Exciton dephasing in quantum dot molecules

Borri, Paola ORCID: https://orcid.org/0000-0002-7873-3314, Langbein, Wolfgang Werner ORCID: https://orcid.org/0000-0001-9786-1023, Woggon, U., Schwab, M., Bayer, M., Fafard, S., Wasilewski, Z. and Hawrylak, P. 2003. Exciton dephasing in quantum dot molecules. Physical Review Letters (PRL) 91 (26) , 267401. 10.1103/PhysRevLett.91.267401

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Abstract

We have measured the exciton dephasing time in InAs=GaAs quantum dot molecules having different interdot barrier thicknesses in the temperature range from 5 to 60 K, using a highly sensitive four-wave mixing heterodyne technique. At 5 K dephasing times of several hundred picoseconds are found. Moreover, a systematic dependence of the dephasing dynamics on the barrier thickness is observed. These results show how the quantum-mechanical coupling of the electronic wave functions in the molecules affects both the exciton radiative lifetime and the exciton-acoustic phonon interaction.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences Physics and Astronomy
Subjects:	Q Science > QC Physics
Publisher:	American Physical Society
ISSN:	0031-9007
Last Modified:	09 May 2023 23:04
URI:	https://orca.cardiff.ac.uk/id/eprint/1543

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