Journal
NATURE COMMUNICATIONS
Volume 12, Issue 1, Pages -Publisher
NATURE PORTFOLIO
DOI: 10.1038/s41467-021-26149-3
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Funding
- European Graphene Flagship
- ERC Syngery Grant Quantropy
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, J.S.T [JPMJCR15F3]
- European Union's Horizon 2020 research and innovation program under the Marie Skodowska-Curie Grant [766025]
- Israel Science Foundation [359/20]
- European Union [862660/QUANTUM E LEAPS]
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The study explores the interplay between spin-orbit interaction and the Kondo effect, revealing the possibility of underscreened Kondo effects in bilayer graphene quantum dots. Unlike carbon nanotubes, a different experimental platform is employed to investigate Kondo physics in a planar carbon material.
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.
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