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Non-Hermitian CT-Symmetric Spectral Protection of Nonlinear Defect Modes
Do Hyeok Jeon1, Mattis Reisner2, Fabrice Mortessagne2
1Wave Transport in Complex Systems Lab, Physics Department, Wesleyan University, Middletown, Connecticut 06459, USA.
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 which removes the spectral topological protection and alters the shape of the defect mode.
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