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

Abstract

Zigzag-edge graphene sidewall ribbons grown on 6 H-SiC {11¯2n} facet walls are ballistic conductors. Here, it is assumed that graphene sidewall ribbons grown on 4 H-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 6 H-SiC facets. 4 H and 4 H-passivated sidewall graphene ribbons are diffusive conductors. Detailed photoemission and microscopy studies show that 6 H-SiC sidewall zigzag ribbons are metallic with a pair of n-doped edge states associated with asymmetric edge terminations. In contrast, 4 H-SiC zigzag ribbons are strongly bonded to the SiC, severely distorting the ribbon's π bands. H 2 passivation of the 4 H ribbons returns them to a metallic state but they show no evidence of edge states in their photoemission-derived band structure.

Authors:
 [1];  [1]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [3];  [4];  [4];  [1];  [5]
  1. The Georgia Inst. of Technology, Atlanta, GA (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Synchrotron SOLEIL, Gif-sur-Yvette (France)
  4. CNRS-Univ. de Lorraine, Vandoeuvre les Nancy (France)
  5. Univ. Paris-Sud, Orsay Cedex (France); Synchrotron SOLEIL, Gif sur Yvette (France)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1560407
Alternate Identifier(s):
OSTI ID: 1545954
Grant/Contract Number:  
[AC05-00OR22725]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
[ Journal Volume: 100; Journal Issue: 4]; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Miettinen, Anna L., Nevius, M. S., Ko, Wonhee, Kolmer, Marek A., Li, An -Ping, Nair, M. N., Kierren, B., Moreau, L., Conrad, Edward H., and Tejeda, A. Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes. United States: N. p., 2019. Web. doi:10.1103/PhysRevB.100.045425.
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. Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes. United States. doi:10.1103/PhysRevB.100.045425.
Miettinen, Anna L., Nevius, M. S., Ko, Wonhee, Kolmer, Marek A., Li, An -Ping, Nair, M. N., Kierren, B., Moreau, L., Conrad, Edward H., and Tejeda, A. Tue . "Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes". United States. doi:10.1103/PhysRevB.100.045425.
@article{osti_1560407,
title = {Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes},
author = {Miettinen, Anna L. and Nevius, M. S. and Ko, Wonhee and Kolmer, Marek A. and Li, An -Ping and Nair, M. N. and Kierren, B. and Moreau, L. and Conrad, Edward H. and Tejeda, A.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.100.045425},
journal = {Physical Review B},
number = [4],
volume = [100],
place = {United States},
year = {2019},
month = {7}
}

Journal Article:
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