The role of substrate for transport in graphene

We study the mobility and high field velocity in graphene placed upon various substrates, such as BN, SiC, or SiO
₂
. The transport is subject to the intrinsic phonons in graphene, as well as flexural modes, but it is the remote polar modes from the substrate and impurities sited between the substrate layer and the graphene that dominate the mobility and velocity.