Valley-Hall interface modes persist under a 2π/3 bend for all non-vanishing group-velocity frequencies in the bulk gap except a finite exceptional set.
Generalized bulk-interface correspondence for non-quantized spin transport
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Robustness of Valley-Hall Interface Modes Against Sharp Bending
Valley-Hall interface modes persist under a 2π/3 bend for all non-vanishing group-velocity frequencies in the bulk gap except a finite exceptional set.