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説明:

Quantum Hall effect (QHE) has been the ground to construct modern conceptual electronic systems with emerging physics including topo- logical superconductor and quantum information processing. It is known that the QHE is often much influenced by the interplay between the host two dimensional electron gases and the substrate, sometimes predicted to exhibit exotic topological states such as quantum anoma- lous Hall. Yet the understanding of the underlying physics and controllable engineering of this paradigm of interaction remain challenging. Here we demonstrate the observation of a distinct QHE, which differs markedly from the known picture, in graphene samples in contact with an anti- ferromagnetic insulator CrOCl. Owing to the interfacial charge transfer, Landau levels in monolayer graphene remain intact at negative filling fractions, but largely distorted from the original fan-like pattern at a positive total electron doping. In this regime of doping, the consequential Landau quantization follows a parabolic relation between the displacement field D and the magnetic field B, with the QHE phase reaching the limit of zero magnetic field, and prevails up to 100 K in a wide doping range from 0 to 10^13 cm−2. This robust QHE phase opens up new routes for manipulating the quantum electronic states, which may find applications in such as quantum meteorology as well as topological superconductivity.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Quantum Hall effect, interfacial coupling, CrOCl

刊行年月日: 2022-11-21

出版者: Springer Science and Business Media LLC

掲載誌:

• Nature Nanotechnology (ISSN: 17483395) vol. 17 issue. 12 p. 1272-1279

研究助成金:

原稿種別: 出版者版 (Version of record)

MDR DOI:

公開URL: https://doi.org/10.1038/s41565-022-01248-4

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更新時刻: 2025-03-01 12:30:17 +0900

MDRでの公開時刻: 2025-03-01 12:30:17 +0900