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The discovery of robust transport via topological states in electronic,photonic and phononic materials has deepened our understanding of wavepropagation in condensed matter with prospects for critical applications ofengineered metamaterials in communications, sensing, and controlling theenvironment. Topological protection of transmission has been demonstrated inthe face of bent paths and on-site randomness in the structure. Here we measurethe propagation of microwave radiation in a topological medium possessing timereversal symmetry with a cavity adjacent to the edge channel. Acoupled-resonance model analysis shows that the cavity is not a spin-conservingdefect and gives rise to negative time delay in transmission.

Cavity-induced backscattering in a two-dimensional photonic topological system