Kondo Physics in Nanotubes: Magnetic-field dependence and singlet-triplet Kondo

Details Kondo Physics in Nanotubes: Magnetic-field dependence and singlet-triplet Kondo Kondo Physics in Nanotubes: Magnetic-field dependence and singlet-triplet Kondo

2007-04-27

arxiv.org/abs/0704.3641v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pp., 5 fig. cond-mat/0606258 was split into two papers to clarify their separate stories. cond-mat/0606258v2 treats the eff

Scientific paper

In a single-walled carbon nanotube, we observe the spin-1/2 Kondo effect. The energy of spin-resolved Kondo peaks is proportional to magnetic field at high fields, contrary to recent reports. At lower fields, the energy falls below this linear dependence, in qualitative agreement with theoretical expectations. For even electron occupancy, we observe a spin-1 Kondo effect due to the degeneracy of the triplet ground states. Tuning gate voltage within the same Coulomb diamond drives a transition to a singlet ground state. We also independently tune the energy difference between singlet and triplet states with a magnetic field. The Zeeman splitting thus measured confirms the value of the g-factor measured from the spin-1/2 Kondo feature.

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