Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 2, Pages 365-368Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.365
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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.
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