Shell Filling in Closed Single-Wall Carbon Nanotube Quantum Dots

David H. Cobden and Jesper Nygård
Phys. Rev. Lett. 89, 046803 – Published 3 July 2002
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Abstract

We observe twofold shell filling in the spectra of closed one-dimensional quantum dots formed in single-wall carbon nanotubes. Its signatures include a bimodal distribution of addition energies, correlations in the excitation spectra for different electron number, and alternation of the spins of the added electrons. This provides a contrast with quantum dots in higher dimensions, where such spin pairing is absent. We also see indications of an additional fourfold periodicity indicative of KK subband shells. Our results suggest that the absence of shell filling in most isolated nanotube dots results from disorder or nonuniformity.

  • Received 6 December 2001

DOI:https://doi.org/10.1103/PhysRevLett.89.046803

©2002 American Physical Society

Authors & Affiliations

David H. Cobden1,2,* and Jesper Nygård2,†

  • 1Department of Physics, University of Washington, Seattle, Washington 98195-1560
  • 2Niels Bohr Institute, Ørsted Laboratory, Universitetsparken 5, DK-2100 Copenhagen, Denmark

  • *Electronic address: cobden@phys.washington.edu
  • Electronic address: nygard@nbi.dk

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Vol. 89, Iss. 4 — 22 July 2002

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