Multi-Channel Selective Light Transmission Based on Hybrid Topological Photonic Crystals

We observed the coexistence of quantum anomalous Hall and valley Hall phases in the same photonic band gap. Under the broken time-reversal and parity symmetries, the phase tran-sition between the two topological phases can be flexibly manipu-lated. Relying on the bulk-edge correspondence, we built a pho-tonic waveguide with various boundary configurations that functioned with multi-channel selective light transmission.