Zero-field splitting of Kondo resonances in a carbon nanotube quantum dot

Details Zero-field splitting of Kondo resonances in a carbon nanotube quantum dot Zero-field splitting of Kondo resonances in a carbon nanotube quantum dot

2004-10-19

arxiv.org/abs/cond-mat/0410467v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages, 3 figures

Scientific paper

We present low-temperature electron transport measurements on a single-wall carbon nanotube quantum dot exhibiting Kondo resonances at low temperature. Contrary to the usual behavior for the spin-1/2 Kondo effect we find that the temperature dependence of the zero bias conductance is nonmonotonic. In nonlinear transport measurements low-energy splittings of the Kondo resonances are observed at zero magnetic field. We suggest that these anomalies reflect interactions between the nanotube and a magnetic (catalyst) particle. The nanotube device may effectively act as a ferromagnetically contacted Kondo dot.

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