Emergent Coherent Lattice Behavior in Kondo Nanosystems

Abstract

How many magnetic moments periodically arranged on a metallic surface are needed to generate a coherent Kondo lattice behavior? We investigate this fundamental issue within the particle-hole symmetric Kondo lattice model using quantum Monte Carlo simulations. Extra magnetic atoms forming closed shells around the initial impurity induce a fast splitting of the Kondo resonance at the inner shells which signals the formation of composite heavy-fermion bands. The onset of the hybridization gap matches well the enhancement of antiferromagnetic spin correlations in the plane perpendicular to the applied magnetic field, a genuine feature of the coherent Kondo lattice. In contrast, the outermost shell remains dominated by a local Kondo physics with spectral features resembling the single-impurity behavior.

4+ pages plus supplemental material; published version

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• Exploring the Kondo effect of an extended impurity with chains of Co adatoms in a magnetic field
• Coherence Temperature in the Diluted Periodic Anderson Model
• Breakdown of heavy quasiparticles in a honeycomb Kondo lattice: A quantum Monte Carlo study
• Artificially built Kondo chains with organic radicals on metallic surfaces: new model system of heavy fermion quantum criticality
• Matrix Product Study of Spin Fractionalization in the 1D Kondo Insulator
• Structural and electrical characterization of the monolayer Kondo-lattice compound CePt${}_6$/Pt(111)
• An emerging global picture of heavy fermion physics
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• The ALF (Algorithms for Lattice Fermions) project release 2.4. Documentation for the auxiliary-field quantum Monte Carlo code
• Spin fractionalization in a Kondo-lattice superconductor heterostructure
• SU($\mathbf{N}$) Kondo-Heisenberg chain: Phase diagram, Ising criticality, and the coexistence of heavy quasiparticles and valence bond solid order
• Tunable magnetism of a hexagonal Anderson droplet on the triangular lattice
• Phases and phase transitions of an $S=3/2$ chain on metallic and semi-metallic surfaces
• Spectral properties of strongly correlated multi impurity models in the Kondo insulator regime: Emergent coherence, metallic surface states and quantum phase transitions