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Proceedings Paper

Optical initialisation and control of carrier and nuclear spins in individual semiconductor quantum dots
Author(s): X. Marie; O. Krebs; B. Urbaszek; T. Belhadj; C.-M. Simon; A. Lemaitre; P. Voisin; T. Amand
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Paper 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.

Paper Details

Date Published: 4 September 2008
PDF: 10 pages
Proc. SPIE 7036, Spintronics, 70360I (4 September 2008); doi: 10.1117/12.795244
Show Author Affiliations
X. Marie, Univ. de Toulouse, LPCNO, INSA-CNRS-UPS (France)
O. Krebs, Lab. de Photonique et de Nanostructures, CNRS (France)
B. Urbaszek, Univ. de Toulouse, LPCNO, INSA-CNRS-UPS (France)
T. Belhadj, Univ. de Toulouse, LPCNO, INSA-CNRS-UPS (France)
C.-M. Simon, Univ. de Toulouse, LPCNO, INSA-CNRS-UPS (France)
A. Lemaitre, Lab. de Photonique et de Nanostructures, CNRS (France)
P. Voisin, Lab. de Photonique et de Nanostructures, CNRS (France)
T. Amand, Univ. de Toulouse, LPCNO, INSA-CNRS-UPS (France)


Published in SPIE Proceedings Vol. 7036:
Spintronics
Manijeh Razeghi; Henri-Jean M. Drouhin; Jean-Eric Wegrowe, Editor(s)

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