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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.
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Liu et al. (2024) studied this question.
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