Temperature dependence homogeneous broadening and gain recovery dynamics 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, Schneider, S., Woggon, Ulrike, Sellin, Roman, Ouyang, Donald N. and Bimberg, Dieter 2003. Temperature dependence homogeneous broadening and gain recovery dynamics in InGaAs quantum dots. Presented at: 10th International Symposium on Nanostructures: Physics and Technology, St. Petersburg, Russia, 17-21 June 2002. Published in: Alferov, Zhores I. and Esaki, Reona eds. 10th International Symposium on Nanostructures: Physics and Technology. (Proceedings of SPIE). SPIE Proceedings Series (5023) Bellingham, WA: SPIE,, pp. 334-339. 10.1117/12.514297

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Abstract

We present temperature-dependent measurements of the dephasing time in the ground-state transition of strongly-confined InGaAs quantum dots, using a highly sensitive four-wave mixing technique. At low temperature we measure a dephasing time of several hundred picoseconds. Between 7 and 100 K the polarization decay has two distinct components resulting in a non-Lorentzian lineshape with a sharp zero-phonon line and a broad band from elastic exciton-acoustic phonon interactions. We also explore the dephasing time beyond the one exciton occupation, by electrically injecting carriers. Electrical injection into the barrier region results in a dominantly pure dephasing of the excitonic ground-state transition. Once the injected carriers have filled the electronic ground state, additional filling of the excited states creates multiexcitons that show a fast dephasing due to population relaxation.

Item Type:	Conference or Workshop Item (Paper)
Date Type:	Publication
Status:	Published
Schools:	Schools > Physics and Astronomy Schools > Biosciences
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	quantum dots; III-V semiconductors; ultrafast spectroscopy; four-wave mixing; exciton-phonon; interaction
Publisher:	SPIE,
ISBN:	0819448249
Last Modified:	25 Oct 2022 09:49
URI:	https://orca.cardiff.ac.uk/id/eprint/60150

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