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Linear and nonlinear transport across carbon nanotube quantum dots

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  • L. Mayrhofer
  • M. Grifoni

Abstract

We present a low energy-theory for non-linear transport in finite-size interacting single-wall carbon nanotubes. It is based on a microscopic model for the interacting p z electrons and successive bosonization. We consider weak coupling to the leads and derive equations of motion for the reduced density matrix. We focus on the case of large-diameter nanotubes where exchange effects can be neglected. In this situation the energy spectrum is highly degenerate. Due to the multiple degeneracy, diagonal as well as off-diagonal (coherences) elements of the density matrix contribute to the nonlinear transport. At low bias, a four-electron periodicity with a characteristic ratio between adjacent peaks is predicted. Our results are in quantitative agreement with recent experiments. Copyright EDP Sciences/Società Italiana di Fisica/Springer-Verlag 2007

Suggested Citation

  • L. Mayrhofer & M. Grifoni, 2007. "Linear and nonlinear transport across carbon nanotube quantum dots," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 56(2), pages 107-125, March.
    • Handle: RePEc:spr:eurphb:v:56:y:2007:i:2:p:107-125
    DOI: 10.1140/epjb/e2007-00097-3
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