Spin configurations of a carbon nanotube in a nonuniform external potential |
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Authors: | Oreg Byczuk Halperin |
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Institution: | Lyman Laboratory of Physics, Harvard University, Cambridge, Massachusetts 02138, USA. |
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Abstract: | 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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