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Uniqueness of intraband plasmon dispersion of a single layer graphene

S.Y. Shin, C.G. Hwang, S.J. Sung, P.L. Lee, J.G. Kim, N.D. Kim, J.W. Chung
Pohang University of Science and Technology, KR

Keywords: single-layer graphene, intraband plasmon, energy-momentum dispersion


we studied the dispersion of intraband plasmon excitation of a single layer graphene(SLG) formed on 6H-SiC(0001) surface by using high-resolution electron energy loss spectroscopy. The dispersion w(q) measured from SLG appears to be quite different from that of other multilayer graphene systems reported so far but in good accord with recent theory[3]. We also discuss how to form and identify the presence of a SLG by monitoring the spectral change of Fuchs-Kliewer (FK) phonon and interband transition during the initial graphitization process on the 6H-SiC(0001) surface. We thus present the unique behavior of intraband plasmon of SLG not hampered by multilayer effects or coupling with other excitations revealing another intrinsic nature of a SLG in addition to the well-known linear Dirac band.
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