Abstract
The photoluminescence spectrum of Ge doped with the double acceptor Mg reveals lines due to both bound excitons and bound multiexciton complexes, which are in some ways similar to those previously reported for Ge:Be and Ge:Zn. As in Ge:Zn, the Ge:Mg bound exciton line was found to be a doublet, showing that the Mg double acceptor in Ge also has a split ground state. Further evidence for this ground state splitting is found from the temperature dependence of the infrared absorption spectrum of the Mg double acceptor.
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