Experimental results were obtained, concerning a S-Cu-related metastable complex defect, by using optical detection of magnetic resonance techniques in the X and K band. Two photoluminescence emissions which arose from bound-exciton recombination at the defect in 2 different configurations were monitored. A spin-triplet nature of the lowest bound exciton state was confirmed for both bound excitons. The symmetry of the configuration was determined to be monoclinic-I or triclinic. An unusually broad optically detected magnetic resonance line-width was suggested to originate from an unresolved hyperfine interaction with a Cu atom at the defect, where the primary bound particle (the hole) of the bound exciton was highly localized. Configurational metastability was revealed by the experiments.

W.M.Chen, M.Singh, B.Monemar, A.Henry, E.Janzén, A.M.Frens, M.T.Bennebroek, J.Schmidt: Physical Review B, 1994, 50[11], 7365-70