Abstract
Based on the pseudopotential scheme under the virtual crystal approximation that takes into account the compositional disorder effect, the electron and positron band structures and their related properties such as effective masses, ionicity and positron affinity in the zincblende Zn 1− x Mg x S y Se 1− y quaternary system lattice matched to GaAs have been determined. The positron wave functions are obtained using the point-core approximation for the ionic potential. Our results are generally in reasonable agreement with data available from the literature. The overall dependence of the electronic and positronic studied quantities on the alloy composition x is found to be non-linear.
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