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

Subhadeep Datta (1, 2) , Ireneusz Weymann (3) , Anna Płomińska (3) , Emmanuel Flahaut (4) , Läetitia Marty (5) , Wolfgang Wernsdorfer (1, 6)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 IACS - Indian Association for the Cultivation of Science
3 UAM - Uniwersytet im. Adama Mickiewicza w Poznaniu = Adam Mickiewicz University in Poznań
4 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux
5 NEEL - Quan2m - Interactions modulables dans des états quantiques 2D
6 KIT - Karlsruhe Institute of Technology

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.

Mots clés: Kondo effect; Magnetic nanoparticles; Magnetization reversal; Magnetotransport; Molecular electronics; Quantum dots; Carbon nanotube

Domaines: Matériaux; Electronique

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, 2019, 13 (9), pp.10029-10035. ⟨10.1021/acsnano.9b02091⟩. ⟨hal-02317479⟩