Linear and nonlinear transport across carbon nanotube quantum dots

Details Linear and nonlinear transport across carbon nanotube quantum dots Linear and nonlinear transport across carbon nanotube quantum dots

2006-12-12

arxiv.org/abs/cond-mat/0612286v2

European Journal of physics B 56, 2 (12/04/2007) 107

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

10.1140/epjb/e2007-00097-3

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.

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