Giant hyperfine interaction between a dark exciton condensate and nuclei.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39151004.
- Also identified by DOI 10.1126/sciadv.ado8763 and PMC identifier 11328897.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
We study the interaction of a dark exciton Bose-Einstein condensate with the nuclei in gallium arsenide/aluminum gallium arsenide coupled quantum wells and find clear evidence for nuclear polarization buildup that accompanies the appearance of the condensate. We show that the nuclei are polarized throughout the mesa area, extending to regions that are far away from the photoexcitation area and persisting for seconds after the excitation is switched off. Photoluminescence measurements in the presence of radio frequency radiation reveal that the hyperfine interaction between the nuclear and electron spins is enhanced by two orders of magnitude. We suggest that this large enhancement manifests the collective nature of the <i>N</i>-exciton condensate, which amplifies the interaction by a factor of [Formula: see text].