NSTI Nanotech 2009

Carbon nanorings for spintronics applications

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

Keywords: toroidal carbon nanotube, electron transport, magnetic flux, gate voltage, Fermi level, Greenís function, tight-binding, Aharonov-Bohm oscillation, universal conductance fluctuation, magnetic moment


Novel electronic transport and spin control characteristics of carbon nanostructures under optical excitation make them promising candidates for spintronics device applications with added biosensory capabilities. For a toroidal carbon nanotube, small bias transport under microwave illumination is calculated in a tight-binding approximation using a non-equilibrium Greenís function methods. Metallic leads are attached below the torus geometry to simulate realistic device architectures for different electronic device-to-lead couplings. Density-of-states D(E), transmission function T(E) and source-drain current ISD are compared e.g. for a (3,3) armchair and a (6,0) zigzag carbon nanotorus. Polarized coherent microwave radiation with added constant magnetic field oriented along the central toroidal axis are expected to generate coherent transport features. Further, off-axis magnetic moments arising from currents circulating around the toroidal minor radius exist, which are of potential interest for spintronics applications. Significant computational speed-up is expected for a parallelized algorithm on a multi-core computer cluster applying fast SCALAPACK routines for band matrices. The dependence of transport parameters on torus size and curvature will be studied for different realistic nanodevice sizes of a few thousand or more atoms.
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