Non-Hermitian CT-Symmetric Spectral Protection of Nonlinear Defect Modes
Do Hyeok Jeon,
Mattis Reisner,
Fabrice Mortessagne
et al.
Abstract:We investigate, using a microwave platform consisting of a non-Hermitian Su-Schrieffer-Heeger array of coupled dielectric resonators, the interplay of a lossy nonlinearity and CT -symmetry in the formation of defect modes. The measurements agree with the theory which predicts that, up to moderate pumping, the defect mode is an eigenstate of the CT -symmetric operator and retains its frequency at the center of the gap. At higher pumping values, the system undergoes a self-induced explicit CT -symmetry violation… Show more
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