{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"a8a753d4c155e3285f9fd3e6c761dd1b8eba1128e291a7436fe8b3a766af5928","created":"2026-10-03T07:17:59Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"ad86fd5e931561094fb336712ea5da674ad59418de0fa674ee1556e3360d6089","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"cm.fractional-chern-insulators.anyon-charge-zero-field","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"Quasiparticles in these fractional states should carry one third of an electron's charge, but in the zero-field states found since 2023 this has been inferred only indirectly.","posed_since":"2023","precise":"In twisted MoTe2 or rhombohedral graphene FQAH states at $\\nu = 2/3$ and $B = 0$, measure the quasiparticle charge $e*$ from the shot-noise Fano factor at a quantum point contact or from Fabry-Perot interference periods, and the braiding phase $2\\pi/3$ by interferometry. An answer is $e*/e$ and the braiding phase with uncertainties.","problem_ref":null,"references":"","settled_by":"Shot-noise measurement giving $e* = e/3$ and an interferometer showing $2\\pi/3$ phase slips at zero applied field.","status_note":"As of 2026 only the fractional Hall conductance has been measured (transport, Streda slopes $dn/dB$, optical signatures such as arXiv:2602.04561); quasiparticle charge has not been measured by shot noise or interferometry at $B = 0$, to this survey's knowledge.","title":"Direct detection of fractional charge in zero-field fractional states","topic_ref":"99dc6b2de04e3a56515c0a5f91773afbf88a5a0f7d59aad4ce980e36539e6e22"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"a4a31d56f67ab75aa7639c949bef1989763c5805e9957f9b5db5366331bc9dcf","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"9dc84e5cad4b00601d32a90c683d5fd57689f84bac9b4f428c440fead9958b60","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"5DzZWUtCm7Lu-A89T3mR17nQcK6c6wqTf1PwxU26x5vicK1WpLFLGmF_gzy0IvEfbVIFduwZvDPEvk-fq-WGDQ"},"schema":"pubphys.envelope/1"},"record_hash":"a4a31d56f67ab75aa7639c949bef1989763c5805e9957f9b5db5366331bc9dcf","leaf_index":996}