A layer-by-layer study of TaSe2 shows how this material becomes increasingly insulating as it thins to a monolayer. Scanning tunnelling microscopy reveals the electronic correlations underlying this insulator with atomic resolution.
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Franke, K.J., von Oppen, F. Correlated insulator by the slice. Nat. Phys. 16, 128–129 (2020). https://doi.org/10.1038/s41567-019-0760-9
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DOI: https://doi.org/10.1038/s41567-019-0760-9