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Axion insulators are 3D magnetic higher-order topological insulatorsprotected by inversion-symmetry that exhibit hinge-localized chiral channelsand induce quantized topological magnetoelectric effects. Recent research hassuggested that axion insulators may be capable of detecting dark-matteraxion-like particles by coupling to their axionic excitations. Beyond itsfundamental theoretical interest, designing a photonic AXI offers the potentialto enable the development of magnetically-tunable photonic switch devicesthrough the manipulation of the axionic modes and their chiral propagationusing external magnetic fields. Motivated by these facts, in this work, wepropose a novel approach to induce axionic band topology in gyrotropic 3D Weylphotonic crystals gapped by supercell modulation. To quantize an axionic angle,we create domain-walls across inversion-symmetric photonic crystals,incorporating a phase-obstruction in the supercell modulation of theirdielectric elements. This allows us to bind chiral channels oninversion-related hinges, ultimately leading to the realization of an axionicchiral channel of light. Moreover, by controlling the material gyrotropicresponse, we demonstrate a physically accessible way of manipulating theaxionic modes through a small external magnetic bias, which provides aneffective topological switch between different 1D chiral photonic fiberconfigurations. Remarkably, the unidirectional axionic hinge states supportedby the photonic axion insulator are buried in a fully connected 3D dielectricstructure, thereby being protected from radiation through the electromagneticcontinuum. As a result, they are highly suitable for applications inguided-light communication, where the preservation and non-reciprocalpropagation of photonic signals are of paramount importance.

Axion Topology in Photonic Crystal Domain Walls