THEORETICAL INVESTIGATIONS OF QUANTUM TRANSPORT THROUGH CARBON NANOTUBE DEVICES

C. Roland, M. Buongiorno Nardelli, H. Guo, H. Mehrez, J. Taylor, J. Wang and Yi-Ming Wei
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C. Roland: Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
M. Buongiorno Nardelli: Department of Physics, North Carolina State University, Raleigh, NC 27695, USA
H. Guo: Department of Physics and Center for the Physics of Materials, McGill University, Montreal, PQ Canada H3A 2T8, Canada
H. Mehrez: Department of Physics and Center for the Physics of Materials, McGill University, Montreal, PQ Canada H3A 2T8, Canada
J. Taylor: Department of Physics and Center for the Physics of Materials, McGill University, Montreal, PQ Canada H3A 2T8, Canada
J. Wang: Department of Physics, The University of Hong Kong, Pokfulam Road, Hong Kong, China

Surface Review and Letters (SRL), 2000, vol. 07, issue 05n06, 637-642

Abstract: By combining a nonequilibrium Green's function analysis with a standard tight-binding model, we have investigated quantum transport through carbon nanotube devices. For finite-sized nanotubes, transport is dominated by resonant tunneling, with the conductance being strongly dependent on the length of the nanotubes. Turning to nanotube devices, we have investigated spin-coherent transport in ferromagnetic–nanotube–ferromagnetic devices and nanotube-superconducting devices. The former shows a significant spin valve effect, while the latter is dominated by resonant Andreev reflections. In addition, we discuss AC transport through carbon nanotubes and the role of photon-assisted tunneling.

Date: 2000
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DOI: 10.1142/S0218625X00000774

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