{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"abf6b9dc838415e29d32efbe4c0246acbe73533ae1e6989977602fd69322b8cb","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"19440a3969140c54b79fa9139076fa50e8da71ccf4db70f8c28ce7c99c1998e5","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.rhombohedral-graphene.fqah-quantization","kind":"well-posed","literature_status":"partially-resolved","n":"1","parents":[],"plain":"In a true fractional quantum Hall state the sideways resistance equals an exact fraction of a natural constant and the forward resistance vanishes, and early graphene data fell short of both.","posed_since":"2024","precise":"In rhombohedral multilayer graphene/hBN at $B=0$, determine whether the FQAH states at $\\nu=2/3,\\ 3/5$ and others reach $R_{xy}=h/(\\nu e^{2})$ within 1e-3 with $R_{xx}\\to0$ as $T\\to0$, and extract their activation gaps. Early (2024) data had $R_{xx}$ of order kilo-ohms. An answer gives quantization accuracy and gap for each state.","problem_ref":null,"references":"","settled_by":"Transport at electron temperatures below 20 mK on several devices with independent contact and geometry checks.","status_note":"2025 measurements below $40\\,\\mathrm{mK}$ found smaller $R_{xx}$ and new FQAH states; a September 2026 preprint (arXiv:2609.09422) reports fractional quantized anomalous Hall insulators, pending independent confirmation.","title":"Precision quantization of zero-field fractional Hall states in graphene","topic_ref":"dbb59679d7d08ca030c73977f0e702fbc219a01510b953511f1e2bffa01dfa2f"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"ba3d95e6e87789cfe6b56b95681aadac9404097a78bf2c02b6ec661cbf5c408d","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"b08fa48b37bf741bcbc53f6a58d84abd0e266ff73860dd14e79c9264c64be94a","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"qfx3KPmIZrJgonaSqGfJrVwtUWJrgDV6StNkv2FRzM1Dfk9efNAl2vPaFJhLLr-n_koq__6E6mtwhl4B8wUoDw"},"schema":"pubphys.envelope/1"},"record_hash":"ba3d95e6e87789cfe6b56b95681aadac9404097a78bf2c02b6ec661cbf5c408d","leaf_index":1144}