Features of the Electrical Characteristics of an Octagraphene Nanotube

Authors D. Sergeyev1,2

1Zhubanov Aktobe Regional University, 34, Moldagulova Ave., 030000 Aktobe, Kazakhstan

2Begeldinov Military Institute of Air Defense Forces, 39, Moldagulova Ave., 030012 Aktobe, Kazakhstan

Е-mail serdau@rambler.ru
Issue Volume 11, Year 2019, Number 6
Dates Received 09 September 2019; revised manuscript received 05 December 2019; published online 13 December 2019
Citation D. Sergeyev, J. Nano- Electron. Phys. 11 No 6, 06022 (2019)
DOI https://doi.org/10.21272/jnep.11(6).06022
PACS Number(s) 61.46.Fg, 61.48.De, 73.63. – b
Keywords Carbon nanotube (21) , Octagraphene nanotube, Electron transport, Transmission spectrum (2) , Density of states (6) , Current-voltage characteristic (12) , Differential conductivity (3) .

In the framework of the density functional theory (in the local density approximation) and the method of nonequilibrium Green functions (DFT + NEGF), electron transport in graphene and octagraphene nanotubes with approximately the same geometric dimensions (with diameters of 7.08 Å and 7.15 Å and lengths of 41.2 Å and 39.92 Å, respectively) was studied. The transmission spectra, the density of states, current-voltage dI/dV characteristics of graphene and octagraphene nanotubes are calculated. It is shown that, by the nature of the current-voltage characteristic, a graphene nanotube has semiconductor properties, and an octagraphene nanotube has metallic properties. It was revealed that the dI/dV spectrum shows an equidistant series of differential conductivity of Coulomb origin. It is shown that, at resonance voltage, the features of differential conductivity in the form of a maximum in a graphene nanotube are accompanied by a minimum in an octagraphene nanotube. It was found that the amplitudes of the differential conductivity in the form of an equidistant series of graphene nanotubes decrease exponentially, while those of octagraphene nanotubes increase exponentially. The results can be useful for calculating new promising electronic switching nanodevices.

List of References