In4d and Ga3d levels in InxX1-xN (X = Ga, Al) alloys.

We calculate the binding energies of the In4d and Ga3d electrons in wurtzite InxGa1-xN and InxAl1-xN alloys within the quasiparticle approach based on hybrid-functional starting points and the GW approximation. The alloys are described using a cluster approach with 256 configurations arranged in 22 cluster classes. Averaged core level positions are determined by means of a configurational average including statistical weights of the clusters. We demonstrate that even the semicore levels are influenced by the local arrangements of the cations and, hence, the average alloy composition x. Composition-dependent core level shifts are derived for the semicore levels of random alloys. [ABSTRACT FROM AUTHOR]