期刊
PHYSICAL REVIEW A
卷 84, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.84.040101
关键词
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资金
- AFOSR [FA 9550-10-1-0433]
- NSF [ECCS-1128571]
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1128571] Funding Source: National Science Foundation
Mutually coupled modes of a pair of active LRC circuits, one with amplification and another with an equivalent amount of attenuation, provide an experimental realization of a wide class of systems where gain and loss mechanisms break the Hermiticity while preserving parity-time PT symmetry. For a value gamma(PT) of the gain and loss strength parameter the eigenfrequencies undergo a spontaneous phase transition from real to complex values, while the normal modes coalesce, acquiring a definite chirality. The consequences of the phase transition in the spatiotemporal energy evolution are also presented.
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