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We experimentally demonstrate how coherent population trapping (CPT) fordonor-bound electron spins in GaAs results in autonomous feedback that preparesstabilized states for the spin polarization of nuclei around the electrons. CPTwas realized by excitation with two lasers to a bound-exciton state.Transmission studies of the spectral CPT feature on an ensemble of electronsdirectly reveal the statistical distribution of prepared nuclear spin states.Tuning the laser driving from blue to red detuned drives a transition from oneto two stable states. Our results have importance for ongoing research onschemes for dynamic nuclear spin polarization, the central spin problem andcontrol of spin coherence.

Stabilizing nuclear spins around semiconductor electrons via the interplay of optical coherent population trapping and dynamic nuclear polarization