We demonstrate that a conventional hollow conductor waveguide filled with a material exhibiting the coexistence of chiral magnetic and anomalous quantum Hall effects supports the propagation of transverse electromagnetic modes. This simple setup provides a direct and optically feasible method to probe the simultaneous presence of these phenomena, potentially enabling the detection of an emergent axion-like field within condensed matter systems.

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• Optical & microwave phenomena
• Quantum anomalous Hall effect
• Topological phases of matter
• Axions
• Dirac semimetal
• Waveguides
• Weyl semimetal
• Chiral symmetry
• Electromagnetic wave theory
• Inversion symmetry
• P-symmetry
• Plane-wave expansion
• T-symmetry