Fully optical detection of hyperfine electron–nuclear interactions in spin centers in 6h-sic crystals with a modified 13c isotope content

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