{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"0e11e45aae0157b3ac48b48678342adff11b41cf86905de0c38925a24c93306a","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"4bb3940f72b6564db76f1889fba4fd8f2de7752812d034038ab0db4dba506149","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.rhombohedral-graphene.eqah-state","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"At the lowest temperatures pentalayer graphene shows an integer quantized Hall resistance over a wide range of electron densities, replacing the fractional states, and the electronic structure behind it is unknown.","posed_since":"2024","precise":"Lu et al. (Nature 637, 1090, 2025; arXiv:2408.10203) reported an extended integer quantum anomalous Hall state, $R_{xy} = h/e^{2}$ with vanishing $R_{xx}$ over a continuous range of moire filling from $\\nu \\sim 0.5$ to $\\sim 1.3$, appearing at the lowest temperatures in rhombohedral pentalayer graphene/hBN. Identify the state: an anomalous Hall crystal (electron crystal with Chern number 1) pinned by disorder, a moire-commensurate state, or another order. An answer determines whether translation symmetry is broken and how the crystal period varies with density.","problem_ref":null,"references":"","settled_by":"Local imaging (STM or scanning single-electron transistor) of a density-dependent crystal period coexisting with quantized Hall response.","status_note":"Interpretation as an anomalous Hall crystal is not confirmed by imaging as of 2026.","title":"Nature of the extended quantum anomalous Hall state","topic_ref":"dbb59679d7d08ca030c73977f0e702fbc219a01510b953511f1e2bffa01dfa2f"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"cf8ed841e5b3a57c1a70f9a5e5fbe12503ee6f4bb6a2374930d24a4371d0d250","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"91142bdf76d2c28af72d84cf7d69628f8fe046605470460fa1f82620f14b9db8","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"gEGxRnQG2YKqf6tX3NF5dAukwSBmZoWstmfapxX18jHwNvpl-1dcz6tL09r4c2NSRrKmXYbCnFp7WlYl7L1_Cg"},"schema":"pubphys.envelope/1"},"record_hash":"cf8ed841e5b3a57c1a70f9a5e5fbe12503ee6f4bb6a2374930d24a4371d0d250","leaf_index":1143}