Dephasing of excited-state excitons in InGaAs quantum dots

Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, Muljarov, Egor A. ORCID: https://orcid.org/0000-0002-2878-4148 and Zimmermann, R. 2006. Dephasing of excited-state excitons in InGaAs quantum dots. physica status solidi (b) 243 (15) , pp. 3890-3894. 10.1002/pssb.200671516

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Abstract

We measure the dephasing time of the first optically-active excited-state excitonic transition in strongly confined InGaAs quantum dots using transient four-wave mixing. The optically-driven excited-state polarization shows a bi-exponential decay with a significant fraction of the probed excited states exhibiting a very long dephasing time, in the nanosecond range at 10 K. The full time-dependent four-wave mixing polarization is microscopically calculated by taking into account both virtual and real acoustic phonon-assisted transitions. The bi-exponential decay is qualitatively explained by a model of two-bright excitonic excited states non-degenerate in the absence of in-plane cylindrical symmetry. (© 2006 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Physics and Astronomy
Subjects:	Q Science > QB Astronomy
Publisher:	Wiley-Blackwell
ISSN:	0370-1972
Last Modified:	10 Nov 2023 12:45
URI:	https://orca.cardiff.ac.uk/id/eprint/48485

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