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Article Dans Une Revue Physical Review B Année : 2019

Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes

Résumé

Zigzag-edge graphene sidewall ribbons grown on 6H-SiC {11 2n} facet walls are ballistic conductors. It is assumed that graphene sidewall ribbons grown on 4H-SiC {11 2n} facets would also be ballistic. In this work, we show that SiC polytype indeed matters: ballistic sidewall graphene ribbons only grow on 6H-SiC facets. 4H and 4H-passivated sidewall graphene ribbons are diffusive conductors. Detailed photoemission and microscopy studies show that 6H-SiC sidewall zigzag ribbons are metallic with a pair of n-doped edge states associated with asymmetric edge terminations. In contrast, 4H-SiC zigzag ribbons are strongly bonded to the SiC, severely distorting the ribbon's π bands. H 2 passivation of the 4H ribbons returns them to a metallic state but they show no evidence of edge states in their photoemission-derived band structure.
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hal-04106155 , version 1 (25-05-2023)

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Paternité

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Anna L. Miettinen, Meredith S. Nevius, Wonhee Ko, Marek Kolmer, An-Ping Li, et al.. Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes. Physical Review B, 2019, 100 (4), pp.045425. ⟨10.1103/PhysRevB.100.045425⟩. ⟨hal-04106155⟩
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