TY - JOUR
T1 - Kondo effect and spin–orbit coupling in graphene quantum dots
AU - Kurzmann, Annika
AU - Kleeorin, Yaakov
AU - Tong, Chuyao
AU - Garreis, Rebekka
AU - Knothe, Angelika
AU - Eich, Marius
AU - Mittag, Christopher
AU - Gold, Carolin
AU - de Vries, Folkert Kornelis
AU - Watanabe, Kenji
AU - Taniguchi, Takashi
AU - Fal’ko, Vladimir
AU - Meir, Yigal
AU - Ihn, Thomas
AU - Ensslin, Klaus
N1 - Funding Information:
We thank Peter Märki, Thomas Bähler as well as the staff of the ETH cleanroom facility FIRST for their technical support. We also acknowledge financial support by the European Graphene Flagship and the ERC Syngery Grant Quantropy. Growth of hexagonal boron nitride crystals was supported by the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Numbers JPMXP0112101001, JSPS KAKENHI Grant Number JP20H00354 and the CREST(JPMJCR15F3), J.S.T. We acknowledge funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 766025. YM acknowledges the support of the Israel Science Foundation (grant no. 359/20). F.K.d.V acknowledges support from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 862660/QUANTUM E LEAPS.
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85117419212&partnerID=8YFLogxK
U2 - 10.1038/s41467-021-26149-3
DO - 10.1038/s41467-021-26149-3
M3 - Article
C2 - 34650056
AN - SCOPUS:85117419212
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 6004
ER -