The low energy spectrum of finite size metallic SWNTs

Leonhard Mayrhofer (1) , Milena Grifoni (1)

1 Institut für theoretische Physik, Universität Regensburg

The electronic spectrum of metallic finite-size single-wall carbon nanotubes at low energies is derived. It is based on a tight-binding description for the interacting p_{z} electrons. Not only the forward scattering parts of the Coulomb interaction, which are diagonalized by bosonization, are considered, but also all other processes becoming relevant for small diameter tubes. As a consequence of the substructure of the underlying lattice, a spin 1 triplet is found as ground state if the exchange splitting is larger than the branch mismatch, a spin 0 singlet otherwise. Moreover the excitation spectrum is calculated.

Domaines: Systèmes mésoscopiques et effet Hall quantique [cond-mat.mes-hall]; Electrons fortement corrélés [cond-mat.str-el]

Leonhard Mayrhofer, Milena Grifoni. The low energy spectrum of finite size metallic SWNTs. The European Physical Journal B: Condensed Matter and Complex Systems, 2008, 63, pp.43-58. ⟨10.1140/epjb/e2008-00204-0⟩. ⟨hal-00166887⟩