Volume 85, Number 3, February 2009
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||13 February 2009|
Local and non-local shot noise in multiwalled carbon nanotubes
Low Temperature Laboratory, Helsinki University of Technology - FI-02015 Espoo, Finland, EU
2 Chinese Academy of Sciences - Beijing, China
Accepted: 15 January 2009
We have investigated shot noise in multiterminal, disordered multiwalled carbon nanotubes (MWNTs) at 4.2 K over the frequency f = 600–850 MHz. Quantitative comparison of our data to semiclassical theory, based on non-equilibrium distribution functions, indicates that a major part of the noise is caused by a non-equilibrium state imposed by the contacts. Our data exhibits non-local shot noise across weakly transmitting contacts while a low-impedance contact eliminates such noise almost fully. Within our model we obtain < 0.1 for the intrinsic Fano factor of our MWNTs. This behavior cannot be explained by the presence of ballistic channels.
PACS: 73.63.-b – Electronic transport in nanoscale materials and structures / 73.63.Fg – Nanotubes / 05.40.Ca – Noise
© EPLA, 2009
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