Related Experiment Video
Updated: Jun 16, 2025

Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
Giant hyperfine interaction between a dark exciton condensate and nuclei
Amit Jash1, Michael Stern2, Subhradeep Misra1
1Department of Condensed Matter physics, Weizmann Institute of Science, Rehovot 7610001, Israel.
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 [Formula: see text].
More Related Videos
16:20Hyperpolarized Xenon for NMR and MRI Applications
Published on: September 6, 2012
08:42High-Sensitivity Nuclear Magnetic Resonance at Giga-Pascal Pressures: A New Tool for Probing Electronic and Chemical Properties of Condensed Matter under Extreme Conditions
Published on: October 10, 2014
Related Concept Videos
NMR Spectroscopy: Spin–Spin Coupling
Atomic Nuclei: Nuclear Relaxation Processes
Atomic Nuclei: Nuclear Spin State Overview
Atomic Nuclei: Nuclear Spin State Population Distribution
Nuclear Overhauser Enhancement (NOE)
¹H NMR Signal Multiplicity: Splitting Patterns