1998/03/23 by E. Dekel, D. Gershoni, E. Ehrenfreund +4 · 3 citations
Engineering · Materials Science · Physics and Astronomy · #Molecular Junctions and Nanostructures #Quantum Dots Synthesis And Properties #Semiconductor Quantum Structures and Devices #cond-mat.str-el
paper · pdf · doi:10.1103/physrevlett.80.4991
12 pages, 4 figures, submitted for publication on Jan,28 1998
arxiv created 1998/03/23 · openalex publication_date 1998/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We apply low temperature confocal optical microscopy to spatially resolve, and spectroscopically study, a single self-assembled quantum dot. By comparing the emission spectra obtained at various excitation levels to a theoretical many body model, we show that (a) single exciton radiative recombination is very weak, and (b) sharp spectral lines are due to optical transitions between confined multiexcitonic states among which excitons thermalize within their lifetimes. Once these few states are fully occupied, broadbands appear due to transitions between states which contain electrons in the continuum.