{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"735cd461969187b65a5476a37f49a1085b47cad4ce872e0ba9aab633488cae88","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["355a05d06221cdd217d9ce6a2f32abf9a59ab515f514f1908961cf5d6771e61e","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"aafe604a6b13c98ef67bf2f63d109494606357fe23007b505838c52beebe05f8","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.strange-metals.quasiparticle-charge","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"Shot noise, the current fluctuation caused by charge arriving in discrete packets, reveals whether current is carried by electron-like particles; in one strange metal the noise was far smaller than expected.","posed_since":"2023","precise":"Measure the Fano factor $F = S_I/(2 e I)$ in mesoscopic wires of strange metals in the $T$-linear regime and determine whether suppression of $F$ below the Fermi-liquid values ($1/3$ for elastic diffusive transport, $\\sqrt{3}/4$ for hot electrons) reflects the absence of quasiparticles or electron-phonon energy relaxation. An answer is a cross-material data set with independently measured electron-phonon length plus a theory of shot noise without quasiparticles that matches it.","problem_ref":"355a05d06221cdd217d9ce6a2f32abf9a59ab515f514f1908961cf5d6771e61e","references":"","settled_by":"Length- and temperature-dependent shot-noise measurements in at least two strange-metal families with control wires of a conventional metal in the same geometry.","status_note":"Strongly suppressed shot noise was reported in $\\mathrm{YbRh_2Si_2}$ nanowires in 2023; whether electron-phonon relaxation can explain it is debated.","title":"Do strange metals carry current in electron-like quasiparticles?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"7857466e3477f89457e80ca2d6bbacb6bf3009c53f698de848b9b3b2a2734d28","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"df608fac19c20a78fe750e8c992fd867e3f24db1f680b1043d1967ea6e1a1fd5","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"RMuq6xTriC3e3GQyCwGwJfPyRBtlzBgZLUAAQsirEns6jYkrVBapvXaph9UuNfVHGwQ5mERQbm41oqeBNFFtCQ"},"schema":"pubphys.envelope/1"},"record_hash":"7857466e3477f89457e80ca2d6bbacb6bf3009c53f698de848b9b3b2a2734d28","leaf_index":3064}