Abstract
We report on a pulsed electron paramagnetic resonance (EPR) study of the photoexcited triplet state ($S=1$) of oxygen-vacancy centers in silicon. Rabi oscillations between the triplet sublevels are observed using coherent manipulation with a resonant microwave pulse. The Hahn echo and stimulated echo decay profiles are superimposed with strong modulations known as electron-spin-echo envelope modulation (ESEEM). The ESEEM spectra reveal a weak but anisotropic hyperfine coupling between the triplet electron spin and a ${}^{29}$Si nuclear spin ($I=1/2$) residing at a nearby lattice site, that cannot be resolved in conventional field-swept EPR spectra.
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