{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a7dab7c0b89c7890f417aeed5031078b8d8454bb450cd8d80b61fcd5f977bc77","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["4e26afc00b7011defe0fb8dd7e4edec02af962c3bb628d77fb25bedb149ad4e3","5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"5b7293274ddd4933777c90c06a4c877b1a76264329425ccd446b19ecb923b68a","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"classification","assisted_by":[],"external_id":"cm.moire-graphene-superconductivity.gap-symmetry","kind":"well-posed","literature_status":"open","n":"1","parents":[{"note":"","parent_revision":"4e26afc00b7011defe0fb8dd7e4edec02af962c3bb628d77fb25bedb149ad4e3","relation":"special_case"}],"plain":"The energy needed to break an electron pair may vanish along certain directions (nodes) or stay finite everywhere, and which case holds narrows the possible pairing mechanisms.","posed_since":"","precise":"Determine whether the superconducting gap of magic-angle twisted bilayer graphene near $\\nu = -2 - \\delta$ has nodes on the Fermi surface, and its irreducible representation under the $D_6$ point group ($D_3$ or lower with strain) combined with valley symmetry. Existing evidence is V-shaped tunnelling spectra and power-law superfluid stiffness $D_s(T)$ for $T << T_c$. An answer requires a phase-sensitive or momentum-resolved probe (Josephson interference, quasiparticle interference, or thermal conductivity $\\kappa/T$ as $T \\to 0$).","problem_ref":null,"references":"","settled_by":"A phase-sensitive Josephson or quasiparticle-interference measurement identifying gap sign changes, consistent with low-temperature $\\kappa/T$.","status_note":"2021 tunnelling spectra and 2025 microwave superfluid-stiffness measurements (Tanaka et al., Nature 2025) both suggest gap nodes; no phase-sensitive test as of 2026.","title":"Nodal or fully gapped superconducting order in magic-angle 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