Abstract
This paper investigates the property of shot noise for low energy electron field emission from a single-layer vertically aligned graphene sheet assuming the emission process is due to Klein tunneling. In our model, we use two different methods (relativistic WKB and transfer matrix) to calculate the transmission coefficient and thus obtain the Fano factor (gamma or suppression of shot noise) as a function of temperature T, Fermi energy E-f, and local electric field F. It is found that a universal maximum value of about gamma = 1/3 can be reached at low temperature limit within a certain range of local electric field. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4733349]