{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"6a91ece27521fc45b42c9878702c3f967e712a2ac7e4f6e6273751bc979ff1b6","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["8ddd91734ff7ae2c1c9948070eccf426ff0bdef9e462d62d10c0bb99f588e96a","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"a9a4825ffd02a8b7692b6c280cc7ab96e12ad488e62f734c6eb3fd35fac71e55","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":"2","parents":[],"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 $\\mathrm{La_2CuO_4}$ and $\\mathrm{Sr_2CuO_2Cl_2}$, a large negative $\\kappa_{xy}$, present for heat flow both in the $\\mathrm{CuO_2}$ 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":"8ddd91734ff7ae2c1c9948070eccf426ff0bdef9e462d62d10c0bb99f588e96a","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a74e102d57090563f754bac84657165db02ed18b5348b8ff999d7418f818b1d7","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"4e1540de094aa898709a3133ac692dc32343f8ac5a0f84cb3d831cc3e9dbcfa6","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"sxONr1PZW93WZ0So4Fl-GywjlGqBWR33jFgzduwiRHOjHhmWP-Lzh1gBdPF8Ar9BdvZvnly18MBNbX7FlyMKAg"},"schema":"pubphys.envelope/1"},"record_hash":"a74e102d57090563f754bac84657165db02ed18b5348b8ff999d7418f818b1d7","leaf_index":2990}