{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"835d9bd11315341e841f2f1eb68b8148794fc8af41f718a22709efd183e8f6c4","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ba3d95e6e87789cfe6b56b95681aadac9404097a78bf2c02b6ec661cbf5c408d","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"7dbfcb31932aae079eed46f83980cebc42d59b5f26588cd0463afb7d16db2fd5","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":"2","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 $10^{-3}$ 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":"ba3d95e6e87789cfe6b56b95681aadac9404097a78bf2c02b6ec661cbf5c408d","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"8dc06909bbd90120157f317a6959566abf9ec27a2dd452ed5c7ab94038df2a58","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"0a92af6162a205094e0aab6570ebfc18b70ecd2ed706e24fa4c64217a511bade","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Iq1-XayB3bG4csW4Gy0RRgOEUZyY2NoYPvrc5RGLRb6S6yYb21XtE6C_9t_zfyhEb9DJ47uTePcPaThujG2oCA"},"schema":"pubphys.envelope/1"},"record_hash":"8dc06909bbd90120157f317a6959566abf9ec27a2dd452ed5c7ab94038df2a58","leaf_index":3010}