Abstract
We show that a ballistic quantum transport model based on the effective mass approximation can fairly well describe the I– V characteristics of armchair graphene nanoribbon FETs at all bias conditions, including regimes dominated by direct or band-to-band tunneling, provided first-order non-parabolic corrections be included in the simulation. This is achieved by means of an energy (position) dependent effective mass. The analysis is supported by comparisons with an atomistic tight-binding model.
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