Proves that for Z2 insulators separated by a curved boundary the interface Z2 edge index equals (bulk Z2 difference times geometric intersection number) mod 2.
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Hierarchical resonators in quantum spin Hall lattices replicate the fundamental topological mode n-fold in frequency while preserving its spatial profile and suppressing crosstalk.
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Geometric bulk-edge correspondence for $\mathbb{Z}_2$-topological insulators
Proves that for Z2 insulators separated by a curved boundary the interface Z2 edge index equals (bulk Z2 difference times geometric intersection number) mod 2.