Bandgap modulation of narrow-gap carbon nanotubes in a transverse electric field

Abstract

We propose a method to modulate the bandgaps in quasi-metallic carbon nanotubes using a transverse electric field. Unlike previous investigations, we include curvature effects of the nanotubes by incorporating both $\pi$- and $\sigma$-orbitals in our tight-binding calculations. The calculations show that the small curvature-induced bandgaps decrease quadratically with electric field amplitude to zero. As the electric field amplitude continues to increase, the bandgap then expands in a similar manner to that presented in earlier studies. The bandgap dependence is verified by analytical calculations, which also agree with preceding analyses for the limit of no curvature.

6 pages, 2 figures, accepted to Europhysics Letters

References in corpus (4)

• Size, Shape and Low Energy Electronic Structure of Carbon Nanotubes
• Electronic response and bandstructure modulation of carbon nanotubes in a transverse electrical field
• Carbon Nanotubes Band Assignation, Topology, Bloch States and Selection Rules
• Can Electric Field Induced Energy Gaps In Metallic Carbon Nanotubes?

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• Terahertz emitters and detectors based on carbon nanotubes
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• Formation of Subgap States in Carbon Nanotubes Due to a Local Transverse Electric Field