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How many magnetic moments periodically arranged on a metallic surface areneeded to generate a coherent Kondo lattice behavior? We investigate thisfundamental issue within the particle-hole symmetric Kondo lattice model usingquantum Monte Carlo simulations. Extra magnetic atoms forming closed shellsaround the initial impurity induce a fast splitting of the Kondo resonance atthe inner shells which signals the formation of composite heavy-fermion bands.The onset of the hybridization gap matches well the enhancement ofantiferromagnetic spin correlations in the plane perpendicular to the appliedmagnetic field, a genuine feature of the coherent Kondo lattice. In contrast,the outermost shell remains dominated by a local Kondo physics with spectralfeatures resembling the single-impurity behavior.

Emergent Coherent Lattice Behavior in Kondo Nanosystems