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Exciton dephasing in quantum dot molecules

Borri, Paola, Langbein, Wolfgang Werner, 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 Jun 2019 22:15

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