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Orbital Kondo effect in carbon nanotubes

Author

Listed:
  • Pablo Jarillo-Herrero

    (Delft University of Technology)

  • Jing Kong

    (Delft University of Technology
    Massachusetts Institute of Technology)

  • Herre S.J. van der Zant

    (Delft University of Technology)

  • Cees Dekker

    (Delft University of Technology)

  • Leo P. Kouwenhoven

    (Delft University of Technology)

  • Silvano De Franceschi

    (Delft University of Technology
    Massachusetts Institute of Technology)

Abstract

Progress in the fabrication of nanometre-scale electronic devices is opening new opportunities to uncover deeper aspects of the Kondo effect1—a characteristic phenomenon in the physics of strongly correlated electrons. Artificial single-impurity Kondo systems have been realized in various nanostructures, including semiconductor quantum dots2,3,4, carbon nanotubes5,6 and individual molecules7,8. The Kondo effect is usually regarded as a spin-related phenomenon, namely the coherent exchange of the spin between a localized state and a Fermi sea of delocalized electrons. In principle, however, the role of the spin could be replaced by other degrees of freedom, such as an orbital quantum number9,10. Here we show that the unique electronic structure of carbon nanotubes enables the observation of a purely orbital Kondo effect. We use a magnetic field to tune spin-polarized states into orbital degeneracy and conclude that the orbital quantum number is conserved during tunnelling. When orbital and spin degeneracies are present simultaneously, we observe a strongly enhanced Kondo effect, with a multiple splitting of the Kondo resonance at finite field and predicted to obey a so-called SU(4) symmetry.

Suggested Citation

  • Pablo Jarillo-Herrero & Jing Kong & Herre S.J. van der Zant & Cees Dekker & Leo P. Kouwenhoven & Silvano De Franceschi, 2005. "Orbital Kondo effect in carbon nanotubes," Nature, Nature, vol. 434(7032), pages 484-488, March.
    • Handle: RePEc:nat:nature:v:434:y:2005:i:7032:d:10.1038_nature03422
    DOI: 10.1038/nature03422
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    Cited by:

    1. Kosuke Noro & Yusuke Kozuka & Kazuma Matsumura & Takeshi Kumasaka & Yoshihiro Fujiwara & Atsushi Tsukazaki & Masashi Kawasaki & Tomohiro Otsuka, 2024. "Parity-independent Kondo effect of correlated electrons in electrostatically defined ZnO quantum dots," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    2. Erick Josephat Kalori, 2023. "Natural Radioactivity and Associated Radiological Hazard Indices in Carbonatite Rocks from Oldoinyo Lengai, Tanzania," International Journal of Research and Innovation in Applied Science, International Journal of Research and Innovation in Applied Science (IJRIAS), vol. 8(11), pages 01-23, November.

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