High-order topological charges up to ±3 are realized in C4-symmetric photonic crystal slabs via parameter-driven merging of off-Γ BICs using a unified geometric framework based on Fabry-Pérot interference and guided resonances.
Powell and Willie J
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Steep expulsive potentials in 1D and 2D Schrödinger equations support continuous spectra of normalizable bound states, including even/odd states in 1D and vortex states in 2D.
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Unified Topological Dynamics of Merging Bound States in the Continuum for High-Order Topological Charges
High-order topological charges up to ±3 are realized in C4-symmetric photonic crystal slabs via parameter-driven merging of off-Γ BICs using a unified geometric framework based on Fabry-Pérot interference and guided resonances.
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The continuous spectrum of bound states in expulsive potentials
Steep expulsive potentials in 1D and 2D Schrödinger equations support continuous spectra of normalizable bound states, including even/odd states in 1D and vortex states in 2D.