{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c75efb19bacab8d5ed362d783660477d49fb25b238721d857dd9edab60f88c72","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"d57cf3d89d0597e8a1de014d68f2e378132c9f376f796cf7c97241f9a11b87cd","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"mechanism","assisted_by":[],"external_id":"cm.magic-angle-graphene.linear-resistivity","kind":"phenomenon","literature_status":"contested","n":"1","parents":[],"plain":"Near the magic angle the electrical resistance grows in direct proportion to temperature over a wide range, a strange-metal behaviour also seen in cuprates, and its cause is unknown.","posed_since":"2019","precise":"In twisted bilayer graphene near $\\theta \\sim 1.1\\,\\mathrm{deg}$, $\\rho(T) \\sim A T$ from $\\sim 1\\,\\mathrm{K}$ to tens of K, with slope $A$ growing on approach to the magic angle and, at some fillings, a scattering rate near the Planckian value $\\hbar/\\tau \\sim k_B T$. Determine whether this comes from electron-acoustic-phonon scattering enhanced by flat-band velocity renormalization or from electronic quantum criticality. An answer predicts $A(\\theta, \\nu)$ and the low-temperature cutoff quantitatively.","problem_ref":null,"references":"","settled_by":"Measurement of $A$ versus $\\theta$ and $\\nu$ compared with a parameter-free phonon calculation, plus tests in which phonons are altered or electronic fluctuations suppressed.","status_note":"Phonon-based (2019) and Planckian electronic (2020-2022) interpretations both remain in use as of 2026.","title":"Origin of linear-in-temperature resistivity near the magic angle","topic_ref":"5046e808e6fff9aacad641f2a7f962b0712731127198d6ca10149f1ce640621c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"10ef410fdc75d08790867f29d826a26089807ca0f05d4c9298ca7894cd823ed0","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"743a69402adbc412fed926319a878fe88a114417b141064c7f3c10b254dc162b","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"vu1mpXyPHz0QU7_fDZC2Zmu404dlKual3NJ1rz1WACbK_07d0KSUu0G-rj_gYS_geqT2jj32mGG0A4tosK3eAw"},"schema":"pubphys.envelope/1"},"record_hash":"10ef410fdc75d08790867f29d826a26089807ca0f05d4c9298ca7894cd823ed0","leaf_index":1072}