https://doi.org/10.1140/epjb/e2002-00223-9
Very low shot noise in carbon nanotubes
1
Laboratoire de Physique des Solides (Associé au CNRS) ,
bâtiment 510, Université Paris-Sud, 91405 Orsay Cedex, France
2
Laboratoire de Physique de la Matière Condensée, École
Normale Supérieure, 24 rue Lhomond, 75231 Paris Cedex 05, France
3
Institute of Microelectronics Technology and High Purity
Materials, Russian Academy of Sciences, Chernogolovka 142432 Moscow
Region, Russia
Corresponding author: a Philippe.Roche@lpmc.ens.fr
Received:
25
January
2002
Published online:
19
July
2002
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 . ii) A substantial fraction of the tubes
conduct with a strong reduction of effective charge
(by more than a factor 50).
PACS: 72.70.+m – Noise processes and phenomena / 73. – Electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2002