Interacting electrons in a semiconducting carbon nanotube dot: A 2-band approach

A new 2-band effective mass theory for the interacting electron states in a carbon nanotube quantum dot is outlined. The states of two interacting electrons are calculated by exact diagonalisation of the 2-band Hamiltonian. A range of different nanotube and dot parameters are investigated and, interestingly, the 2-electron ground states are found to be ferromagnetic.