Zero-energy corner states in a chiral, C4v-symmetric higher-order topological insulator are protected bound states in the continuum; breaking either symmetry turns them into topological resonances.
Electric multipole moments, topological multipole moment pumping, and chiral hinge states in crystalline insulators,
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Bound states in the continuum of higher-order topological insulators
Zero-energy corner states in a chiral, C4v-symmetric higher-order topological insulator are protected bound states in the continuum; breaking either symmetry turns them into topological resonances.