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- Fast exciton spin relaxation in single quantum dots doi link

Auteur(s): Favero I., Cassabois G., Voisin C., Delalande C., Roussignol P., Ferreira R., Couteau C., Poizat Jp, Gerard Jm

(Article) Publié: Physical Review B, vol. 71 p.233304 (2005)
Texte intégral en Openaccess : arxiv


Ref HAL: hal-00546623_v1
DOI: 10.1103/PhysRevB.71.233304
WoS: 000230276800016
Exporter : BibTex | endNote
43 Citations
Résumé:

Exciton spin relaxation is investigated in single epitaxially grown semiconductor quantum dots in order to test the expected spin relaxation quenching in this system. We study the polarization anisotropy of the photoluminescence signal emitted by isolated quantum dots under steady-state or pulsed nonresonant excitation. We find that the longitudinal exciton spin relaxation time is strikingly short (<= 100 ps) even at low temperature. This result breaks down the picture of a frozen exciton spin in quantum dots.