Kondo effect and spin–orbit coupling in graphene quantum dots

Annika Kurzmann (), Yaakov Kleeorin, Chuyao Tong, Rebekka Garreis, Angelika Knothe, Marius Eich, Christopher Mittag, Carolin Gold, Folkert Kornelis Vries, Kenji Watanabe, Takashi Taniguchi, Vladimir Fal’ko, Yigal Meir, Thomas Ihn and Klaus Ensslin
Additional contact information
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
Klaus Ensslin: ETH Zürich

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: 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.

Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:12:y:2021:i:1:d:10.1038_s41467-021-26149-3

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DOI: 10.1038/s41467-021-26149-3

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