Abstract
Quasiparticle band structure calculations which include the most important cationic core states in the $\mathrm{GW}$ 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 $\mathrm{GW}$ results in agreement with experiment.
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