Quasiparticle Band Structure of CdS

Quasiparticle band structure calculations which include the most important cationic core states in the GW approximation of the self-energy operator are reported for a prototype II-VI semiconductor. The most salient feature of our results for cubic CdS is the finding that the complete cationic N shell needs to be included in the pseudopotential and in the self-energy in order to obtain reasonable GW results in agreement with experiment.