Transport properties of double-walled carbon nanotube quantum dots

Details Transport properties of double-walled carbon nanotube quantum dots Transport properties of double-walled carbon nanotube quantum dots

2007-08-10

arxiv.org/abs/0708.1436v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

18 pages, 7 figures

Scientific paper

10.1103/PhysRevB.77.085431

The transport properties of quantum dot (QD) systems based on double-walled carbon nanotube (DWCNT) are investigated. The interplay between microscopic structure and strong Coulomb interaction is treated within a bosonization framework. The linear and nonlinear G-V-V_g characteristics of the QD system is calculated by starting from the Liouville equation for the reduced density matrix. Depending on the intershell couplings, an 8-electron periodicity of the Coulomb blockade peak spacing in the case of commensurate DWCNT QDs and a 4-electron periodicity in the incommensurate case are predicted. The contribution of excited states of DWCNTs to the nonlinear transport is investigated as well.

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