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Simulated field amplitude maps excited by a wave input at port 1, for different values of the scattering strength, namely = 0, 15, and 30. At = 0 (top,Sis in anomalous phase), the input wave travels undisturbed along the top boundary, and is unidirectionally transmitted to port 3, with zero transmission to port 2. Conversely, at = 30 (bottom,Sis in Chern phase), the nonreciprocal wave is steered to port 2 along the anomalous-Chern interface, with vanishing transmission to port 3. Near the transition (middle panel), an intermediate behavior with coupling into bulk is observed, due to partial wave transmission through the middle region.

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