Chern insulator systems are realizable in numerous physical systems and can support robust nonreciprocal transmission of energy. A routing functionality constructed from two counteroriented Chern insulator regions, using coupled Haldane-type systems is proposed. By adjusting the strength of a magnetic field and the frequency of an antenna source, it is possible to steer the flow of energy either completely to the left, completely to the right, or split. Alternatively, two sources can be used to direct the flow of energy. This formulation has the potential to serve as a robust and reconfigurable component in optical transmission.

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• Non-reciprocal propagation
• Non-reciprocal transmission
• Optical isolators
• Optics & lasers
• Photonics