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Abstract Antichiral states propagate in the same direction on opposite boundaries, defying the conventional constraint that boundary modes must cancel net chirality. Previously found antichiral states have been limited to first-order topological semimetals. However, antichiral hinge states—the antichiral counterpart of recently discovered higher-order chiral hinge states—remain elusive.
Abstract Topological valley photonics enables on-chip light transport robust against backscattering, but valley edge states typically lie outside the light cone and cannot be directly excited from free space. Existing devices with radiative functionality mainly exploit on-chip–to–free-space emission through strongly leaky modes, where enhanced radiative coupling compromises transport performance.
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