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

Miettinen, Anna L.; Nevius, M. S.; Ko, Wonhee; Kolmer, Marek A.; Li, An -Ping; Nair, M. N.; Kierren, B.; Moreau, L.; Conrad, Edward H.; Tejeda, A.

doi:10.1103/PhysRevB.100.045425

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

Journal Article · Tue Jul 30 00:00:00 EDT 2019 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.100.045425· OSTI ID:1560407

Miettinen, Anna L. ^[1]; Nevius, M. S. ^[1];

^[2];

^[2]; Nair, M. N. ^[3]; Kierren, B. ^[4]; Moreau, L. ^[4]; Conrad, Edward H. ^[1]; Tejeda, A. ^[5]

The Georgia Inst. of Technology, Atlanta, GA (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Synchrotron SOLEIL, Gif-sur-Yvette (France)
CNRS-Univ. de Lorraine, Vandoeuvre les Nancy (France)
Univ. Paris-Sud, Orsay Cedex (France); Synchrotron SOLEIL, Gif sur Yvette (France)

Zigzag-edge graphene sidewall ribbons grown on 6H-SiC {11¯2n} facet walls are ballistic conductors. Here, 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. H₂ 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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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1560407

Alternate ID(s):: OSTI ID: 1545954

Journal Information:: Physical Review B, Vol. 100, Issue 4; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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