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

Youngsun Choi, Choloong Hahn, Jae Woong Yoon () and Seok Ho Song ()
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Youngsun Choi: Hanyang University
Choloong Hahn: University of Ottawa
Jae Woong Yoon: Hanyang University
Seok Ho Song: Hanyang University

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: 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.

Date: 2018
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DOI: 10.1038/s41467-018-04690-y

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