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We present numerical simulations of high field transport in both suspendedand deposited armchair graphene nanoribbon (A-GNR) on HfO2 substrate. Driftvelocity in suspended GNR does not saturate at high electric field (F), butrather decreases, showing a maximum for F=10 kV/cm. Deposition on HfO2 stronglydegrades the drift velocity by up to a factor of 10 with respect to suspendedGNRs in the low-field regime, whereas at high fields drift velocity approachesthe intrinsic value expected in suspended GNRs. Even in the assumption ofperfect edges, the obtained mobility is far behind what expected intwo-dimensional graphene, and is further reduced by surface optical phonons.

Drift velocity peak and negative differential mobility in high field transport in graphene nanoribbons explained by numerical simulations