ArticleScience advances2026
Dynamic self-polarization of the nuclear spins in a GaAs quantum well.
Article in Science advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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7 authors.
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Abstract
We demonstrate the self-polarization regime of nuclear spins, originally predicted in 1972 by Dyakonov and Perel and achieved here by lattice temperature reduction into the millikelvin range. We first identify a gallium arsenide-based quantum well structure as highly suited by demonstrating a high nuclear spin polarization, corresponding to an Overhauser field of 3.1 tesla, using optical spin pumping at 1.6-kelvin lattice temperature. Here, adiabatic demagnetization leads to a nuclear spin temperature of 6.4 microkelvins, detected by time-resolved Kerr rotation. By measuring polarized photoluminescence and entering the lattice temperature regime below 500 millikelvins, a sharp zero-field feature in the Hanle electron spin depolarization curve evidences the dynamic nuclear self-polarization under unpolarized optical excitation. The self-polarization results in ultralow nuclear spin temperatures, which we estimate to become as low as 200 nanokelvins.
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