Observation of topological valley Hall edge states in honeycomb lattices of superconducting microwave resonators

We have designed honeycomb lattices for microwave photons with a frequency imbalance between the two sites in unit cell. This is equivalent of mass term that breaks lattice inversion symmetry. At interface opposite imbalance, we observe topological valley edge states. By imaging spatial dependence modes along interface, obtain their dispersion relation compare to predictions an ab initio tight-binding model describing our photonic lattices.