Optical initialisation and control of carrier and nuclear spins in individual semiconductor quantum dots

X. Marie; O. Krebs; B. Urbaszek; T. Belhadj; C.-M. Simon; A. Lemaitre; P. Voisin; T. Amand

doi:10.1117/12.795244

4 September 2008 Optical initialisation and control of carrier and nuclear spins in individual semiconductor quantum dots

X. Marie, O. Krebs, B. Urbaszek, T. Belhadj, C.-M. Simon, A. Lemaitre, P. Voisin, T. Amand

Author Affiliations +

Proceedings Volume 7036, Spintronics; 70360I (2008) https://doi.org/10.1117/12.795244
Event: NanoScience + Engineering, 2008, San Diego, California, United States

Abstract

An electron spin confined to a semiconductor quantum dot is not subject to the classical spin relaxation mechanisms known for free carriers but it strongly interacts with the nuclear spin system via the hyperfine interaction. We show in time resolved photoluminescence spectroscopy experiments on ensembles of self assembled InAs quantum dots in GaAs that this interaction leads to strong electron spin dephasing. By analysing the polarization state of photons absorbed or emitted by individual dots we show how optical pumping of electron spins leads in turn to a strong nuclear polarisation that can be measured via a drastic change in the Zeeman splitting in magneto-photoluminescence experiments.

Citation Download Citation

X. Marie, O. Krebs, B. Urbaszek, T. Belhadj, C.-M. Simon, A. Lemaitre, P. Voisin, and T. Amand "Optical initialisation and control of carrier and nuclear spins in individual semiconductor quantum dots", Proc. SPIE 7036, Spintronics, 70360I (4 September 2008); https://doi.org/10.1117/12.795244

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