Journal
PHYSICAL REVIEW B
Volume 71, Issue 19, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.71.195401
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It has been known theoretically that localized states exist around the zigzag edges of a graphite ribbon and of a carbon nanotube, whose energy eigenvalues are located between conduction and valence hands, We find that in metallic, zigzag single-walled, carbon nanotubes two of the localized states become critical, and that their localization length is sensitive to the mean curvature of a tube, and it can be controlled by the Aharonov-Bohm flux. The curvature-induced mini gap closes by the relatively weak magnetic field. A conductance measurement in the presence of the Aharonov-Bohm flux can give information about the curvature effect and the critical states.
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