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Title

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

Authors
Danneau, R.
Wu, F.
Craciun, M. F.
Russo, S.
Tomi, M. Y.
Salmilehto, J.
Hakonen, P. J.
Published in Journal of Low Temperature Physics. 2008, vol. 153, no. 5-6, p. 374-392
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 4e2πh and a finite and gate dependent Fano factor reaching the universal value of 13 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.
Keywords GrapheneEvanescent wavesShot noise
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DANNEAU, R. et al. Evanescent Wave Transport and Shot Noise in Graphene: Ballistic Regime and Effect of Disorder. In: Journal of Low Temperature Physics, 2008, vol. 153, n° 5-6, p. 374-392. https://archive-ouverte.unige.ch/unige:35113

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Deposited on : 2014-03-31

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