Giant hyperfine interaction between a dark exciton condensate and nuclei

Amit Jash, Michael Stern, Subhradeep Misra, Vladimir Umansky, Israel Bar Joseph

Research output: Contribution to journalArticlepeer-review

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 N-exciton condensate, which amplifies the interaction by a factor of √N.

Original languageEnglish
Article numberado8763
JournalScience advances
Volume10
Issue number33
DOIs
StatePublished - 16 Aug 2024

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© 2024 The Authors.

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