Abstract:
We have performed noise measurements on suspended ropes of single wall carbon nanotubes (SWNT) between 1 and 300 K for different values of dc current through the ropes. We find that the shot noise is suppressed by more than a factor 100 compared to the full shot noise 2eI. We have also measured an individual SWNT and found a level of noise which is smaller than the minimum expected. Another finding is the very low level of 1/f noise, which is significantly lower than previous observations. We propose two possible interpretations for the strong shot noise reduction: i) Transport within a rope takes place through few nearly ballistic tubes within a rope and possibly involves non integer effective charges with e *∼ 0.3e. ii) A substantial fraction of the tubes conduct with a strong reduction of effective charge (by more than a factor 50).
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Received 25 January 2002 Published online 19 July 2002
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Roche, PE., Kociak, M., , . et al. Very low shot noise in carbon nanotubes. Eur. Phys. J. B 28, 217–222 (2002). https://doi.org/10.1140/epjb/e2002-00223-9
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DOI: https://doi.org/10.1140/epjb/e2002-00223-9