The onset threshold for time-growing bound states in a PT-symmetric chain of N unit cells is γ_c = 2 sin[π/(4N)], below which time-independent scattering remains physical.
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Supercritical coupling emerges from causality-driven reactive coupling in bright-dark supermodes, producing an open-Dirac singularity and generalized BICs where radiative losses and effective gain balance to diverge the total Q factor.
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Physical relevance of time-independent scattering predictions in periodic $\mathcal{PT}$-symmetric chains
The onset threshold for time-growing bound states in a PT-symmetric chain of N unit cells is γ_c = 2 sin[π/(4N)], below which time-independent scattering remains physical.
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Theory of Supercritical Coupling And Generalized Bound States in the Continuum
Supercritical coupling emerges from causality-driven reactive coupling in bright-dark supermodes, producing an open-Dirac singularity and generalized BICs where radiative losses and effective gain balance to diverge the total Q factor.