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

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

preprint2011arXivOpen access
Alessandro BettiGianluca FioriGiuseppe Iannaccone
cond-mat.mes-hall
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Alessandro BettiGianluca FioriGiuseppe Iannaccone

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