{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fbc733f2a19882e0ec0b9c542e5ae8908ebba6dd550283f0ada4e37e11feb8c7","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"4fb411250fed4d188460e331593366305fa886fd5624f6665a9e98332d21cd7c","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":"1","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 (MnBi2Te4 family) and measure the axion mass and photon coupling. An answer is spectroscopic detection with the predicted dependence on applied field.","problem_ref":null,"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 MnBi2Te4; 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":"eef15c72032faa1168fa9014695d510856a871a88df07cd67b817c3027aab793"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"6725753a827cf16291b760a8961417534eb81b4b45dfa224270cbeaeae6bea1f","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"abf6c584ba7437b88caf080489a1ccd4d6dfa73b6cc2f9fb6a87bd770f18a484","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"LZRwininzXBZVIxKi04hqRI4z-RThqNN0eTtX66M2JgtxZorfmunJoPBiU367DS4JTXbxliTPkm-FRLBdfV4BQ"},"schema":"pubphys.envelope/1"},"record_hash":"6725753a827cf16291b760a8961417534eb81b4b45dfa224270cbeaeae6bea1f","leaf_index":1073}