Abstract
The loss of translational symmetry at solid surfaces relaxes the momentum conservation constraints in photon–phonon coupling processes. We study this coupling at polar crystal surfaces and its manifestation in far-infrared reflection anisotropy spectra (RAS). We apply the Keating valence force potential to describe short-range mechanical interactions together with long-range Coulomb forces and radiation fields, and we solve analytically the ensuing system of coupled equations for the electromagnetic field and the lattice vibrations. We calculate the far-infrared normal reflectance spectra of (001) surfaces of semi-infinite zinc-blende crystals. They display a resonance structure associated with the excitation of surface and bulk phonon modes which might be observed with far-infrared RAS.
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