Edge states and ballistic transport in zigzag graphene ribbons: The role of SiC polytypes
Abstract
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.
- Authors:
-
- 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)
- 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)
- 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. https://doi.org/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. https://doi.org/10.1103/PhysRevB.100.045425. https://www.osti.gov/servlets/purl/1560407.
@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 = {Tue Jul 30 00:00:00 EDT 2019},
month = {Tue Jul 30 00:00:00 EDT 2019}
}
Web of Science
Figures / Tables:
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