Direct photon-phonon coupling at (001) surfaces of zinc-blende structure crystals
Por:
Pérez-Rodríguez F., Récamier J., Mochán W.L.
Publicada:
1 ene 1998
Resumen:
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. © 1998 Elsevier Science B.V. All rights reserved.
Filiaciones:
Pérez-Rodríguez F.:
Instituto de Física, Univ. Autónoma de Puebla, Apdo. Post. J-48, Puebla, Pue. 72570, Mexico
Récamier J.:
Laboratorio de Cuernavaca, Instituto de Física, Univ. Nac. Autonoma de México, Apdo. Post. 139-B, Cuernavaca, Mor. 62191, Mexico
Mochán W.L.:
Laboratorio de Cuernavaca, Instituto de Física, Univ. Nac. Autonoma de México, Apdo. Post. 139-B, Cuernavaca, Mor. 62191, Mexico
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