Observation of an unusual temperature dependence of the initial decoherence time in quantum dots

Titelangaben

Axt, Vollrath Martin ; Kuhn, Tilmann ; Vagov, Alexei ; Borri, P. ; Langbein, W. ; Woggon, U.:
Observation of an unusual temperature dependence of the initial decoherence time in quantum dots.
In: Physica Status Solidi C. Bd. 2 (2005) Heft 8 . - S. 3167-3170.
ISSN 1610-1642
DOI: https://doi.org/10.1002/pssc.200460779

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Abstract

We report on four-wave-mixing experiments in self-assembled InAs/GaAs quantum dots and compare with a theory that accounts for the pure-dephasing induced by acoustic phonons. The measurements demonstrate an unusual non-monotonous temperature dependence of the initial decoherence time in full agreement with previous theoretical predictions made on the basis of a model that concentrates on the lowest electronic states. For samples exhibiting strong electronic confinement this model even yields a good quantitative agreement with the experiments while for less confined samples there are some systematic deviations although many qualitative features are still well reproduced by the model. (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)