Abstract
We calculate the photoluminescence spectrum and lifetime of a biexciton in a semiconductor using Fermi's golden rule. Our biexciton wave function is obtained using a quantum Monte Carlo calculation. For a recombination process where one of the excitons within the biexciton annihilates, we find that the surviving exciton is most likely to populate the ground state. We also investigate how the confinement of excitons in a quantum dot would modify the lifetime in the limit of a large quantum dot where confinement principally affects the center of mass wave function. The lifetimes we obtain are in reasonable agreement with experimental values. Our calculation can be used as a benchmark for comparison with approximate methods.
- Received 27 September 2012
DOI:https://doi.org/10.1103/PhysRevB.87.035302
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