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Incommensurate charge super-modulation and hidden dipole order in layered kitaev material α-RuCl3

Author

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  • Xiaohu Zheng

    (Beijing Academy of Quantum Information Sciences)

  • Zheng-Xin Liu

    (Renmin University of China
    Renmin University of China)

  • Cuiwei Zhang

    (Chinese Academy of Sciences)

  • Huaxue Zhou

    (Beijing Academy of Quantum Information Sciences)

  • Chongli Yang

    (Beijing Academy of Quantum Information Sciences)

  • Youguo Shi

    (Chinese Academy of Sciences)

  • Katsumi Tanigaki

    (Beijing Academy of Quantum Information Sciences)

  • Rui-Rui Du

    (Peking University
    University of Chinese Academy of Sciences
    Hefei National Laboratory)

Abstract

The magnetism of Kitaev materials has been widely studied, but their charge properties and the coupling to other degrees of freedom are less known. Here we investigate the charge states of α-RuCl3, a promising Kitaev quantum spin liquid candidate, in proximity to graphite. We discover that few-layered α-RuCl3 experiences a clear modulation of charge states, where a Mott-insulator to weak charge-transfer-insulator transition in the 2D limit occurs by means of heterointerfacial polarization. More notably, distinct signals of incommensurate charge and lattice super-modulations, regarded as an unconventional charge order, accompanied in the insulator. Our theoretical calculations have reproduced the incommensurate charge order by taking into account the antiferroelectricity of α-RuCl3 that is driven by dipole order in the internal electric fields. The findings imply that there is strong coupling between the charge, spin, and lattice degrees of freedom in layered α-RuCl3 in the heterostructure, which offers an opportunity to electrically access and tune its magnetic interactions inside the Kitaev compounds.

Suggested Citation

  • Xiaohu Zheng & Zheng-Xin Liu & Cuiwei Zhang & Huaxue Zhou & Chongli Yang & Youguo Shi & Katsumi Tanigaki & Rui-Rui Du, 2024. "Incommensurate charge super-modulation and hidden dipole order in layered kitaev material α-RuCl3," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-52019-9
    DOI: 10.1038/s41467-024-52019-9
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    References listed on IDEAS

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    1. Leon Balents, 2010. "Spin liquids in frustrated magnets," Nature, Nature, vol. 464(7286), pages 199-208, March.
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