2007 NSTI Nanotechnology Conference and Trade Show - Nanotech 2007 - 10th Annual

Quantum electron transport in toroidal carbon nanotubes

M. Encinosa and M. Jack
Florida A&M University, US

Keywords:
toroidal carbon nanotube, electron transport, Green's function, transmission function

Abstract:
The authors have extended earlier studies for metallic toroidal nanostructures to calculating the density-of-states and transmission function for toroidal carbon nanotubes with attached metallic or carbon nanotube leads. The Green’s function of the nanodevice region is calculated in a tight-binding approximation. Initial investigations for a smaller model (i.e. a graphene sheet of 150 layers of a 12-carbon-atom super cell wrapped to a nanotorus) have been expanded to simulations of larger, more realistic systems with different geometric attachments of the leads on a parallel computer cluster. In earlier work, the existence and relevance of solenoidal surface currents on a metallic nanotorus surface in a microwave field and their effects on the total magnetic moment have been calculated. Substantial enhancements of the magnetic moment’s solenoidal mode versus the dipole mode had been achieved in simulations. Discussion of these effects is important for spintronics applications of nanotube structures. References: 1. M. Encinosa and M. Jack, Excitation of surface dipole and solenoidal modes on toroidal structures. Photonics and Nanostructures (Elsevier), May 2006 (submitted). E-print archive: physics/0604214. 2. M. Encinosa and M. Jack, Elliptical tori in a constant magnetic field. Phys. Scr. 73 (2006) 439 – 442. E-print archive: quant-ph/0509172. 3. M. Encinosa and M. Jack, Dipole and solenoidal magnetic moments of electronic surface currents on toroidal nanostructures. Journal of Computer-Aided Materials Design (Springer), May 2006. Proceedings of the conference ‘Synergy between Experiment and Computation in Nanoscale Science’ at Harvard University’s Center for Nanoscale Systems, Cambridge, MA, May 31 – June 03, 2006 (In Press).

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