Abstract
Changes in the band structure of carbon nanotubes induced by twisting of the tubes around their axes are studied by quantum-chemical methods, namely, the symmetrized augmented cylindrical waves ab initio method. The effects of torsional modes on the electronic properties of achiral and chiral, semiconducting, metal, and quasi-metal nanotubes are calculated. It is found that, due to the intersection of dispersion curves, twisting of chiral tubes leads to complex dependences of the optical gap on the torsional mode amplitude. In zigzag-type achiral semiconductor tubes, the band structure and band gaps are stable toward torsional modes. In armchair tubes twisting leads to the rapid formation and increase of the band gap. In chiral and achiral, metallic and quasi-metallic nanotubes, the optical gap increases independently of the tube twisting direction, while in semiconductor nanotubes, it depends thereon. Our results can be used for the design of elements of nanoelectromechanical carbon nanotube systems.
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AKNOWLEDGMENTS
This work was fulfilled in the frame of the Governmental assignment to the Kurnakov Institute.
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D’yachkov, P.N. Influence of Torsional Strains on the Band Structure of Carbon Nanotubes according to the Cylindrical Waves Method. Russ. J. Inorg. Chem. 66, 852–860 (2021). https://doi.org/10.1134/S0036023621060085
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DOI: https://doi.org/10.1134/S0036023621060085