Role of the surface state in the Kondo resonance width of a Co single adatom on Ag(111)

Li, Q. L.; Zheng, Cheng; Wang, R.; Miao, B. F.; Cao, Rongxing; Sun, L. Z.; Wu, Di; Wu, Y. Z.; Li, S. C.; Wang, B. G.; Ding, Haifeng

doi:10.1103/physrevb.97.035417

Cited by 22 publications

(16 citation statements)

References 57 publications

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“…Hence, the presence of edge lobes is a fingerprint of the D = 2 character of the conduction band, which suggests that the 2D Shockley surface state governs the substrate-mediated impurity hybridization. This is in agreement with recent experimental and theoretical studies demonstrating that the surface state plays a primary role in the Kondo effect of Co/Ag(111) 20,42 .…”

Section: Resultssupporting

confidence: 93%

Real space manifestations of coherent screening in atomic scale Kondo lattices

et al. 2019

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The interaction among magnetic moments screened by conduction electrons drives quantum phase transitions between magnetically ordered and heavy-fermion ground states. Here, starting from isolated magnetic impurities in the Kondo regime, we investigate the formation of the finite size analogue of a heavy Fermi liquid. We build regularly-spaced chains of Co adatoms on a metallic surface by atomic manipulation. Scanning tunneling spectroscopy is used to obtain maps of the Kondo resonance intensity with sub-atomic resolution. For sufficiently small interatomic separation, the spatial distribution of Kondo screening does not coincide with the position of the adatoms. It also develops enhancements at both edges of the chains. Since we can rule out any other interaction between Kondo impurities, this is explained in terms of the indirect hybridization of the Kondo orbitals mediated by a coherent electron gas, the mechanism that causes the emergence of heavy quasiparticles in the thermodynamic limit.

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Section: Resultssupporting

confidence: 93%

Real space manifestations of coherent screening in atomic scale Kondo lattices

et al. 2019

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“…Moreover, the rather high T K ∼ 180 K of a Co porphirine on ( √ 3 × √ 3)Ag-Si(111), where bulk electrons states are not present, indicates that a significant coupling between the surface states and magnetic impurity is possible 34 . In support of this, it has been recently shown that dI/dV of Ag(111) oscillates as the resonance width of Co atoms near step edges, quantum resonators or another atom 35 . It is worth noting that, from the theoretical point of view, the Kondo effect is extremely sensitive to the hybridiza-tion channels between the impurity and the metal host electrons, which exhibit non-trivial dependencies on the k-space electronic structure of the surface and the actual adsorption geometry 36 .…”

Section: Introductionmentioning

confidence: 84%

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

et al. 2018

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Using a combination of scanning tunneling spectroscopy and atomic lateral manipulation, we obtained a systematic variation of the Kondo temperature (TK) 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 (ρs). By sampling the TK of a Co atom on positions where ρs 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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“…In addition, a Co porphyrin molecule adsorbed on a Si(111)-√ 3 × √ 3 Ag substrate, which does not have bulk states close to the Fermi level, evidences the surface states contribution to the Kondo resonance in this tailored system [27]. Measurements of Co adatoms on Ag (111) showed that the Kondo temperature can be tuned by confining the surface states, evidencing once more their importance [6,28]. Also with a Ag(111) substrate, terraces of different widths were used to shift the surface state band onset above the Fermi level [29].…”

Section: Introductionmentioning

confidence: 91%

Surface states influence in the conductance spectra of Co adsorbed on Cu(111)

Tacca,

Jacob,

Goldberg

2021

Preprint

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We calculate the conductance spectra of a Co atom adsorbed on Cu(111), considering the Co 3d orbitals within a correlated multiple configurations model interacting through the substrate band with the Co 4s orbital, which is treated in a mean-field like approximation. By symmetry, only the d z 2 orbital couples with the s orbital through the Cu bands, and the interference between both conduction channels introduces a zero-bias anomaly in the conductance spectra. We find that, while the Kondo resonance is mainly determined by the interaction of the Co d orbitals with the bulk states of the Cu(111) surface, a proper description of the contribution given by the coupling with the localized surface states to the Anderson widths is crucial to describe the interference line shape. We find that the coupling of the Co 4s orbital with the Shockley surface states is responsible of two main features observed in the measured conductance spectra, the dip shape around the Fermi energy and the resonance structure at the surface state low band edge.

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Role of the surface state in the Kondo resonance width of a Co single adatom on Ag(111)

Cited by 22 publications

References 57 publications

Real space manifestations of coherent screening in atomic scale Kondo lattices

Real space manifestations of coherent screening in atomic scale Kondo lattices

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

Surface states influence in the conductance spectra of Co adsorbed on Cu(111)

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