We present the theory of surface acoustic phonon normal modes and of Brillouin scattering cross section for a shallow grating on the surface of an opaque material. The grating causes the appearing of a surface Brillouin zone and the folding of the surface modes. We study in detail the opening of gaps in the dispersion relations of the folded surface modes and resonances, for a momentum transfer up to the second zone boundary and for a grating profile beyond the simple sinusoidal approximation. The calculations are applied to the Si(001) surface. © 1993.
Dispersion relations of acoustic phonons on a corrugated surface
GIOVANNINI, Loris;NIZZOLI, Fabrizio;
1993
Abstract
We present the theory of surface acoustic phonon normal modes and of Brillouin scattering cross section for a shallow grating on the surface of an opaque material. The grating causes the appearing of a surface Brillouin zone and the folding of the surface modes. We study in detail the opening of gaps in the dispersion relations of the folded surface modes and resonances, for a momentum transfer up to the second zone boundary and for a grating profile beyond the simple sinusoidal approximation. The calculations are applied to the Si(001) surface. © 1993.File in questo prodotto:
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