AWhat changed
Fei, Palomaki and colleagues measured monolayer WTe₂ devices and found edge-dominated conduction as the interior became insulating below roughly 100 K. Nonlocal measurements and grounded pincer contacts separated edge and bulk conduction, while an in-plane magnetic field suppressed the edge response. Bilayer devices offered a comparison. A later microwave impedance microscopy study mapped enhanced conductivity along physical edges and additional internal lines in separate monolayer samples.
Scientific scope
Fei, Palomaki and colleagues measured monolayer WTe₂ devices and found edge-dominated conduction as the interior became insulating below roughly 100 K. Nonlocal measurements and grounded pincer contacts separated edge and bulk conduction, while an in-plane magnetic field suppressed the edge response. Bilayer devices offered a comparison. A later microwave impedance microscopy study mapped enhanced conductivity along physical edges and additional internal lines in separate monolayer samples. The 2016 v1 reports individual measured edge conductances below the ideal e²/h, reaching about half that value in its short-edge comparison. It interprets these and magnetic-field effects as consistent with helical topological edge transport rather than directly measuring spin polarization. The bulk transition mechanism and detailed scattering remain unresolved. The later Wu–Fatemi work uses different devices and a shorter locally gated channel to approach quantization; it is not the same dataset. This record describes the v1 preprint; the 2017 published version may differ. The later imaging is local microwave admittance, not direct spin polarization imaging or a replay of the earlier devices. Its interpretation uses finite-element response models; conducting internal lines and rings are interpreted as cracks or material boundaries, with contact and oxidation effects considered. Edge signal remains visible in one illustrated sample at 100 K, not a universal transition. The cited nine-page 2018 author version is accompanied by separate supplementary material. Its distinct twelve-author team is attributed to this follow-up alone.
Evidence
The linked original works support the scoped statement and contribution attribution. WRS has not independently replayed experiments or reconstructed a full mathematical proof. The 2016 v1 reports individual measured edge conductances below the ideal e²/h, reaching about half that value in its short-edge comparison. It interprets these and magnetic-field effects as consistent with helical topological edge transport rather than directly measuring spin polarization. The bulk transition mechanism and detailed scattering remain unresolved. The later Wu–Fatemi work uses different devices and a shorter locally gated channel to approach quantization; it is not the same dataset. This record describes the v1 preprint; the 2017 published version may differ. The later imaging is local microwave admittance, not direct spin polarization imaging or a replay of the earlier devices. Its interpretation uses finite-element response models; conducting internal lines and rings are interpreted as cracks or material boundaries, with contact and oxidation effects considered. Edge signal remains visible in one illustrated sample at 100 K, not a universal transition. The cited nine-page 2018 author version is accompanied by separate supplementary material. Its distinct twelve-author team is attributed to this follow-up alone.
Contributors
- The named authors in the research record · SCIENCE: These are the listed authors of the cited contribution sources. Paper authorship does not quantify individual effort. An incomplete list is explicitly marked; same names are not automatically merged.
Provisional WRS assessment, edition 2026-10-28.1. Independent expert calibration is pending. This grade does not certify correctness or assign ownership.
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