Current Distribution Dependence on Electric Field in Helically Coiled Carbon Nanotubes

Abstract

Experimentally is confirmed that helically coiled carbon nanotube (HCCNT) could be used as a small solenoid for generating spatially localized magnetic field. Current distribution during diffusive electronic transport likewise the inductivity of this quantum conductor depends on electric field. Despite slightly lower electron mobility in HCCNTs than that of the straight single wall carbon nanotubes, the coiled nanotubes are attractive for application as nonlinear nano-solenoids. Nonequilibrium electron distribution functions obtained by solving Boltzmann transport equation are used to predict average helical radius of current flow as a function of electric field intensity. Change of spatial distribution of electronic flow with applied electric field is considered and nonlinear inductivity of HCCNT is predicted.

Modeling of Nanoscale Electromagnets Based on Gold Finite Nanosolenoids

“…We hope that these results pave the way for a more realistic design of the nanosolenoids. To the best of our knowledge, this is the first study of the finite-length nanosolenoid where the fringe effects were not ignored. − It is shown that the magnetic fields of the finite nanosolenoids can be an order of magnitude smaller than the field of infinite ones, and spatial distribution of fields is more complex.…”

“…2 As examples of pure carbon-based materials, one can also cite the nanometer-sized graphite helical structures, which behave as a collection of individual, closely packed nanosolenoids, 4 some graphene spiral structures, 5 and the various helically coiled nanotubes with very complex structures. 6,7 The large magnetic fields are anticipated to be realized using solenoids with the carbon nanotubes-copper composite materials. 8 Finally, our previous calculations show that much more efficient nanosolenoids are possible if one turns from carbon to the chiral gold nanotubes (AuNTs).…”

“…However, to date, a very small number of such elements have been proposed outside the framework of conversional silicon technology. It was suggested that the chiral graphene nanoribbons or nanotubes can be properly organized in a form of nanosolenoids to yield the helicoidal currents and magnetic fields strong, confined, and tunable by the nanomaterial composition, chirality, and diameter. − However, the ideal carbon ( n 1 , n 2 ) nanotubes are not quite suitable for this since the nanosolenoids require materials with a metallic type of conductivity, but such tubules with n 1 – n 2 indivisible by 3 are dielectrics and those with n 1 – n 2 divisible by 3 are essentially metallic, but the band gaps usually emerge in this case due to the effects of the cylindrical surface curvature. − Thus, the chemically modified tubules are to be used for these purposes. For example, the nanosolenoids based on a hetero-nanotube consisting of the spiral carbon and boron nitride strips were proposed, and their electrical and magnetic properties were calculated .…”