Article Optical Sensing of Fractional Quantum Hall Effect in Graphene

Alexander Popert ; Yuya Shimazaki ; Martin Kroner ; Kenji Watanabe SAMURAI ORCID (National Institute for Materials ScienceROR) ; Takashi Taniguchi SAMURAI ORCID (National Institute for Materials ScienceROR) ; Ataç Imamoğlu ; Tomasz Smoleński

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Alexander Popert, Yuya Shimazaki, Martin Kroner, Kenji Watanabe, Takashi Taniguchi, Ataç Imamoğlu, Tomasz Smoleński. Optical Sensing of Fractional Quantum Hall Effect in Graphene. Nano Letters. 2022, 22 (18), 7363-7369. https://doi.org/10.1021/acs.nanolett.2c02000
SAMURAI

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(abstract)

Graphene and its van der Waals (vdW) heterostructures provide a unique and versatile playground for explorations of strongly correlated electronic phases, ranging from unconventional fractional Quantum Hall states (FQH) in a monolayer system to a plethora of superconducting and insulating states in twisted bilayers. However, the access to those fascinating phases has been thus far entirely restricted to transport techniques, due to the lack of a robust energy bandgap that makes graphene hard to access optically. Here we demonstrate an all-optical, non-invasive spectroscopic tool for probing electronic correlations in graphene using excited Rydberg excitons in an adjacent transition metal dichalcogenide monolayer. Due to their large Bohr radii, Rydberg states are highly susceptible to the compressibility of graphene electrons, allowing us to detect the formation of odd-denominator FQH states at high magnetic fields. Owing to its sub-micron spatial resolution, the technique we demonstrate circumvents spatial inhomogeneities in vdW structures, and paves the way for optical studies of correlated states in twisted bilayer graphene and other optically inactive atomically-thin materials.

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Keyword: Graphene, fractional quantum Hall, Rydberg excitons

Date published: 2022-09-28

Publisher: American Chemical Society (ACS)

Journal:

  • Nano Letters (ISSN: 15306984) vol. 22 issue. 18 p. 7363-7369

Funding:

  • Ministry of Education, Culture, Sports, Science and Technology JPMXP0112101001
  • Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 200021-204076
  • Schweizerischer Nationalfonds zur F?rderung der Wissenschaftlichen Forschung 51NF40-185902
  • Japan Society for the Promotion of Science 19H05790
  • Japan Society for the Promotion of Science JP20H00354

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

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First published URL: https://doi.org/10.1021/acs.nanolett.2c02000

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Updated at: 2025-02-23 22:51:13 +0900

Published on MDR: 2025-02-23 22:51:13 +0900

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