Impact of self-heating and hot phonons on the drift velocity in graphene

Abstract

In this paper we analyze the effects of the hot phonon and self-heating on the static electronic transport characteristics of monolayer graphene. For this purpose, the Ensemble Monte Carlo method self-consistently coupled to a thermal resistive model for the heat dissipation is employed. This way, the most relevant mechanisms that limit the drift velocity are considered in a microscopic framework. Results show that both phenomena -the hot phonon and self-heating- have significant impact, being the hot phonons particularly dominant at moderate fields and high carrier concentrations. Interplay between both phenomena reveals that taking hot phonons into account damps graphene and substrate self-heating due to a drop of the phonon emission/absorption ratio.