This is the author’s final draft of the paper published as Journal of Physics : Conference Series, 2010, 242 (1). The final published version is available at http://iopscience.iop.org/1742-6596/242/1/012007/, Doi: 10.1088/1742-6596/242/1/012007The 3 and 4-electron states of a gated semiconducting carbon nanotube quantum dot are calculated by exact diagonalisation of a modified effective mass Hamiltonian. A typical nanotube quantum dot is examined and the few-electron states are Wigner molecule-like. The exact diagonalisation method and the rate of convergence of the calculation are discussed
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