Please use this identifier to cite or link to this item: https://doi.org/10.1103/PhysRevB.80.113410
Title: Plasmon dispersion on epitaxial graphene studied using high-resolution electron energy-loss spectroscopy
Authors: Lu, J.
Loh, K.P. 
Huang, H. 
Chen, W. 
Wee, A.T.S. 
Issue Date: 29-Sep-2009
Source: Lu, J., Loh, K.P., Huang, H., Chen, W., Wee, A.T.S. (2009-09-29). Plasmon dispersion on epitaxial graphene studied using high-resolution electron energy-loss spectroscopy. Physical Review B - Condensed Matter and Materials Physics 80 (11) : -. ScholarBank@NUS Repository. https://doi.org/10.1103/PhysRevB.80.113410
Abstract: We have investigated the momentum-space-dependent behavior of plasmons on epitaxial graphene (EG) using high-resolution electron energy-loss spectroscopy. There are significant differences in the π plasmon behavior for single, bilayer, and 3-4 layer graphene which originate from differences in the in-plane and out-of-plane modes, as well as the different band structures between single-layer and few-layer graphene. The π and σ+π surface plasmon modes in single-layer EG are recorded at 5.1 and 14.5 eV at small momentum transfer (q); these are redshifted from the values in multilayer EG. In single-layer graphene, a linear dispersion of the plasmon mode is observed, in contrast to the parabolic dispersion in multilayer EG. The overall linear π plasmon dispersion between 4.8-6.7 eV is attributed to the mixing of electronic transitions caused by local field effects, which includes the linear dispersion features resulting from transitions within the "Dirac cone." We also observe that the intensity of the Fuches-Kliewer phonon of SiC and loss continuum of EG varies with the thickness of epitaxial graphene. © 2009 The American Physical Society.
Source Title: Physical Review B - Condensed Matter and Materials Physics
URI: http://scholarbank.nus.edu.sg/handle/10635/53092
ISSN: 10980121
DOI: 10.1103/PhysRevB.80.113410
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

SCOPUSTM   
Citations

80
checked on Dec 13, 2017

WEB OF SCIENCETM
Citations

81
checked on Nov 14, 2017

Page view(s)

35
checked on Dec 9, 2017

Google ScholarTM

Check

Altmetric


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.