Extended Data Fig. 5. Numerical and experimental field maps for excitation at port 2.

a, Numerical predictions for excitation at port 2 for the same system as in Fig. 3 of the main text. While the anomalous phase supports transmission to port 3 regardless of the phase link distribution, the Chern phase possesses a trivial bandgap at φ = π/2, and reflects all the energy incident from port 2, see bottom right plot (the field distribution exhibits exponential decay). b, Corresponding experimental data.