{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"3cad24bb5f89e22e41df29c492241998001c20d55162860af520efb627362f01","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["a4a31d56f67ab75aa7639c949bef1989763c5805e9957f9b5db5366331bc9dcf","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"27b6b1e669d85eef9a73ed6d3e0fdb07bc54a8e10769d4eb9b5d4a3f0f5367ad","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":"2","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 $\\mathrm{MoTe_2}$ 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":"a4a31d56f67ab75aa7639c949bef1989763c5805e9957f9b5db5366331bc9dcf","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":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"4c9cc880b6f60c03c3f3e21217672c535588e63a91d06eb37e6fdf8b3911b5bb","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"e2210a8feee654ae1754249d5623fa8d74d24b808d834350081a8bb90bf2c708","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"Ax8-m6AmffpEpgT7s0an1N_VF3yxniqEeg3O0io2oY_ojhIidjklMuitbuzr3F-V2j1JtCKuMmSNj8A5Sc3AAw"},"schema":"pubphys.envelope/1"},"record_hash":"4c9cc880b6f60c03c3f3e21217672c535588e63a91d06eb37e6fdf8b3911b5bb","leaf_index":2810}