Ferromagnetic kondo effect in a triple quantum dot system

P. P. Baruselli*, R. Requist, M. Fabrizio, E. Tosatti

*Corresponding author for this work

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A simple device of three laterally coupled quantum dots, the central one contacted by metal leads, provides a realization of the ferromagnetic Kondo model, which is characterized by interesting properties like a nonanalytic inverted zero-bias anomaly and an extreme sensitivity to a magnetic field. Tuning the gate voltages of the lateral dots allows us to study the transition from a ferromagnetic to antiferromagnetic Kondo effect, a simple case of a Berezinskii-Kosterlitz-Thouless transition. We model the device by three coupled Anderson impurities that we study by numerical renormalization group. We calculate the single-particle spectral function of the central dot, which at zero frequency is proportional to the zero-bias conductance, across the transition, both in the absence and in the presence of a magnetic field.

Original languageAmerican English
Article number047201
JournalPhysical Review Letters
Issue number4
StatePublished - 23 Jul 2013
Externally publishedYes


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