Universal scaling of current fluctuations in disordered graphene

Details Universal scaling of current fluctuations in disordered graphene Universal scaling of current fluctuations in disordered graphene

2007-06-26

arxiv.org/abs/0706.3832v2

Physical Review B 76, 195445 (2007)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

9 pages, 7 figures. Published version, includes corrected figure for Fano factor

Scientific paper

10.1103/PhysRevB.76.195445

We analyze the full transport statistics of graphene with smooth disorder at low dopings. First we consider the case of 1D disorder for which the transmission probability distribution is given analytically in terms of the graphene-specific mean free path. All current cumulants are shown to scale with system parameters (doping, size, disorder strength and correlation length) in an identical fashion for large enough systems. In the case of 2D disorder, numerical evidence is given for the same kind of identical scaling of all current cumulants, so that the ratio of any two such cumulants is universal. Specific universal values are given for the Fano factor, which is smaller than the pseudodiffusive value of ballistic graphene (F=1/3) both for 1D (F=0.243) and 2D (F=0.295) disorder. On the other hand, conductivity in wide samples is shown to grow without saturation as \sqrt{L} and Log L with system length L in the 1D and 2D cases respectively.

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