Detection of Spin Reversal via Kondo Correlation in Hybrid Carbon Nanotube Quantum Dots

Abstract : We experimentally investigate the electronic transportthrough a double-wall carbon nanotubefilled with Fe nanoparticles. Atvery low temperatures, the Kondo effect is observed between theconfined electrons in the nanotube quantum dot and the delocalizedelectrons in the leads connecting the nanotube. We demonstrate thatthe presence of magnetic nanoparticles in the inner core of thenanotube results in a hysteretic behavior of the differential resistance ofthe system when the magneticfield is varied. This behavior is observedin the Kondo diamonds of the stability diagram, and the magnitude ofhysteresis varies with the strength of the Kondo correlations indifferent diamonds. Ourfindings are corroborated with accurate numerical renormalization group calculations performedfor an effective low-energy model involvingfluctuations of the spin on the orbital level of the nanotube due to spinflips ofthe nanoparticles.
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Subhadeep Datta, Ireneusz Weymann, Anna Płomińska, Emmanuel Flahaut, Läetitia Marty, et al.. Detection of Spin Reversal via Kondo Correlation in Hybrid Carbon Nanotube Quantum Dots. ACS Nano, American Chemical Society, 2019, 13 (9), pp.10029-10035. ⟨10.1021/acsnano.9b02091⟩. ⟨hal-02317479⟩

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