{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"d01fb150b30d75d68a7f1dda732cd68215c543f45c30629fa9c0b0e638a92758","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["67f7f056375ee2df98cfa8da72f697693056efc905d5e0f9e4f072d509f99dd6","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"fc8c73a248f7654b169c5d4c7a19b5fba7b23a39d3e16313d89fba393522ef5c","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":"2","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 $\\mathrm{WSe_2}$ 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":"67f7f056375ee2df98cfa8da72f697693056efc905d5e0f9e4f072d509f99dd6","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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