Robustness of topological heterostructures against on/off scattering strength disorder. Here, for each scattering strength θ, we consider that a randomly selected quarter of the scatterers are disconnected from the external control signal and do not scatter at all (θ = 0°), while the others keep the intended scattering strength value. This situation is schematically illustrated in the inset of (b). By performing a statistic study, we find that also in this case, the functionality of the topological heterostructure is left almost undisturbed. Example of field distributions for two disorder realizations, confirming the robustness of the wave steering process.
