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We suggest a new spin orientation mechanism for localized electrons:$dynamic~electron~spin~polarization~provided~by~nuclear~spin~fluctuations$. Theangular momentum for the electrons is gained from the nuclear spin system viathe hyperfine interaction in a weak magnetic field. For this the sample isilluminated by an unpolarized light, which directly polarizes neither theelectrons nor the nuclei. We predict, that for the electrons bound in localizedexcitons 100% spin polarization can be reached in longitudinal magnetic fieldsof a few millitesla. The proof of principle experiment is performed onmomentum-indirect excitons in (In,Al)As/AlAs quantum dots, where in a magneticfield of 17 mT the electron spin polarization of 30% is measured.

Dynamic polarization of electron spins interacting with nuclei in semiconductor nanostructures