Journal
PHYSICAL REVIEW B
Volume 80, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.081310
Keywords
biexcitons; cadmium compounds; colloids; high-speed optical techniques; II-VI semiconductors; liquid semiconductors; pseudopotential methods; semiconductor quantum dots; wide band gap semiconductors
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We report on the electronic structure of the band-edge biexciton in colloidal CdSe quantum dots using femtosecond spectroscopy and atomistic many-body pseudopotential calculations. Time-resolved spectroscopy shows that optical transitions between excitonic and biexcitonic states are distinct for absorptive and emissive transitions, leading to a larger Stokes shift for the biexciton than for the single exciton. The calculations explain the experimental results by showing that there is a previously unobserved electronic substructure to the band-edge biexciton which yields two distinct families of transitions.
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