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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.

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• Creative Commons BY Attribution 4.0 International
  

Keyword: Quantum Hall effect, interfacial coupling, CrOCl

Date published: 2022-11-21

Publisher: Springer Science and Business Media LLC

Journal:

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

Funding:

Manuscript type: Publisher's version (Version of record)

MDR DOI:

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

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Updated at: 2025-03-01 12:30:17 +0900

Published on MDR: 2025-03-01 12:30:17 +0900