Abstract
We report the observation of a ${\mathrm{Ga}}_{\mathrm{i}}$ self-interstitial-related defect in Cu- and Li- codoped GaP, by optical detection of magnetic resonance. This defect has a spin triplet as its lowest electronic excited state, giving rise to a deep midgap photoluminescence band peaking at about 1.05 eV. Strong and nearly isotropic four-line-structured hyperfine splittings resolved in the magnetic resonance spectra identify the ${\mathrm{Ga}}_{1}$ self-interstitial as part of a complex defect, which has an orthorhombic symmetry. The formation of a family of defect complexes assoticated with the ${\mathrm{Ga}}_{1}$ in GaP is also discussed.
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