{"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 graphene","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"7fd318831318913dea22c1019a18a8ca2ad0aa0d21a707c960160932807b1ed3","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"16cdf4ca7a6622c3518ddbc3ec09a4233d4d360a74ec834e3e61d8eed445027b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"VCzioYODcnpJDtUX7FVD2kAknT5w15xTBMiqIRJMHJuFl_rHc3qPrr8kif3mVn0YpNVdaoLRzv3YCjOc6pptAA"},"schema":"pubphys.envelope/1"},"record_hash":"7fd318831318913dea22c1019a18a8ca2ad0aa0d21a707c960160932807b1ed3","leaf_index":3016}