A. Reisman, M. Berkenblit, et al.
JES
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.
A. Reisman, M. Berkenblit, et al.
JES
R.M. Macfarlane, R.L. Cone
Physical Review B - CMMP
Surendra B. Anantharaman, Joachim Kohlbrecher, et al.
MRS Fall Meeting 2020
J.K. Gimzewski, T.A. Jung, et al.
Surface Science