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2-electron Wigner molecules in carbon nanotube quantum dots: Excited states

By Mervyn Roy and P.A. Maksym

Abstract

This paper was published as Physica E: Low-dimensional Systems and Nanostructures, 2009, article in press. It is available from http://www.sciencedirect.com/science/journal/13869477. Doi: 10.1016/j.physe.2009.11.024The states of two electrons in a semiconducting nanotube dot are computed by exact diagonalisation of a 2-band effective mass Hamiltonian and compared to the states obtained from a molecular model. The molecular model is found to be accurate for the ground and excited states in a wide range of nanotube dots with different physical properties and this demonstrates that the quantum states are Wigner molecule-like and the electrons are strongly correlated. The first 97 excited states are examined for a physically realistic dot in the strongly correlated regime and, for these states, the molecular model is accurate to within 4%

Publisher: Elsevier
Year: 2009
DOI identifier: 10.1016/j.physe.2009.11.024
OAI identifier: oai:lra.le.ac.uk:2381/7500
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