In a PT-symmetric waveguide, increasing the distance between gain and loss generates a ladder of resonances that can be converted into a ladder of complex eigenvalues by tuning the gain-loss amplitude.
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Spacing gain and absorption in a simple $\mathcal{PT}$-symmetric model: spectral singularities and ladders of eigenvalues and resonances
In a PT-symmetric waveguide, increasing the distance between gain and loss generates a ladder of resonances that can be converted into a ladder of complex eigenvalues by tuning the gain-loss amplitude.