{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"c715a6095305f020b60c38a797ba0656f4758b1ebeeefc82baa6d8c1dcf0de67","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b","f607d09c411d501349043a171086afd8d65d4d3c6fa57df7de567f1ea131efb4"],"salt":"94afa8583d82ce45de5e265703af2d12ebbe0980fbdd319627a936742bfa5267","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"identification","assisted_by":[],"external_id":"cm.weyl-semimetals.zrte5-hall-plateaus","kind":"well-posed","literature_status":"contested","n":"2","parents":[],"plain":"Thick crystals of $\\mathrm{ZrTe_5}$ show Hall-resistance plateaus resembling the quantum Hall effect, which normally needs a two-dimensional sample, and whether a field-induced charge-density wave causes them is unsettled.","posed_since":"2019","precise":"In bulk $\\mathrm{ZrTe_5}$ (and $\\mathrm{HfTe_5}$), Tang et al. (Nature, 2019) reported Hall plateaus with $\\rho_{xy}\\sim (1/2)(h/e^2)\\lambda_z$, $\\lambda_z$ the Fermi wavelength along the field, attributed to a field-induced charge-density wave in the quantum limit. Determine whether a density modulation and gap exist or whether the plateau-like features come from quantum-limit band physics alone. An answer is an identification backed by direct structural or spectroscopic evidence.","problem_ref":"f607d09c411d501349043a171086afd8d65d4d3c6fa57df7de567f1ea131efb4","references":"","settled_by":"X-ray diffraction or ultrasound in the quantum limit detecting or excluding a density modulation with wavelength $\\sim \\lambda_z/2$, with transport on the same samples.","status_note":"Thermodynamic and transport studies from 2021 argued the plateaus arise without a charge-density wave; no direct structural detection as of 2026.","title":"Origin of Hall plateaus in bulk $\\mathrm{ZrTe_5}$","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"eec2d228a98a487294ff860a78c1b11dafb0eda63f63101fc77145b7cffa7c37","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"97b32d4462a99a1395de5751099c6ad2b81bf6db432deb929bb2480531573aa7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"V-5pv6vRxPmzjAdHqjlragN70_vCKLF8Eg4_BMcVSmnIRz0nkj1M07oIH721XlH5Mkt5Q8HOrpF3bqBCNPjfBw"},"schema":"pubphys.envelope/1"},"record_hash":"eec2d228a98a487294ff860a78c1b11dafb0eda63f63101fc77145b7cffa7c37","leaf_index":3104}