Approaching the Intrinsic Bandgap in Suspended High-Mobility Graphene Nanoribbons
arXiv:1105.5672 · doi:10.1103/PhysRevB.84.125411
Abstract
We report electrical transport measurements on a suspended ultra-low-disorder graphene nanoribbon(GNR) with nearly atomically smooth edges that reveal a high mobility exceeding 3000 cm2 V-1 s-1 and an intrinsic band gap. The experimentally derived bandgap is in quantitative agreement with the results of our electronic-structure calculations on chiral GNRs with comparable width taking into account the electron-electron interactions, indicating that the origin of the bandgap in non-armchair GNRs is partially due to the magnetic zigzag edges.
22 pages, 6 figures
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- Crossover from Coulomb blockade to quantum Hall effect in suspended graphene nanoribbons