Dark exciton decay dynamics of a semiconductor quantum dot
We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a...
| Main Authors: | , , , , , , |
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| 格式: | Journal article |
| 語言: | English |
| 出版: |
2005
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| 總結: | We report measurements of the exciton decay dynamics of a single self-assembled quantum dot following non-resonant excitation. The singly charged exciton, the trion, exhibits a simple one component exponential decay corresponding to radiative recombination. Conversely, the neutral exciton exhibits a two component exponential decay. We argue that the secondary component arises from dark exciton creation and subsequent conversion to a bright exciton through a spin flip. The spin flip time is a strong function of the bias applied between a Fermi reservoir close to the dot and a Schottky gate electrode as a result of a Kondo-like spin swap process. © 2005 WILEY-VCH Verlag GmbH and Co. KGaA,. |
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