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

Abstract

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.

References in corpus (2)

• Excitation mechanisms of individual CdTe/ZnTe quantum dots studied by photon correlation spectroscopy
• Defect-free ZnSe nanowire and nano-needle nanostructures

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