Quantifying the leading role of the surface state in the Kondo effect of Co/Ag(111)

Abstract

Using a combination of scanning tunneling spectroscopy and atomic lateral manipulation, we obtained a systematic variation of the Kondo temperature ($T_{\mathrm{K}}$) of Co atoms on Ag(111) as a function of the surface state contribution to the total density of states at the atom adsorption site (${\rho }_s$). By sampling the $T_{\mathrm{K}}$ of a Co atom on positions where ${\rho }_s$ was spatially resolved beforehand, we obtain a nearly linear relationship between both magnitudes. We interpret the data on the basis of an Anderson model including orbital and spin degrees of freedom (SU(4)) in good agreement with the experimental findings. The fact that the onset of the surface band is near the Fermi level is crucial to lead to the observed linear behavior. In the light of this model, the quantitative analysis of the experimental data evidences that at least a quarter of the coupling of Co impurities with extended states takes place through the hybridization to surface states. This result is of fundamental relevance in the understanding of Kondo screening of magnetic impurities on noble metal surfaces, where bulk and surface electronic states coexist.

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• Relation between width of the zero-bias anomaly and Kondo temperaure in transport measurements through correlated quantum dots: Effect of asymmetric coupling to the leads
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• Spin-resolved spectroscopic evidence for spinarons in Co adatoms
• Theory of differential conductance of Co on Cu(111) including Co s and d orbitals, and surface and bulk Cu states
• Surface states influence in the conductance spectra of Co adsorbed on Cu(111)
• Two-stage three-channel Kondo physics for an FePc molecule on the Au(111) surface
• Topological quantum phase transition in individual Fe Atoms on MoS${}_2$/Au(111)
• Tuning spinaron and Kondo resonances via quantum confinement
• Kondo physics of magnetic adatoms on metallic surfaces when the onset of the surface conduction density of states crosses the Fermi level
• Unraveling screening mechanisms in Kondo impurities using an NRG-MPS-based method