Issue
EPL
Volume 86, Number 3, May 2009
Article Number 37001
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/86/37001
Published online 07 May 2009
EPL, 86 (2009) 37001
DOI: 10.1209/0295-5075/86/37001

Semiconducting carbon nanotube quantum dots: Calculation of the interacting electron states by exact diagonalisation

Mervyn Roy and P. A. Maksym

Department of Physics and Astronomy, University of Leicester - University Road, Leicester LE1 7RH, UK, EU

mr6@le.ac.uk

received 30 October 2008; accepted in final form 2 April 2009; published May 2009
published online 7 May 2009

Abstract
In semiconducting carbon nanotube quantum dots that contain a few interacting electrons the electron-electron correlation is always important. The states of up to six interacting electrons in such a dot are calculated by exact diagonalisation of a 2-band, effective mass Hamiltonian. The addition energy and the few-electron density are investigated for a wide range of dots with different physical properties and, in a large proportion of these dots, the electrons are found to form Wigner molecules.

PACS
73.63.Fg - Nanotubes.
73.21.La - Quantum dots.
73.23.Hk - Coulomb blockade; single-electron tunneling.

© EPLA 2009