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Emergence of orbital angular moment at van Hove singularity in graphene/h-BN moiré superlattice

Author

Listed:
  • Rai Moriya

    (University of Tokyo)

  • Kei Kinoshita

    (University of Tokyo)

  • J. A. Crosse

    (New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (University of Tokyo
    National Institute for Materials Science)

  • Satoru Masubuchi

    (University of Tokyo)

  • Pilkyung Moon

    (New York University Shanghai and NYU-ECNU Institute of Physics at NYU Shanghai
    East China Normal University)

  • Mikito Koshino

    (Osaka University)

  • Tomoki Machida

    (University of Tokyo)

Abstract

Bloch electrons lacking inversion symmetry exhibit orbital magnetic moments owing to the rotation around their center of mass; this moment induces a valley splitting in a magnetic field. For the graphene/h-BN moiré superlattice, inversion symmetry is broken by the h-BN. The superlattice potential generates a series of Dirac points (DPs) and van Hove singularities (vHSs) within an experimentally accessible low energy state, providing a platform to study orbital moments with respect to band structure. In this work, theoretical calculations and magnetothermoelectric measurements are combined to reveal the emergence of an orbital magnetic moment at vHSs in graphene/h-BN moiré superlattices. The thermoelectric signal for the vHS at the low energy side of the hole-side secondary DP exhibited significant magnetic field-induced valley splitting with an effective g-factor of approximately 130; splitting for other vHSs was negligible. This was attributed to the emergence of an orbital magnetic moment at the second vHS at the hole-side.

Suggested Citation

  • Rai Moriya & Kei Kinoshita & J. A. Crosse & Kenji Watanabe & Takashi Taniguchi & Satoru Masubuchi & Pilkyung Moon & Mikito Koshino & Tomoki Machida, 2020. "Emergence of orbital angular moment at van Hove singularity in graphene/h-BN moiré superlattice," Nature Communications, Nature, vol. 11(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-19043-x
    DOI: 10.1038/s41467-020-19043-x
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    Cited by:

    1. Mohit Kumar Jat & Priya Tiwari & Robin Bajaj & Ishita Shitut & Shinjan Mandal & Kenji Watanabe & Takashi Taniguchi & H. R. Krishnamurthy & Manish Jain & Aveek Bid, 2024. "Higher order gaps in the renormalized band structure of doubly aligned hBN/bilayer graphene moiré superlattice," Nature Communications, Nature, vol. 15(1), pages 1-7, December.
    2. Jubin Nathawat & Ishiaka Mansaray & Kohei Sakanashi & Naoto Wada & Michael D. Randle & Shenchu Yin & Keke He & Nargess Arabchigavkani & Ripudaman Dixit & Bilal Barut & Miao Zhao & Harihara Ramamoorthy, 2023. "Signatures of hot carriers and hot phonons in the re-entrant metallic and semiconducting states of Moiré-gapped graphene," Nature Communications, Nature, vol. 14(1), pages 1-11, December.

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