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.
Sallen et al., Nuclear magnetization in gallium arsenide quantum dots at zero magnetic field
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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.