Dynamic characteristics of the exciton and the biexciton in a single InGaN quantum dot

S. Amloy, E. S. Moskalenko, M. Eriksson, K. F. Karlsson, Y. T. Chen, K. H. Chen, H. C. Hsu, C. L. Hsiao, L. C. Chen, P. O. Holtz

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Abstract

The dynamics of the exciton and the biexciton related emission from a single InGaN quantum dot (QD) have been measured by time-resolved microphotoluminescence spectroscopy. An exciton-biexciton pair of the same QD was identified by the combination of power dependence and polarization-resolved spectroscopy. Moreover, the spectral temperature evolution was utilized in order to distinguish the biexciton from a trion. Both the exciton and the biexciton related emission reveal mono-exponential decays corresponding to time constants of ∼900 and ∼500 ps, respectively. The obtained lifetime ratio of ∼1.8 indicates that the QD is small, with a size comparable to the exciton Bohr radius.

Original languageEnglish
Article number061910
JournalApplied Physics Letters
Volume101
Issue number6
DOIs
Publication statusPublished - 2012 Aug 6

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Amloy, S., Moskalenko, E. S., Eriksson, M., Karlsson, K. F., Chen, Y. T., Chen, K. H., Hsu, H. C., Hsiao, C. L., Chen, L. C., & Holtz, P. O. (2012). Dynamic characteristics of the exciton and the biexciton in a single InGaN quantum dot. Applied Physics Letters, 101(6), [061910]. https://doi.org/10.1063/1.4742343