Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots

Details Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots Coulomb versus spin-orbit interaction in few-electron carbon-nanotube quantum dots

2009-03-30

arxiv.org/abs/0903.5107v2

Physical Review B 80, 041404(R) (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

RevTeX 4.0, 4 pages, 4 postscript figures. New Fig. 4 on two-electron wave functions was added, and more insight was given on

Scientific paper

10.1103/PhysRevB.80.041404

Few-electron states in carbon-nanotube quantum dots are studied by means of the configuration-interaction method. The peculiar non-interacting feature of the tunneling spectrum for two electrons, recently measured by Kuemmeth et al. [Nature 452, 448 (2008)], is explained by the splitting of a low-lying isospin multiplet due to spin-orbit interaction. Nevertheless, the strongly-interacting ground state forms a `Wigner molecule' made of electrons localized in space. Signatures of the electron molecule may be seen in tunneling spectra by varying the tunable dot confinement potential.

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