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On the basis of Kane's band model the authors apply the envelope-function method to calculate the superlattice states. Inserting these results into Kubo's formula the dynamical conductivity for interband transitions is derived. Adding the lattice contribution of the dielectric function they obtain the complex refractive index. Their results are compared with experimentally determined absorption coefficients, measured with Fourier transform spectroscopy on MBE-grown superlattices fabricated on a Riber 2300 system at the authors institute.
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Bangert et al. (1993) studied this question.
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