Abstract
Excitonic reflection spectra of semi-infinite crystals are calculated within Stahl's coherent wave approach to band gap dynamics. Stahl's constitutive equations are solved by an adiabatic approximation in a surface region of the thickness z0 and exactly in the bulk. The depth z0 determines a region where the repulsive surface potential plays a decisive part for the motion of electrons and holes. The method yields simple analytical expressions for the reflectivity and for the bulk polariton amplitudes both for the normal and for the oblique incidence. Calculated reflectivity curves are compared with experimental data for various semiconductors and various angles of incidence showing a fairly good agreement.
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