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Title: Effects of moiré lattice structure on electronic properties of graphene

Here, we study structural and electronic properties of graphene grown on silicone carbide (SiC) substrate using a scanning tunneling microscope, spot-profile-analysis low-energy electron diffraction, and angle-resolved photoemission spectroscopy. We find several new replicas of Dirac cones in the Brillouin zone. Their locations can be understood in terms of a combination of basis vectors linked to SiC 6 × 6 and graphene 6√3×6√3 reconstruction. Therefore, these new features originate from the moiré caused by the lattice mismatch between SiC and graphene. More specifically, Dirac cone replicas are caused by underlying weak modulation of the ionic potential by the substrate that is then experienced by the electrons in the graphene. We also demonstrate that this effect is equally strong in single- and trilayer graphene; therefore, the additional Dirac cones are intrinsic features rather than the result of photoelectron diffraction. These new features in the electronic structure are very important for the interpretation of recent transport measurements and can assist in tuning the properties of graphene for practical applications.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Ames Lab. and Iowa State Univ., Ames, IA (United States)
Publication Date:
Report Number(s):
IS-J-9404
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US1702792
Grant/Contract Number:
AC02-07CH11358
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 3; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Ames Lab., Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1374743
Alternate Identifier(s):
OSTI ID: 1369091

Huang, Lunan, Wu, Yun, Hershberger, M. T., Mou, Daixiang, Schrunk, Benjamin, Tringides, Michael C., Hupalo, Myron, and Kaminski, Adam. Effects of moiré lattice structure on electronic properties of graphene. United States: N. p., Web. doi:10.1103/PhysRevB.96.035411.
Huang, Lunan, Wu, Yun, Hershberger, M. T., Mou, Daixiang, Schrunk, Benjamin, Tringides, Michael C., Hupalo, Myron, & Kaminski, Adam. Effects of moiré lattice structure on electronic properties of graphene. United States. doi:10.1103/PhysRevB.96.035411.
Huang, Lunan, Wu, Yun, Hershberger, M. T., Mou, Daixiang, Schrunk, Benjamin, Tringides, Michael C., Hupalo, Myron, and Kaminski, Adam. 2017. "Effects of moiré lattice structure on electronic properties of graphene". United States. doi:10.1103/PhysRevB.96.035411. https://www.osti.gov/servlets/purl/1374743.
@article{osti_1374743,
title = {Effects of moiré lattice structure on electronic properties of graphene},
author = {Huang, Lunan and Wu, Yun and Hershberger, M. T. and Mou, Daixiang and Schrunk, Benjamin and Tringides, Michael C. and Hupalo, Myron and Kaminski, Adam},
abstractNote = {Here, we study structural and electronic properties of graphene grown on silicone carbide (SiC) substrate using a scanning tunneling microscope, spot-profile-analysis low-energy electron diffraction, and angle-resolved photoemission spectroscopy. We find several new replicas of Dirac cones in the Brillouin zone. Their locations can be understood in terms of a combination of basis vectors linked to SiC 6 × 6 and graphene 6√3×6√3 reconstruction. Therefore, these new features originate from the moiré caused by the lattice mismatch between SiC and graphene. More specifically, Dirac cone replicas are caused by underlying weak modulation of the ionic potential by the substrate that is then experienced by the electrons in the graphene. We also demonstrate that this effect is equally strong in single- and trilayer graphene; therefore, the additional Dirac cones are intrinsic features rather than the result of photoelectron diffraction. These new features in the electronic structure are very important for the interpretation of recent transport measurements and can assist in tuning the properties of graphene for practical applications.},
doi = {10.1103/PhysRevB.96.035411},
journal = {Physical Review B},
number = 3,
volume = 96,
place = {United States},
year = {2017},
month = {7}
}

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