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Size dependent biexciton binding energies in GaN quantum dots

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6 Author(s)
Amloy, S. ; Department of Physics, Chemistry, and Biology (IFM), Linköping University, S-58183 Linköping, Sweden ; Yu, K.H. ; Karlsson, K.F. ; Farivar, R.
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Single GaN/Al(Ga)N quantum dots (QDs) have been investigated by means of microphotoluminescence. Emission spectra related to excitons and biexcitons have been identified by excitation power dependence and polarization resolved spectroscopy. All investigated dots exhibit a strong degree of linear polarization (∼90%). The biexciton binding energy scales with the dot size. However, both positive and negative binding energies are found for the studied QDs. These results imply that careful size control of III-Nitride QDs would enable the emission of correlated photons with identical frequencies from the cascade recombination of the biexciton, with potential applications in the area of quantum information processing.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 25 )

Date of Publication:

Dec 2011

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