Dark exciton optical spectroscopy of a semiconducting quantum dot embedded in a nanowire

Details Dark exciton optical spectroscopy of a semiconducting quantum dot embedded in a nanowire Dark exciton optical spectroscopy of a semiconducting quantum dot embedded in a nanowire

2009-03-03

arxiv.org/abs/0903.0497v1

Physical Review B 80, 8 (2009) 085310

Physics

Condensed Matter

Materials Science

Scientific paper

Photoluminescence of a single CdSe quantum dot embedded in a ZnSe nanowire has been investigated. It has been found that the dark exciton has a strong influence on the optical properties. The most visible influence is the strongly reduced excitonic emission compared to the biexcitonic one. Temperature dependent lifetime measurements have allowed us to measure a large splitting of $\Delta E = 6 $ meV between the dark and the bright exciton as well as the spin flip rates between these two states.

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