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

Gregory Sallen (1) , Adrien Tribu (2) , Thomas Aichele (1) , Régis André (1) , Lucien Besombes (1) , Catherine Bougerol (1) , Serge Tatarenko (1) , Kuntheak Kheng (2) , Jean-Philippe Poizat (1)

1 NEEL - NPSC - Nanophysique et Semiconducteurs
2 SP2M - UMR 9002 - Service de Physique des Matériaux et Microstructures

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.

Mots clés: Quantum dot; nanowire; photon correlation; spectroscopy; single photon

Domaines: Science des matériaux [cond-mat.mtrl-sci]

Gregory Sallen, Adrien Tribu, Thomas Aichele, Régis André, Lucien Besombes, et al.. Dark exciton optical spectroscopy of a semiconducting quantum dot embedded in a nanowire. 2009. ⟨hal-00365058⟩