Shot Noise Suppression and Hopping Conduction in Graphene Nanoribbons

Details Shot Noise Suppression and Hopping Conduction in Graphene Nanoribbons Shot Noise Suppression and Hopping Conduction in Graphene Nanoribbons

2010-05-24

arxiv.org/abs/1005.4403v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

We have investigated shot noise and conduction of graphene field effect nanoribbon devices at low temperature. By analyzing the exponential $I-V$ characteristics of our devices in the transport gap region, we found out that transport follows variable range hopping laws at intermediate bias voltages $1 < V_{bias} < 12$ mV. In parallel, we observe a strong shot noise suppression leading to very low Fano factors. The strong suppression of shot noise is consistent with inelastic hopping, in crossover from one- to two-dimensional regime, indicating that the localization length $l_{loc} < W$ in our nanoribbons.

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