Dark exciton condensate in coupled quantum wells polarizes nuclei far from the excitation spot and for seconds afterward, with hyperfine coupling enhanced 100x via proposed collective sqrt(N) amplification.
Gammon et al., Electron and nuclear spin interactions in the optical spectra of single GaAs quantum dots
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Giant Hyperfine Interaction between a Dark Exciton Condensate and Nuclei
Dark exciton condensate in coupled quantum wells polarizes nuclei far from the excitation spot and for seconds afterward, with hyperfine coupling enhanced 100x via proposed collective sqrt(N) amplification.