{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"e2dddaeabaf17a4a69f49842ba52236567e03327cea05504790b0d07bf105ec2","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4e26afc00b7011defe0fb8dd7e4edec02af962c3bb628d77fb25bedb149ad4e3","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5687f1d8ee8fa87e3688870709b390f30311c9313e71ed83ab3a463f35794128","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.moire-graphene-superconductivity.insulator-sc-relation","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[{"note":"","parent_revision":"4e26afc00b7011defe0fb8dd7e4edec02af962c3bb628d77fb25bedb149ad4e3","relation":"special_case"}],"plain":"Superconductivity in magic-angle graphene appears next to insulating states, as in cuprates, but devices in which a nearby metal gate screens the electron repulsion lose the insulators and keep the superconductivity, so the two may have different causes.","posed_since":"2018","precise":"Saito et al. (Nature Physics 16, 926, 2020, arXiv:1911.13302) and Stepanov et al. (Nature 583, 2020, doi:10.1038/s41586-020-2459-6) found superconductivity in twisted bilayer graphene without correlated insulators at $\\nu = \\pm2$, for twist angles detuned from 1.1 deg or with metallic gates a few nm away. Determine whether the superconductor and the correlated insulator share an origin (pairing from doping the ordered insulator) or compete for the same flat-band electrons. An answer is the dependence of $T_{c}$ and of the insulating gap on gate-screening length $d$ and twist angle, with the pairing state shown to be the same or different with and without the insulator.","problem_ref":null,"references":"","settled_by":"$T_c$, insulating-gap and gap-symmetry measurements in devices with gate distance $d$ varied from about 1 to 50 nm at fixed twist angle and strain.","status_note":"2020 screening experiments showed superconductivity can exist without the insulators; whether both share one pairing mechanism remains unsettled as of 2026.","title":"Does magic-angle superconductivity require the neighbouring correlated insulator","topic_ref":"772455301d33c1cea6c0cbed25bb79fa87ea5b401f9a667e1c0b4056e25a3e52"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"9f23ba26781c93a47988bbf50169733ce5fb29028215d09c02cb666d93c39ec0","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"f0736d6ec92cc1a2377230d81a1a23b94b4bc338fb859243f6ce6de352603def","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"tXKqnTn_VsrttRGXMt26sqp-kBY6I2nb4qwUcY_FvEHcaTG2dxkK3SWlvz4Nh_oFYyUrMWtKbxX2VzHniTnMDA"},"schema":"pubphys.envelope/1"},"record_hash":"9f23ba26781c93a47988bbf50169733ce5fb29028215d09c02cb666d93c39ec0","leaf_index":1097}