Superlattices of IV-VI Compounds

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Abstract
Superlattices, multiquantum and single quantum- well structures of IV-VI compounds are of interest because of their electronic properties as narrow gap materials with a many valley band structure. In addition, also their structural properties are quite unique and they offer the possibility to investigate structural phase transitions in artificially layered structures. Experimental data on PbTe/Pb1-xGexTe are presented in this context. Electronic properties of superlattices are described within the frame work of the envelope function approximation and experimental data on interband magneto optical transitions in both geometries, namely B parallel and perpendicular to the layers, are presented. Coherent anti Stokes Raman scattering is used to obtain information on the electronic g-factors in PbTe/Pb1-xSnxTe (x = 0.175) MQW structures. The experimental data are analyzed with calculations of superlattice Landau states in both magnetic field configurations.