The Kondo Effect in the Presence of Magnetic Impurities

Abstract

We measure transport through gold grain quantum dots fabricated using electromigration, with magnetic impurities in the leads. A Kondo interaction is observed between dot and leads, but the presence of magnetic impurities results in a gate-dependent zero-bias conductance peak that is split due to an RKKY interaction between the spin of the dot and the static spins of the impurities. A magnetic field restores the single Kondo peak in the case of an antiferromagnetic RKKY interaction. This system provides a new platform to study Kondo and RKKY interactions in metals at the level of a single spin.

arXiv comment5 pages, 4 figures

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• Two-dimensional simulations of temperature and current-density distribution in electromigrated structures
• Numerical study of finite size effects in the one-dimensional two-impurity Anderson model
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• Spin and Charge Control of Topological End States in Chiral Graphene Nanoribbons on a 2D Ferromagnet
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• Non-equilibrium Scaling Properties of a Double Quantum Dot System: Comparison between Perturbative Renormalization Group and Flow Equation Approach
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