To study the phase breaking scattering events in single-wall carbon nanotubes (SWNTs), ropes of SWNTs are intentionally damaged by AI+ ion-milling. Due to this treatment, the average distance an electron can travel before being elastically scattered is reduced to about 10nm. This significantly increases the probability of one-dimensional localization and allows us to obtain the phase coherence length (La) in ropes of SWNTs as a function of temperature. We find that Nyquist scattering as well as another dephasing mechanism with a dependence are involved in limiting the phase coherent transport. We also investigate the scattering of hot electrons in the system. The results support the statement that two different scat,tering mechanisms dominate the phase coherence length for different rope samples.
By: J. Appenzeller, R. Martel, Ph. Avouris, H. Stahl, U. Th. Hunger, B. Lengeler
Published in: RC22062 in 2001
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