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Determine whether the polariton exists in a candidate material ($\\mathrm{MnBi_2Te_4}$ family) and measure the axion mass and photon coupling. An answer is spectroscopic detection with the predicted dependence on applied field.","problem_ref":"6725753a827cf16291b760a8961417534eb81b4b45dfa224270cbeaeae6bea1f","references":"","settled_by":"Terahertz or microwave spectroscopy showing a polariton gap that scales with the applied field and disappears outside the antiferromagnetic phase.","status_note":"A 2025 ultrafast-optics study reported coherent axion-mode oscillations in 2D $\\mathrm{MnBi_2Te_4}$; axion-polariton hybridization with light is not observed as of 2026, to this survey's knowledge.","title":"Axion quasiparticle and axion polariton in antiferromagnetic topological 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