Mayrhofer, Leonhard and Grifoni, M. (2008) The spectrum of interacting metallic carbon nanotubes: exchange effects and universality. EUROPEAN PHYSICAL JOURNAL B, 63 (1). pp. 43-58. ISSN 1434-6028,
Full text not available from this repository. (Request a copy)Abstract
The low energy spectrum of finite size metallic single-walled carbon nanotubes (SWNTs) is determined. Starting from a tight binding model for the p(z) electrons, we derive the low energy Hamiltonian containing all relevant scattering processes resulting from the Coulomb interaction, including the short ranged contributions becoming relevant for small diameter tubes. In combination with the substructure of the underlying honeycomb lattice the short ranged processes lead to various exchange effects. Using bosonization the spectrum is determined. We find that the ground state is formed by a spin 1 triplet, if 4n+2 electrons occupy the SWNT and the branch mismatch is smaller than the exchange splitting. Additionally, we calculate the excitation spectra for the different charge states and find the lifting of spin-charge separation as well as the formation of a quasi-continuum at higher excitation energies.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | QUANTUM DOTS; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Grifoni > Group Milena Grifoni |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 03 Nov 2020 09:14 |
| Last Modified: | 03 Nov 2020 09:14 |
| URI: | https://pred.uni-regensburg.de/id/eprint/30937 |
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