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Topological valley photonics has emerged as a new frontier in photonics withmany promising applications. Previous valley boundary transport relies on kinkstates at internal boundaries between two topologically distinct domains.However, recent studies have revealed a novel class of topological chiral edgestates (CESs) at external boundaries of valley materials, which have remainedelusive in photonics. Here, we propose and experimentally demonstrate thetopological CESs in valley photonic metamaterials (VPMMs) by accurately tuningon-site edge potentials. Moreover, the VPMMs work at deep-subwavelength scales.Thus, the supported CESs are highly confined and self-guiding without relyingon a cladding layer to prevent leakage radiation. Via direct near-fieldmeasurements, we observe the bulk bandgap, the edge dispersions, and the robustedge transport passing through sharp corners, which are hallmarks of the CESs.Our work paves a way to explore novel topological edge states in valleyphotonics and sheds light on robust and miniaturized photonic devices.

Topological chiral edge states in deep-subwavelength valley photonic metamaterials