{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f8e4c4fee0a55bae07032f90da674f22e96b21d2076780dba37f317a78ba6737","created":"2026-10-03T07:18:00Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"ea37ff0dc6508935ad3f22093b021249872258d366437643700e69ba7b0a014f","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.magic-angle-graphene.charge-neutrality-state","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"With no electrons added, some magic-angle devices are insulators and others conduct weakly, and the state of an ideal, unstrained sample is unknown.","posed_since":"","precise":"In magic-angle twisted bilayer graphene at $\\nu = 0$, transport finds either a semimetal or an insulator depending on device, hBN alignment and heterostrain. Determine the ground state of the unaligned, low-strain system: a Kramers intervalley-coherent insulator, a valley- or spin-polarized insulator, or a nematic semimetal, the candidates of Hartree-Fock and strong-coupling theory for different strain. An answer identifies the order parameter and whether a charge gap exists at heterostrain below $0.05\\%$.","problem_ref":null,"references":"","settled_by":"STM imaging of intervalley order and tunnelling gap at $\\nu = 0$, with transport on the same devices, for samples with measured heterostrain below 0.05% and no hBN alignment.","status_note":"Samples differ and no strain-controlled identification exists as of 2026, to this survey's knowledge.","title":"Ground state of magic-angle graphene at charge neutrality","topic_ref":"5046e808e6fff9aacad641f2a7f962b0712731127198d6ca10149f1ce640621c"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"642900352eb5d6c1f661cb4b02c8879ab999a01e9d8ed05166408072601e8fc1","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"dd766fc496240626d3e6f1c59167909dda06b4120956f8c7c5d6e5c5d7c50696","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"nlb1EZxBEHOMYUKo-hwovwjLgcf6dHdEAHCvV4NIgR4VMr0oewdvUOoCvDY6pem7X2LomSqFmqL7jjH_FzmlBw"},"schema":"pubphys.envelope/1"},"record_hash":"642900352eb5d6c1f661cb4b02c8879ab999a01e9d8ed05166408072601e8fc1","leaf_index":1069}