Contribution of the buffer layer to the Raman spectrum of epitaxial graphene on SiC(0001)
We report a Raman study of the so-called buffer layer with $(6\sqrt 3\times 6\sqrt 3)R30^{\circ }$ periodicity which forms the intrinsic interface structure between epitaxial graphene and SiC(0001). We show that this interface structure leads to a non-vanishing signal in the Raman spectrum at freque...
| Main Authors: | , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2013-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/15/4/043031 |
| Summary: | We report a Raman study of the so-called buffer layer with $(6\sqrt 3\times 6\sqrt 3)R30^{\circ }$ periodicity which forms the intrinsic interface structure between epitaxial graphene and SiC(0001). We show that this interface structure leads to a non-vanishing signal in the Raman spectrum at frequencies in the range of the D- and G-band of graphene and discuss its shape and intensity. Ab initio phonon calculations reveal that these features can be attributed to the vibrational density of states of the buffer layer. |
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| ISSN: | 1367-2630 |