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Exciton dephasing in quantum dot molecules

Borri, Paola ORCID:, Langbein, Wolfgang Werner ORCID:, 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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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: 01 Dec 2022 10:15

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