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.
Petersen et al., Large nuclear spin polarization in gate -defined quantum dots using a single-domain nanomagnet
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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.