Evidence for an exotic form of the Kondo effect has been obtained by placing magnetic atoms on single-layer 1T-TaSe2, which is a quantum spin liquid candidate. Unlike conventional Kondo screening, which arises from conduction electrons in a metal, the Kondo effect in 1T-TaSe2 arises from charge-neutral particles known as spinons.
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References
Savary, L. & Balents, L. Quantum spin liquids: a review. Rep. Prog. Phys. 80, 016502 (2016). A review article that presents general aspects of quantum spin liquids.
Ribeiro, P. & Lee, P. A. Magnetic impurity in a U(1) spin liquid with a spinon Fermi surface. Phys. Rev. B 83, 235119 (2011). This paper reports an early theoretical prediction of the spinon Kondo effect.
Gomilšek, M. et al. Kondo screening in a charge-insulating spinon metal. Nat. Phys. 15, 754–758 (2019). This paper reports muon spin-based evidence for Kondo screening of magnetic moments for impurities in another gapless QSL candidate.
Chen, Y. et al. Strong correlations and orbital texture in single-layer 1T-TaSe2. Nat. Phys. 16, 218–224 (2020). This paper reports Mott insulator behaviour and Hubbard band splitting in single-layer 1T-TaSe2.
Ruan, W. et al. Evidence for quantum spin liquid behaviour in single-layer 1T-TaSe2 from scanning tunnelling microscopy. Nat. Phys. 17, 1154–1161 (2021). This paper reports real-space modulations of the local density of states of single-layer 1T-TaSe2 that are consistent with an instability in a half-filled QSL spinon Fermi-surface.
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This is a summary of: Chen, Y. et al. Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe2. Nat. Phys. https://doi.org/10.1038/s41567-022-01751-4 (2022).
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Exotic Kondo effect induced by spinons in a quantum spin liquid. Nat. Phys. 18, 1283–1284 (2022). https://doi.org/10.1038/s41567-022-01752-3
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DOI: https://doi.org/10.1038/s41567-022-01752-3
