Luminescence spectra of coupled quantum well excitons trapped in a harmonic potential. The measurements yield data for exciton-exciton interactions, independent of the density.
From the article:
Direct Measurement of Exciton-Exciton Interaction EnergyZ. Vörös, D. W. Snoke, L. Pfeiffer, and K. West
Phys. Rev. Lett. 103, 016403 (2009)
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