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We investigate the optical properties of newly developed InGaAs quantum dot clusters (QDCs). The QDCs are produced using a hybrid growth method that combines droplet homoepitaxy and Stranski–Krastanov growth modes. We focus on a particular geometry, where six individual quantum dots (QDs) spontaneously form a structure morphologically similar to a benzene ring. We observe narrow exciton resonances in microphotoluminescence measurements. Temperature and excitation density dependence of the exciton resonances are investigated. Our experiments suggest that excitons are strongly confined in individual QDs instead of residing in all QDs in the cluster.
Published in:
Journal of Applied Physics
(Volume:107
,
Issue:
10
)
Date of Publication: May 2010
- Page(s):
- 104302 - 104302-4
- ISSN :
- 0021-8979
- Digital Object Identifier :
- 10.1063/1.3369389
- Product Type:
- Journals & Magazines
- Date of Current Version :
- 20 May 2010
- Issue Date :
- May 2010
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