SU(4) Kondo rffect in carbon nanotubes

Mahn-Soo Choi, Rosa López, Ramón Aguado

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Abstract

We investigate theoretically the nonequilibrium transport properties of carbon nanotube quantum dots. Owing to the two-dimensional band structure of graphene, a double orbital degeneracy plays the role of a pseudospin, which is entangled with the spin. Quantum fluctuations between these 4 degrees of freedom result in an SU(4) Kondo effect at low temperatures. This exotic Kondo effect manifests as a four-peak splitting in the nonlinear conductance when an axial magnetic field is applied.

Original languageEnglish
Article number067204
JournalPhysical Review Letters
Volume95
Issue number6
DOIs
Publication statusPublished - 2005 Aug 5

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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