Empirical Tight-Binding Parameters for Wurtzite group III-V(non-Nitride) and IV Materials

Abstract

Many commonly used nearest neighbor tight binding models for cubic semiconductors often result in inaccurate band structures when transferred to hexagonal polytypes. The resulting bandgaps are systematically too small, and in some cases calculations may erroneously predict a metal for the wurtzite polytype. We have calculated a set of $\rm spds^*$ tight binding parameters for the hexagonal phases of non-nitride III-V and group V semiconductors fit to experimental data and empirical pseudopotential calculations. Our fitting procedure constrains the parameters to be as close as possible to those for the cubic polytype so as to make the the parameters maximally transferable. Our parameters, when combined with the existing cubic parameters, provide a model suitable for modeling the electronic structure of polytypic heterostructures containing both the wurtzite and zincblende crystal phases.