Magneto-Coulomb Effect in Carbon Nanotube Quantum Dots Filled with Magnetic Nanoparticles

Subhadeep Datta (1) , Laëtitia Marty (2) , Jean-Pierre Cleuziou (1) , Carmen Tilmaciu (3) , Brigitte Soula (3) , Emmanuel Flahaut (3) , Wolfgang Wernsdorfer (1)

1 NEEL - QuantECA - Circuits électroniques quantiques Alpes
2 NEEL - Quan2m - Interactions modulables dans des états quantiques 2D
3 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Electrical transport measurements of carbon nanotubes filled with magnetic iron nanoparticles are reported. Low-temperature (40 mK) magnetoresistance measurements showed conductance hysteresis with sharp jumps at the switching fields of the nanoparticles. Depending on the gate voltage, positive or negative hysteresis was observed. The results are explained in terms of a magneto-Coulomb effect: The spin flip of the iron island at a nonzero magnetic field causes a shift of the chemical potential induced by the change of Zeeman energy; i.e., an effective charge variation is detected by the nanotube quantum dot.

Mots clés: Magneto-Coulomb Effect (MCE); Carbon nanotubes; DWCNTs; Magnetic nanoparticles

Domaines: Matière Condensée [cond-mat]

Subhadeep Datta, Laëtitia Marty, Jean-Pierre Cleuziou, Carmen Tilmaciu, Brigitte Soula, et al.. Magneto-Coulomb Effect in Carbon Nanotube Quantum Dots Filled with Magnetic Nanoparticles. Physical Review Letters, 2011, 107 (18), pp.186804. ⟨10.1103/PhysRevLett.107.186804⟩. ⟨hal-00719538⟩