Scattering and Localization Phenomena

Knowledge of the transport mechanism is an essential requirement if nano-tubes are to be used in nanoelectronics. The nature of transport determines fundamental properties such as the amount and location of energy dissipation and the speed of signal propagation. The transport mechanism, however, is not determined only by the intrinsic properties of the nanotube itself, but also by the presence of scatterers such as defects, impurities, structural distortions, tube-tube interactions in ropes, substrate charges, and the nature of the contacts to the macroscopic leads. Thus, while a single metallic nanotube should ideally have a conductance of 4e2/h [38], a much lower conductance is usually observed. Experimentally, it is not always possible to disentangle the multiple contributions to the measured resistance of a nanotube.

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