Metal-semiconductor transition in armchair carbon nanotubes by symmetry breaking

Yan Li; Rotkin, Slava V.; Ravaioli, Umberto
November 2004
Applied Physics Letters;11/1/2004, Vol. 85 Issue 18, p4178
Academic Journal
The electronic band structure of armchair carbon nanotubes may be considerably modified by potentials with angular dependence. Different angular modes Vq∼cos qθ have been studied within a tight-binding scheme. Using symmetry arguments, we demonstrate a bandgap opening in these metallic nanotubes when certain selection rules are satisfied for both potential and nanotube structure. We estimate the bandgap opening as a function of both the external potential strength and the nanotube radius and suggest an effective mechanism of metal-semiconductor transition by combination of different forms of perturbations.


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