{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a7b6c097cfe31c81f5ab73157f6db5f340880b19123525e76b7bc76c34c8da07","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011","cdeabbeea29a0e0a73646cc5ad97161b617805327ba35f4e49f91a7f93c949de"],"salt":"234db50a8b0ef5cd8c96d1ad3ba0b4228596016a0635fbb972d93f0ce41b781a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.phonon-thermal-hall.cuprate-chiral-phonons","kind":"phenomenon","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"cdeabbeea29a0e0a73646cc5ad97161b617805327ba35f4e49f91a7f93c949de","relation":"special_case"}],"plain":"In copper-oxide superconductors, phonons gain a large sideways heat flow below the doping where the pseudogap state appears and also in the undoped insulating parents. What gives phonons this handedness is unknown.","posed_since":"2019","precise":"In hole-doped cuprates inside the pseudogap phase and in the Mott insulators La2CuO4 and Sr2CuO2Cl2, a large negative $\\kappa_{xy}$, present for heat flow both in the CuO2 planes and along $c$, is attributed to phonons (Grissonnanche et al. 2019, 2020); a planar thermal Hall response with $B$ in the plane was reported in 2024 (Chen et al., Physical Review X 14, 041011). Identify what couples phonons to $B$ (spin fluctuations of the antiferromagnetic background, defects, or charge-order domains) and predict the doping, field-direction and temperature dependence.","problem_ref":null,"references":"","settled_by":"A microscopic coupling that predicts doping, field-direction and temperature dependence, checked across hole- and electron-doped cuprates and across defect densities.","status_note":"","title":"Origin of the large phonon thermal Hall effect in cuprates","topic_ref":"046be39fdf1a48ed3142232d4b04a481e5d83239067e46a752877f036dcaa5c1"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"8ddd91734ff7ae2c1c9948070eccf426ff0bdef9e462d62d10c0bb99f588e96a","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f0bcff51afbc9b39b80c4980d06183fee255553025a28a97d288a3fce3f3c932","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"SnyXwT_G5dOIHvGpYent26QuVNgsJOhprZqmX1mFDP161ZskgKP5J1dIIUZEXflndAPL5-82KbGWaQsgLhFhBw"},"schema":"pubphys.envelope/1"},"record_hash":"8ddd91734ff7ae2c1c9948070eccf426ff0bdef9e462d62d10c0bb99f588e96a","leaf_index":1127}