Manifestation of near-surface localized excitons in spectra of diffuse reflection of light

The interaction of excitons with rough surfaces and its effect on light scattering spectra were investigated theoretically. We have employed a model for the excitonic surface potential based upon the generalized Morse potential, taking into account its random fluctuations produced by the surface roughness. Applying first-order perturbation theory, we calculate the cross section of light scattering from a rough GaAs surface and analyze its frequency dependence in the presence of an extrinsic surface-potential well with excitonic bound states. Fiz. Tverd. Tela (St. Petersburg) 40, 865–866 (May 1998) Published in English in the original Russian journal. Reproduced here with stylistic changes by the Translation Editor.