{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"fb476d012f712c5e2501e60744d9b8f8ba740eb06a5a23545f0d308dd4aaf34a","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"c0396485e069c38c61b5d3126d1c929ba845c98a7a583523481f84028e03f203","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.rhombohedral-graphene.trilayer-bilayer-pairing","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"Graphene with three layers in staircase stacking, and ordinary two-layer graphene, superconduct at very low electron densities without any moire pattern, and it is disputed whether lattice vibrations or electron interactions cause the pairing.","posed_since":"2021","precise":"Rhombohedral trilayer graphene superconducts with $T_{c}$ up to about 100 mK next to isospin-symmetry-breaking transitions (Zhou et al., Nature, 2021, doi:10.1038/s41586-021-03926-0), and Bernal bilayer graphene superconducts under in-plane magnetic field or with spin-orbit coupling induced by an adjacent WSe2 layer. Determine whether pairing is mediated by acoustic phonons (Chou et al., PRL 127, 187001, 2021) or by isospin fluctuations or Kohn-Luttinger repulsion (e.g., Chatterjee et al., Nature Communications, 2022, doi:10.1038/s41467-022-33561-w). An answer reproduces $T_{c}(n,D)$ in both systems and predicts the response to gate screening.","problem_ref":null,"references":"","settled_by":"$T_{c}$ measured in devices with different gate-to-sample distances (screening suppresses electronic but not phonon pairing), compared with parameter-free calculations of both mechanisms.","status_note":"Phonon and electronic theories both remain in use as of 2026.","title":"Phonon or electronic pairing in rhombohedral trilayer and Bernal bilayer 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