Upon decreasing the electron density in a two-dimensional electronic system to a critical value, a transition should occur from a quantum to a classical regime. An oxide now shows electrical properties marking such a transition.
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Ashoori, R. A long-sought regime of electronic behaviour. Nat. Mater. 21, 268–269 (2022). https://doi.org/10.1038/s41563-022-01212-6
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DOI: https://doi.org/10.1038/s41563-022-01212-6