Orbital Kondo effect in carbon nanotubes

Pablo Jarillo-Herrero (), Jing Kong, Herre S.J. van der Zant, Cees Dekker, Leo P. Kouwenhoven and Silvano De Franceschi
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Pablo Jarillo-Herrero: Delft University of Technology
Jing Kong: Delft University 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

Nature, 2005, vol. 434, issue 7032, 484-488

Abstract: 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.

Date: 2005
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DOI: 10.1038/nature03422

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