A Monte Carlo Study of electron transport in suspended monolayer graphene

A microscopic study of electronic transport in suspended monolayer graphene is presented. The results have been obtained by means of an ensemble Monte Carlo simulator that takes into account the main physical properties of the graphene bandstructure and the most relevant scattering mechanisms for this type of material. The carrier velocity value is mainly set by the dominant influence of optical and acoustic intervalley phonons, particularly at high electric fields, where a negative differential conductance is observed. The average time between scatterings shows an asymptotic behavior with the applied electric field, with values in the order of tenths of ps. The influence of the electric field on the wavevector distribution is also analyzed, showing a saturation trend in the displacement of the charge centroid with a linear increase in the average energy. Finally, the instantaneous velocity and the correlation function of velocity fluctuations are also studied.