Metal-semiconductor transition in armchair carbon nanotubes by symmetry breaking

Yan Li, Slava V. Rotkin, Umberto Ravaioli

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


The electronic band structure of armchair carbon nanotubes may be considerably modified by potentials with angular dependence. Different angular modes V q∼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.

Original languageEnglish (US)
Pages (from-to)4178-4180
Number of pages3
JournalApplied Physics Letters
Issue number18
StatePublished - Nov 1 2004

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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