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Topological matter and topological optics have been studied in many systems,with promising applications in materials science and photonics technology.These advances motivate the study of the interaction between topological matterand light, as well as topological protection in light-matter interactions. Inthis work, we study a waveguide-interfaced topological atom array. Thelight-matter interaction is nontrivially modified by topology, yielding noveloptical phenomena. We find topology-enhanced photon absorption from thewaveguide for large Purcell factor, i.e., $\Gamma/\Gamma_0\gg 1$, where$\Gamma$ and $\Gamma_0$ are the atomic decays to waveguide and environment,respectively. To understand this unconventional photon absorption, we propose amulti-channel scattering approach and study the interaction spectra for edge-and bulk-state channels. We find that, by breaking inversion and time-reversalsymmetries, optical anisotropy is enabled for reflection process, but thetransmission is isotropic. Through a perturbation analysis of the edge-statechannel, we show that the anisotropy in the reflection process originates fromthe waveguide-mediated non-Hermitian interaction. However, the inversionsymmetry in the non-Hermitian interaction makes the transmission isotropic. Ata topology-protected atomic spacing, the subradiant edge state exhibits hugeanisotropy. Due to the interplay between edge- and bulk-state channels, a largetopological bandgap enhances nonreciprocal reflection of photons in thewaveguide for weakly broken time-reversal symmetry, i.e., $\Gamma_0/\Gamma\ll1$, producing complete photon absorption. We show that our proposal can beimplemented in superconducting quantum circuits. The topology-enhanced photonabsorption is useful for quantum detection. This work shows the potential tomanipulate light with topological quantum matter.

Topology-Enhanced Nonreciprocal Scattering and Photon Absorption in a Waveguide