Journal
SURFACE SCIENCE
Volume 600, Issue 14, Pages 2886-2893Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.susc.2006.05.031
Keywords
electron energy loss spectroscopy; surface optical phonon; silicon carbide
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The surface optical or Fuchs-Kliewer phonons of the (0 0 1) surface of 3C-SiC and the Si-terminated (0 0 0 1) surfaces of 4H- and 6H-SiC have been investigated with high resolution electron energy loss spectroscopy (HREELS). For each of the SiC polytypes the frequency of the surface optical phonon changes with surface reconstruction, indicating subtle differences in the static polarization at differently reconstructed surfaces. Due to their anisotropy, hexagonal surfaces exhibit a second, much weaker Fuchs-Kliewer mode. For all surfaces under examination, a linear dispersion of the Fuchs-Kliewer mode frequency has been found for wave vectors close to the Gamma-point. This dispersion can be explained by dynamical dipole coupling between atomic oscillators at the surface of the highly polar silicon carbide. (c) 2006 Elsevier B.V. All rights reserved.
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