AWhat changed
Ghiotto, Wei, Song and colleagues mapped longitudinal and Hall transport in a 4.2-degree twisted bilayer WSe2 device. They found an enhanced low-field Hall response away from exact half filling, consistent with reconstructed small Fermi pockets. Near one hole per moiré cell, a low-field correlated insulator gave way to metallic transport around 5 T and a second insulating region above about 24 T. Temperature dependence, Hall sign changes and Landau-level trajectories motivated interpretations in terms of antiferromagnetic reconstruction and a high-field Ising excitonic insulator.
Scientific scope
Ghiotto, Wei, Song and colleagues mapped longitudinal and Hall transport in a 4.2-degree twisted bilayer WSe2 device. They found an enhanced low-field Hall response away from exact half filling, consistent with reconstructed small Fermi pockets. Near one hole per moiré cell, a low-field correlated insulator gave way to metallic transport around 5 T and a second insulating region above about 24 T. Temperature dependence, Hall sign changes and Landau-level trajectories motivated interpretations in terms of antiferromagnetic reconstruction and a high-field Ising excitonic insulator. The observed contributions are finite-device transport patterns and fitted activation scales. Antiferromagnetic order, spin-density-wave structure and electron-hole binding are theoretical interpretations rather than direct measurements of the microscopic order. High-field Hall plateaus do not by themselves establish an exciton condensate, superfluidity or a uniquely identified topological excitonic phase. The entry follows the May 2024 preprint, including its two supplementary figures.
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 observed contributions are finite-device transport patterns and fitted activation scales. Antiferromagnetic order, spin-density-wave structure and electron-hole binding are theoretical interpretations rather than direct measurements of the microscopic order. High-field Hall plateaus do not by themselves establish an exciton condensate, superfluidity or a uniquely identified topological excitonic phase. The entry follows the May 2024 preprint, including its two supplementary figures.
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.
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