期刊
PHYSICAL REVIEW LETTERS
卷 123, 期 19, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.123.193901
关键词
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资金
- Army Research Office (ARO) [W911NF-17-1-0481]
- National Science Foundation (NSF) [ECCS 1807552]
- NSF [ECCS 1914420: CAREER]
- UIC DPI Cycle 2 Seed Funding Program
Standard exceptional points (EPs) are non-Hermitian degeneracies that occur in open systems. At an EP, the Taylor series expansion becomes singular and fails to converge-a feature that was exploited for several applications. Here, we theoretically introduce and experimentally demonstrate a new class of parity-time symmetric systems [implemented using radio frequency (rf) circuits] that combine EPs with another type of mathematical singularity associated with the poles of complex functions. These nearly divergent exceptional points can exhibit an unprecedentedly large eigenvalue bifurcation beyond those obtained by standard EPs. Our results pave the way for building a new generation of telemetering and sensing devices with superior performance.
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