THE OPTICAL-ABSORPTION COEFFICIENT OF HGTE-CDTE SUPERLATTICES - THEORY AND EXPERIMENT

On the basis of Kane's band model we 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 we obtain the complex refractive index. Our results are compared with experimentally determined absorption coefficients, measured with Fourier transform spectroscopy on MBE-grown superlattices fabricated on a Riber 2300 system at our institute.