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We describe the implementation of a separable pseudopotential into the dual space approach for ab initio density-functional calculations using Gaussian basis functions. We apply this Gaussian dual space method ~GDS/DFT! to the study of II-VI semiconductors ~II5Zn, Cd, Hg; VI5S, Se, Te, Po!. The results compare well with experimental data and demonstrate the general transferability of the separable pseudopotential. We also introduce a band-consistent tight-binding ~BC-TB! model for calculating the bulk contributions to the valence- band offsets ~VBO's !. This BC-TB approach yields good agreement with all-electron ab initio GDS/DFT results. Comparisons between BC-TB results of VBO obtained with and without p-d coupling demonstrate quantitatively the importance of d electrons and cation-d -anion-p coupling in II-VI systems. Agreement between ab initio results and experimental results is excellent.

physical review. b, condensed matter

Band structures of II-VI semiconductors using Gaussian basis functions with separable<i>ab initio</i>pseudopotentials: Application to prediction of band offsets

Band structures of II-VI semiconductors using Gaussian basis functions with separableab initiopseudopotentials: Application to prediction of band offsets