Experimental Observation of PT Symmetry Breaking near Divergent Exceptional Points.
Document Type
Article
Publication Date
11-8-2019
Department
Department of Physics
Abstract
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.
Publication Title
Physical review letters
Recommended Citation
Sakhdari, M.,
Hajizadegan, M.,
Zhong, Q.,
Christodoulides, D.,
El-Ganainy, R.,
&
Chen, P.
(2019).
Experimental Observation of PT Symmetry Breaking near Divergent Exceptional Points..
Physical review letters,
123(19), 193901-193901.
http://doi.org/10.1103/PhysRevLett.123.193901
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/1451