive spectral and time-domain analyses on essential consequences of the APT symmetry. We observe an APT-symmetric exceptional point (EP), inverse PT-symmetry breaking transition, and counterintuitive energy-difference conserving dynamics in stark contrast to the standard Hermitian dynamics keeping the system’s total energy constant. Therefore, we experimentally confirm unique properties of APT-symmetric systems, and further development in other areas of physics may provide new wave-manipulation techniques and innovative device-operation principles.

Suggested Citation

  • Youngsun Choi & Choloong Hahn & Jae Woong Yoon & Seok Ho Song, 2018. "Observation of an anti-PT-symmetric exceptional point and energy-difference conserving dynamics in electrical circuit resonators," Nature Communications, Nature, vol. 9(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-04690-y
    DOI: 10.1038/s41467-018-04690-y
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    Cited by:

    1. Yumeng Yang & Xinrong Xie & Yuanzhen Li & Zijian Zhang & Yiwei Peng & Chi Wang & Erping Li & Ying Li & Hongsheng Chen & Fei Gao, 2022. "Radiative anti-parity-time plasmonics," Nature Communications, Nature, vol. 13(1), pages 1-8, December.
    2. Sadeq Bahmani & Amir Nader Askarpour, 2023. "Anomalous Floquet topological phase in a lattice of LC resonators," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 96(6), pages 1-11, June.

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