Optically detected magnetic resonance and optically detected ENDOR of shallow indium donors in ZnO

Abstract

Resolved hyperfine structure was observed in time-resolved optically detected electron-paramagnetic-resonance (ODMR) spectra obtained via a donor-acceptor emission band of ZnO. Optically detected electron-nuclear double-resonance (ENDOR) experiments showed that the structure results from hyperfine interaction with $^{115}\mathrm{In}$. The values measured for the $g$ and hyperfine tensors (${g}_{\ensuremath{\parallel}}=1.957$, ${g}_{\ensuremath{\perp}}=1.956$, $\frac{{A}_{\ensuremath{\parallel}}}{h}=100.3$ MHz, $\frac{{A}_{\ensuremath{\perp}}}{h}=100.1$ MHz) lead to attribution of the ODMR spectrum to shallow indium donors.