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(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 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