Optical recombination of biexcitons in semiconductors

Details Optical recombination of biexcitons in semiconductors Optical recombination of biexcitons in semiconductors

2011-02-24

arxiv.org/abs/1102.4997v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 2 figures

Scientific paper

We calculate the photoluminescence spectrum and lifetime of a biexciton in a semiconductor using Fermi's golden rule. Our biexciton wavefunction is obtained using a Quantum Monte Carlo calculation. We consider a recombination process where one of the excitons within the biexciton annihilates. For hole masses greater than or equal to the electron mass, 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 centre of mass wavefunction. The lifetimes we obtain are in reasonable agreement with experimental values. Our calculation is essentially exact and can be used as a benchmark for comparison with approximate methods.

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