{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"f56847532ee1ed40f8ad0fb92b6318c3d38bf15ed9b4c5082f59105db1830c44","created":"2026-10-03T07:18:01Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"6ef87a71759fc3eb925e11577efb504cd90787d53870c94aa9d35741d67f30c7","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"yes-no","assisted_by":[],"external_id":"cm.weyl-semimetals.quantized-cpge","kind":"well-posed","literature_status":"contested","n":"1","parents":[],"plain":"In chiral crystals such as RhSi and CoSi, circularly polarized light should drive a current whose growth rate equals a whole number (a topological charge) times fundamental constants, and this quantization has not been confirmed.","posed_since":"2017","precise":"For chiral multifold semimetals (RhSi, CoSi, PdGa), the trace of the circular photogalvanic injection tensor is predicted to be quantized, $\\operatorname{tr}\\beta = i \\pi e^3 C / h^2$ with $C$ the Chern number of the Fermi surface around the multifold node, within the frequency window where only transitions near that node are allowed. Determine whether such a plateau exists experimentally and to what accuracy. An answer is the measured $\\operatorname{tr}\\beta$ in units of $\\pi e^3/h^2$ with error over the predicted window.","problem_ref":null,"references":"","settled_by":"Broadband, absolutely calibrated terahertz-emission or photocurrent measurements showing a frequency-independent plateau at the quantized value.","status_note":"RhSi data (Rees et al. 2020) agree with the predicted magnitude in a window below 0.65 eV, but a plateau at the quantized value with stated accuracy is not established, and interaction corrections are predicted, as of 2026.","title":"Quantized circular photogalvanic effect in chiral multifold semimetals","topic_ref":"2be8f71440ef80a2f6a5c39e87f067e4bb75be81175ba895e94387a2b67affde"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"bc180bb7917c3f609d18c8c4ff6e7a43d87cad6e4f9808d9c0e643217ae4c885","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"0dd789431aab66d82edffa3027b37c9847ee623581efd1039ad1c2c757912a58","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"40lsoDHHjaqeCgfzbD3T4y43sHbcBM2LHLIOh2HISk_IcLMjclSmmr16DqB2JmYlMNDQ_wxc40oX7FLY72EyCQ"},"schema":"pubphys.envelope/1"},"record_hash":"bc180bb7917c3f609d18c8c4ff6e7a43d87cad6e4f9808d9c0e643217ae4c885","leaf_index":1216}