Fully Optical Detection of Hyperfine Electron–Nuclear Interactions in Spin Centers in 6H-SiC Crystals with a Modified 13 C Isotope Content

Optically induced alignment and polarization of electron and nuclear spins in color centers with electron spin S = 3/2 , which lead to giant changes in photoluminescence in the region of anticrossing of electron and nuclear spin levels, are observed in 13 C-enriched 6H-SiC crystals. Electron spin transitions with the flip or preservation of the projection of the nuclear spin of the 13 C isotope at the level anticrossing points in an electron–nuclear system with S = 3/2 and I = 1/2 coupled by the hyperfine interaction are identified.