R.J. Gambino, N.R. Stemple, et al.
Journal of Physics and Chemistry of Solids
We present a first-principles linear-response study of the phonon spectrum and dipole activity of the Si(111)2×1 surface. Our results are in good agreement with the experimental He-scattering results for the acoustic modes, as well as the electron-energy-loss data for the optical modes. We clarify a current controversy on the assignment of the electron-energy-loss peak at 56 meV. We find that the dominant contribution to the loss peak is anisotropic and arises from a longitudinal-optical vibration of the surface chains. However, a small but non-negligible isotropic contribution comes from subsurface modes polarized perpendicular to the surface. © 1991 The American Physical Society.
R.J. Gambino, N.R. Stemple, et al.
Journal of Physics and Chemistry of Solids
B.A. Hutchins, T.N. Rhodin, et al.
Surface Science
O.F. Schirmer, K.W. Blazey, et al.
Physical Review B
Peter J. Price
Surface Science