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Kondo effect and spin–orbit coupling in graphene quantum dots

Author

Listed:
  • Annika Kurzmann

    (ETH Zürich)

  • Yaakov Kleeorin

    (University of Chicago)

  • Chuyao Tong

    (ETH Zürich)

  • Rebekka Garreis

    (ETH Zürich)

  • Angelika Knothe

    (University of Manchester)

  • Marius Eich

    (ETH Zürich)

  • Christopher Mittag

    (ETH Zürich)

  • Carolin Gold

    (ETH Zürich)

  • Folkert Kornelis Vries

    (ETH Zürich)

  • Kenji Watanabe

    (National Institute for Materials Science)

  • Takashi Taniguchi

    (National Institute for Materials Science)

  • Vladimir Fal’ko

    (University of Manchester)

  • Yigal Meir

    (Ben-Gurion University of the Negev)

  • Thomas Ihn

    (ETH Zürich
    ETH Zurich)

  • Klaus Ensslin

    (ETH Zürich
    ETH Zurich)

Abstract

The Kondo effect is a cornerstone in the study of strongly correlated fermions. The coherent exchange coupling of conduction electrons to local magnetic moments gives rise to a Kondo cloud that screens the impurity spin. Here we report on the interplay between spin–orbit interaction and the Kondo effect, that can lead to a underscreened Kondo effects in quantum dots in bilayer graphene. More generally, we introduce a different experimental platform for studying Kondo physics. In contrast to carbon nanotubes, where nanotube chirality determines spin–orbit coupling breaking the SU(4) symmetry of the electronic states relevant for the Kondo effect, we study a planar carbon material where a small spin–orbit coupling of nominally flat graphene is enhanced by zero-point out-of-plane phonons. The resulting two-electron triplet ground state in bilayer graphene dots provides a route to exploring the Kondo effect with a small spin–orbit interaction.

Suggested Citation

  • Annika Kurzmann & Yaakov Kleeorin & Chuyao Tong & Rebekka Garreis & Angelika Knothe & Marius Eich & Christopher Mittag & Carolin Gold & Folkert Kornelis Vries & Kenji Watanabe & Takashi Taniguchi & Vl, 2021. "Kondo effect and spin–orbit coupling in graphene quantum dots," Nature Communications, Nature, vol. 12(1), pages 1-6, December.
    • Handle: RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26149-3
    DOI: 10.1038/s41467-021-26149-3
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    References listed on IDEAS

    as
    1. D. Goldhaber-Gordon & Hadas Shtrikman & D. Mahalu & David Abusch-Magder & U. Meirav & M. A. Kastner, 1998. "Kondo effect in a single-electron transistor," Nature, Nature, vol. 391(6663), pages 156-159, January.
    2. Jesper Nygård & David Henry Cobden & Poul Erik Lindelof, 2000. "Kondo physics in carbon nanotubes," Nature, Nature, vol. 408(6810), pages 342-346, November.
    3. F. Kuemmeth & S. Ilani & D. C. Ralph & P. L. McEuen, 2008. "Coupling of spin and orbital motion of electrons in carbon nanotubes," Nature, Nature, vol. 452(7186), pages 448-452, March.
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    Cited by:

    1. K. Hecker & L. Banszerus & A. Schäpers & S. Möller & A. Peters & E. Icking & K. Watanabe & T. Taniguchi & C. Volk & C. Stampfer, 2023. "Coherent charge oscillations in a bilayer graphene double quantum dot," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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