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Evanescent Wave Transport and Shot Noise in Graphene: Ballistic Regime and Effect of Disorder

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Abstract

We have investigated electrical transport and shot noise in graphene field effect devices. In large width over length ratio W/L graphene strips, we have measured shot noise at low frequency (f=600–850 MHz) in the temperature range of 4.2–30 K. We observe a minimum conductivity of \(\frac{4e^{2}}{\pi h}\) and a finite and gate dependent Fano factor reaching the universal value of \(\frac{1}{3}\) at the Dirac point, i.e. where the density of states vanishes. These findings are in good agreement with the theory describing that transport at the Dirac point should occur via evanescent waves in perfect graphene samples with large W/L. Moreover, we show and discuss how disorder and non-parallel leads affect both conductivity and shot noise.

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Author notes

  1. R. Danneau

    Present address: Institute für Nanotechnologie, Forshungszentrum Karlsruhe, Karlsruhe, Germany

  2. M. F. Craciun & S. Russo

    Present address: Department of Applied Physics, University of Tokyo, Tokyo, Japan

  3. A. F. Morpurgo

    Present address: Département de Physique de la Matière Condensée, Université de Genève, Geneva, Switzerland

Authors and Affiliations

  1. Low Temperature Laboratory, Helsinki University of Technology, Espoo, Finland

    R. Danneau, F. Wu, M. Y. Tomi, J. Salmilehto & P. J. Hakonen

  2. Kavli Institute of Nanoscience, Delft University of Technology, Delft, The Netherlands

    M. F. Craciun, S. Russo & A. F. Morpurgo

Authors
  1. R. Danneau
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Corresponding author

Correspondence to R. Danneau.

Additional information

This work was supported by the Academy of Finland, the EU CARDEQ contract FP6-IST-021285-2 and the NANOSYSTEMS contract with the Nokia Research Center.

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Danneau, R., Wu, F., Craciun, M.F. et al. Evanescent Wave Transport and Shot Noise in Graphene: Ballistic Regime and Effect of Disorder. J Low Temp Phys 153, 374–392 (2008). https://doi.org/10.1007/s10909-008-9837-z

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  • DOI: https://doi.org/10.1007/s10909-008-9837-z

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