Kondo effect and spin-orbit coupling in graphene quantum dots
arXiv:2103.04864 · doi:10.1038/s41467-021-26149-3
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. Whereas complete Kondo screening has been explored widely, realizations of the underscreened scenario - where only some of several Kondo channels participate in the screening - remain rare. Here we report the observation of fully screened and underscreened Kondo effects in quantum dots in bilayer graphene. More generally, we introduce a unique platform for studying Kondo physics. In contrast to carbon nanotubes, whose curved surfaces give rise to strong spin-orbit coupling breaking the SU(4) symmetry of the electronic states relevant for the Kondo effect, we study a nominally flat carbon material with small spin-orbit coupling. Moreover, the unusual two-electron triplet ground state in bilayer graphene dots provides a route to exploring the underscreened spin-1 Kondo effect.
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Cited by in corpus (10)
- Universal Prony fitting decomposition for optimized hierarchical quantum master equations
- Spin relaxation in a single-electron graphene quantum dot
- Particle-hole symmetry protects spin-valley blockade in graphene quantum dots
- Single-shot readout in graphene quantum dots
- Pauli Blockade of Tunable Two-Electron Spin and Valley States in Graphene Quantum Dots
- Theory of tunneling spectra for a few-electron bilayer graphene quantum dot
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- Spin-valley locked excited states spectroscopy in a one-particle bilayer graphene quantum dot
- Temperature Dependent Zero-Field Splittings in Graphene
- Three-carrier spin blockade and coupling in bilayer graphene double quantum dots