Abstract
On the basis of first-principles calculations, we report that a novel interfacial atomic structure occurs between graphene and the surface of silicon carbide, destroying the Dirac point of graphene and opening a substantial energy gap there. In the calculated atomic structures, a quasiperiodic 6×6 domain pattern emerges out of a larger commensurate 63×63R30° periodic interfacial reconstruction, resolving a long standing experimental controversy on the periodicity of the interfacial superstructures. Our theoretical energy spectrum shows a gap and midgap states at the Dirac point of graphene, which are in excellent agreement with the recently observed anomalous angle-resolved photoemission spectra. Beyond solving unexplained issues in epitaxial graphene, our atomistic study may provide a way to engineer the energy gaps of graphene on substrates.
| Original language | English |
|---|---|
| Article number | 176802 |
| Journal | Physical Review Letters |
| Volume | 100 |
| Issue number | 17 |
| DOIs | |
| Publication status | Published - 2008 Apr 29 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
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Origin of anomalous electronic structures of epitaxial graphene on silicon carbide. / Kim, Seungchul; Ihm, Jisoon; Choi, Hyoung Joon; Son, Young Woo.
In: Physical Review Letters, Vol. 100, No. 17, 176802, 29.04.2008.Research output: Contribution to journal › Article
TY - JOUR
T1 - Origin of anomalous electronic structures of epitaxial graphene on silicon carbide
AU - Kim, Seungchul
AU - Ihm, Jisoon
AU - Choi, Hyoung Joon
AU - Son, Young Woo
PY - 2008/4/29
Y1 - 2008/4/29
N2 - On the basis of first-principles calculations, we report that a novel interfacial atomic structure occurs between graphene and the surface of silicon carbide, destroying the Dirac point of graphene and opening a substantial energy gap there. In the calculated atomic structures, a quasiperiodic 6×6 domain pattern emerges out of a larger commensurate 63×63R30° periodic interfacial reconstruction, resolving a long standing experimental controversy on the periodicity of the interfacial superstructures. Our theoretical energy spectrum shows a gap and midgap states at the Dirac point of graphene, which are in excellent agreement with the recently observed anomalous angle-resolved photoemission spectra. Beyond solving unexplained issues in epitaxial graphene, our atomistic study may provide a way to engineer the energy gaps of graphene on substrates.
AB - On the basis of first-principles calculations, we report that a novel interfacial atomic structure occurs between graphene and the surface of silicon carbide, destroying the Dirac point of graphene and opening a substantial energy gap there. In the calculated atomic structures, a quasiperiodic 6×6 domain pattern emerges out of a larger commensurate 63×63R30° periodic interfacial reconstruction, resolving a long standing experimental controversy on the periodicity of the interfacial superstructures. Our theoretical energy spectrum shows a gap and midgap states at the Dirac point of graphene, which are in excellent agreement with the recently observed anomalous angle-resolved photoemission spectra. Beyond solving unexplained issues in epitaxial graphene, our atomistic study may provide a way to engineer the energy gaps of graphene on substrates.
UR - http://www.scopus.com/inward/record.url?scp=43049117196&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevLett.100.176802
DO - 10.1103/PhysRevLett.100.176802
M3 - Article
AN - SCOPUS:43049117196
VL - 100
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 17
M1 - 176802
ER -