Phys. Rev. Lett. 85, 365–368 (2000)Spin Configurations of a Carbon Nanotube in a Nonuniform External PotentialReceived 4 November 1999; published in the issue dated 10 July 2000 We study, theoretically, the ground state spin of a carbon nanotube in the presence of an external potential. We find that when the external potential is applied to a part of the nanotube, its variation changes the single electron spectrum significantly. This, in combination with Coulomb repulsion and the symmetry properties of a finite length armchair nanotube, induces spin flips in the ground state when the external potential is varied. We discuss the possible application of our theory to recent measurements of Coulomb-blocked peaks and their dependence on a weak magnetic field in armchair carbon nanotubes. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.365
DOI:
10.1103/PhysRevLett.85.365
PACS:
71.24.+q, 61.48.+c, 71.10.-w, 73.23.-b
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