Quantum dot exciton dynamics through a nanoaperture: Evidence for two confined states

L. M. Robinson, H. Rho, J. C. Kim, Howard E. Jackson, L. M. Smith, S. Lee, M. Dobrowolska, J. K. Furdyna

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Abstract

Excitons confined to CdSe/ZnSe self-assembled quantum dots are probed through a nanoaperture using time-resolved photoluminescence. Significant evidence is shown that two different electronic states are associated with these dots, with binding energies which differ by an order of magnitude. The first has a short 450 ps lifetime, exhibits a relatively broad emission line, and persists nearly to room temperature; the second exhibits a long (> 4 ns) lifetime and is responsible for the sharp (˜100 μeV) lines seen at low temperatures (< 60 K). These results are completely unlike those seen in III-V dots, and reveal the complexity of the electronic structure in CdSe dots.

Original languageEnglish
Pages (from-to)2797-2800
Number of pages4
JournalPhysical review letters
Volume83
Issue number14
DOIs
Publication statusPublished - 1999 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Robinson, L. M., Rho, H., Kim, J. C., Jackson, H. E., Smith, L. M., Lee, S., Dobrowolska, M., & Furdyna, J. K. (1999). Quantum dot exciton dynamics through a nanoaperture: Evidence for two confined states. Physical review letters, 83(14), 2797-2800. https://doi.org/10.1103/PhysRevLett.83.2797