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

doi:10.1103/PhysRevLett.83.2797

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

Research output: Contribution to journal › Article › peer-review

42 Citations (Scopus)

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 language	English
Pages (from-to)	2797-2800
Number of pages	4
Journal	Physical review letters
Volume	83
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevLett.83.2797
Publication status	Published - 1999 Jan 1
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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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.",

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AU - Robinson, L. M.

AU - Rho, H.

AU - Kim, J. C.

AU - Jackson, Howard E.

AU - Smith, L. M.

AU - Lee, S.

AU - Dobrowolska, M.

AU - Furdyna, J. K.

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AB - 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.

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

Abstract

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