{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"1ca95ebbeffd5ef7deb96189ddf9225db15dffb84b67483115f6ed14bc28a6b6","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["6725753a827cf16291b760a8961417534eb81b4b45dfa224270cbeaeae6bea1f","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"89da293a9422b89411b7dda199088b64cb883bd1b6a7c47500f216860f816b51","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.magnetic-topological-insulators.axion-quasiparticle","kind":"well-posed","literature_status":"partially-resolved","n":"2","parents":[],"plain":"In antiferromagnetic topological insulators, magnetic fluctuations should make the axion angle oscillate, producing a collective excitation that mixes with light, and its coupling to light has not been observed.","posed_since":"2010","precise":"Li, Wang, Qi and Zhang (Nature Physics, 2010) predicted that in antiferromagnetic topological insulators the axion field $\\theta(r,t)$ acquires dynamics through coupling to the Neel order, giving an axion quasiparticle that hybridizes with photons into axion polaritons under a static magnetic field. 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 insulators","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"2b68e2613839a590684e4ab948391ed69386735b162b281c05cbf73523ad34e3","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"27a3af71dcee7ec4aac27d31cff1d0d8307a2200c80e7b83b763308d87adce19","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"TR545Z8oamIrqXZKEPJqp0KiwS7cFjKpquztbDYNgyHDk2DB326GIFvxT9JKelb_PjhcleFVLW7p5Clh7K7MAg"},"schema":"pubphys.envelope/1"},"record_hash":"2b68e2613839a590684e4ab948391ed69386735b162b281c05cbf73523ad34e3","leaf_index":2916}